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Da tas he et
A S11 06 , A S 11 0 7
8 -D ig it L E D D is p la y D r iv e r s
2 Key Features
The devices include an integrated BCD code-B/HEX decoder,
multiplex scan circuitry, segment and display drivers, and a 64-bit
memory. Internal memory stores the LED settings, eliminating the
need for continuous device reprogramming.
Every segment can be individually addressed and updated
separately. Only one external resistor (RSET) is required to set the
current through the LED display. LED brightness can be controlled
by analog or digital means. The devices can be programmed to use
the internal code-B/HEX decoder to display numeric digits or to
directly address each segment.
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10MHz SPI-, QSPI-, Microwire-Compatible Serial I/O
Individual LED Segment Control
Segment Blinking Control (can be synchronized across multiple
drivers)
Hexadecimal- or BCD-Code/No-Decode Digit Selection
3µA Low-Power Shutdown Current (typ; data retained)
Extremely Low Operating Current 0.5mA in Open-Loop
Digital and Analog Brightness Control
Display Blanked on Power-Up
Drive Common-Cathode LED Displays
Low-EMI Low Slew-Rate Limited Segment
Drivers (AS1107)
Supply Voltage Range: 2.7 to 5.5V
Software Reset
Optional External Clock
SOIC 24-pin Package
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The AS1106 and the AS1107 are compact display drivers for 7segment numeric displays of up to 8 digits. The devices can be
programmed via SPI, QSPI, and Microwire as well as a conventional
4-wire serial interface.
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1 General Description
The AS1106 and the AS1107 feature an extremely low shutdown
current of typically 3µA, and an operational current of less than
500µA. The number of digits can be programmed, the devices can
be reset by software, and an external clock is also supported.
Additionally, segment blinking can be synchronized across multiple
drivers.
3 Applications
Several test modes are available for easy application debugging.
The AS1106 and AS1107 are ideal for bar-graph displays,
instrument-panel meters, LED matrix displays, dot matrix displays,
set-top boxes, white goods, professional audio equipment, medical
equipment, industrial controllers and panel meters.
The devices are available in a SOIC 24-pin package.
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Figure 1. AS1106, AS1107 - Typical Application Diagram
ni
9.53kΩ
ch
Te
SCK
Microprocessor
VDD
8 Digits
ISET
DIG0 to
DIG7
DIN
I/O
I/O
+5V
LOAD/CSN
AS1106/
AS1107
CLK
8 Segments
SEG A to G
SEP DP
GND
www.austriamicrosystems.com/LED-Driver-ICs/AS1106_07
GND
8-Digit Microprocessor Display
Revision 2.29
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AS1106, AS1107
Datasheet - P i n A s s i g n m e n t s
4 Pin Assignments
24
DOUT
DIG 0
2
23
SEG D
DIG 4
3
22
SEG DP
GND
4
21
SEG E
DIG 6
5
20
SEG C
DIG 2
6
19
VDD
DIG 3
7
18
ISET
DIG 7
8
17
SEG G
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1
AS1106/
AS1107
DIN
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Figure 2. Pin Assignments (Top View)
GND
9
16
SEG B
DIG 5
10
15
SEG F
DIG 1
11
14
SEG A
LOAD/CSN
12
13
CLK
4.1 Pin Descriptions
Table 1. Pin Descriptions
Pin Number
1
DIN
DIG 0:DIG 7
Description
Serial-Data Input. Data is loaded into the internal 16-bit shift register on the rising edge of
pin CLK.
Digit Drive Lines. 8 Eight-digit drive lines that sink current from the display common
cathode. The AS1106 pulls the digit outputs to VDD when turned off. The AS1107 digit drivers
are high-impedance when turned off.
Ground. Both GND pins must be connected.
Load-Data Input (AS1106 only). The last 16 bits of serial data are latched on the rising edge
of this pin.
Chip-Select Input (AS1107 or AS1106 SPI-enabled only). Serial data is loaded into the shift
register while this pin is low. The last 16 bits of serial data are latched on the rising edge of
this pin.
Serial-Clock Input. 10MHz maximum rate. Data is shifted into the internal shift register on
the rising edge of this pin. Data is clocked out of pin DOUT on the falling edge of this pin. On
the AS1107 or AS1106 SPI-enabled, the CLK input is active only while LOAD/CSN is low.
Seven Segment and Decimal Point Drive Lines. 8 seven-segment drives and decimal
point drive that source current to the display. On the AS1106, when a segment driver is
turned off it is pulled to GND. The AS1107 segment drivers are high-impedance when turned
off.
Set Segment Current. Connect to VDD through RSET to set the peak segment current (see
Selecting RSET Resistor Value and Using External Drivers on page 14).
Positive Supply Voltage. Connect to +2.7 to +5.5V supply.
Serial-Data Output. The data into pin DIN is valid at pin DOUT 16.5 clock cycles later. This
pin is used to daisy-chain several AS1106/AS1107 devices and is never high-impedance.
