Silicon Laboratories Si2493 Specifications

Silicon Laboratories Si2493 Specifications
Si2493
V. 92 I SO MODEM ® WITH G L O B A L DAA
Features


This data sheet applies to Si2493
Revision D
 Data modem formats
Over
6000 V capacitive
isolation
Parallel phone detect
Globally-compliant line
interface
Overcurrent detection
ITU-T,
Bell
bps up to 56 kbps
V.21,V.22, V.29 Fast Connect
V.44, V.42, V.42bis, MNP2-5
Automatic rate negotiation
V.92 PCM upstream
V.92 Quick connect
V.92 Modem on hold
300




Type I and II caller ID decode
 No external ROM or RAM required
 UART, SPI, or parallel interface
 Flexible clock options
Low-cost
32.768 kHz oscillator
MHz oscillator
27 MHz clock input
4.915
Integrated DAA




AT command set support
SMS / MMS support
Firmware upgradeable
EEPROM interface
Lead-free, RoHS-compliant
packages
Commercial or industrial
temperature range
DTMF detection/generation
Ordering Information
This data sheet is valid only for
those chipset combinations listed
on page 51.
Pin Assignments
Si2493
(16-Pin Option)
Applications


Set-top boxes
 Point-of-sale terminals
 Text / video telephones
Digital video recorder
 Digital televisions
 Remote monitoring
Description
The Si2493 ISOmodem is a complete, ITU V.92-compliant, full-featured
modem that provides conventional data formats with connect rates of up to
56,000 bps, full-duplex, over the Public Switched Telephone Network
(PSTN). Offered as a chipset with the Si2493 system-side device and the
Si3018 line-side device, the ISOmodem utilizes Silicon Laboratories’
patented Direct Access Arrangement (DAA) technology to provide a
programmable telephone line interface with an unparalleled level of
integration. This compact solution eliminates the need for a separate DSP,
modem controller, codec, transformer, relay, opto-isolators, clocking
crystal, and 2–4 wire hybrid. Available with a system-side packaging option
of either a 16-pin SOIC or a 24-pin TSSOP, the Si2493 is ideal for
embedded modem applications due to its flexibility, small footprint, and
minimal external component count.
Host Interface
 UART
 SPI
 Parallel
Rev. 1.3 12/10
1
16
SS/RTS
XTALO
RI
VD
2
15
DCD
3
4
14
13
MISO/RXD
MOSI/TXD
SCLK/CTS
RESET
5
6
7
12
11
ESC
VA
GND
INT
10
9
C1A
C2A
Si2493
System
Side
Si3018
Line
Side
Global
DAA
BOM
Telco
Tip
Ring
8
Si2493
(24-Pin Option)
CLKIN/XTALI
1
24
SDO/EECLK/D5
XTALO
CLKOUT/EECS/A0
2
3
23
22
DCD/D4
ESC/D3
FSYNC/D6
4
21
VD3.3
GND
5
6
20
19
VD3.3
GND
VDB
VDA
7
18
SDI/EESD/D2
SS/RTS/D7
8
RI/D1
INT/DO
AOUT/INT
MOSI/TXD/WR
9
10
17
16
15
SCLK/CTS/CS
11
14
C1A
RESET
12
13
C2A
MISO/RXD/RD
Si3018
QE
DCT
System Block Diagram
Host
CPU
CLKIN/XTALI
1
RX
IB
2
3
4
C1B
C2B
VREG
5
6
7
RNG1
8
16
15
DCT2
14
13
DCT3
QB
QE2
12
11
10
9
IGND
SC
VREG2
RNG2
Capacitive
Isolation Barrier
Copyright © 2010 by Silicon Laboratories
Si2493
Si2493
2
Rev. 1.3
Si2493
TABLE O F C ONTENTS
Section
Page
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Typical Application Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3. Bill of Materials: Si2493 Chipset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.1. Host Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2. Command Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.3. Data Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.4. Fast Connect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.5. V.80 Synchronous Access Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.6. Clocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.7. Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.8. Data Compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.9. Error Correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.10. Wire Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.11. V.92 PCM Upstream . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.12. V.92 Quick Connect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.13. V.92 Modem-on-Hold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.14. Caller ID Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.15. Parallel Phone Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.16. Overcurrent Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.17. Global Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.18. Firmware Upgrades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.19. DTMF Detection / Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.20. SMS/MMS Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.21. Codec Interface (24-Pin Version Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.22. EEPROM Interface (24-Pin Version Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.23. AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.24. Extended AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5. S-Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6. User-Access Registers (U-Registers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
7. Pin Descriptions: Si2493 (16-Pin Option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
8. Pin Descriptions: Si2493 (24-Pin Option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
9. Pin Descriptions: Si3018 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
10. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
11. Package Markings (Top Markings) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
11.1. Si2493-D-FT Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
11.2. Si2493-D-FS Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
11.3. Si3018-F-FS Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
12. Package Outline: 24-Pin TSSOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
13. 24-Pin TSSOP Land Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
14. Package Outline: 16-Pin SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
15. 16-Pin SOIC Land Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Rev. 1.3
3
Si2493
1. Electrical Specifications
Table 1. Recommended Operating Conditions
Symbol
Test Condition
Min2
Typ
Max2
Unit
Ambient Temperature
TA
F-grade
G-grade
0
–40
25
25
70
85
°C
Si2493 Supply Voltage, Digital3
VD
3.0
3.3
3.6
V
Parameter1
Notes:
1. The Si2493 specifications are guaranteed when the typical application circuit (including component tolerance) and any
Si2493 and any Si3018 are used. See "2. Typical Application Schematic" on page 11.
2. All minimum and maximum specifications are guaranteed and apply across the recommended operating conditions.
Typical values apply at nominal supply voltages and an operating temperature of 25 °C unless otherwise stated.
3. The digital supply, VD, operates from 3.0 to 3.6 V.
Table 2. Loop Characteristics
(VD = 3.0 to 3.6 V, TA = 0 to 70 °C for F-grade, TA = –40 to 85 °C for G-grade)
Parameter
Symbol
DC Termination Voltage
VTR
DC Termination Voltage
VTR
DC Termination Voltage
VTR
DC Termination Voltage
VTR
DC Termination Voltage
VTR
DC Termination Voltage
VTR
DC Termination Voltage
VTR
On-Hook Leakage Current
Operating Loop Current
Operating Loop Current
DC Ring Current
ILK
ILP
ILP
Ring Detect Voltage2
Ring Detect Voltage2
Ring Frequency
Ringer Equivalence Number
VRD
VRD
FR
REN
Test Condition
ILIM1
IL = 20 mA,
=0
DCV = 00, MINI = 11, DCR = 0
IL = 120 mA, ILIM = 0
DCV = 00, MINI = 11, DCR = 0
IL = 20 mA, ILIM = 0
DCV = 11, MINI = 00, DCR = 0
IL = 120 mA, ILIM = 0
DCV = 11, MINI = 00, DCR = 0
IL = 20 mA, ILIM = 1
DCV = 11, MINI = 00, DCR = 0
IL = 60 mA, ILIM = 1
DCV = 11, MINI = 00, DCR = 0
IL = 50 mA, ILIM = 1
DCV = 11, MINI = 00, DCR = 0
VTR = –48 V
MINI = 00, ILIM = 0
MINI = 00, ILIM = 1
DC current flowing through ring
detection circuitry
RT = 0
RT = 1
Min
Typ
Max
Unit
—
—
6.0
V
9
—
—
V
—
—
7.5
V
9
—
—
V
—
—
7.5
V
40
—
—
V
—
—
40
V
—
10
10
—
—
—
—
1.5
5
120
60
3
µA
mA
mA
µA
12
18
15
—
15
21
—
—
18
25
68
0.2
VRMS
VRMS
Hz
Notes:
1. ILIM = U67, bit 9; DCV = U67, bits 3:2; MINI = U67, bits 13:12; DCR = U67, bit 7; RT = U67, bit 0.
2. The ring signal is guaranteed to not be detected below the minimum. The ring signal is guaranteed to be detected
above the maximum.
4
Rev. 1.3
Si2493
TIP
+
600 
Si3018
IL
VTR
10 µF
–
RING
Figure 1. Test Circuit for Loop Characteristics
Table 3. DC Characteristics, VD = 3.0 to 3.6 V
(VD = 3.0 to 3.6 V, TA = 0 to 70 °C for F-grade, TA = –40 to 85 °C for G-grade)
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
High Level Input Voltage
VIH
2.0
—
—
V
Low Level Input Voltage
VIL
—
—
0.8
V
High Level Output Voltage
VOH
IO = –2 mA
2.4
—
—
V
Low Level Output Voltage
VOL
IO = 2 mA
—
—
0.35
V
Input Leakage Current
IL
–10
—
10
µA
Pullup Resistance Pins
RPU
50
125
200
k
ID
—
17
35
mA
ID
—
4.4
—
mA
—
80
—
µA
Total Supply Current*
Total Supply Current, Wake-On-Ring*
Total Supply Current, Powerdown
*
ID
PDN = 1
*Note: All inputs at 0 or VD. All inputs held static except clock and all outputs unloaded (Static IOUT = 0 mA).
Rev. 1.3
5
Si2493
Table 4. AC Characteristics
(VD = 3.0 to 3.6 V, TA = 0 to 70 °C for F-grade, Fs = 8 kHz, TA = –40 to 85 °C for G-grade)
Parameter
Symbol
Sample Rate
Test Condition
Fs
Clock Input Frequency
FXTL
default
Min
Typ
Max
Unit
—
8
—
kHz
—
4.9152
—
MHz
Mode1
—
27
—
MHz
Clock Input Frequency
FXTL
27 MHz
Clock Input Frequency
FXTL
32 kHz Mode1
—
32.768
—
kHz
Receive Frequency Response
Low –3 dBFS Corner, FILT = 0
—
5
—
Hz
Receive Frequency Response
Low –3 dBFS Corner, FILT = 1
—
200
—
Hz
VFS
—
1.1
—
VPEAK
Receive Full Scale Level2,3
VFS
—
1.1
—
VPEAK
Dynamic Range4
DR
ILIM = 0, DCV = 11, MINI = 00
DCR = 0, IL = 100 mA
—
80
—
dB
Dynamic Range4
DR
ILIM = 0, DCV = 00, MINI = 11
DCR = 0, IL = 20 mA
—
80
—
dB
Dynamic Range4
DR
ILIM = 1, DCV = 11, MINI = 00
DCR = 0, IL = 50 mA
—
80
—
dB
Transmit Total Harmonic
Distortion5
THD
ILIM = 0, DCV = 11, MINI = 00
DCR = 0, IL = 100 mA
—
–72
—
dB
Transmit Total Harmonic
Distortion5
THD
ILIM = 0, DCV = 00, MINI = 11
DCR = 0, IL = 20 mA
—
–78
—
dB
Receive Total Harmonic
Distortion5
THD
ILIM = 0, DCV = 00, MINI = 11
DCR = 0, IL = 20 mA
—
–78
—
dB
Receive Total Harmonic
Distortion5
THD
ILIM = 1,DCV = 11, MINI=00
DCR = 0, IL = 50 mA
—
–78
—
dB
DRCID
VIN = 1 kHz, –13 dBm
—
50
—
dB
Transmit Full Scale
Level2
Dynamic Range (Caller ID Mode)
Notes:
1. Refer to “AN93: ISOmodem® Chipset Family Designer's Guide” for configuring clock input reset strapping.
2. Measured at TIP and RING with 600 termination at 1 kHz, as shown in Figure 1 on page 5.
3. Receive full scale level produces –0.9 dBFS at DTX.
4. DR = 20 x log |Vin| + 20 x log (rms signal/rms noise). Applies to both transmit and receive paths. Vin = 1 kHz, –3 dBFS.
5. Vin = 1 kHz, –3 dBFS. THD = 20 x log (rms distortion/rms signal).
6
Rev. 1.3
Si2493
Table 5. Absolute Maximum Ratings
Parameter
Symbol
Value
Unit
DC Supply Voltage
VD
4.1
V
Input Current, Si2493 Digital Input Pins
IIN
±10
mA
Digital Input Voltage
VIND
–0.3 to (VD + 0.3)
V
CLKIN/XTALI Input Voltage
VXIND
–0.3 to (VD + 0.3)
V
TA
–10 to 100
°C
TSTG
–40 to 150
°C
Operating Temperature Range
Storage Temperature Range
Note: Permanent device damage may occur if the above absolute maximum ratings are exceeded. Functional operation
should be restricted to the conditions as specified in the operational sections of this data sheet. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Table 6. Switching Characteristics1
(VD = 3.0 to 3.6 V, TA = 0 to 70 °C for F-grade, TA = –40 to 85 °C for G-grade)
Parameter
Symbol
Min
Typ
Max
Unit
2.048
—
49.152
MHz
tBD
–1
—
1
%
RESET to RESET
tRS
5.02
—
—
ms
RESET to 1st AT Command
tAT
300
—
—
ms
Address Setup
tAS
15
—
—
ns
Address Hold
tAH
0
—
—
ns
WR Low Pulse Width
tWL
50
—
—
ns
tWDSU
20
—
—
ns
Write Cycle Time
tWC
120
—
—
ns
Chip Select Setup
tCSS
10
—
—
ns
Chip Select Hold
tCSH
0
—
—
ns
tRL
50
—
—
ns
tRLDD
—
—
20
ns
Data Hold
tDH
10
—
—
ns
RD High to Hi-Z Time
tDZ
—
—
30
ns
UART Timing Parameters
CLKOUT Output Clock Frequency
Baud Rate Accuracy
Reset Timing Parameters
Parallel Timing Parameters
Write Data Setup Time
RD Low Pulse Width
RD Low to Data Driven Time
Notes:
1. All timing is referenced to the 50% level of the waveform. Input test levels are VIH = VD – 0.4 V, VIL = 0.4 V.
2. With 32.768 kHz clocking, allow 500 to the reset low-to-high minimum pulse on power-up and wake-from-power-down
conditions.
