STM32001306
ST7590
Narrow-band OFDM power line networking
PRIME compliant system-on-chip
Features
■
Fully integrated narrow-band power line
networking system-on-chip
■
High performing DSP engine with embedded
turn-key firmware for Orthogonal frequency
division multiplexing (OFDM) modulation,
featuring:
– 96 sub-carriers in CENELEC A band
– BDPSK, QDPSK, 8DPSK programmable
modulations
– Programmable bit rate up to 128 kbps
– Convolutional coding and Viterbi decoding
– Signal to noise ratio and channel quality
estimation
– Full PRIME compliant PHY
■
On chip peripherals:
– Host controller UART/SPI interface
– I2C/SPI external data memory interface
– High speed SRAM controller for optional
external SRAM program code execution
– Watchdog timer
■
On chip 128 bit AES encryption HW block
■
Fully integrated analog front end:
– ADC and DAC
– High sensitivity receiver
– High linearity transmitter with intelligent
gain control
■
Fully integrated power line driver
– Up to 1 Arms, 14 Vpp single ended
– Configurable active filtering topology
– Ultra low distortion
– Embedded temperature sensor
– Current control
■
3.3 V or 5 V I/O digital I/O supply
■
Integrated 5 V and 1.8 V linear regulators for
AFE and digital core supply
■
8 V to 18 V line driver power supply
October 2011
41&0
QFN-48
(7 x 7 mm)
■
Suitable for applications compliant with
EN50065 and FCC part 15 specifications
■
-40 °C to +85 °C temperature range
■
QFN48 7x7 (ST7590) and TQFP 100 14x14
(ST7590T) exposed pad package options
Application
PRIME compliant smart metering and smart grid
applications.
Description
ST7590 is the first complete Narrowband OFDM
power line communication system-on-chip made
using a multi-power technology with state of the
art VLSI CMOS lithography. The ST7590 is based
on dual core architecture to assure outstanding
communication performance with a very high level
of flexibility and programmability for either open
standard or fully customized implementations.
Doc ID 18349 Rev 1
1/24
www.st.com
24
Contents
ST7590
Contents
1
Device description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4
3.1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Analog front end (AFE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1
Reception path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2
Transmission path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.3
Power amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.4
Thermal shutdown and temperature control . . . . . . . . . . . . . . . . . . . . . . . 15
4.5
Zero-crossing detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.6
One time programmable (OTP) memory array . . . . . . . . . . . . . . . . . . . . . 16
4.7
Power management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.8
Clock management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2/24
Doc ID 18349 Rev 1
ST7590
1
Device description
Device description
ST7590 is available in two different package options: TQFP100 and QFN48.
In the TQFP100 package option, order code ST7590T, the device comes with a dedicated
FW implementing PRIME compliant PHY protocol Layer and a boot loader procedure that
enables the IC to boot PRIME MAC, PRIME CL432 Convergence Layer and IEC 61334-432 LLC Layer from an external Serial NV memory connected through SPI interface.
In the QFN 48 package option, ST7590 comes with a dedicated FW implementing the full
PRIME protocol stack (PHY, MAC and Convergence Layer), so without the need for external
memories to run the protocol.
The on-chip analog front end, featuring analog to digital and digital to analog conversion and
automatic gain control, plus the integrated power amplifier delivering up to 1 Arms (typical)
output current, makes the ST7590 the first complete Narrowband OFDM power line
communication system-on-chip ideal for PRIME compliant applications.
An HW 128-bit AES encryption block with PRIME compliant management is available on
chip when secure communication is requested.
Line coupling network design is also extremely simplified, leading to a very low cost Bill Of
Material.
Safe operations are assured while keeping power consumption and distortion levels very
low, so making ST7590 an ideal platform for the most stringent application requirements and
regulatory standards compliance.
Figure 1.
ST7590 block diagram
PA_INPA_IN+
CL
Thermal
Management
PA_OUT
P_ROM
X-RAM
Y-RAM
Ouptut Current
Control
DSP
Engine
DAC
GAIN
Optional Program
SRAM
NVM SPI
SRAM Contr.