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2, 3, 5, 6, 7, 8, 10,
11
4, 9
GND
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LOAD/CSN
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12
Pin Name
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13
CLK
14, 15, 16, 17, 20,
21, 22, 23
SEG A:SEG G, SEG DP
18
ISET
19
VDD
24
DOUT
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Revision 2.29
2 - 20
AS1106, AS1107
Datasheet - A b s o l u t e M a x i m u m R a t i n g s
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only, and functional operation of
the device at these or any other conditions beyond those indicated in Electrical Characteristics on page 4 is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Table 2. Absolute Maximum Ratings
Max
Units
-0.3
7
V
-0.3
VDD + 0.3
(max 7V)
V
DIG 0:DIG 7 Sink Current
500
mA
SEG A:SEG G, SEG DP
100
mA
Latch-Up Immunity
±200
mA
Digital outputs
1000
V
All other pins
1000
V
941
mW
+150
ºC
Electrical Parameters
VDD to GND
All other pins to GND
Electrostatic Discharge
All pins except AS1106 pin 14: ±180 mA
Norm: JEDEC 78
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Current
Notes
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Min
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Parameter
Norm: MIL 883 E method 3015
Continuous Power Dissipation (TA = +85°C)
Wide SOIC
Derate 11.8mW/ºC
above +70ºC
Temperature Ranges and Storage Conditions
Storage Temperature Range
-55
Package Body Temperature (Wide SOIC)
Humidity
5
ºC
85
%
Non-condensing
3
Represents a max. floor life time of 168h
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Moisture Sensitive Level
+260
The reflow peak soldering temperature (body
temperature) specified is in accordance with IPC/
JEDEC J-STD-020 “Moisture/Reflow Sensitivity
Classification for Non-Hermetic Solid State Surface
Mount Devices”.
The lead finish for Pb-free leaded packages is
matte tin (100% Sn).
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Revision 2.29
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AS1106, AS1107
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
VDD = 2.7V to 5.5V, RSET = 9.53kΩ±1%, TAMB = TMIN to TMAX (unless otherwise specified). All limits are guaranteed. The
parameters with min and max values are guaranteed with production tests or SQC (Statistical Qualification Control)
methods.
Table 3. Electrical Characteristics
Parameter
Conditions
Min
Typ
TAMB
Operating Temperature Range
-40
VDD
Operating Supply Voltage
2.7
IDDSD
Shutdown Supply Current
IDD
Operating Supply Current
All segments and decimal point on;
ISEG = -40mA.
fOSC
Display Scan Rate
8 digits scanned
500
IDIGIT
Digit Drive Sink Current
VOUT = 0.65V
320
ISEG
Segment Drive Source Current
VDD = 5.0V, VOUT = (VDD -1V)
-30
-40
-45
mA
∆ISEG/∆t
Segment Current Slew Rate
(AS1107 only)
TAMB = +25ºC, VDD = 5.0V,
VOUT = (VDD -1V)
10
20
50
mA/µs
∆ISEG
Segment Drive Current Matching
IDIGIT
Digit Drive Leakage
(AS1107 only)
Digit off, VDIGIT = VDD
-10
µA
ISEG
Segment Drive Leakage
(AS1107 only)
Segment off, VSEG = 0V
1
µA
IDIGIT
Digit Drive Source Current
(AS1106 only)
Digit off, VDIGIT = (VDD - 0.3V)
-2
mA
ISEG
Segment Drive Sink Current
(AS1106 only)
Segment off, VSEG = 0.3V
5
mA
tSLOWBLINK
Slow Segment Blink Period (ON phase,
Internal Oscillator)
0.64
1
1.65
s
tFASTBLINK
Fast Segment Blink Period
(ON phase, Internal Oscillator)
0.32
0.5
0.83
s
Fast or Slow Segment Blink Duty Cycle
(Guaranteed by design)
49.9
50
50.1
%
Min
Typ
Max
Unit
1
µA
5.0
All digital inputs at VDD or GND,
TAMB = +25ºC
Unit
+85
ºC
5.5
V
10
µA
1
mA
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RSET = open circuit.
Max
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Symbol
Hz
mA
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1300
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330
800
3.0
%
Table 4. Logic Inputs/Outputs Characteristics
IIH, IIL
VIH
Conditions
Input Current DIN, CLK, LOAD/CSN
VIN = 0V or VDD
Logic High Input Voltage
Logic Low Input Voltage
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Parameter
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Symbol
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VOH
Output High Voltage
V
VDD = 5.0V ± 10%
0.8
VDD = 3.0V ± 10%
0.6
DOUT, ISOURCE = -1mA,
VDD = 5.0V ± 10%
VDD - 1
DOUT, ISOURCE = -1mA,
VDD = 3.0V ± 10%
VDD - 0.5
VOL
Output Low Voltage
DOUT, ISINK = 1.6mA
∆VI
Hysteresis Voltage
DIN, CLK, LOAD/CSN
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-1
0.7 x VDD
Revision 2.29
V
V
0.4
1
V
V
4 - 20
AS1106, AS1107
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
Table 5. Timing Characteristics (see Figure 12 on page 8)
100
ns
tCH
CLK Pulse Width High
50
ns
tCL
50
ns
25
ns
tDS
CLK Pulse Width Low
CSM Fall to CLK Rise Setup Time
(AS1107 or AS1106 SPI-programmed)
CLK Rise to LOAD/CSN Rise
Hold Time
DIN Setup Time
tDH
DIN Hold Time
tDO
Output Data Propagation Delay
tCSS
tCSH
tDSPD
Data-to-Segment Delay
Min
0
25
0
CLOAD = 50pF
Typ
Max
ns
ns
25
50
50
Unit
ns
ns
ns
ns
2.25
ms
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tCSW
LOAD Rising Edge to Next Clock Rising Edge
(AS1106 only)
Minimum LOAD/CSN Pulse High
tLDCK
Conditions
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tCP
Parameter
CLK Clock Period
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Symbol
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Revision 2.29
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AS1106, AS1107
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
7 Typical Operating Characteristics
VDD = 5V, RSET = 9.53kΩ, TAMB = 25ºC (unless otherwise specified).