Rev. 1.3
7
Si2493
Table 6. Switching Characteristics1 (Continued)
(VD = 3.0 to 3.6 V, TA = 0 to 70 °C for F-grade, TA = –40 to 85 °C for G-grade)
Parameter
Symbol
Min
Typ
Max
Unit
tRC
120
—
—
ns
tWRC
120
—
—
ns
Read Cycle Time
Write to Read Cycle Time
Serial Peripheral Interface (SPI) Timing Parameters
SS Falling to First SCLK Edge
tSE
41
—
—
ns
Last SCLK Edge to SS Rising
tSD
41
—
—
ns
SS Rising to MISO High-Z
tSDZ
—
—
93
ns
SCLK High Time
tCKH
102
—
—
ns
SCLK Low Time
tCKL
102
—
—
ns
MOSI Valid to SCLK Sample Edge
tSIS
41
—
—
ns
SCLK Sample Edge to MOSI Change
tSIH
41
—
—
ns
SCLK Shift Edge to MISO Change
tSOH
—
—
93
ns
SCLK cycle time
tSCK
224
—
—
ns
tNSS_INACT
81
—
—
ns
Inactive time between SS actives
Notes:
1. All timing is referenced to the 50% level of the waveform. Input test levels are VIH = VD – 0.4 V, VIL = 0.4 V.
2. With 32.768 kHz clocking, allow 500 to the reset low-to-high minimum pulse on power-up and wake-from-power-down
conditions.
SS
T
T
SE
T
CKL
SD
SCLK*
T
CKH
T
T
SIS
SIH
MOSI
T
SEZ
T
T
SOH
SDZ
MISO
Figure 2. SPI Slave Timing
8
Rev. 1.3
Si2493
t CSS
t CSH
t AS
t AH
CS
ADDRESS = 0 or 1
A0
t RC
t RL
RD
t DZ
t RLDD
t DH
D[7:0]
VALID DATA
VALID DATA
t RLDD
Figure 3. Parallel Interface Read Timing
t CSS
t CSH
t AS
t AH
CS
A0
ADDRESS = 0 or 1
tW L
tW C
WR
t W DSU
t DH
D[7:0]
VALID DATA
VALID DATA
Figure 4. Parallel Interface Write Timing
Rev. 1.3
9
Si2493
CS
A0
ADDRESS = 0 or 1
WR
tWRC
RD
tWDSU
tDH
D[7:0]
VALID DATA
VALID DATA
tRLDD
Figure 5. Parallel Interface Write Followed by Read Timing
10
Rev. 1.3
RESET_
RXD
TXD
CTS_
8
5
6
7
16
15
14
11
3
RESET
RXD
TXD
CTS
RTS
DCD
ESC
INT
GPIO
C51
C2A
C1A
XTALO
CLKIN/XTALI
GND
12
RTS_
DCD_
ESC
INT_
GPIO
4
VD
VA
13
9
10
2
1
C41
C40
Rev. 1.3
R9
C5
C2
C1
C6
10
7
4
6
5
VREG2
VREG
IB
C2B
C1B
U2
RNG1
RNG2
QE
QE2
QB
DCT2
DCT3
DCT
RX
8
9
1
12
13
16
14
2
3
C4
R1
Q5
R2
R11
R10
C7
Q4
R4
R7
R8
R5
Q1
Z1
R3
Q2
Q3
C10
R6
+
D1
C3
-
FB1
FB2
C9
C8
R15
R16
Emissions option
TIP
RV1
RING
Refer to AN93 Appendix A for layout guidelines.
Please submit layout to Silicon Labs for review
prior to PCB fabrication.
Figure 6. Typical Si2493 Schematic with 16-pin System-Side Option
R13
R12
Y1
External crystal option
1
2
U1
IGND
C50
SC
15
+
11
VDD
Si2493
2. Typical Application Schematic
11
RESET_
RTS_/D7
RXD/RD_
TXD/WR_
CTS_/CS_
CLKOUT/EECS_/A0
INT_/D0
RI_/D1
EESD/D2
EECLK/D5
DCD_/D4
ESC/D3
AOUT/INT_
D6
12
8
9
10
11
3
16
17
18
24
23
22
15
4
5
21
RESET
RTS/D7
RXD/RD
TXD/WR
CTS/CS
C51
C53
C2A
C1A
XTALO
CLKIN/XTALI
CLKOUT/EECS/A0
INT/D0
RI/D1
EESD/D2
EECLK/D5
DCD/D4
ESC/D3
AOUT/INT
D6
U1
13
14
2
1
C41
C40
Rev. 1.3
R9
C5
Bias
C2
C1
Bypass
C6
10
7
4
6
5
VREG2
VREG
IB
C2B
C1B
U2
RNG1
RNG2
QE
QE2
QB
DCT2
DCT3
DCT
RX
8
9
1
12
13
16
14
2
3
C4
R1
Q5
R10
Ring Detect/CID
R2
R11
DC Term
C7
Q4
R4
R7
R8
R5
Q1
Z1
R3
Q2
Q3
C10
Hookswitch
R6
No Ground Plane In DAA Section
+
D1
C3
-
Figure 7. Typical Si2493 Schematic with 24-pin System-Side Option
R13
R12
Y1
External
crystal
option
1
2
VD3.3
VD 3.3
GND
GND
VDA
VDB
6
20
7
19
C52
IGND
15
C50
SC
12
+
11
VDD
FB1
FB2
C9
C8
R15
R16
Emissions option
TIP
RV1
RING
Refer to AN93 Appendix A for layout guidelines.
Please submit layout to Silicon Labs for review
prior to PCB fabrication.
Si2493
Si2493
3. Bill of Materials: Si2493 Chipset
Component
Value
Supplier(s)
C1, C2
33 pF, Y2, X7R, ±20%
Panasonic, Murata, Vishay
C3
10 nF, 250 V, X7R, ±20%
Venkel, SMEC
1.0 µF, 50 V, Elec/Tant, ±20%
Panasonic
C4
C5, C6, C50, C52
1
0.1 µF, 16 V, X7R, ±20%
Venkel, SMEC
C7
2.7 nF, 50 V, X7R, ±20%
Venkel, SMEC
C8, C9
680 pF, Y2, X7R, ±10%
Panasonic, Murata, Vishay
C10
0.01 µF, 16 V, X7R, ±20%
Venkel, SMEC
C40
C41
4.9152 MHz: 33 pF, 16 V, NPO, ±5%
32.768 kHz: 18 pF, 16 V, NPO, ±5%
27 MHz: Not Populated
1
C51, C53
D1, D2
Venkel, SMEC
2
0.22 µF, 16 V, X7R, ±20%
Venkel, SMEC
Dual Diode, 225 mA, 300 V, CMPD2004S
Central Semiconductor
FB1, FB2
Ferrite Bead, BLM21AG601SN1
Murata
Q1, Q3
NPN, 300 V, MMBTA42
OnSemi, Fairchild
Q2
PNP, 300 V, MMBTA92
OnSemi, Fairchild
Q4, Q5
NPN, 80 V, 330 mW, MMBTA06
OnSemi, Fairchild
RV1
Sidactor, 275 V, 100 A
Teccor, Protek, ST Micro
R1
1.07 k, 1/2 W, 1%
Venkel, SMEC, Panasonic
R2
150 , 1/16 W, 5%
Venkel, SMEC, Panasonic
R3
3.65 k, 1/2 W, 1%
Venkel, SMEC, Panasonic
R4
2.49 k, 1/2 W, 1%
Venkel, SMEC, Panasonic
R5, R6
100 k, 1/16 W, 5%
Venkel, SMEC, Panasonic
R7, R8
20 M, 1/16 W, 5%
Venkel, SMEC, Panasonic
R9
1 M, 1/16 W, 1%
Venkel, SMEC, Panasonic
R10
536 , 1/4 W, 1%
Venkel, SMEC, Panasonic
R11
73.2 , 1/2 W, 1%
Venkel, SMEC, Panasonic
56 , 1/16 W, 1%
Venkel, SMEC, Panasonic
R15, R16
0 , 1/16 W
Venkel, SMEC, Panasonic
U1
Si2493
Silicon Labs
U2
Si3018
Silicon Labs
R12, R13
3
32.768 kHz, 12 pF, 100 ppm, 35 k max ESR
4
Y1
4.9152 MHz, 20 pF, 100 ppm, 150  ESR
ECS Inc., Siward
27 MHz (from external clock)
Z1
Zener Diode, 43 V, 1/2 W, BZT84C43
On Semi
Notes:
1. C52 and C53 should not be populated with the Si2493 16-pin package option.
2. Several diode bridge configurations are acceptable. For example, a single DF04S or four 1N4004 diodes may be used.
3. Murata BLM21AG601SN1 may be substituted for R15–R16 (0 ) to decrease emissions.
4. To ensure compliance with ITU specifications, frequency tolerance must be less than 100 ppm including initial
accuracy, 5-year aging, 0 to 70 °C, and capacitive loading. For optimal V.92 PCM upstream performance, the
recommended crystal accuracy is ±25 ppm.
Rev. 1.3
13
Si2493
Table 7. Protocol Characteristics
14
Item
Specification
Data Rate (downstream)
56 kbps
54.666 kbps
53.333 kbps
52 kbps
50.666 kbps
49.333 kbps
48 kbps
46.666 kbps
45.333 kbps
44 kbps
42.666 kbps
41.333 kbps
40 kbps
38.666 kbps
37.333 kbps
36 kbps
34.666 kbps
33.333 kbps
32 kbps
30.666 kbps
29.333 kbps
28 kbps
ITU-T V.90
ITU-T V.90
ITU-T V.90
ITU-T V.90
ITU-T V.90
ITU-T V.90
ITU-T V.90
ITU-T V.90
ITU-T V.90
ITU-T V.90
ITU-T V.90
ITU-T V.90
ITU-T V.90
ITU-T V.90
ITU-T V.90
ITU-T V.90
ITU-T V.90
ITU-T V.90
ITU-T V.90
ITU-T V.90
ITU-T V.90
ITU-T V.90
Data Rate (upstream)
48 kbps
46.666 kbps
45.333 kbps
44 kbps
42.666 kbps
41.333 kbps
40 kbps
38.666 kbps
37.333 kbps
36 kbps
34.666 kbps
33.333 kbps
32 kbps
30.666 kbps
29.333 kbps
28 kbps
26.666 kbps
25.333 kbps
24 kbps
ITU-T V.92
ITU-T V.92
ITU-T V.92
ITU-T V.92
ITU-T V.92
ITU-T V.92
ITU-T V.92
ITU-T V.92
ITU-T V.92
ITU-T V.92
ITU-T V.92
ITU-T V.92
ITU-T V.92
ITU-T V.92
ITU-T V.92
ITU-T V.92
ITU-T V.92
ITU-T V.92
ITU-T V.92
Rev. 1.3
Si2493
Table 7. Protocol Characteristics (Continued)
Item
Specification
Data Rate
33.6 kbps
31.2 kbps
28.8 kbps
26.4 kbps
24.0 kbps
21.6 kbps
19.2 kbps
16.8 kbps
14.4 kbps
12.0 kbps
9600 bps
7200 bps
4800 bps
2400 bps
1200 bps
300 bps
300 bps
ITU-T V.34
ITU-T V.34
ITU-T V.34
ITU-T V.34
ITU-T V.34
ITU-T V.34
ITU-T V.34
ITU-T V.34
ITU-T V.34 or V.32bis
ITU-T V.34 or V.32bis
ITU-T V.34 or V.32bis
ITU-T V.34 or V.32bis
ITU-T V.34 or V.32bis
ITU-T V.34, IV.32 bis, or V.22bis
ITU-T V.22bis, V.23, or Bell 212A
ITU-T V.21
Bell 103
Data Format
Bit asynchronous
Selectable 8, 9, 10, or 11 bits per character, which includes
the start, stop, and parity bits.