OTP
UART/SPI0
AES128
Line Driver
TX_OUT
Optional External
FLASH Memory
10 GPIO
8051
Watchdog
CORE
3 Timers
BPF
DATA
RAM
RX_IN
PGA
BPF
ADC
AFE
VCC
(8-18V)
VCCA
(5V)
VDDIO
(3.3/5V)
VDD
(1.8V)
2 Interrupts
PROG
ROM
Hardware
Accelerators
PROTOCOL
Controller
PHY Processor
POWER Management
JTAG
Zero Crossing Detector
ZC_IN
Doc ID 18349 Rev 1
CLOCK Management
VDD_PLL
XIN XOUT
3/24
Pin connection
Pin connection
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33.
TQFP100 pin connection
3#,+
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QFN48(a) pin connection
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a. The QFN48 package option does not allow the connection with an external memory; in this configuration the
ST7590 will run the code present in the embedded ROM only.
4/24
Doc ID 18349 Rev 1
ST7590
Table 1.
Pin connection
Pin description
Pin
Name
Type
Description
TQFP QFN
SCLK0
100
48
Digital input
SPI0 serial clock
SSN0
99
47
Digital input
SPII0 slave select (active low)
VDD
98
46
Power
Digital power supply (1.8 V)
GND
97
45
Power
Ground
MISO1
96
44
Digital input
MOSI1_SDA
95
43
Digital I/O
SRAM_A15
94
-
VDDIO
93
-
SRAM_A16
92
-
SCLK1_SCL
91
42
SRAM_D0
90
-
Digital I/O (1)
External SRAM data I/O
-
Digital I/O
(1)
External SRAM data I/O
Digital I/O
(1)
External SRAM data I/O
(1)
External SRAM data I/O
SRAM_D1
SRAM_D2
89
88
-
SPI1 data in
SPI1 data out, I2C data in (I2C always selected at boot)
Digital output External SRAM Address
Power
3.3 V - 5 V I/O supply
Digital output External SRAM Address
Digital output SPI1 serial clock, I2C serial clock ((I2C always selected at boot)
SRAM_D3
87
-
Digital I/O
SRAM_D4
86
-
Digital I/O (1)
External SRAM data I/O
-
Digital I/O
(1)
External SRAM data I/O
Digital I/O
(1)
External SRAM data I/O
(1)
External SRAM data I/O
SRAM_D5
SRAM_D6
85
84
-
SRAM_D7
83
-
Digital I/O
SRAM_CSN
82
-
Digital output External SRAM chip select
SRAM_WEN
81
-
Digital output External SRAM write enable
SRAM_OEN
80
-
Digital output External SRAM output enable
GPIO0
79
41
Digital I/O
General purpose I/O
GPIO1
78
40
Digital I/O
General purpose I/O
GPIO2
77
39
Digital I/O
General purpose I/O
VDDIO
76
-
Power
3.3 V - 5 V I/O supply
GPIO3
75
38
Digital I/O
General purpose I/O
N.C
74
-
GPIO4
73
37
N.C
72
-
GPIO5
71
36
Digital I/O
VDD_12V
70
35
Power
OTP programming voltage (12 V)
VDD
69
-
Power
Digital power supply (1.8 V)
VDDIO
68
34
Power
3.3 V - 5 V I/O supply
GND
67
33
Power
Ground
Not connected
Digital I/O
General purpose I/O
Not connected
General purpose I/O
Doc ID 18349 Rev 1
5/24
Pin connection
Table 1.
ST7590
Pin description (continued)
Pin
Name
Type
Description
TQFP QFN
GPIO6
66
32
Digital I/O
General purpose I/O
GPIO7
65
31
Digital I/O
General purpose I/O
VSUBS
64
-
Power
GPIO8
63
30
Digital I/O
VDD
62
-
Power
GPIO9
61
29
Digital I/O
VSUBS
60
-
Power
Substrate ground
VDDIO
59
28
Power
3.3 V - 5 V I/O supply
GND
58
-
Power
Ground
N.C
57
-
VDD
56
-
N.C
55
-
VDD_REG_1V8
54
27
N.C
53
-
PA_OUT
52
26
Analog output Power amplifier output
PA_OUT
51
-
Analog output Power amplifier output
VSS
50
25
Power
Power ground
VSS
49
-
Power
Power ground
N.C
48
-
VCC
47
24
Power
12 V to 20 V power supply
VCC
46
-
Power
12 V to 20 V power supply
CL
45
23
Analog Input
Current limiting feedback
PA_IN_N
44
22
Analog Input
Power amplifier inverting input
PA_IN_P
43
21
Analog Input
Power amplifier non-inverting input
TX_OUT
42
20
RX_IN
41
19
Analog Input
Reception analog input
ZC_IN
40
18
Analog Input
Zero crossing detection input
VCCA
39
17
Power
5 V analog supply, internal regulator output
VDD_PLL
38
16
Power
1.8 V PLL supply voltage
N.C
37
-
Not connected
N.C
36
-
Not connected
VSSA
35
15
N.C
34
-
GND
33
14
6/24
Analog ground
General purpose I/O
Digital power supply (1.8 V)
General purpose I/O
Not connected
Power
Digital power supply (1.8 V)
Not connected
Power
1.8 V digital power supply, internal regulator output
Not connected
Not connected
Analog Output Transmission analog output
Power
Analog ground
Not connected
Power
Ground
Doc ID 18349 Rev 1
ST7590
Table 1.