Figure 4. Scan Frequency vs. VDD
990
980
980
970
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Figure 3. Scan Frequency vs.Temperature
960
960
950
940
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FOSC (Hz)
FOSC (Hz)
970
930
950
920
940
930
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910
900
-40
-20
0
20
40
60
80
2
3
4
TAMB [°C]
Figure 5. ISEG vs. Temperature
50
6
Figure 6. ISEG vs. VDD
60
VDD = 5V, VOUT = 2.4V
45
5
VDD (V)
50
40
VDD = 5V, VOUT = 4V
25
ISEG (mA)
40
30
VDD = 2.7V, VOUT = 2V
20
VOUT = 1.7V
30
VOUT = 4V
20
15
VDD = 2.7V, VOUT = 2.4V
10
VOUT = 2.4V
10
5
0
0
-40
-20
0
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ISEG (mA)
35
20
40
60
2
80
2.5
3
3.5
4
4.5
5
5.5
6
VDD (V)
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TAMB (°C)
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Revision 2.29
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AS1106, AS1107
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
Figure 7. AS1106 Segment Output Current
Figure 8. AS1107 Segment Output Current
50
45
45
40
40
35
35
30
30
20
25
20
15
15
10
10
5
5
0
0
0.0
5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0
0.0
5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0
Time (µs)
Figure 10. ISEG vs. VOUT
VDD = 2.7V
50
25
RSET = 10kΩ
45
40
RSET = 10kΩ
30
25
ISEG (mA)
20
35
ISEG (mA)
Time (µs)
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Figure 9. ISEG vs. VOUT
RSET = 20kΩ
20
15
15
RSET = 20kΩ
10
RSET = 40kΩ
10
5
RSET = 40kΩ
5
0
0
1 1.5
Figure 11. ISEG vs. RSET
60
4 4.5
0
5
0.5
1
1.5
2
2.5
VOUT (V)
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VOUT = 2.4V
2 2.5 3 3.5
VOUT (V)
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0 0.5
50
40
ch
ISEG (mA)
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25
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Intensity = 15/16 (0Fh)
50
ISEG (mA)
ISEG (mA)
Intensity = 31/32 (0Fh)
VOUT
= 4V
30
VOUT = 2V
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20
VDD = 5V
10
VOUT = 1.7V
VDD = 2.7V
0
0
10
20
30
40
50
60
70
80
RSET (k Ω)
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Revision 2.29
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AS1106, AS1107
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
8.1 AS1106 vs. AS1107
The AS1106 and AS1107 are identical except for two features:
The AS1107 segment drivers are slew-rate limited to reduce electromagnetic interference (EMI).
The AS1107 serial interface is fully SPI compatible (programmable for AS1106).
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8.2 Serial-Addressing Format
Programming the AS1106/AS1107 is done by writing to the device’s internal registers (see Digit- and Control-Registers on page 9) via the 4-wire
serial interface. A programming sequence consists of 16-bit packages as listed in Table 6.
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The data is shifted into the internal 16-bit register with the rising edge of the CLK signal. With the rising edge of the LOAD/CSN signal the data is
latched into a digit- or control-register. The LOAD/CSN signal must go high after the 16th rising clock edge.
The LOAD/CSN signal can also come later but this must happen just before the next rising edge of CLK, otherwise the data will be lost. The
contents of the internal shift register are applied 16.5 clock cycles later to pin DOUT. The data is clocked out at the falling edge of CLK.
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The first 4 bits (D15:D12) are “don't care”, bits D11:D8 contain the register address, and bits D7:D0 contain the data. The first bit is D15, the most
significant bit (MSB). The exact timing is shown in Figure 12.
Table 6. 16-Bit Serial Data Format
D15
X
D14
X
D13
X
D12
X
8.3 Initial Power-Up
D11
D10
D9
D8
Register Address (see Table 7)
D7
MSB
D6
D5
D4
D3
Data
D2
D1
D0
LSB
On initial power-up, the AS1106/AS1107 registers are reset to their default values, the display is blanked, and the device goes into shutdown
mode. At this time, all registers should be programmed for normal operation.
Note: The default settings enable only scanning of one digit; the internal decoder is disabled and the Intensity Control Register (see page 12)
is set to the minimum values.