Compatibility
ITU-T V.92, V.90, V.34, V.32bis, V.32, V.23, V.22bis, V.22,
V.21, Bell 212A, and Bell 103
Operating Mode
Switched network
Two-wire full duplex
Data Modulation
28 to 56 kbps (downstream)
24 to 48 kbps (upstream)
2.4 to 33.6 kbps
14.4 kbps
12.0 kbps
9600 kbps
9600 kbps
7200 kbps
4800 kbps
2400 kbps
1200 kbps
0 to 300 kbps
V.90 as specified by ITU-T
V.92 as specified by ITU-T
V.34 as specified by ITU-T
128-level TCM/2400 Baud ±0.01%
64-level TCM/2400 Baud ±0.01%
32-level TCM/2400 Baud ±0.01%
16-level QAM/2400 Baud ±0.01%
16-level TCM/2400 Baud ±0.01%
4-level QAM/2400 Baud ±0.01%
16-level QAM/600 Baud ±0.01%
4-level PSK/600 Baud ±0.01%
FSK 0–300 Baud ±0.01%
Answer Tone
ITU-T V.32bis, V.32, V.22bis, V.22, and V.21
modes
Bell 212A and 103 modes
2100 Hz ±3 Hz
2225 Hz ±3 Hz
Rev. 1.3
15
Si2493
Table 7. Protocol Characteristics (Continued)
Item
Transmit Carrier
V.92
V.90
V.34
ITU-T V.32bis
ITU-T V.32
ITU-T V.29
ITU-T V.22, V.22bis/Bell 212A
Originate mode
Answer mode
ITU-T V.21
Originate mode
Answer mode
Bell 103
Originate mode
Answer mode
Specification
As specified by ITU-T
As specified by ITU-T
As specified by ITU-T
1800 Hz ±0.01%
1800 Hz ±0.01%
1700 Hz ±1 Hz
1200 Hz ±0.5 Hz
2400 Hz ±1 Hz
Mark (980 Hz ±12 Hz) Space (1180 Hz ±12 Hz)
Mark (1650 Hz ±12 Hz) Space (1850 Hz ±12 Hz)
Mark (1070 Hz ±12 Hz) Space (1270 Hz ±12 Hz)
Mark (2025 Hz ±12 Hz) Space (2225 Hz ±12 Hz)
Output Level
Permissive—Switched network
Receive Carrier
ITU-T V.90
ITU-T V.34
ITU-T V.32bis
ITU-T V.32
ITU-T V.29
ITU-T V.22, V.22bis/Bell 212A
Originate mode
Answer mode
ITU-T V.21
Originate mode
Answer mode
Bell 103
Originate mode
Answer mode
–9 dBm maximum
As specified by ITU-T
As specified by ITU-T
1800 Hz ±7 Hz
1800 Hz ±7 Hz
1800 Hz ±7 Hz
2400 Hz ±7 Hz
1200 Hz ±7 Hz
Mark (1650 Hz ±12 Hz) Space (1850 Hz ±12 Hz)
Mark (1650 Hz ±12 Hz) Space (1850 Hz ±12 Hz)
Mark (2025 Hz ±12 Hz) Space (2225 Hz ±12 Hz)
Mark (1070 Hz ±12 Hz) Space (1270 Hz ±12 Hz)
Carrier Detect (level for ITU-T V.22bis, V.22, V.21,
212, 103) in Switched Network
Acquisition (–43 dBm)
Release (–48 dBm)
Hysteresis
2 dBm minimum
ITU-T V.90, V.34, V.32/V.32bis are echo canceling protocols that use signal quality as criteria for maintaining connection. They also provide for self-training detection to force disconnect.
16
DTE Interface
EIA/TIA-232-E (ITU-T V.24/V.28/ISO 2110)
Line Equalization
Automatic Adaptive
Connection Options
Loss of Carrier in ITU-T V.22bis and lower
Rev. 1.3
Si2493
Table 7. Protocol Characteristics (Continued)
Item
Specification
Phone Types
500 (rotary dial), 2500 (DTMF dial)
Dialing
Pulse and Tone
DTMF Output Level
Per Part 68
Pulse Dial Ratio
Make/Break: 39/61%
Ring Cadence
On 2 seconds; Off 4 seconds
Call Progress Monitor
BUSY
CONNECT (rate)
NO ANSWER
NO CARRIER
NO DIALTONE
OK
RING
RINGING
Rev. 1.3
17
Si2493
4. Functional Description
XTI
UART
Interface
Data Bus
C1
DAA
Interface
C2
Si3018/10
EEPROM
Interface
DSP
EESD
EECLK
EECS
RXD
TXD
CTS
RTS
DCD
ESC
RI
XTO
PLL
Clocking
Controller
CLKOUT
To Phone
Line
AOUT
CS
WR
RD
A0
D0-D7
Parallel
Interface
MISO
MOSI
SCLK
SS
SPI
Interface
The Si2493 allows for rapid integration into existing
modem applications by providing a serial interface that
can directly communicate to either a microcontroller via a
UART interface or a PC via an RS-232 port. This
interface allows for PC evaluation of the modem
immediately upon powerup via the AT commands using
standard terminal software.
ROM
Program Bus
This device is ideal for embedded modem applications
due to its small board space, low power consumption,
and global compliance. The Si2493 solution includes a
silicon DAA using Silicon Laboratories’ proprietary thirdgeneration DAA technology. This highly-integrated DAA
can be programmed to meet worldwide PTT
specifications for ac termination, dc termination, ringer
impedance, and ringer threshold. In addition, the Si2493
has been designed to meet the most stringent worldwide
requirements for out-of-band energy, billing-tone
immunity, surge immunity, and safety requirements.
RAM
INT
RESET
4.1. Host Interface
Figure 8. Functional Block Diagram
®
The Si2493 ISOmodem is a complete embedded
modem chipset with integrated direct access
arrangement (DAA) that provides a programmable line
interface to meet global telephone line requirements.
Available in two small packages, this solution includes a
DSP data pump, modem controller, on-chip RAM and
ROM, codec, DAA, analog output, and 27 MHz clock
input.
The Si2493 interfaces to the host processor through
either an asynchronous serial interface, a synchronous
Serial Peripheral Interface (SPI), or a parallel interface.
The default is asynchronous serial communication.
Selection of either SPI or parallel interface is done on
power-up with reset strapping. Please refer to “AN93:
ISOmodem® Chipset Family Designer's Guide” for
details.
The Si2493 accepts standard modem AT commands and
provides connect rates up to 56/33.6/14.4/2.4 kbps fullduplex over the Public Switched Telephone Network
(PSTN). The Si2493 features a complete set of modem
protocols including all ITU-T standard formats up to V.92.
4.1.1. Asynchronous Serial Interface
To provide the most flexibility, the Si2493 ISOmodem
system-side device is offered in either a 24-pin TSSOP or
a 16-pin SOIC package. The 16-pin version is footprintcompatible with the Si2401 ISOmodem and is
recommended for most applications. The 16-pin version
does not support the parallel, EEPROM or voice codec
interface. If these features are required, customers
should use the 24-pin version.
The ISOmodem provides numerous additional features
for embedded modem applications. The modem includes
full type I and type II caller ID detection and decoding for
global standards. Call progress monitoring is supported
through standard result codes. The modem is also
programmable to meet global settings. Because the
Si2493 ISOmodem integrates the DAA, analog features,
such as parallel phone detect, overcurrent detection, and
global PTT compliance with a single design, are included.
18
The
Si2493
supports
asynchronous
serial
communication with data terminal equipment (DTE) at
rates up to 307.2 kbps with the standard serial UART
format. Upon powerup, the UART baud rate is
automatically detected using the autobaud feature.
4.1.2. Serial Peripheral Interface (SPI)
The serial peripheral interface (SPI) provides a flexible,
full-duplex synchronous serial bus for host processor
and Si2493 ISOmodem communication. When the
Si2493 is powered up with SPI mode enabled the
modem becomes an SPI slave, and the pins are
configured to SS (slave select input, active low), MOSI
(serial data input to modem), MISO (serial data output
from modem) and SCLK (serial data clock input). Each
SPI operation consists of a control-and-address byte
and a data byte.
4.1.3. Parallel Interface (24-Pin Version Only)
The Si2493 can also communicate via a parallel
interface when using the 24-pin version. The parallel
interface is an 8-bit data bus with a single bit address to
memory mapped registers.
Rev. 1.3
Si2493
4.2. Command Mode
4.7. Low-Power Modes
Upon reset, the ISOmodem® is in command mode and
accepts “AT” commands. An outgoing modem call can
be made using the “ATDT#” (tone dial) or “ATDP#”
(pulse dial) command after the device is configured. If
the handshake is successful, the modem responds with
the response codes detailed in Table 12 on page 40 and
enters data mode.
The Si2493 provides multiple low power modes. Using
the S24 S-register, the Si2493 can be set to
automatically enter sleep mode after a pre-programmed
time of inactivity with either the DTE or the remote
modem. The sleep mode is entered after (S24) seconds
have passed since the last DTE activity, after the
transmit FIFO is empty, and after the last data are
received from the remote modem.
4.3. Data Mode
The Si2493 ISOmodem is in data mode while it has a
telephone line connection to another modem or is in the
process of establishing a connection.
Data protocols are available to provide error correction
to improve reliability (V.42 and MNP2-4) and data
compression to increase throughput (V.44, V.42bis and
MNP5).
Each connection between two modems in data mode
begins with a handshaking sequence. During this
sequence, the modems determine the line speed, data
protocol, and related parameters for the data link.
Configuration through AT commands determines the
range of choices available to the modem during the
negotiation process.
4.4. Fast Connect
The Si2493 supports a fast connect mode of operation
to reduce the time of a connect sequence in originate
mode. The Fast Connect modes can be enabled for
V.21, V.22, Bell103, and V.29 modulations. See AN93
for details.
4.5. V.80 Synchronous Access Mode
The Si2493 supports a V.80 synchronous access mode
of operation, which operates with an asynchronous DTE
and a synchronous DCE. See “AN93: ISOmodem®
Chipset Family Designer's Guide”.
4.6. Clocking
The Si2493 contains an on-chip phase-locked loop
(PLL) and clock generator to derive all necessary
internal system clocks from a single clock input. A
32.768 kHz or 4.9152 MHz crystal can be used across
XTALI and XTALO pins to form the master clock
(±100 ppm max, ±25 ppm recommended) for the
ISOmodem. The 32.768 kHz option can provide lower
BOM costs and smaller footprint. Alternatively, a clock
input of 27 MHz, 4.9152 MHz, or 32.768 kHz can be
provided to XTALI if that clock source is available in the
system. A 4.9152 MHz clock input is the default clock
option. Other clock options are selected at power-up
through reset strapping. Refer to AN93 for details.
Additionally, the Si2493 can be placed in wake-on-ringmode using the command, AT&Z. In either mode, the
ISOmodem remains in the sleep state until one of the
following occurs:

A 1-to-0 transition on TXD (UART mode).
 A 1-to-0 transition on SS (SPI mode).
 A 1-to-0 transition on CS (parallel mode).
 An incoming ring is detected.
 A parallel telephone is picked up.
 Line polarity reversal
The Si2493 may also be placed in a complete
powerdown mode. Once the Si2493 completely powers
down, it can only be powered back on via the RESET
pin.
4.8. Data Compression
The modem can achieve DTE (host-to-ISOmodem)
speeds greater than the maximum DCE (modem-tomodem) speed through the use of a data compression
protocol. The compression protocols available are the
ITU-T V.44, V.42bis, and MNP5 protocols. Data
compression attempts to increase throughput by
compressing the data before actually sending it. Thus,
the modem is able to transmit more data in a given
period of time.
4.9. Error Correction
The Si2493 ISOmodem can employ error correction
(reliable) protocols to ensure error-free delivery of
asynchronous data sent between the host and the
remote end. The Si2493 supports V.42 and MNP2-4
error correction protocols. V.42 (LAPM) is most
commonly used and is enabled by default.
4.10. Wire Mode
Wire mode is used to communicate with standard nonerror correcting modems. When optioned with \N3, the
Si2493 falls back to wire mode if it fails in an attempt to
negotiate a V.42 link with the remote modem. Error
correction and data compression are not active in wire
mode.
Rev. 1.3
19
Si2493
4.11. V.92 PCM Upstream
4.14. Caller ID Operation
The Si2493 supports the ITU-V.92 PCM upstream data
protocol. This protocol allows the ISOmodem to connect
at speed up to 48 kbps upstream. Previously the
upstream connection rate was limited to 33.6 kbps. The
PCM upstream mode is enabled by default; to disable,
issue the AT command +PIG = 1 (see Table 8 on
page 23). To view both downstream and upstream
connect speeds in the connect result message, issue
the command “AT \V4” or “AT+MR”.
The Si2493 supports full type I and type II caller ID
detection and decode. Caller ID is supported for the US
Bellcore, European ETSI, UK, and Japanese protocols
and is enabled via the +VCID, +VCDT, and +PCW
commands.
4.12. V.92 Quick Connect
The Si2493 supports the ITU-V.92 quick connect
protocol. Quick connect enables the modem to save
and reuse line condition parameters to reduce startup
negotiation time.
The quick connect feature is enabled by default in the
Si2493. For information on changing the quick connect
settings, see the +PSS and +PQC commands shown in
Table 8 on page 23.