Pin connection
Pin description (continued)
Pin
Name
Type
Description
TQFP QFN
XOUT
32
13
Analog
Crystal oscillator output
XIN
31
12
Analog
Crystal oscillator input
N.C
30
-
Not connected
N.C
29
-
Not connected
VDD
28
11
N.C
27
-
RESETN
26
10
Power
Digital power supply (1.8 V)
Not connected
Digital input
(1)
System reset (active low)
TDI
25
9
Digital input
System/M851EW JTAG interface data in
TDO
24
8
Digital I/O
TCK
23
7
Digital input
GND
22
6
Power
Ground
VDDIO
21
-
Power
3.3 V - 5 V I/O supply
SRAM_A0
20
-
Digital output External SRAM address
SRAM_A1
19
-
Digital output External SRAM address
SRAM_A2
18
-
Digital output External SRAM address
SRAM_A3
17
-
Digital output External SRAM address
SRAM_A4
16
-
Digital output External SRAM address
SRAM_A5
15
-
Digital output External SRAM address
SRAM_A6
14
-
Digital output External SRAM address
SRAM_A7
13
-
Digital output External SRAM address
SRAM_A8
12
-
Digital output External SRAM address
SRAM_A9
11
-
Digital output External SRAM address
SRAM_A10
10
-
Digital output External SRAM address
SRAM_A11
9
-
Digital output External SRAM address
SRAM_A12
8
-
Digital output External SRAM address
SRAM_A13
7
-
Digital output External SRAM address
SRAM_A14
6
-
Digital output External SRAM address
TMS
5
5
Digital input (1) System/M8051EW JTAG interface test mode selection
TRSTN
4
4
Digital input (1) System/M8051EW JTAG interface reset (active low)
VDDIO
3
3
Power
MISO0_RXD
2
2
Digital I/O
UART data in, SPI0 data out
MOSI0_TXD
1
1
Digital I/O
UART data out, SPI0 data in
System/M851EW JTAG interface data out
System/M851EW JTAG interface clock
3.3 V - 5 V I/O supply
1. Active Pull up (only in input mode for bi-directional pins)
Doc ID 18349 Rev 1
7/24
Maximum ratings
ST7590
3
Maximum ratings
3.1
Absolute maximum ratings
Table 2.
Absolute maximum ratings
Value
Symbol
Parameter
VCC
VSSA-GND
VDDIO
Max
Power supply voltage
-0.3
20
V
Voltage between VSSA and GND
-0.3
0.3
V
I/O supply voltage
-0.3
5.5
V
VI
Digital input voltage
GND-0.3
VDDIO+0.3
V
VO
Digital output voltage
GND-0.3
VDDIO+0.3
V
V(PA_IN)
PA inputs voltage range
VSS-0.3
VCC+0.3
V
V(PA_OUT)
PA_OUT voltage range
VSS-0.3
VCC+0.3
V
VCC+0.3
V
V(RX_IN)
RX_IN voltage range
-(VCCA+0.3)
V(ZC_IN)
ZC_IN voltage range
-(VCCA+0.3) VCCA+0.3
V(TX_OUT, CL) TX_OUT, CL voltage range
V(XIN)
XIN voltage range
V
VSSA-0.3
VCCA+0.3
V
GND-0.3
VDDIO+0.3
V
I(PA_OUT)
Power amplifier output non-repetitive peak
current
5
Apeak
I(PA_OUT)
Power amplifier output non-repetitive rms
current
1.4
Arms
Tamb
Operating ambient temperature
-40
85
ºC
Tstg
Storage temperature
-50
150
ºC
Maximum withstanding voltage range
test condition: cdf-aec-q100-002 “human body
model” acceptance criteria: “normal
performance”
-2
+2
kV
V(ESD)
3.2
Unit
Min
Thermal data
Table 3.