Figure 12. Interface Timing
LOAD/CSN
ca
tCSW
tCSS
tLDCK
tCH
ni
CLK
tCL
tCSH
tCP
tDH
ch
tDS
D15
D14
D1
D0
tDO
Te
DIN
DOUT
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Revision 2.29
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AS1106, AS1107
Datasheet - D e t a i l e d D e s c r i p t i o n
8.4 Shutdown Mode
The AS1106/AS1107 devices feature a shutdown mode, where they consume only 10µA (max) current. Shutdown mode is entered via a write to
the Shutdown Register (see Table 8). For the AS1106, at that point, all segment current sources are pulled to ground and all digit drivers are
connected to VDD, so that all segments are blanked. The AS1107 behavior is identical except the drivers are high impedance.
Note: During shutdown mode the Digit-Registers maintain their data.
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Shutdown mode can either be used as a means to reduce power consumption or for generating a flashing display (repeatedly entering and
leaving shutdown mode). For minimum supply current in shutdown mode, logic input should be at GND or VDD (CMOS logic level).
The devices need typically 250µs to exit shutdown mode, and during shutdown mode the AS1106/AS1107 is fully programmable. Only the
display test mode (see page 11) overrides shutdown mode.
When entering or leaving shutdown mode, the Feature Register is reset to its default values (all 0s) when Shutdown Register bit D7 (page 10) =
1
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0.
Note: If the AS1106/AS1107 is used with an external clock, Shutdown Register bit D7 should be set to 1 when writing to the Shutdown Register.
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8.5 Digit- and Control-Registers
The AS1106/AS1107 devices contain 8 Digit-Registers and 6 control-registers, which are listed in Table 7. All registers are selected using a 4-bit
address word, and communication is done via the serial interface.
Digit Registers – These registers are realized with an on-chip 64-bit memory. Each digit can be controlled directly without rewriting the
whole register contents.
Control Registers – These registers consist of decode mode, display intensity, number of scanned digits, shutdown, display test and features selection registers.
Table 7. Register Address Map
No-Op
Digit 0
Digit 1
Digit 2
Digit 3
Digit 4
Digit 5
Digit 7
Address
D15:D12
D11
D10
D9
D8
Page
0xX0
X
0
0
0
0
13
0xX1
X
0
0
0
1
N/A
0xX2
X
0
0
1
0
N/A
0xX3
X
0
0
1
1
N/A
0xX4
X
0
1
0
0
N/A
0xX5
X
0
1
0
1
N/A
0xX6
X
0
1
1
0
N/A
0xX7
X
0
1
1
1
N/A
0xX8
X
1
0
0
0
N/A
0xX9
X
1
0
0
1
10
Intensity Control
0xXA
X
1
0
1
0
12
Scan Limit
0xXB
X
1
0
1
1
12
ch
Digit 6
HEX Code
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Register
Shutdown
0xXC
X
1
1
0
0
10
N/A
0xXD
X
1
1
0
1
N/A
Feature
0xXE
X
1
1
1
0
13
Display Test
0xXF
X
1
1
1
1
11
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Decode-Mode
1. When Shutdown Register bit D7 = 1, the Feature Register is left unchanged when entering or leaving shutdown mode.
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Revision 2.29
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AS1106, AS1107
Datasheet - D e t a i l e d D e s c r i p t i o n
8.5.1
Shutdown Register (0xXC)
The Shutdown Register controls AS1106/AS1107 shutdown mode (see Shutdown Mode on page 9).
Table 8. Shutdown Register Format (Address (HEX) = 0xXC))
Shutdown Mode,
Reset Feature Register to Default Settings
Shutdown Mode, Feature Register Unchanged
Normal Operation,
Reset Feature Register to Default Settings
Normal Operation, Feature Register Unchanged
Register Data
D7
D6
D5
D4
D3
D2
D1
D0
0x00
0
X
X
X
X
X
X
0
0x80
1
X
X
X
X
0x01
0
X
X
X
X
0x81
1
X
X
X
X
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HEX Code
Decode Enable Register (0xX9)
X
X
0
X
X
1
X
X
1
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8.5.2
Mode
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The Decode Enable Register sets the decode mode. BCD/HEX decoding (either BCD code – characters 0:9, E, H, L, P, and -, or HEX code –
characters 0:9 and A:F) is selected by bit D2 (page 13) of the Feature Register. The Decode Enable Register is used to select the decode mode
or no-decode for each digit. Each bit in the Decode Enable Register corresponds to its respective display digit (i.e., bit D0 corresponds to digit 0,
bit D1 corresponds to digit 1 and so on). Table 10 lists some examples of the possible settings for the Decode Enable Register bits.
Note: A logic high enables decoding and a logic low bypasses the decoder altogether.
When decode mode is used, the decoder looks only at the lower-nibble (bits D3:D0) of the data in the Digit-Registers, disregarding bits D6:D4.
Bit D7 sets the decimal point (SEG DP) independent of the decoder and is positive logic (bit D7 = 1 turns the decimal point on). Table 10 lists the
code-B font; Table 11 lists the HEX font.
When no-decode mode is selected, data bits D7:D0 of the Digit-Registers correspond to the segment lines of the AS1106/AS1107. Table 12
shows the 1:1 pairing of each data bit to the appropriate segment line.