4.13. V.92 Modem-on-Hold
The modem-on-hold (MOH) feature allows the modem
user to answer an incoming call while connected online
without dropping the internet connection. The modem
will remain “on hold” for a period of time determined by
the host and the ISP. There are four AT commands that
control the operation of MOH. The commands are as
follows: +PCW, +PMH, +PMHT, +PMHR. By changing
these parameters, the user can enable/disable call
waiting and MOH, set the MOH request timeout, and set
the MOH initiate timeout. For further details and syntax
on these commands see Table 8 on page 23. The MOH
feature is most useful when the Si2493 is connected to
a central office that allows call waiting.
20
4.15. Parallel Phone Detection
The ISOmodem® is able to detect when another
telephone, modem, or other device is using the phone
line. This allows the host to avoid interrupting another
phone call when the phone line is already in use and to
intelligently handle an interruption when the ISOmodem
is using the phone line.
4.15.1. On-Hook Line-in-use Detection
When the ISOmodem is sharing the telephone line with
other devices, it is important that it not interrupt a call in
progress. To detect whether another device is using the
shared telephone line, the host can use the ISOmodem
to monitor the TIP-RING dc voltage with the line voltage
sense (LVS) register (U6C, bits 15:8). The LVS bits
have a resolution of 1 V per bit with an accuracy of
approximately ±10%. Bits 0 through 6 of this 8-bit
signed twos complement number indicate the value of
the line voltage, and the sign bit (bit 7) indicates the
polarity of TIP and RING. The ISOmodem can also
monitor the TIP-RING dc voltage using the LVCS
register (U79, bits 4:0). See Figure 9 on page 21. See
also the %Vn commands for automatic line-in-use
detection.
4.15.2. Off-Hook Intrusion Detection
When the ISOmodem is off-hook, an algorithm is
implemented in the ISOmodem to automatically monitor
the TIP-RING loop current via the LVCS register. During
the off-hook state, the LVCS register switches from
representing the TIP-RING voltage to representing the
TIP-RING current. See Figure 10 on page 21. Upon
detecting an intrusion, the ISOmodem alerts the host of
the condition via the INT pin.
Rev. 1.3
Si2493
30
25
20
LVC S
BITS
15
10
5
0
0 3 6
9 12 15 18 21 24 28 30 33 36 39 42 45 47 51 54 57 60 63 66 69 72 75 78 81 84 87
100
Loop Voltage (V)
Figure 9. Loop Voltage
Overload
30
25
20
CTR21 only
LVCS
BITS
15
10
5
0
0 3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60 63 66 69 72 75 78 81 84 87 90 93
140
Loop Current
(mA)
Figure 10. Loop Current
Rev. 1.3
21
Si2493
4.16. Overcurrent Detection
4.20. SMS/MMS Support
The Si2493 includes an overcurrent detection feature
that measures the loop current at a programmable time
after the Si2493 goes off-hook. This allows the Si2493
to detect if it is connected to an improper telephone line.
The overcurrent detection feature may be enabled by
setting the OCDM bit (U70, bit 11). OHT (U77, bits 8:0)
sets the delay after off-hook until the loop current is
measured. See “AN93: ISOmodem® Chipset Family
Designer's Guide” for details.
Short Message Service (SMS) is a service that allows
text messages to be sent and received from one
telephone to another via an SMS service center.
Multimedia Messaging Service (MMS) extends the core
SMS capability to send messages that include
multimedia content. The Fax ISOmodem provides an
interface that offers a great deal of flexibility in handling
multiple SMS standards. This flexibility is possible
because most of the differences between standards are
handled by the host using the raw data itself. The
Si2493
performs
the
necessary
modulation/
demodulation of the data and provides two options for
message packet structure (Protocol 1 and Protocol 2, as
defined in ETSI ES 201 912). The rest of the data link
layer and transfer layer are defined by the host system.
The content of the message is entirely up to the host
including any checksum or CRC. ETSI ES 201 912
describes two standard data and transfer layers that are
commonly used. SMS typically relies on caller
identification information to determine if the call should
be answered using an SMS device or not.
See “6.4. SMS Support” in AN93 for more information
on how to configure the modem for SMS support.
4.17. Global Operation
The Si2493 chipset contains an integrated silicon direct
access arrangement (Silicon DAA) that provides a
programmable line interface to meet international
telephone line interface requirements. “AN93: Modem
Designer’s Guide” gives the DAA register settings
required to meet international PTT standards.
Additionally, the user-access registers (via the AT:U and
AT:R commands) may be programmed for countryspecific settings, such as dial tone, ring, ringback, and
busy tone. See AN93 for complete details.
4.18. Firmware Upgrades
The Si2493 contains an on-chip program ROM that
includes the firmware required for the features listed in
this data sheet. In addition, the Si2493 contains on-chip
program RAM to accommodate minor changes to the
ROM firmware. This allows Silicon Labs to provide
future firmware updates to optimize the characteristics
of new modem designs and those already deployed in
the field. See AN93 for complete details.
4.19. DTMF Detection / Generation
The Si2493 provides comprehensive DTMF tone
generation and detection. The ISOmodem can generate
single tones or DTMF tones using the +VTS command.
DTMF tones may also be generated during dialing using
the “ATDT” command. DTMF detection is only available
in voice mode (FCLASS = 8). DTMF digits are reported
from the modem to the host using <DLE> shielding.
4.21. Codec Interface (24-Pin Version Only)
In order to support a full range of voice and data
applications, the Si2493 includes an optional serial
interface that connects to an external voice codec
(Si3000). See AN93 for complete details.
4.22. EEPROM Interface
(24-Pin Version Only)
The Si2493 supports an optional serial peripheral
interface (SPI) bus serial EEPROM Mode 3 with a 16-bit
(8–64 kbit range) address. Upon powerup, if a pulldown
resistor 10 k is placed between D6 and GND, the
ISOmodem attempts to detect an EEPROM. The
EEPROM is intended first for setting custom defaults,
second for automatically loading firmware upgrades,
and third to allow for user-defined AT command macros
for use in custom AT commands or country codes. See
AN93 for complete details.
4.23. AT Commands
At powerup, the Si2493 is in the AT command mode. In
command mode, the modem monitors the input (serial
or parallel) checking constantly for a valid command (AT
commands are described in Table 8.)
22
Rev. 1.3
Si2493
Table 8. Basic AT Command Set (Command Defaults in Bold)
Command
Action
$
Display AT command mode settings.
A
Answer incoming call
A/
Dn
Re-execute last command. This is the only command not preceded by “AT” or followed by a
<CR>.
Dial
The dial command, followed by 1 or more dial command modifiers, manually dials a phone
number:
Modifier
Function
! or &
Flash hook switch for FHT (U4F) ms (default: 500 ms)
Pause before continuing for S8 seconds (default:
, or <
2 seconds)
;
Return to AT command mode
@
Wait for silence.
Polarity reversal detect. By placing the “G” character in
the dial string (i.e. ATDTG1), the Si2493 will monitor the
telephone line for polarity reversals. If a busy tone is
detected, the Si2493 will report “POLARITY REVERSAL” if a polarity reversal was detected or “NO POLARITY REVERSAL” if a polarity reversal was not detected.
G
In each case, the result code is followed by “OK”. If the
S7 timeout occurs before a busy tone is detected, the
Si2493 will report “NO CARRIER”. Polarity reversal
monitoring begins after the last digit is dialed and ends
when the busy tone is detected or S7 timeout occurs.
Note: It is not possible to establish a modem connection
when using this command.
L
P
T
W
En
Local DTE echo
E0
Disable
E1
Enable
Hn
Hook switch.
H0
Go on-hook (hang up modem).
Redial last number.
Pulse (rotary) dialing—pulse digits: 0, 1, 2, 3, 4, 5, 6, 7,
8, 9
Tone (DTMF) dialing—DTMF digits: *, #, A, B, C, D, 0,
1, 2, 3, 4, 5, 6, 7, 8, 9.
Wait for dial tone before continuing for S14 seconds
(default: 12 seconds). Blind dialing modes X0, X1 and
X3 do not affect the W command.
If the DOP bit (U7A, bit 7) is set, the “ATDTW” command will cause the ISOmodem® to pause dialing and
either report an “OK” if a dialtone is detected or “NO
DIALTONE” if a dial tone is not detected.
Rev. 1.3
23
Si2493
Table 8. Basic AT Command Set (Command Defaults in Bold) (Continued)
Command
H1
Go off-hook.
In
Identification and checksum.
I0
I1
Display Si2493 revision code.
B: Revision B
C: Revision C, etc.
Display Si2493 firmware revision code (numeric).
I7
Display line-side revision code.
18C = Si3018 revision C
Display the ISOmodem® model number.
“2493” = Si2493
Diagnostic results 1. See “AN93: ISOModem® Chipset Family Designer’s Guide” for details.
I8
Diagnostic results 2. See AN93 for details.
Ln
Speaker volume operation
L1
Low speaker volume
L2
Medium speaker volume
L3
High speaker volume
Mn
Speaker operation (via AOUT).
M0
Speaker is always off.
M1
Speaker is on while dialing and handshaking; off in data mode.
M2
Speaker is always on.
M3
Speaker is off while dialing, on during handshaking and retraining.
On
Return to data mode from Command mode operation.
O0
Return to data mode.
O1
Return to data mode and perform a full retrain (at any speed except 300 bps).
O2
Return to data mode and perform rate renegotiation.
Qn
Response mode.
Q0
Enable result codes (see Table 12 on page 40)
Q1
Disable result codes (enable quiet mode).
I3
I6
24
Action
R
Initiate V.23 reversal.
Sn
S-register operation (see Table 13 on page 42).
S$
List contents of all S registers.
Sn?
Display contents of S-register n.
Sn=x
Set S-register n to value x (where n and x are decimal values).
Vn
Result code type (see Table 12 on page 40).
V0
Numeric result codes.
Rev. 1.3
Si2493
Table 8. Basic AT Command Set (Command Defaults in Bold) (Continued)
Command
V1
Xn
X0
X1
Action
Verbal result codes
Call Progress Monitor (CPM)—This command controls which CPM signals are monitored
and reported to the host from the Si2493. (See Table 12 on page 40.)
Basic results; disable CPM—Blind dial (does not wait for dial tone). CONNECT message
does not include speed.
Extended results; disable CPM—Blind dial. CONNECT message includes speed.
X3
Extended results and detect dial tone only—Add dial tone detection to X1 mode. Does not
blind dial.
Extended results and detect busy only—Add busy tone detection to X1 mode.
X4
Extended results, full CPM—Full CPM enabled, CONNECT message includes speed.
X2
Y0
Extended results—Full CPM enabled including ringback detection. Adds ringback detection
to X4 mode.
Long space disconnect—Modem hangs up after 1.5 seconds or more of continuous space
while on-line.
Disable.
Y1
Enable.
X5
Yn
Z
:E
:I
:M
:P
:R
:U
Hard Reset—This command is functionally equivalent to pulsing the RESET pin low. (See
tAT in Table 6 on page 7.)
Read from serial EEPROM.
Interrupt Read—This command causes the ISOmodem® to report the lower 8 bits of the
interrupt register I/O Control 0 (U70). The CID, OCD, PPD, and RI bits also are cleared, and
the INT pin (INT bit in parallel mode) is deactivated on this read.
Write to serial EEPROM.
Program RAM Write—This command is used to upload firmware supplied by Silicon Labs to
the Si2493. The format for this command is AT:Paaaa,xxxx,yyyy,.... where aaaa is the first
address in hexadecimal and xxxx,yyyy,.... is data in hexadecimal. Only one :P command is
allowed per AT command line. No other commands can be concatenated in the :P command
line. This command is only for use with special files provided by Silicon Laboratories. Do not
attempt to use this command for any other purpose.
User-Access Register Read—This command allows the user to read from the user-access
registers (see "6. User-Access Registers (U-Registers)" on page 45). The format is “AT:Raa”,
where:
aa = user-access address in hexadecimal.
The “AT:R” command causes all the U- registers to be displayed.
User-Access Register Write—This command allows the user to write to the 16-bit useraccess registers. (See page page 45.) The format is “AT:Uaa,xxxx,yyyy,zzzz,...” where
aa = user-access address in hexadecimal.
xxxx = Data in hexadecimal to be written to location aa.
yyyy = Data in hexadecimal to be written to location (aa + 1).
zzzz = Data in hexadecimal to be written to location (aa + 2).
etc.
Rev. 1.3
25
Si2493
Table 8. Basic AT Command Set (Command Defaults in Bold) (Continued)
Command
+DR=X
+DS Options
+DS = A
+DS = A,B
+DS = A,B,C
+DS = A,B,C,D
Action
Data compression reporting.
Mode
X
0
Disabled
1
Enabled
If enabled, the intermediate result code is transmitted at the point after error control negotiation. The format of this result code is as follows:
Result code
Mode
+DR:NONE
Data compression is not in use
+DR:V42B
Rec. V.42bis is in use in both directions
+DR:V42B RD Rec. V.42bis is in use in receive direction only
+DR:V42B TD Rec. V.42bis is in use in transmit directions only
Controls V.42bis data compression function.