Thermal characteristics (1)
Symbol
Parameter
QFN48 TQFP100
RthJA1
Maximum thermal resistance junction-ambient steady
58
50
°C/W
RthJA2
Maximum thermal resistance junction-ambient steady state(3)
32
25
°C/W
1. Typical values.
2. Mounted on a 2s PCB.
3. Mounted on a 2s2p PCB, with a dissipating surface, connected through vias, on the bottom side of the
PCB.
8/24
Unit
state(2)
Doc ID 18349 Rev 1
Electrical characteristics
TA = -40 to +85 °C, TJ < 125 °C, VCC = 18 V unless otherwise specified.
Table 4.
Electrical characteristics
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
8
13
18
V
0.35
0.5
mA
22
30
mA
Maximum ratings
9/24
3.3
Power supply
VCC
Power supply voltage
I(VCC) RX
Power supply current - Rx mode
I(VCC) TX
Power supply current - Tx mode, no load
VCC UVLO_TL
VCC under voltage lock out low threshold
6.1
6.5
6.95
V
VCC UVLO_TH
VCC under voltage lock out high threshold
6.8
7.2
7.5
V
VCCA externally supplied
Doc ID 18349 Rev 1
VCC UVLO_HYST VCC under voltage lock out hysteresis
VCCA
Analog supply voltage
250
Externally supplied
(1)
-5%
700
mV
5
+5%
V
5
6
mA
8
10
mA
1.8
+10%
V
I(VCCA) RX
Analog supply current - Rx mode
I(VCCA) TX
Analog supply current - Tx mode
V(TX_OUT) =5 V p-p, No load
VDD
Digital core supply voltage
Externally supplied
I(VDD)
Digital core supply current
35
mA
I(VDD)
Digital core supply current in RESET state
8
mA
-10%
VDD_PLL
PLL supply voltage
VDD
V
I(VDD_PLL)
PLL supply current
0.4
mA
VDDIO
Digital I/O supply voltage
Externally supplied
-10%
3.3 or 5
+10%
V
VDDIO UVLO_TL
I/O supply voltage under voltage lock out low
threshold
2.25
2.4
2.6
V
VDDIO UVLO_TH
I/O supply voltage under voltage lock out high
threshold
2.45
2.6
2.8
V
UVLO_HYST
I/O supply voltage under voltage lock out
hysteresis
250
mV
ST7590
VDDIO
Electrical characteristics (continued)
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
Analog front end
Power amplifier
V(PA_OUT)BIAS
Power amplifier output bias voltage - Rx mode
GBWP
Power amplifier gain-bandwidth product
I(PA_OUT)MAX
Power amplifier maximum output current
Doc ID 18349 Rev 1
Power amplifier output tolerance
V(PA_OUT) HD2
Transmitter output 2nd harmonic distortion
V(PA_OUT) HD3
rd
Transmitter output 3 harmonic distortion
V(PA_OUT) THD
Transmitter output total harmonic distortion
V(PA_OUT) HD2
Transmitter output 2nd harmonic distortion
V(PA_OUT) HD3
Transmitter output
V(PA_OUT) THD
Transmitter output total harmonic distortion
C(PA_IN)
PSRR
CL_TH
CL_RATIO
harmonic distortion
Power amplifier input capacitance
MHz
1000
-3%
mA rms
3%
VCC=13 V, V(PA_OUT) = 7 V p-p,
V(PA_OUT) BIAS = VCC/2,
RLOAD=50 Ω
see Figure 4
-71
dBc
-68
dBc
0.1
%
VCC=18 V, V(PA_OUT) = 14 V p-p,
V(PA_OUT) BIAS = VCC/2,
RLOAD=50 Ω
see Figure 4
-70
dBc
-60
dBc
0.2
%
PA_IN+ vs. VSS (2)
10
pF
(2)
10
pF
dc to 3 kHz
100
dB
1 kHz
93
dB
100 kHz
70
dB
2.35
V
PA_IN- vs. VSS
Power supply rejection ratio
V
100
(2)
V(PA_OUT) TOL
3rd
VCC/2
Current sense high threshold on CL pin
Ratio between PA_OUT and CL output current
Maximum ratings
10/24
Table 4.