Table 9. Decode Enable Register Format (Address (HEX) = 0xX9))
Decode Mode
HEX Code
No decode for digits 7:0
Code-B/HEX decode for digit 0. No decode for digits 7:1
Code-B/HEX decode for digits 3:0. No decode for digits 7:4
Code-B/HEX decode for digits 7:0
0x00
0x01
0x0F
0xFF
D7
0
0
0
1
D6
0
0
0
1
D5
0
0
0
1
Register Data
D4 D3
0
0
0
0
0
1
1
1
D2
0
0
1
1
D1
0
0
1
1
D0
0
1
1
1
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Figure 13. Standard 7-Segment LED Intensity Control and Inter-Digit Blanking
A
F
B
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E
D
DP
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Table 10. Code-B Font
Register Data
7-Segment Character
0
1
2
3
4
D7
†
D6:D4
X
X
X
X
X
D3
0
0
0
0
0
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D2
0
0
0
0
1
On Segments = 1
D1
0
0
1
1
0
D0
0
1
0
1
0
Revision 2.29
DP
†
A
1
0
1
1
0
B
1
1
1
1
1
C
1
1
0
1
1
D
1
0
1
1
0
E
1
0
1
0
0
F
1
0
0
0
1
G
0
0
1
1
1
10 - 20
AS1106, AS1107
Datasheet - D e t a i l e d D e s c r i p t i o n
Table 10. Code-B Font (Continued)
5
6
7
8
9
E
H
L
P
Blank
D3
0
0
0
1
1
1
1
1
1
1
1
D2
1
1
1
0
0
0
0
1
1
1
1
D1
0
1
1
0
0
1
1
0
0
1
1
D0
1
0
1
0
1
0
1
0
1
0
1
DP
A
1
1
1
1
1
0
1
0
0
1
0
B
0
0
1
1
1
0
0
1
0
1
0
C
1
1
1
1
1
0
0
1
0
0
0
The decimal point is enabled by setting bit D7 = 1.
Table 11. HEX Font
Register Data
7-Segment Character
D7
†
E
0
1
0
1
0
0
1
1
1
1
0
F
1
1
0
1
1
0
1
1
1
1
0
†
D6:D4
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
D3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
D2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
G
1
1
0
1
1
1
1
1
0
1
0
On Segments = 1
D1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
D0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
DP
†
A
1
0
1
1
0
1
1
1
1
1
1
0
1
0
1
1
B
1
1
1
1
1
0
0
1
1
1
1
0
0
1
0
0
C
1
1
0
1
1
1
1
1
1
1
1
1
0
1
0
0
D
1
0
1
1
0
1
1
0
1
1
0
1
1
1
1
0
E
1
0
1
0
0
0
1
0
1
0
1
1
1
1
1
1
F
1
0
0
0
1
1
1
0
1
1
1
1
1
0
1
1
G
0
0
1
1
1
1
1
0
1
1
1
1
0
1
1
1
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0
1
2
3
4
5
6
7
8
9
A
b
C
d
E
F
D
1
1
0
1
1
0
1
0
1
0
0
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D6:D4
X
X
X
X
X
X
X
X
X
X
X
On Segments = 1
†
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D7
†
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Register Data
7-Segment Character
The decimal point is enabled by setting bit D7 = 1.
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Table 12. No-Decode Mode Data Bits and Corresponding Segment Lines
D7
DP
D6
A
D5
B
D4
C
D3
D
D2
E
D1
F
D0
G
ch
Corresponding Segment Line
8.5.3
Display-Test Register (0xXF)
Te
The AS1106/AS1107 devices can operate in two modes: normal mode and display test mode. In display test mode all LEDs are switched on at
maximum brightness (duty cycle is 15/16 (AS1106) or 31/32 (AS1107). The devices remain in display-test mode until the Display-Test Register is
set for normal operation.
Note: All settings of the digit- and control-registers are maintained.
Table 13. Display-Test Register Format (Address (HEX) = 0xXF))
Mode
Normal Operation
Display Test Mode
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D7
X
X
D6
X
X
Revision 2.29
D5
X
X
Register Data
D4
D3
X
X
X
X
D2
X
X
D1
X
X
D0
0
1
11 - 20
AS1106, AS1107
Datasheet - D e t a i l e d D e s c r i p t i o n
8.5.4
Intensity Control Register (0xXA)
The brightness of the display can be controlled by digital means using the Intensity Control Register and by analog means using RSET (see
Selecting RSET Resistor Value and Using External Drivers on page 14).
Display brightness is controlled by an integrated pulse-width modulator which is controlled by the lower-nibble of the Intensity Control Register.
The modulator scales the average segment-current in 16 steps from a maximum of 31/32 down to 1/32 (15/16 to 1/16 for the AS1107) of the
peak current set by RSET.