A
Direction
0 No compression
1 Transmit only
2 Receive only
3 Both Directions
B
Compression_negotiation
0 Do not disconnect if V.42 is not negotiated.
1 Disconnect is V.42 is not negotiated.
C
Maximum dictionary size
512
D
+DS44 Options
+DS44 = A
+DS44 = A,B
+DS44 = A,B,C
+ES Options
+ES = A
+ES = A,,C
26
Maximum string size
6 to 250 (28 default)
Controls V.44 data compression function.
A
Direction
0 No compression
1 Transmit only
2 Receive only
3 Both Directions
B
Compression_negotiation
0 Do not disconnect if V.44 is not negotiated.
1 Disconnect if Rec. V.42 is not negotiated.
C
Capability
0 Stream method
Enable synchronous access mode.
A
Specifies the mode of operation when initiating a modem connection.
D Disable synchronous assess mode.
6 Enable synchronous access mode when connection is completed and data state is
entered.
B
Specifies fallback mode of operation.
This parameter should not be used.
C
Specifies the mode of operation when answer a modem connection.
D Disable synchronous assess mode.
8 Enable synchronous access mode when connection is completed and data state is
entered.
Rev. 1.3
Si2493
Table 8. Basic AT Command Set (Command Defaults in Bold) (Continued)
Command
Action
Synchronous access mode control options
A
Specifies action taken if an underrun condition occurs during transparent sub-mode.
0 Modem transmits 8-bit SYN sequences on idle.
B
Specifies action taken if an underrun condition occurs after a flag during framed submode
0 Modem transmits 8-bit HDLC flags on idle.
C
Specifies action taken if an underrun or overrun condition occurs after a non-flag during
+ESA Options
framed sub-mode.
+ESA = A
0
Modem transmits abort on underrun in middle of frame.
+ESA = A,B
1 Modem transmits flag on underrun in middle of frame and notifies host of underrun
+ESA = A,B,C
or overrun.
+ESA = A,B,C,E
Specifies V.34 half duplex operation.
+ESA = A,B,C,E,F D
This parameter should not be used.
+ESA = A,B,C,E,F
E
Specifies
CRC polynomial used while in framed sub-mode.
,G
0 CRC generation checking disable.
1 16-bit CRC generation and checking is performed by the modem.
F
Specifies NRZI encoding and decoding.
0 NRZI encoding and decoding disabled.
G
Specifies SYN.
255
Class 1 Mode Enable for V.29 fast connect.
X
Mode
+FCLASS = X
0
Off
1
Enables support for Class 1 mode for use in the V.29 fast connect mode.
Class 1 Receive Carrier for V.29 fast connect.
X
Mode
2
Transmit V.21 (980 Hz) tone for longer than 100 ms, then send answer tone
+FRM = X
(2100/2225 Hz) for 200 ms.
95
V.29 short synchronous.
96
V.29 full synchronous.
Class 1 Transmit Carrier for V.29 fast connect.
X
Mode
2
Transmit V.21 (980 Hz) tone.
53
Same as &T4, but transmit V.29 7200 bps. Data pattern set by S40 register. AT +
FCLASS = 0 must be sent to restore the ISOmodem® to normal operation after
+FTM = X
test.
54
Same as &T4, but transmit V.29 9600 bps. Data pattern set by S40 register. AT +
FCLASS = 0 must be sent to restore the ISOmodem to normal operation after test.
95
V.29 short synchronous.
96
V.29 full synchronous.
Rev. 1.3
27
Si2493
Table 8. Basic AT Command Set (Command Defaults in Bold) (Continued)
Command
+GCI = X
Action
Country settings - Automatically configure all registers for a particular country.
X
Country
0
Japan
9
Australia
A
Austria
F
Belgium
16
Brazil
1B
Bulgaria
20
Canada
26
China
27
Columbia
2E
Czech Republic
31
Denmark
35
Ecuador
3C
Finland
3D
France
42
Germany
46
Greece
50
Hong Kong
51
Hungary
53
India
57
Ireland
58
Israel
59
Italy
61
South Korea
69
Luxembourg
6C
Malaysia
73
Mexico
7B
Netherlands
7E
New Zealand
82
Norway
87
Paraguay
89
Philippines
8A
Poland
8B
Portugal
9C
Singapore
9F
South Africa
A0
Spain
A5
Sweden
A6
Switzerland
B8
Russia
B4
United Kingdom
B5
United States
FE
Taiwan
Note: U-registers are configured to Silicon Laboratories’ recommended values. The +GCI command
resets the U-registers and the S7 and S6 S-registers to default values before setting countryspecific values. Changes may be made by writing individual registers after sending the AT+GCI
command. Refer to “AN93: ISOModem® Chipset Family Designer’s Guide” for details.
+GCI?
+GCI = ?
28
List current country code setting (response is: + GCI:<setting>)
List all possible country code settings.
Rev. 1.3
Si2493
Table 8. Basic AT Command Set (Command Defaults in Bold) (Continued)
Command
Action
Specifies the flow control to be implemented.
A
Specifies the flow control method used by the host to control data from the modem
0 None
1 Local XON/OFF flow control. Does not pass XON/XOFF character to the remote
+IFC Options
modem.
+IFC = A
2 Hardware flow control (RTS)
+IFC = A,B
B
Specifies the flow control method used by the modem to control data from the host
0 None
1 Local XON/OFF flow control.
2 Hardware flow control (CTS).
Transmit flow control threshold.
A
Threshold above which the modem will generate a flow off signal
+ITF Options
<0 to 511> bytes
+ITF = A
B
Threshold below which the modem will generate a flow on signal
+ITF = A,B
<0 to 511> bytes
+ITF = A,B,C
C
Polling interval for <EM><BNUM> indicator
0 to 300 in 10 msec units.
Modulation reporting control.
X
Mode
0
Disabled
1
Enabled
+MR = X
If enabled, the intermediate result code is transmitted at the point during connect negotiation.
The format of this result code is as follows:
+MCR: <carrier> e.g. +MCR: V32B
+MRR: <rate>
e.g. +MRR: 14400
Modulation Selection.
A
Preferred modem carrier
V21
ITU-T V.21
V22
ITU-T V.22
V22B ITU-T V.22bis
V32
ITU-T V.32
+MS Options
V32B ITU-T V.32bis
+MS = A
V34
ITU-T V.34
+MS = A,B
V90
ITU-T V.90
+MS = A,B,C
V92
ITU-T V.92
+MS = A,B,C,D
B
Automatic modulation negotiation
+MS = A,B,C,D,E
0
Disabled
+MS = A,B,C,D,E,
1
Enabled
F
C,D
Min TX rate/Max TX rate are optional numeric values that specify the lowest value
at which the DCE may establish a connection. If unspecified (set to 0), they are
determined by the carrier and automode settings.
E,F
Min RX rate/Max RX rate are optional numeric values which specify the highest
value at which the DCE may establish a connection. If unspecified (set to 0), they
are determined by the carrier and automode settings.
Rev. 1.3
29
Si2493
Table 8. Basic AT Command Set (Command Defaults in Bold) (Continued)
Command
+PCW = X
30
Action
Controls the action to be taken upon detection of call waiting.
Mode
X
0
Toggle RI and collect type II Caller ID if enabled by +VCID.
1
Hang up.
2
Ignore call waiting.
+PIG=X
Controls the use of PCM upstream in a V.92 DCE.
Mode
X
0
Enable PCM upstream.
1
Disable PCM upstream.
+PMH=X
Controls the modem-on-hold procedures.
Mode
X
0
Enables V.92 MOH.
1
Disables V.92 MOH.
+PMHF=X
V.92 MOH hook flash. This command causes the DCE to go on-hook and then return offhook. If this command is initiated and the modem is not On Hold, Error is returned.
+PMHR=X
Initiate MOH. Requests the DCE to initiate or to confirm a MOH procedure. Valid only if MOH
is enabled.
X
Mode
0
V.92 MOH request denied or not available.
1
MOH with 10 s timeout granted.
2
MOH with 20 s timeout granted.
3
MOH with 30 s timeout granted.
4
MOH with 40 s timeout granted.
5
MOH with 1 min. timeout granted.
6
MOH with 2 min. timeout granted.
7
MOH with 3 min. timeout granted.
8
MOH with 4 min. timeout granted.
9
MOH with 6 min. timeout granted.
10 MOH with 8 min. timeout granted.
11 MOH with 12 min. timeout granted.
12 MOH with 16 min. timeout granted.
13 MOH with indefinite timeout granted.
14 MOH request denied. Future request will also be denied.
Rev. 1.3
Si2493
Table 8. Basic AT Command Set (Command Defaults in Bold) (Continued)
Command
+PMHT=X
+PQC=X
+PSS=X
+VCDT = X
+VCID = X
+VCIDR?
Action
Controls access to MOH request and sets the timeout value.
X
Mode
0
Deny V.92 MOH request.
1
Grant MOH with 10 s timeout.
2
Grant MOH with 20 s timeout.
3
Grant MOH with 30 s timeout.
4
Grant MOH with 40 s timeout.
5
Grant MOH with 1 min. timeout.
6
Grant MOH with 2 min. timeout.
7
Grant MOH with 3 min. timeout.
8
Grant MOH with 4 min. timeout.
9
Grant MOH with 6 min. timeout.
10 Grant MOH with 8 min. timeout.
11 Grant MOH with 12 min. timeout.
12 Grant MOH with 16 min. timeout.
13 Grant MOH with indefinite timeout.
V.92 Phase 1 and Phase 2 Control.
X
Mode
0
Enable Short Phase 1 and Short Phase 2.
1
Enable Short Phase 1.
2
Enable Short Phase 2.
3
Disable Short Phase 1 and Short Phase 2.
Selection of full or short startup procedures.
X
Mode
0
The DCEs decide to use short startup procedures.
1
Forces the use of short startup procedures on next and subsequent connections.
2
Forces the use of full startup procedures on next and subsequent connections.
Caller ID Type.
X
Mode
0
After ring only
1
Always on (Recommended Setting)
2
UK
3
Japan
Caller ID Enable.
X
Mode
0
Off
1
On—formatted
2
On—raw data format
Type II caller ID information — The Si2493 will display “+VCDIR:” followed by raw caller ID
information including checksum.
Rev. 1.3
31
Si2493
4.24. Extended AT Commands
The extended AT commands are supported by the Si2493 and are described in Tables 9 through 11.
Table 9. Extended AT& Command Set (Command Defaults in Bold)
Command
&$
Display AT& current settings.
&D0
ESC is not used
&D1
ESC escapes to command mode from data mode if also enabled by HES U70, bit 15.
&D2
ESC assertion during a modem connection causes the modem to go on-hook and return to command mode.
&D3
ESC assertion causes ATZ command (reset and return OK result code).
&F
32
Action
Restore factory default settings.
&Gn
Line connection rate limit—This command sets an upper limit on the line speed that the Si2493 can
connect. Note that the &Hn commands may limit the line speed as well (&Gn not used for &H0 or
&H1). Not all modulations support rates given by &G. Any improper setting will be ignored.
&G3
1200 bps max
&G4
2400 bps max
&G5
4.8 kbps max
&G6
7.2 kbps max
&G7
9.6 kbps max
&G8
12 kbps max
&G9
14.4 kbps max
&G10
16.8 kbps max
&G11
19.2 kbps max
&G12
21.6 kbps max
&G13
24 kbps max
&G14
26.4 kbps max
&G15
28.8 kbps max
&G16
31.2 kbps max
&G17
33.6 kbps max
&Hn
Switched network handshake mode—&Hn commands must be on a separate command line from
ATD, ATA, or ATO commands.
&H0
V.90 with automatic fallback (56 kbps to 300 bps)
&H1
V.90 only (56 kbps to 28 kbps)
Rev. 1.3
Si2493
Table 9. Extended AT& Command Set (Command Defaults in Bold) (Continued)
Command
Action
&H2
V.34 with automatic fallback (33.6 kbps to 300 bps)
&H3
V.34 only (33.6 kbps to 2400 bps)
&H4
ITU-T V.32bis with automatic fallback (14.4 kbps to 300 bps)
&H5
ITU-T V.32bis only (14.4 kbps to 4800 bps)
&H6
ITU-T V.22bis only (2400 bps or 1200 bps)
&H7
ITU-T V.22 only (1200 bps)
&H8
Bell 212 only (1200 bps)
&H9
Bell 103 only (300 bps)
&H10
ITU-T V.21 only (300 bps)
&H11
V.23 (1200/75 bps)
&H12
V.92 with automatic fallback
&Pn
Japan pulse dialing
&P0
Configure Si2493 for 10 pulse-per-second pulse dialing. For Japan.
&P1
Configure Si2493 for 20 pulse-per-second pulse dialing. For Japan.
&Tn
Test mode
&T0
Cancel test mode (Escape to command mode to issue AT&T0). This command will also report the
number of bit errors encountered on the previous &T4 or &T5 test.