80
Transmitter
V(TX_OUT) BIAS Transmitter output bias voltage - Rx mode
V(TX_OUT) MAX Transmitter output maximum voltage swing
Transmitter output digital gain range
TX_GAIN TOL Transmitter output digital gain tolerance
Maximum output level, no load
VCCA = 5 V
4.8
4.95
V
VCCA
V p-p
-21
0
dB
-0.35
0.35
dB
ST7590
TXGAIN
VCCA/2
Electrical characteristics (continued)
Symbol
R(TX_OUT)
V(TX_OUT) HD2
Parameter
Transmitter output resistance
nd
Transmitter output 2
Test conditions
Min.
RX mode
harmonic distortion
V(TX_OUT) HD3
Transmitter output 3rd harmonic distortion
V(TX_OUT) THD
Transmitter output total harmonic distortion
V(TX_OUT) = 4 Vpp (TXOUT)MAX,
No load, fC = 82 kHz
Typ.
Max.
Unit
1
kΩ
-67
dBc
-70
dBc
0.1
%
16
V p-p
ST7590
Table 4.
Receiver
Doc ID 18349 Rev 1
V(RX_IN) MAX
Receiver input maximum voltage
VCC = 18 V
V(RX_IN) BIAS
Receiver input bias voltage
2.5
V
Z(RX_IN)
Receiver input impedance
10
kΩ
PGA_MIN
PGA minimum gain
-18
dB
PGA_MAX
PGA maximum gain
30
dB
Oscillator
V(XIN)
V(XIN) TH
Oscillator input voltage swing
Oscillator input voltage threshold
V(XIN) fOSC
Crystal oscillator frequency
F(XIN) TOL
External quartz crystal frequency tolerance
ESR
CL
Clock frequency supplied externally
0.8
1.8
VDDIO
V p-p
0.9
1
V
8
-150
External quartz crystal ESR value
External quartz crystal load capacitance
MHz
150
ppm
100
Ω
16
pF
Temperature sensor
T_TH1
T_TH3
T_TH4
(2)
63
70
77
°C
Temperature threshold 2
(2)
90
100
110
°C
Temperature threshold 3
(2)
112
125
138
°C
Temperature threshold 4
(2)
153
170
187
°C
10
V p-p
Zero crossing comparator
11/24
V(ZC_IN) MAX
Zero crossing detection input voltage range
Maximum ratings
T_TH2
Temperature threshold 1
Electrical characteristics (continued)
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
V(ZC_IN) TL
Zero crossing detection input low threshold
-44
-32
-17
mV
V(ZC_IN) TH
Zero crossing detection input high threshold
26
41
56
mV
V(ZC_IN) HYST
Zero crossing detection input hysteresis
73
mV
Maximum ratings
12/24
Table 4.
Digital section
Digital I/O
RPULL-UP
VDDIO = 3.3 V
66
VDDIO = 5 V
41
kΩ
Internal pull-up resistors
Doc ID 18349 Rev 1
VIH
High logic level input voltage
0.65*VDDIO
VDDIO+0.3
V
VIL
Low logic level input voltage
-0.3
0.35*VDDIO
V
VOH
High logic level output Voltage
IOH= -4 mA
VOL
Low logic level output voltage
IOL= 4 mA
VDDIO-0.4
V
0.4
V
UART interface
Data bits
8
Bits
Stop bits
1
Bits
Parity bits
0
Bits
-1.5%
57600
+1.5%
BAUD
-1.5%
38400
+1.5%
BAUD
-1.5%
19200
+1.5%
BAUD
-1.5%
9600
+1.5%
BAUD
Baud rate
Reset and power on
tRESETN
tSTARTUP
Minimum valid reset pulse duration
Start-up time at power on or after a reset event
µs
1
(3)
2. This parameter does not include the tolerance of external components
3. Referred to IC start up, uploading code from external NVM and its execution from external RAM may require some second.
60
ms
ST7590
1. Referred to TA = -40°C
35
ST7590
Maximum ratings
Figure 4.
Power amplifier test circuit
R1
R2
4k
15k
VC C
C1
R3
330k
VC C
PA_IN_N
PA_IN_P
S IG N A L S O U R C E
C2
PA_OUT
10n
R4
330k
Doc ID 18349 Rev 1
1u
R _LO A D
50R
13/24
Analog front end (AFE)
ST7590
4
Analog front end (AFE)
4.1
Reception path
Figure 5 shows the block diagram of the ST7590 input receiving path. The reception AFE
main blocks are a wide input range analog PGA (programmable gain amplifier) and the ADC
(analog to digital converter).