8.5.5
D7
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0xX0
0xX1
0xX2
0xX3
0xX4
0xX5
0xX6
0xX7
0xX8
0xX9
0xXA
0xXB
0xXC
0xXD
0xXE
0xXF
D6
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
D5
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Register Data
D4
D3
X
0
X
0
X
0
X
0
X
0
X
0
X
0
X
0
X
1
X
1
X
1
X
1
X
1
X
1
X
1
X
1
D2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
D1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
D0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
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HEX Code
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Duty Cycle
AS1106
AS1107
1/32 (min on)
1/16 (min on)
3/32
2/16
5/32
3/16
7/32
4/16
9/32
5/16
11/32
6/16
13/32
7/16
15/32
8/16
17/32
9/16
19/32
10/16
21/32
11/16
23/32
12/16
25/32
13/16
27/32
14/16
29/32
15/16
31/32 (max on)
15/16 (max on)
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Table 14. Intensity Register Format (Address (HEX) = 0xXA))
Scan-Limit Register (0x0B)
The Scan-Limit Register controls which of the digits are to be displayed. When all 8 digits are to be displayed, the update frequency is typically
800Hz. If the number of digits displayed is reduced, the update frequency is increased. The frequency can be calculated using 8fOSC/N, where
N is the number of digits. Since the number of displayed digits influences the brightness, RSET should be adjusted accordingly. Table 16 lists the
maximum allowed current when fewer than 4 digits are used.
Note: To avoid differences in brightness this register should not be used to blank parts of the display (leading zeros).
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Table 15. Scan-Limit Register Format (Address (HEX) = 0xXB))
HEX Code
Display digit 0 only (see Table 16)
Display digits 0:1 (see Table 16)
Display digits 0:2 (see Table 16)
Display digits 0:3
Display digits 0:4
Display digits 0:5
Display digits 0:6
Display digits 0:7
0xX0
0xX1
0xX2
0xX3
0xX4
0xX5
0xX6
0xX7
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Scan Limit
D7
X
X
X
X
X
X
X
X
D6
X
X
X
X
X
X
X
X
D5
X
X
X
X
X
X
X
X
Register Data
D4
D3
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
D2
0
0
0
0
1
1
1
1
D1
0
0
1
1
0
0
1
1
D0
0
1
0
1
0
1
0
1
Table 16. Maximum Segment Current for 1-, 2-, or 3-Digit Displays
Number of Digits Displayed
1
2
3
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Maximum Segment Current (mA)
10
20
30
Revision 2.29
12 - 20
AS1106, AS1107
Datasheet - D e t a i l e d D e s c r i p t i o n
8.5.6
Feature Register (0xXE)
The Feature Register is used for enabling various features including switching the device into external clock mode, applying an external reset,
selecting code-B or HEX decoding, enabling or disabling blinking, enabling or disabling the SPI-compatible interface (AS1106 only), setting the
blinking rate, and resetting the blink timing.
Note: At power-up the Feature Register is initialized to 0.
D7
D6
D5
D4
D3
D2
D1
blink_
start
sync
blink_
freq_sel
blink_en
spi_en
decode_sel
reg_res
Table 18. Feature Register Bit Descriptions (Address (HEX) = 0xXE))
clk_en
D1
reg_res
D2
decode_sel
D3
spi_en
D4
blink_en
D5
blink_freq_sel
D6
sync
D7
blink_start
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D0
Feature Register
Enables and disables various device features.
Default
Access
Bit Description
External clock active.
0
R/W
0 = Internal oscillator is used for system clock.
1 = Pin CLK of the serial interface operates as system clock input.
Resets all control registers except the Feature Register.
0 = Reset Disabled. Normal operation.
1 = All control registers are reset to default state (except the Feature Register)
0
R/W
identically after power-up.
Note: The Digit Registers maintain their data.
Selects display decoding.
0 = Enable Code-B decoding (see Table 10 on page 10).
0
R/W
1 = Enable HEX decoding (see Table 11 on page 11).
Enables the SPI-compatible interface.
0 = Disable SPI-compatible interface (AS1106 only).
0
R/W
1 = Enable the SPI-compatible interface (AS1106 only).
Note: The SPI-compatible interface is always enabled in the AS1107.
Enables blinking.
0 = Disable blinking.
0
R/W
1 = Enable blinking.
Sets blink with low frequency (with the internal oscillator enabled):
0 = Blink period typically is 1 second (0.5s on, 0.5s off).
0
R/W
1 = Blink period is 2 seconds (1s on, 1s off).
Synchronizes blinking on the rising edge of pin LOAD/CSN. The multiplex and blink
timing counter is cleared on the rising edge of pin LOAD/CSN. By setting this bit in
0
R/W
multiple AS1106/AS1107 devices, the blink timing can be synchronized across all the
devices.
Start Blinking with display enabled phase. When bit D4 (blink_en) is set, bit D7
determines how blinking starts.
0
R/W
0 = Blinking starts with the display turned off.
1 = Blinking starts with the display turned on.
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Bit Name
clk_en
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Bit
D0
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Addr: 0xXE
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Table 17. Feature Register Summary
No-Op Register (0xX0)
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8.5.7
The No-Op Register is used when multiple AS1106 or AS1107 devices are cascaded in order to support displays with more than 8 digits. The
cascading must be done in such a way that all DOUT pins are connected to DIN of the next AS1106/AS1107 (see Figure 14 on page 16). The
LOAD/CSN and CLK signals are connected to all devices.
For example, if five devices are cascaded, in order to perform a write operation to the fifth device, the write-command must be followed by four
no-operation commands. When the LOAD/CSN signal goes high, all shift registers are latched. The first four devices will receive no-operation
commands and only the fifth device will receive the intended operation command, and subsequently update its register.