&T2
Initiate ITU-T V.54 (ANALOOP) test. Modulation set by &H AT command. Test loop is through the
DSP (Si2493 device) only. ISOmodem® echoes data from TX pin (Register 0 in parallel mode) back
to RX pin (Register 0 in parallel mode).
&T3
Initiate ITU-T V.54 (ANALOOP) test. Modulation set by &H AT command. Test loop is through the
DSP (Si2493), DAA interface section (Si2493), DAA interface (Si3018), and analog hybrid circuit
(Si3018). ISOmodem echoes data from TX pin (Register 0 in parallel mode) back to RX pin (Register 0 in parallel mode). Phone line termination required as in Figure 1. To test only the link operation,
the hybrid and AFE codec can be removed from the test loop by setting the DL bit (U62, bit 1).
&T4
Initiate transmit as originating modem with automatic data generation. Modulation, data rate, and
symbol rate are set by &H, &G, and S41. Data pattern is set by the S40 register. Continues until the
ATH command is sent after an escape into command mode. Data is also demodulated as in
ANALOOP, and any bit errors are counted to be displayed after the test using &T0.
&T5
Initiate transmit as answering modem with automatic data generation. Modulation, data rate, and
symbol rate are set by &H, &G, and S41. Data pattern is set by the S40 register. Continues until the
ATH command is sent after an escape into command mode. Data is also demodulated as in
ANALOOP, and any bit errors are counted to be displayed after the test using &T0.
&T6
Compute checksum for firmware-upgradeable section of program memory. If no firmware upgrade is
installed, &T6 returns 0x4474.
&Xn
Automatic determination of telephone line type.
Rev. 1.3
33
Si2493
Table 9. Extended AT& Command Set (Command Defaults in Bold) (Continued)
Command
&X0
&X1
Action
Abort &x1 or &x2 command.
Automatic determination of telephone line type.
Result code: WXYZn
W:
0 = line supports DTMF dialing.
1 = line is pulse dial only.
X:
0 = line supports 20 pps dialing.
1 = line supports 10 pps dialing only.
Y:
0 = extension network present (PBX).
1 = outside line (PSTN) connected directly.
Z:
0 = continuous dialtone.
1 = make-break dialtone.
n:
0–9 (number required for outside line if Y = 0).
Note: The initial number attempted for an outside line is controlled in S51.
&X2
*Y2A
&Z
34
Same as &X1, but Y result (PBX) is not tested.
Produce a constant answer tone (ITU-T) and return to command mode. The answer tone continues
until the ATH command is received or the S7 timer expires.
Enter low-power wake-on-ring mode.
Rev. 1.3
Si2493
Table 10. Extended AT% Command Set (Command Defaults in Bold)
Command
Action
%$
Display AT% command settings.
%B
Report blacklist. See also S42 register.
%Cn
Data compression
%C0
Disable V.42bis and MNP5 data compression
%C1
Enable V.42bis in transmit and receive paths. If MNP is selected (\N2), then %C1 enables
MNP5 in transmit and receive paths.
%C2
Enable V.42bis in transmit path only.
%C3
Enable V.42bis in receive path only.
%On
Answer mode.
%O1
Si2493 will auto-answer a call in answer mode.
%O2
Si2493 will auto-answer a call in originate mode.
%Vn
Automatic Line Status Detection.
After the %V1 and %V2 commands are issued, the Si2493 will automatically check the telephone
connection for whether or not a line is present. If a line is present, the Si2493 will automatically
check if the line is already in use. Finally, the Si2493 will check line status both before going off-hook
and again before dialing. %V1 uses the fixed method, and %V2 uses the adaptive method. %V0
(default) disables this feature.
%V0
Disable automatic line-in-use detection.
%V1
Automatic Line Status Detection—Fixed Method.
Description: Before going off-hook with the ATD, ATO, or ATA commands, the Si2493 compares the
line voltage (via LVCS) to registers NOLN (U83) and LIUS (U84):
Loop Voltage
0  LVCS  NOLN
NOLN  LVCS  LIUS
LIUS  LCVS
Action
Report “NO LINE” and remain on-hook.
Report “LINE IN USE” and remain on-hook.
Go off-hook and establish a modem connection.
Once the call has begun, the off-hook intrusion algorithm (described in "4.15.2. Off-Hook Intrusion
Detection" on page 20) operates normally. In addition, the Si2493 will report “NO LINE” if the telephone line is completely disconnected. If the HOI bit (U77, bit 11) is set, “LINE IN USE” is reported
upon intrusion.
Rev. 1.3
35
Si2493
Table 10. Extended AT% Command Set (Command Defaults in Bold) (Continued)
Command
Action
%V2
Automatic Line Status Detection—Adaptive Method.
Description: Before going off-hook with the ATD, ATO, or ATA commands, the Si2493 compares the
line voltage (via LVCS) to the NLIU (U85) register:
Loop Voltage
Action
0  LVCS  (0.0625 x NLIU)
Report “NO LINE” and remain on-hook.
(0.0625 x NLIU) < LVCS  (0.85 x NLIU) Report “LINE IN USE” and remain on-hook.
(0.85 x NLIU) < LCVS
Go off-hook and establish a modem connection.
The NLIU register is updated every 1 ms with the minimum non-zero value of LVCS in the last
30 ms. This allows the Si2493 to eliminate errors due to 50/60 Hz interference and also adapt to relatively slow change in the on-hook dc reference value on the telephone line. This algorithm does not
allow any non-zero values for NLIU below 0x0007. The host may also initialize NLIU prior to issuing
the %V2 command. Once the call has begun, the off-hook intrusion algorithm (described in "4.15.2.
Off-Hook Intrusion Detection" on page 20) operates normally. In addition, the Si2493 will report “NO
LINE” if the telephone line is completely disconnected. If the HOI (U77, bit 11) bit is set, “LINE IN
USE” is reported upon intrusion.
36
Rev. 1.3
Si2493
Table 11. Extended AT\ Command Set (Command Defaults in Bold)
Command
\$
Action
Display AT\ command settings.
\Bn
Character length will be automatically set in autobaud mode
\B0
6N1—six data bits, no parity, one stop bit, one start bit, eight bits total (\N0 only)1
\B1
7N1—seven data bits, no parity, one stop bit, one start bit, nine bits total (\N0 only)1
\B2
7P1—seven data bits, parity optioned by \P, one stop bit, one start bit, 10 bits total
\B3
8N1—eight data bits, no parity, one stop bit, one start bit, 10 bits total
\B5
8P1—eight data bits, parity optioned by \P, one stop bit, one start bit, 11 bits total (\N0 only)
\B6
8X1—eight data bits, one escape bit, one stop bit, one start bit, 11 bits total (enables ninth-bit
escape mode)
\Nn
Asynchronous protocol
\N0
Wire mode (no error correction, no compression)
\N2
MNP reliable mode. The Si2493 attempts to connect with the MNP protocol. If unsuccessful, the call
is dropped.
\N3
V.42 auto-reliable—The Si2493 attempts to connect with the V.42 protocol. If unsuccessful,
the MNP protocol is attempted. If unsuccessful, wire mode is attempted.
\N4
V.42 (LAPM) reliable mode (or drop call)—Same as \N3 except that the Si2493 drops the call
instead of connecting in MNP or wire mode.
\N5
V.42 and MNP reliable mode—The Si2493 attempts to connect with V.42. If unsuccessful, MNP is
attempted. If MNP us unsuccessful, the call is dropped.
\Pn
Parity type will be automatically set in autobaud mode
\P0
Even
\P1
Space1
\P2
Odd
\P3
Mark1
\Qn
Modem-to-DTE flow control
\Q0
Disable all flow control—This may only be used if the DTE speed and the VF speed are guaranteed
to match throughout the call.
\Q2
Use CTS only
Notes:
1. When in autobaud mode, \B0, \B1, and \P1 will not be detected automatically. The combination of \B2 and \P3 will be
detected. This is compatible with seven data bits, no parity, two stop bits. Seven data bits, no parity, one stop bit may be
forced by sending AT\T17\B1.
2. The autobaud feature does not detect this rate.
3. Default is \T9 if a pulldown resistor is connected to the autobaud strap pin; otherwise, the default is \T16.
Rev. 1.3
37
Si2493
Table 11. Extended AT\ Command Set (Command Defaults in Bold) (Continued)
Command
Action
\Q3
Use RTS/CTS
\Q4
Use XON/XOFF flow control for modem-to-DTE interface. Does not enable modem-to-modem flow
control.
\Tn
DTE rate—Change DTE rate. When the Si2493 is configured in autobaud mode (default), \T0
through \T15 will lock the new baud rate and disable autobaud. When the ISOmodem® is not in
autobaud mode (the autobaud strap pin low on powerup), the result code “OK” is sent at the old DTE
rate. Subsequent commands must be sent at the new rate.
\T0
300 bps
\T1
600 bps
\T2
1200 bps
\T3
2400 bps
\T4
4800 bps
\T5
7200 bps
\T6
9600 bps
\T7
12.0 kbps2
\T8
14.4 kbps
\T9
19.2 kbps3
\T10
38.4 kbps
\T11
57.6 kbps
\T12
115.2 kbps
\T13
230.4 kbps
\T14
245.760 kbps2
\T15
307.200 kbps
\T16
Autobaud on3
\T17
Autobaud off; lock at current baud rate.
Notes:
1. When in autobaud mode, \B0, \B1, and \P1 will not be detected automatically. The combination of \B2 and \P3 will be
detected. This is compatible with seven data bits, no parity, two stop bits. Seven data bits, no parity, one stop bit may be
forced by sending AT\T17\B1.
2. The autobaud feature does not detect this rate.
3. Default is \T9 if a pulldown resistor is connected to the autobaud strap pin; otherwise, the default is \T16.
38
Rev. 1.3
Si2493
Table 11. Extended AT\ Command Set (Command Defaults in Bold) (Continued)
Command
Action
\U
Serial mode—causes a low pulse (25 ms) on RI and DCD. INT to be the inverse of ESC. RTS to be
inverse of CTS.
Parallel mode—causes a low pulse (25 ms) on INT.
This command terminates with a RESET.
\Vn
Connect message type
\V0
Report connect message and protocol message
\V2
Report connect message only (exclude protocol message)
\V4
Report connect and protocol message with both upstream and downstream connect rates.
Notes:
1. When in autobaud mode, \B0, \B1, and \P1 will not be detected automatically. The combination of \B2 and \P3 will be
detected. This is compatible with seven data bits, no parity, two stop bits. Seven data bits, no parity, one stop bit may be
forced by sending AT\T17\B1.
2. The autobaud feature does not detect this rate.
3. Default is \T9 if a pulldown resistor is connected to the autobaud strap pin; otherwise, the default is \T16.
Rev. 1.3
39
Si2493
Table 12. Result Codes
Numeric
Meaning
Verbal Response
X0
X1
X2
X3
X4
X5
0
Command was successful
OK
X
X
X
X
X
X
1
Link established at 300 bps
or higher
CONNECT
X
X
X
X
X
X
2
Incoming ring detected
RING
X
X
X
X
X
X
3
Link dropped
NO CARRIER
X
X
X
X
X
X
4
Command failed
ERROR
X
X
X
X
X
X
5
Link establish at 1200
CONNECT 1200
X
X
X
6
Dial tone not present
NO DIALTONE
7
Line busy
BUSY
8
Remote not answering
NO ANSWER
X
X
X
X
X
X
X
X
X
X
X
X
X
X
9
Ringback detected
RINGING
10
Link established at 2400
CONNECT 2400
X
X
X
X
X
X
11
Link established at 4800
CONNECT 4800
X
X
X
X
X
12
Link established at 9600
CONNECT 9600
X
X
X
X
X
14
Link established at 19200
CONNECT 19200
X
X
X
X
X
15
Link established at 7200
CONNECT 7200
X
X
X
X
X
16
Link established at 12000
CONNECT 12000
X
X
X
X
X
17
Link established at 14400
CONNECT 14400
X
X
X
X
X
18
Link established at 16800
CONNECT 16800
X
X
X
X
X
19
Link established at 21600
CONNECT 21600
X
X
X
X
X
20
Link established at 24000
CONNECT 24000
X
X
X
X
X
21
Link established at 26400
CONNECT 26400
X
X
X
X
X
22
Link established at 28800
CONNECT 28800
X
X
X
X
X
23
Link established at 31200
CONNECT 31200
X
X
X
X
X
24
Link established at 33600
CONNECT 33600
X
X
X
X
X
30
Caller ID mark detected
CIDM
X
X
X
X
X
X
31
Hookswitch flash detected
FLASH
X
X
X
X
X
X
32
UK CID State Tone Alert
Signal detected
STAS
X
X
X
X
X
X
33
Overcurrent condition
X*
X
X
X
X
X
X
40
Blacklist is full
BLACKLIST FULL (enabled
via S42 register)
X
X
X
X
X
X
41
Attempted number is blacklisted.