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Revision 2.29
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AS1106, AS1107
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
9 Application Information
9.1 Supply Bypassing and Wiring
In order to achieve optimal performance the AS1106/AS1107 should be placed very close to the LED display to minimize effects of
electromagnetic interference and wiring inductance.
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Furthermore, it is recommended to connect a 10µF electrolytic and a 0.1µF ceramic capacitor between pins VDD and GND to avoid power
supply ripple (see Figure 14 on page 16).
Note: Both GND pins must be connected to ground.
9.2 Selecting RSET Resistor Value and Using External Drivers
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Brightness of the display segments is controlled via RSET. The current that flows between VDD and ISET defines the current that flows through
the LEDs.
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Segment current is about 200 times the current in ISET. Typical values for RSET for different segment currents, operating voltages, and LED
voltage drop (VLED) are given in Tables 19 - 23. The maximum current the AS1106/AS1107 devices can drive is 40mA. If higher currents are
needed, external drivers must be used, in which case it is no longer necessary that the devices drive high currents.
In cases where the devices only drive a few digits, Table 16 specifies the maximum currents, and RSET must be set accordingly.
Note: The display brightness can also be logically controlled (see Intensity Control Register (0xXA) on page 12).
Table 19. RSET vs. Segment Current and LED Forward Voltage, VDD = 2.7V
VLED(V)
ISEG (mA)
1.5
5kΩ
6.9kΩ
10.7kΩ
22.2kΩ
40
30
20
10
2.0
4.4kΩ
5.9kΩ
9.6kΩ
20.7kΩ
Table 20. RSET vs. Segment Current and LED Forward Voltage, VDD = 3.3V
ISEG (mA)
VLED(V)
2.0
6.4kΩ
8.8kΩ
13.3kΩ
27.7kΩ
1.5
6.7kΩ
9.1kΩ
13.9kΩ
28.8kΩ
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40
30
20
10
2.5
5.7kΩ
8.1kΩ
12.6kΩ
26kΩ
Table 21. RSET vs. Segment Current and LED Forward Voltage, VDD = 3.6V
ch
40
30
20
10
1.5
7.5kΩ
10.18kΩ
15.6kΩ
31.9kΩ
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ISEG (mA)
VLED(V)
2.0
7.2kΩ
9.8kΩ
15kΩ
31kΩ
2.5
6.6kΩ
9.2kΩ
14.3kΩ
29.5kΩ
3.0
5.5kΩ
7.5kΩ
13kΩ
27.3kΩ
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Table 22. RSET vs. Segment Current and LED Forward Voltage, VDD = 4.0V
ISEG (mA)
40
30
20
10
1.5
8.6kΩ
11.6kΩ
17.7kΩ
36.89kΩ
2.0
8.3kΩ
11.2kΩ
17.3kΩ
35.7kΩ
www.austriamicrosystems.com/LED-Driver-ICs/AS1106_07
VLED(V)
2.5
7.9kΩ
10.8kΩ
16.6kΩ
34.5kΩ
Revision 2.29
3.0
7.6kΩ
9.9kΩ
15.6kΩ
32.5kΩ
3.5
5.2kΩ
7.8kΩ
13.6kΩ
29.1kΩ
14 - 20
AS1106, AS1107
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Table 23. RSET vs. Segment Current and LED Forward Voltage, VDD = 5.0V
VLED (V)
1.5
11.35kΩ
15.4kΩ
23.6kΩ
48.9kΩ
40
30
20
10
2.0
11.12kΩ
15.1kΩ
23.1kΩ
47.8kΩ
2.5
10.84kΩ
14.7kΩ
22.6kΩ
46.9kΩ
3.0
10.49kΩ
14.4kΩ
22kΩ
45.4kΩ
3.5
10.2kΩ
13.6kΩ
21.1kΩ
43.8kΩ
9.3 Calculating the Power Dissipation
The upper limit for power dissipation (PD) for the AS1106/AS1107 is determined from the following equation:
PD = (VDD x 1mA) + (VDD - VLED)(DUTY x ISEG x N)
(EQ 1)
lv
Where:
4.0
9.9kΩ
13.1kΩ
20.2kΩ
42kΩ
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ISEG (mA)
VDD is the supply voltage.
DUTY is the duty cycle set by intensity register (page 12).
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N is the number of segments driven (worst case is 8)
VLED is the LED forward voltage
ISEG = segment current set by RSET
Dissipation Example:
ISEG = 40mA, N = 8, DUTY = 31/32, VLED = 1.8V at 40mA, VDD = 5.25V
(EQ 2)
PD = 5.25V(1mA) + (5.25V - 1.8V)(31/32 x 40mA x 8) = 1.075W
(EQ 3)
Thus, for a PDIP package ΘJA = +75°C/W (from Table 24), the maximum allowed TAMB is given by:
TJ,MAX = TAMB + PD x ΘJA = 150°C = TAMB +1.07W x 75°C/W
Where:
TAMB = +69.4°C.
(EQ 4)
The TAMB limit for SO Packages in the dissipation example above is +58.6°C.
Table 24. Package Thermal Data
Thermal Resistance (ΘJA)
+85°C/W
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Package
24 Wide SOIC
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Revision 2.29
15 - 20
AS1106, AS1107
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
9.4 8x8 LED Dot Matrix Driver
The application example in Figure 14 shows the AS1106 as an 8x8 LED dot matrix driver.
The LED columns have common cathodes and are connected to the DIG0:7 outputs. The rows are connected to the segment drivers. Each of
the 64 LEDs can be addressed separately. The columns are selected via the digits as listed in Table 7 on page 9.
The Decode Enable Register (see page 10) must be set to ‘00000000’ as described in Table 9 on page 10. Single LEDs in a column can be
addressed as described in Table 12 on page 11, where bit D0 corresponds to segment G and bit D7 corresponds to segment DP.
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Note: For a multiple-digit dot matrix, multiple AS1106 devices must be cascaded.
8x8 LED Dot Matrix
Diode Arrangement
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Figure 14. Application Example as LED Dot Matrix Driver
8x8 LED Dot Matrix
SEG G
SEG G
SEG F
SEG E
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SEG F
SEG E
SEG D
SEG D
SEG C
SEG C
SEG B
SEG B
SEG A
SEG A
SEG DP
SEG DP
SEG A:G
SEG DP
AS1106/
AS1107
DIN
MicroProcessor
SEG A:G
SEG DP
DIG0:7
DOUT
VDD
LOAD/CSN
VBAT
9.53kΩ
CLK
AS1106/
AS1107
DIN
VDD
LOAD/CSN
VBAT
9.53kΩ
CLK
ISET
GND
GND
ISET
GND
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GND
DIG0:7
9.5 Cascading Drivers
The example in Figure 14 drives 2 dot matrix digits using a 4-wire microprocessor interface. All Scan-Limit Registers should be set to the same
value so that one display will not appear brighter than the other.
Te
For example, to display 12 digits, set both Scan-Limit Registers to display 6 digits so that both displays have a 1/6 duty cycle per digit. If 11 digits
are needed, set both Scan-Limit Registers to display 6 digits and leave one digit unconnected. Otherwise, if one driver is set to display 6 digits
and the other to display 5 digits one display will appear brighter because its duty cycle per digit will be 1/5 and the other display’s duty cycle will
be 1/6.
Note: Refer to No-Op Register (0xX0) on page 13 for additional information.
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Revision 2.29
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AS1106, AS1107
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
10 Package Drawings and Markings
Table 25. Packaging Code
YY
WW
manufacturing week
Q
plant identifier
ZZ
free choice / traceability code
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last two digits of the current year
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Figure 15. AS1106, AS1107 Marking
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Revision 2.29
17 - 20
AS1106, AS1107
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
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Figure 16. SOIC 24-pin Package
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Revision 2.29
18 - 20
AS1106, AS1107
Datasheet - O r d e r i n g I n f o r m a t i o n
11 Ordering Information
The AS1106 and AS1107 are available as the standard products shown in Table 26.
Table 26. Ordering Information
Description
8-Digit LED Display Drivers
8-Digit LED Display Drivers
8-Digit LED Display Drivers
8-Digit LED Display Drivers
8-Digit LED Display Drivers
8-Digit LED Display Drivers
Temperature Range
0 to +70°C
0 to +70°C
-40 to +85°C
-40 to +85°C
-40 to +85°C
-40 to +85°C
Delivery Form
Tubes
Tape and Reel
Tubes
Tape and Reel
Tubes
Tape and Reel
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Note: All products are RoHS compliant and austriamicrosystems green.
Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect
Package
SOIC 24-pin
SOIC 24-pin
SOIC 24-pin
SOIC 24-pin
SOIC 24-pin
SOIC 24-pin
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Marking
AS1106WL
AS1106WL
AS1106WE
AS1106WE
AS1107WL
AS1107WL
lv
Ordering Code
AS1106WL
AS1106WL-T
AS1106WE
AS1106WE-T
AS1107WL
AS1107WL-T
Technical Support is found at http://www.austriamicrosystems.com/Technical-Support
Te
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For further information and requests, please contact us mailto:[email protected]
or find your local distributor at http://www.austriamicrosystems.com/distributor
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Revision 2.29
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AS1106, AS1107
Datasheet
Copyrights
Copyright © 1997-2012, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®.
All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of
the copyright owner.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
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Disclaimer
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Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale.
austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding
the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at
any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for
current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range,
unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are
specifically not recommended without additional processing by austriamicrosystems AG for each application. For shipments of less than 100
parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location.
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The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not
be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use,
interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing,
performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of
austriamicrosystems AG rendering of technical or other services.
Headquarters
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Contact Information
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austriamicrosystems AG
Tobelbaderstrasse 30
A-8141 Unterpremstaetten, Austria
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Tel: +43 (0) 3136 500 0
Fax: +43 (0) 3136 525 01
For Sales Offices, Distributors and Representatives, please visit:
http://www.austriamicrosystems.com/contact
www.austriamicrosystems.com/LED-Driver-ICs/AS1106_07
Revision 2.29
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Mouser Electronics
Authorized Distributor
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