BLACKLISTED (enabled via
S42 register)
X
X
X
X
X
X
42
No phone line present
NO LINE (enabled via %Vn
commands)
X
X
X
X
X
X
43
Telephone line is in use
LINE IN USE (enabled via
%Vn commands)
X
X
X
X
X
X
44
A polarity reversal was
detected
POLARITY REVERSAL
(enabled via G modifier)
X
X
X
X
X
X
*Note: X is the only verbal response code that does not follow the <CR><LF>Result Code<CR><LF> standard. There is no
leading <CR><LF>.
40
Rev. 1.3
Si2493
Table 12. Result Codes (Continued)
Numeric
Meaning
Verbal Response
X0
X1
X2
X3
X4
X5
X
X
X
X
X
X
45
A polarity reversal was NOT NO POLARITY REVERSAL
detected
(enabled via G modifier)
52
Link established at 56000
CONNECT 56000
X
X
X
X
X
60
Link established at 32000
CONNECT 32000
X
X
X
X
X
61
Link established at 48000
CONNECT 48000
X
X
X
X
X
63
Link established at 28000
CONNECT 28000
X
X
X
X
X
64
Link established at 29333
CONNECT 29333
X
X
X
X
X
65
Link established at 30666
CONNECT 30666
X
X
X
X
X
66
Link established at 33333
CONNECT 33333
X
X
X
X
X
67
Link established at 34666
CONNECT 34666
X
X
X
X
X
68
Link established at 36000
CONNECT 36000
X
X
X
X
X
69
Link established at 37333
CONNECT 37333
X
X
X
X
X
70
No protocol
PROTOCOL: NONE
Set with \V0 command.
75
Link established at 75
CONNECT 75
X
77
V.42 protocol
PROTOCOL: V42
Set with \V0 command.
79
V.42bis protocol
PROTOCOL: V42bis
Set with \V0 command.
80
MNP2 protocol
PROTOCOL:
ALTERNATE, + CLASS 2
Set with \V command.
81
MNP3 protocol
PROTOCOL:
ALTERNATE, + CLASS 3
Set with \V command.
82
MNP4 protocol
PROTOCOL:
ALTERNATE, + CLASS 4
Set with \V command.
83
MNP5 protocol
PROTOCOL:
ALTERNATE, + CLASS 5
X
X
X
X
X
90
Link established at 38666
CONNECT 38666
X
X
X
X
X
91
Link established at 40000
CONNECT 40000
X
X
X
X
X
92
Link established at 41333
CONNECT 41333
X
X
X
X
X
93
Link established at 42666
CONNECT 42666
X
X
X
X
X
94
Link established at 44000
CONNECT 44000
X
X
X
X
X
95
Link established at 45333
CONNECT 45333
X
X
X
X
X
96
Link established at 46666
CONNECT 46666
X
X
X
X
X
97
Link established at 49333
CONNECT 49333
X
X
X
X
X
98
Link established at 50666
CONNECT 50666
X
X
X
X
X
99
Link established at 52000
CONNECT 52000
X
X
X
X
X
100
Link established at 53333
CONNECT 53333
X
X
X
X
X
101
Link established at 54666
CONNECT 54666
X
X
X
X
X
102
DTMF dial attempted on a
pulse dial only line
UN–OBTAINABLE NUMBER
X
X
X
X
X
X
X
X
X
X
*Note: X is the only verbal response code that does not follow the <CR><LF>Result Code<CR><LF> standard. There is no
leading <CR><LF>.
Rev. 1.3
41
Si2493
5. S-Registers
The S command allows reading (Sn?) or writing (Sn = x) the S-registers. The S-registers store values for functions
that typically are rarely changed, such as timers or counters, and the ASCII values of control characters, such as
carriage return. Table 13 summarizes the S-register set.
Table 13. S-Register Description
Definition
S-Register
(Decimal)
Function
Default
(Decimal)
Range
Units
0
Automatic answer—Number of rings the Si2493 must
detect before answering a call. 0 disables auto answer.
0
0–255
Rings
1
Ring counter.
0
0–255
Rings
2
ESC code character.
43 (+)
0–255
ASCII
3
Carriage return character.
13 (CR)
0–255
ASCII
4
Linefeed character.
10 (LF)
0–255
ASCII
5
Backspace character.
08 (BS)
0–255
ASCII
6
Dial tone wait timer—Number of seconds the Si2493
waits before blind dialing. Only applicable if blind dialing is enabled (X0, X1, X3).
02
0–255
seconds
7
Carrier wait timer—Number of seconds the Si2493
waits for carrier before timing out. This register also
sets the number of seconds the modem waits for ringback when originating a call before hanging up. This
register also sets the number of seconds the answer
tone will continue while using the AT Y2A command.
80
0–255
seconds
8
Dial pause timer for , and < dial command modifiers.
02
0–255
seconds
9
Carrier presence timer—Time after a loss of carrier
that a carrier must be detected before reactivating
DCD. S9 is referred to as “carrier loss debounce time.”
06
1–255
0.1 second
10
Carrier loss timer—Time the carrier must be lost before
the Si2493 disconnects. Setting 255 disables disconnect entirely. If S10 is less than S9, even a momentary
loss of carrier causes a disconnect.
14
1–255
0.1 second
12
Escape code guard timer—Minimum guard time
required before and after “+++” for the Si2493 to recognize a valid escape sequence.
50
1–255
0.02 second
14
Wait for dial tone delay value (in relation to the W dial
modifier). Starts when “W” is executed in the dial
string.
12
0–255
seconds
*
42
Rev. 1.3
Si2493
Table 13. S-Register Description (Continued)
Definition
S-Register
(Decimal)
Function
Default
(Decimal)
Range
Units
24
Sleep Inactivity Time—Sets the time that the modem
operates in normal power mode with no activity on the
serial port, parallel port, or telephone line before entering low-power sleep mode. This feature is disabled if
the timer is set to 0.
0
0–255
seconds
30
Disconnect Activity Timer—Sets the length of time that
the modem stays online before disconnecting with no
activity on the serial port, parallel port, or telephone
line (Ring, hookswitch flash, or caller ID). This feature
is disabled if set to 0.
0
0–255
minutes
38
Hang Up Delay Time—Maximum delay between
receipt of ATH0 command and hang up. If time out
occurs before all data can be sent, the NO CARRIER
(3) result code is sent (operates in V.42 mode only).
“OK” response is sent if all data is transmitted before
timeout. S38 = 255 disables timeout and modem disconnects only if data is successfully sent or carrier is
lost.
20
0–255
seconds
40
Data Pattern—Data pattern generated during &T4 and
&T5 transmit tests.
0 = All spaces (0s)
1 = All marks (1s)
2 = Random data
0
0–2
41
V.34 symbol rate - Symbol rate for V.34 when using the
&T4 and &T5 commands.
0 = 2400
symbols/second
1 = 2743
symbols/second
2 = 2800
symbols/second
3 = 3000
symbols/second
4 = 3200
symbols/second
5 = 3429
symbols/second
A valid combination of symbol rate (S41) and data rate
(&G) must be selected.
Symbol Rate Allowable Data Rates
2400
2400–21600
2743
4800–26400
2800
4800–26400
3000
4800–28800
3200
4800–31200
3429
4800–33600
0
0–5
Rev. 1.3
43
Si2493
Table 13. S-Register Description (Continued)
Definition
S-Register
(Decimal)
Function
Default
(Decimal)
Range
42
Blacklisting—The Si2493 will not dial the same number
more than two times in three minutes. An attempt to
dial a third time within three minutes will result in a
“BLACKLISTED” result code. If the blacklist memory is
full, any dial to a new number will result in a “BLACKLIST FULL” result code. Numbers are added to the
blacklist only if the modem connection fails. The %B
command will list the numbers on the blacklists.
0 = disabled
1 = enabled
0 (disabled)
0–1
43
Dial Attempts to Blacklist.
When blacklisting is enabled with S42, this value controls the number of dial attempts that will result in a
number being blacklisted.
4
0–4
—
44
Blacklist Timer.
Period during which blacklisting is active.
180
0–255
seconds
50
Minimum on-hook time—Modem will remain on-hook
for S50 seconds. Any attempt to go off-hook will be
delayed until this timer expires.
3
0–255
seconds
51
Number to start checking for an outside line on a PBX.
See &X command for details.
1
0–9
—
44
Rev. 1.3
Units
Si2493
6. User-Access Registers
(U-Registers)
U-Registers are 16-bit registers written by the AT:Uaa
command and read by the AT:R (read all U-Registers)
or AT:Raa (read U-Register aa) commands (see the AT
command list in Table 11 on page 37). Many aspects of
the modem’s and DAA’s behavior can be enabled/
disabled, configured, monitored, and/or modified
through U-Registers; however, most of them will not be
needed in normal use.
There are two types of U-Registers. The first represents
a single 16-bit term, such as a filter coefficient,
threshold, delay, or other quantity. These registers can
be read from or written to as a single 16-bit value. The
second type of U-Register is bit-mapped. Bit-mapped
registers are written and/or read in hexadecimal, but
each bit or combination of bits in the register represents
an independent value or status information. These
individual bits are used to enable or disable features
and indicate states.
Some U-Registers are reserved and not available to the
user. Therefore, there are gaps in the available URegister address map. Additionally, some bits within
available U-Registers are reserved. Any attempt to write
a non-zero value to a reserved U-Register or bit may
cause unpredictable modem operation.
With over 100 U-Registers, the Si2493 offers an
unprecedented level of programmability for a controllerbased modem. A detailed list of these registers and
their use is beyond the scope of this data sheet. Refer
to “AN93: ISOmodem® Chipset Family Designer’s
Guide” for details.
Rev. 1.3
45
Si2493
7. Pin Descriptions: Si2493 (16-Pin Option)
Si2493
(16-Pin Option)
Pin #
1
CLKIN/XTALI
1
16
SS/RTS
XTALO
RI
VD
2
15
DCD
3
4
14
13
MISO/RXD
MOSI/TXD
SCLK/CTS
RESET
5
6
7
12
11
ESC
VA
GND
INT
10
9
C1A
C2A
8
Pin Name
Description
CLKIN/XTALI XTALI—Crystal Oscillator Pin.
Provides support for parallel resonant AT cut crystals. A 4.9152 MHz or 32.768 kHz crystal
or a 32.768 kHz or 4.9152 or 27 MHz clock on XTALI is required.
2
XTALO
3
RI
Ring Indicator.
The RI on (active low) indicates the presence of an ON segment of a ring signal on the telephone line.
4
VD
Supply Voltage.
Provides the 3.3 V supply voltage to the Si2493.
5
MISO/RXD
Master In Slave Out/Receive Data.
Serial data output from modem in SPI mode.
Data output to DTE RXD pin in UART mode.
6
MOSI/TXD
Master Out Slave In/Transmit Data.
Serial data input to modem in SPI mode.
Data input from DTE TXD pin in UART mode.
7
SCLK/CTS
Serial Data Clock/Clear to Send.
Signals that the Si2493 is ready to receive more digital data on the TXD pin.
Serial data clock input in SPI mode.
8
RESET
9
C2A
Isolation Capacitor 2A.
Connects to one side of the isolation capacitor C2.
10
C1A
Isolation Capacitor 1A.
Connects to one side of the isolation capacitor C1.
11
INT
Interrupt Output.
Active low interrupt output.
46
XTALO—Crystal Oscillator Pin.
Serves as the output of the crystal amplifier.
Reset Input.
An active low input that is used to reset all control registers to a defined, initialized
state.
Rev. 1.3
Si2493
Pin #
Pin Name
Description
12
GND
13
VA
14
ESC
Escape.
A positive edge on this pin causes the modem to go from online (connected) mode to
the offline (command) mode.
15
DCD
Carrier Detect.
Active low carrier detect.
16
SS/RTS
Ground.
Connects to the system digital ground.
Regulator Voltage Reference.
Connects to an external capacitor and serves as the reference for the internal
voltage regulator.
SPI Slave Select/Request to Send.
Active low slave select in SPI mode.
Active low request to send input used for flow control in UART mode.
Rev. 1.3
47
Si2493
8. Pin Descriptions: Si2493 (24-Pin Option)
Si2493
(24-Pin Option)
CLKIN/XTALI
1
24
SDO/EECLK/D5
XTALO
23
CLKOUT/EECS/A0
2
3
DCD/D4
ESC/D3
FSYNC/D6
4
21
VD3.3
VD3.3
5
GND
6
20
19
GND
VDB
VDA
7
18
SDI/EESD/D2
SS/RTS/D7
8
RI/D1
INT/DO
AOUT/INT
22
MOSI/TXD/WR
9
10
17
16
15
SCLK/CTS/CS
11
14
C1A
RESET
12
13
C2A
MISO/RXD/RD
Pin #
Pin Name
Description
1
CLKIN/XTALI
2
XTALO
3
CLKOUT/EECS/
A0
Clock Output/EEPROM Chip Select/Address Bit 0.
Clock output in serial mode. Active low read/write enable for SPI EEPROM in
serial mode when pin 4 is pulled low during powerup. Address Enable in parallel
mode.
4
FSYNC/D6
Frame Sync/Data Bit.
Frame Sync output to codec in serial mode. Bidirectional parallel bus data bit 6 in
parallel mode.
5, 21
VD3.3
Digital Supply Voltage.
Provides the 3.3 V supply voltage to the Si2493.
6, 20
GND
Ground.
Connects to the system digital ground.
7,19
VDA, VDB
Clock Input/Crystal Oscillator Pin.
Provides support for parallel resonant AT cut crystals. A 4.9152 MHz or
32.768 kHz crystal or a 32.768 kHz or 4.9152 or 27 MHz clock on XTALI is
required.
Crystal Oscillator Pin.
Serves as the output of the crystal amplifier.
Regulator Voltage Reference.
Connects to an external capacitor and serves as the reference for the internal
voltage regulator.
8
48
SS/RTS/D7
SPI Slave Select/Request to Send/Data Bit.
Active low slave select in SPI mode.
Active low request to send input used for flow control in UART mode. Bidirectional parallel bus data bit 7 in parallel mode.
Rev. 1.3
Si2493
Pin #
Pin Name
Description
9
MISO/RXD/RD
Master In Slave Out/Receive Data/Read Enable.
Serial data output from modem in SPI mode. Data output to DTE RXD pin in
UART mode. Active low read enable pin in parallel mode.
10
MOSI/TXD/WR
Master Out Slave In/Transmit Data/Write Enable.
Serial data input to modem in SPI mode. Data input from DTE TXD pin in serial
mode. Active low write enable pin in parallel mode.
11
SCLK/CTS/CS
Serial Data Clock/Clear to Send/Chip Select.
Serial data clock input in SPI mode. Signals that the Si2493 is ready to receive
more digital data on the TXD pin in data mode. Active low chip select in parallel
mode.
12
RESET
Reset Input.
An active low input that is used to reset all control registers to a defined initialized
state.
13
C2A
Isolation Capacitor 2A.
Connects to one side of the isolation capacitor, C2.
14
C1A
Isolation Capacitor 1A.
Connects to one side of the isolation capacitor, C1.
15
AOUT/INT
16
INT/D0
Interrupt Output/Data Bit.
Active low interrupt output in serial mode. Bidirectional parallel bus data bit 0 in
parallel mode.
17
RI/D1
Ring Indicator/Data Bit.
The RI on (active low) indicates the presence of an ON segment of a ring signal
on the telephone line. Bidirectional parallel bus data bit 1 in parallel mode.
18
SDI/EESD/D2
Serial Data In/EEPROM Serial Data Input/Output/Data Bit.
Serial Data In (to codec) output in serial mode. Bidirectional Input/Output to SPI
EEPROM in serial mode when pin 4 is pulled low during power up. Bidirectional
parallel bus data bit 2 in parallel mode.
22
ESC/D3
Escape/Data Bit.
Hardware escape in serial mode. Bidirectional parallel bus data bit 3 in parallel
mode.
23
DCD/D4
Carrier Detect/Data Bit.
Active low carrier detect in serial mode. Bidirectional parallel bus data bit 4 in parallel mode.
24
SDO/EECLK/D5
Serial Data Out/EEPROM Clock/Data Bit 5.
Serial Data Out (from codec) input in serial mode. Clock output for SPI EEPROM
in serial mode when pin 4 is pulled low during power up. Bidirectional parallel bus
data bit 5 in parallel mode.
Analog Output/Interrupt Output.
Analog output in serial mode. Active low interrupt output in parallel mode.
Rev. 1.3
49
Si2493
9. Pin Descriptions: Si3018
Si3018
QE
DCT
RX
IB
1
2
3
4
C1B
C2B
VREG
5
RNG1
8
6
7
16
15
DCT2
14
DCT3
QB
QE2
IGND
13
12
11
10
9
SC
VREG2
RNG2
Table 14. Si3018 Pin Descriptions
Pin #
1
Pin Name
QE
2
DCT
3
RX
4
IB
5
C1B
6
C2B
7
VREG
8
RNG1
9
RNG2
10
VREG2
11
SC
12
QE2
13
QB
14
DCT3
15
IGND
16
DCT2
50
Description
Transistor Emitter.
Connects to the emitter of Q3.
DC Termination.
Provides dc termination to the telephone network.
Receive Input.
Serves as the receive side input from the telephone network.
Internal Bias.
Provides a bias voltage to the device.
Isolation Capacitor 1B.
Connects to one side of isolation capacitor C1 and communicates with the system side.
Isolation Capacitor 2B.
Connects to one side of isolation capacitor C2 and communicates with the system side.
Voltage Regulator.
Connects to an external capacitor to provide bypassing for an internal power supply.
Ring 1.
Connects through a resistor to the RING lead of the telephone line. Provides the ring and
caller ID signals to the Si2493.
Ring 2.
Connects through a resistor to the TIP lead of the telephone line. Provides the ring and
caller ID signals to the Si2493.
Voltage Regulator 2.
Connects to an external capacitor to provide bypassing for an internal power supply.
SC Connection.
Enables external transistor network. Should be tied through a 0  resistor to IGND.
Transistor Emitter 2.
Connects to the emitter of Q4.
Transistor Base.
Connects to the base of transistor Q4.
DC Termination 3.
Provides the dc termination to the telephone network.
Isolated Ground.
Connects to ground on the line-side interface.
DC Termination 2.
Provides dc termination to the telephone network.
Rev. 1.3
Si2493
10. Ordering Guide
Chipset
Max Speed
System-Side
Package
System-Side
Line-Side
Temp Range
Si2493
56 kbps
24-pin TSSOP
Si2493-D-FT
Si3018-F-FS
0 to 70 °C
Si2493
56 kbps
16-pin SOIC
Si2493-D-FS
Si3018-F-FS
0 to 70 °C
Si2493
56 kbps
24-pin TSSOP
Si2493-D-GT
Si3018-F-GS
–40 to 85 °C
Note: Add an “R” at the end of the device to denote tape and reel option.
Rev. 1.3
51
Si2493
11. Package Markings (Top Markings)
Codes for the Si2493-D-FT and Si2493-D-FS top marks are as follows:

YY = Current Year
WW = Work Week
 R = Die Revision
 TTTTT = Trace Code
 XX = Assembly Country Code

11.1. Si2493-D-FT Top Marking
Figure 11. Si2493-D-FT Top Marking
11.2. Si2493-D-FS Top Marking
Figure 12. Si2493-D-FS Top Marking
11.3. Si3018-F-FS Top Marking
Figure 13. Si3018-F-FS Top Marking
52
Rev. 1.3
Si2493
12. Package Outline: 24-Pin TSSOP
Figure 14 illustrates the package details for the Si2493 24-pin packaging option. Table 15 lists the values for the
dimensions shown in the illustration.
Figure 14. 24-Pin Thin Shrink Small Outline Package (TSSOP)
Table 15. Package Diagram Dimensions
Dimension
Min
Nom
Max
A
—
—
1.20
A1
0.05
—
0.15
A2
0.80
1.00
1.05
b
0.19
—
0.30
c
0.09
—
0.20
D
7.70
7.80
7.90
E
E1
6.40 BSC
4.30
4.40
e
L
0.65 BSC
0.45
0.60
L2
θ
4.50
0.75
0.25 BSC
0°
—
aaa
0.10
bbb
0.10
ccc
0.20
8°
Notes:
1. All dimensions shown are in millimeters (mm) unless otherwise noted.
2. Dimensioning and Tolerancing per ANSI Y14.5M-1994.
3. This drawing conforms to the JEDEC Solid State Outline MO-153,
Variation AD.
4. Recommended card reflow profile is per the JEDEC/IPC J-STD-020
specification for Small Body Components.
Rev. 1.3
53
Si2493
13. 24-Pin TSSOP Land Pattern
Figure 15 illustrates the recommended land pattern for the Si2493 24-Pin TSSOP. Table 16 lists the values for the
dimensions shown in the illustration.
Figure 15. 24-Pin TSSOP Land Pattern Diagram
Table 16. 24-Pin TSSOP PCB Land Pattern
Dimension
Feature
(mm)
C1
Pad Column Spacing
5.80
E
Pad Row Pitch
0.65
X1
Pad Width
0.45
Y1
Pad Length
1.40
Notes:
1. This Land Pattern Design is based on IPC-7351 specifications for Density Level B
(Median Land Protrusion).
2. All feature sizes shown are at Maximum Material Condition (MMC) and a card
fabrication tolerance of 0.05 mm is assumed.
54
Rev. 1.3
Si2493
14. Package Outline: 16-Pin SOIC
Figure 16 illustrates the package details for the Si2493 16-pin packaging option. Table 17 lists the values for the
dimensions shown in the illustration.
Figure 16. 16-Pin Small Outline Integrated Circuit (SOIC) Package
Rev. 1.3
55
Si2493
Table 17. Package Diagram Dimensions
Dimension
Min
Max
A
—
1.75
A1
0.10
0.25
A2
1.25
—
b
0.31
0.51
c
0.17
0.25
D
9.90 BSC
E
6.00 BSC
E1
3.90 BSC
e
1.27 BSC
L
0.40
L2
1.27
0.25 BSC
h
0.25
0.50
θ
0°
8°
aaa
0.10
bbb
0.20
ccc
0.10
ddd
0.25
Notes:
1. All dimensions shown are in millimeters (mm) unless otherwise noted.
2. Dimensioning and Tolerancing per ANSI Y14.5M-1994.
3. This drawing conforms to the JEDEC Solid State Outline MS-012,
Variation AC.
4. Recommended card reflow profile is per the JEDEC/IPC J-STD-020
specification for Small Body Components.
56
Rev. 1.3
Si2493
15. 16-Pin SOIC Land Pattern
Figure 17 illustrates the recommended land pattern for the Si2493 16-Pin SOIC. Table 18 lists the values for the
dimensions shown in the illustration.
Figure 17. 16-Pin SOIC Land Pattern Diagram
Table 18. 16-Pin SOIC Land Pattern Dimensions
Dimension
Feature
(mm)
C1
Pad Column Spacing
5.40
E
Pad Row Pitch
1.27
X1
Pad Width
0.60
Y1
Pad Length
1.55
Notes:
General
1. All dimensions shown are in millimeters (mm) unless otherwise noted.
2. Dimensioning and Tolerancing per ASME Y14.5M-1994.
3. This Land Pattern Design is based on the IPC-7351 guidelines.
4. All dimensions shown are at Maximum Material Condition (MMC). Least Material
Condition (LMC) is calculated based on a Fabrication Allowance of 0.05 mm.
Solder Mask Design
5. All metal pads are to be non-solder mask defined (NSMD). Clearance between the
solder mask and the metal pad is to be 60 µm minimum, all the way around the pad.
Stencil Design
6. A stainless steel, laser-cut and electro-polished stencil with trapezoidal walls should
be used to assure good solder paste release.
7. The stencil thickness should be 0.125 mm (5 mils).
8. The ratio of stencil aperture to land pad size should be 1:1.
Card Assembly
9. A No-Clean, Type-3 solder paste is recommended.
10. The recommended card reflow profile is per the JEDEC/IPC J-STD-020
specification for Small Body Components.
Rev. 1.3
57
Si2493
DOCUMENT CHANGE LIST
Revision 0.91 to Revision 1.0








Updated “ Features” and " Description" on page 1.
Added Figure 5 typical schematic with 16-pin
system-side option.
Updated Table 3 to include 16-pin system-side
parameters.
Updated default register setting in Table 14.
Added 16-pin system-side option.
Updated "4. Functional Description" on page 18.
Added "7. Pin Descriptions: Si2493 (16-Pin Option)"
on page 46.
Updated "10. Ordering Guide" on page 51 to reflect
part revision.
Revision 1.0 to Revision 1.1

Added industrial temperature range devices.
Revision 1.1 to Revision 1.2

Added Revision D additions and changes:
32.768
SPI


kHz oscillator option
interface
Moved U-Register details to AN93.
Added package markings.
Revision 1.2 to Revision 1.3

Removed 5 V interface logic support.
 Lowered digital input voltage VIND max from 5.3 V to
(VD + 0.3) V.

Lowered total supply current (typ) from 26 to 17 mA.
 Added total supply current, wake-on-ring
specification.
58
Rev. 1.3
Si2493
NOTES:
Rev. 1.3
59
Si2493
CONTACT INFORMATION
Silicon Laboratories Inc.
400 West Cesar Chavez
Austin, TX 78701
Tel: 1+(512) 416-8500
Fax: 1+(512) 416-9669
Toll Free: 1+(877) 444-3032
Please visit the Silicon Labs Technical Support web page:
https://www.silabs.com/support/pages/contacttechnicalsupport.aspx
and register to submit a technical support request.
The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice.
Silicon Laboratories assumes no responsibility for errors and omissions, and disclaims responsibility for any consequences resulting from
the use of information included herein. Additionally, Silicon Laboratories assumes no responsibility for the functioning of undescribed features
or parameters. Silicon Laboratories reserves the right to make changes without further notice. Silicon Laboratories makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Silicon Laboratories assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. Silicon Laboratories products are not designed, intended, or authorized for use in applications intended to
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Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders.
60
Rev. 1.3
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