Figure 5.
Reception path block diagram
28!&% 28?).
0'!
!$#
"0&
!-V
The PGA is controlled by a loop algorithm that detects the amplifier output signal amplitude
and adapts the gain of the amplifier in order to have the optimum input voltage range for the
ADC. The PGA gain ranges from -18 dB up to 30 dB (typical), with steps of 6 dB (typical), as
described in Table 5.
Table 5.
PGA gain table
PGA code
14/24
PGA gain (typical)
RX_IN max range
[dB]
[V p-p]
0
-18
16
1
-12
8
2
-6
4
3
0
2
4
6
1
5
12
0.500
6
18
0.250
7
24
0.125
8
30
0.0625
Doc ID 18349 Rev 1
ST7590
4.2
Analog front end (AFE)
Transmission path
Figure 6 shows the transmission path block diagram. It is mainly based on a digital to analog
converter (DAC), capable to generate a very linear signal up to its full scale output. A gain
control block before the DAC gives the possibility to scale down the output signal to match
the desired transmission level.
Figure 6.
Transmission path block diagram
48!&% $!#
48?/54
'AIN
#ONTROL
48'!).
"0&
!-V
According to PRIME Specifications the output level can be set on a 8-step logarithmic scale
between a Maximum Output Level (MOL) and a minimum output level (MOL - 21dB), with
steps of 3dB (typical). The maximum level corresponds to the TX_OUT full range.
4.3
Power amplifier
The integrated Power Amplifier is characterized by very high linearity, required to comply
with the different international regulations (CENELEC, FCC etc.) limiting the spurious
conducted emissions on the mains, and a current capability of 1Arms (typical) that allows
the amplifier driving even very low impedance points of the network.
All pins of the Power Amplifier are accessible, making it possible to build an Active Filter
network to increase the linearity of the output signal.
4.4
Thermal shutdown and temperature control
The ST7590 performs an automatic shutdown of the power amplifier circuitry when the
internal temperature exceeds 170 °C. After a Thermal shutdown event, the temperature
must get below 125 °C before the ST7590 power amplifier comes back to operation.
Moreover a digital thermometer is embedded to identify the internal temperature among four
zones, as indicated in Table 6.
Table 6.
Temperature zones
Temperature zone
Temperature range (Typ.)
1
T < T_TH1
2
T_TH1 < T < T_TH2
3
T_TH2 < T < T_TH3
4
T > T_TH3
Doc ID 18349 Rev 1
15/24
Analog front end (AFE)
4.5
ST7590
Zero-crossing detector
The ST7590 embeds an analog comparator with hysteresis, used for zero-crossing
detection. Information about zero crossing events is managed as specified in PRIME
protocol specifications.
4.6
One time programmable (OTP) memory array
ST7590 comes with an embedded 64 bit OTP array. This OTP memory is used to store
hardware trimming values and the unique identifier EUI48, used for unique addressing in
PRIME MAC protocol.
OTP array is composed of 4 16 bit words, indexed from 0 to 3, where the first (index 0)
contains hardware trimming values, while the others contain the EUI48 address as specified
in Table 7.
Table 7.
OTP memory array
Index
LSB
0
4.7
MSB
Reserved – hardware trimming
1
EUI48[0..7]
EUI48[8..15]
2
EUI48[16..23]
EUI48[24..31]
3
EUI48[32..39]
EUI48[40..47]
Power management
Figure 7 shows the power supply structure for the ST7590. The ST7590 operates from two
external supply voltages:
●
VCC (8 to 18 V) as the main power supply;
●
VDDIO (3.3 or 5 V) for the I/O and digital sections.
Two internal linear regulators provide the remaining required voltages:
●
5 V regulator (used by the analog front end blocks), generated from the VCC voltage
and connected to the VCCA pin;
●
1.8 V regulator (required for the DSP and microcontroller cores, the digital blocks, the
PLL and the oscillator), generated from the VDDIO voltage and connected to the
VDD_REG_1V8 pin.
All the supply voltages must be properly filtered, to their respective ground, using external
capacitors close to each supply pin (see Figure 7).
Note:
16/24
The internal regulators connected to VDD_REG_1V8 and VCCA are not designed to supply
external circuitry; their output is externally accessible for filtering purpose only.
Doc ID 18349 Rev 1
ST7590
Analog front end (AFE)
Figure 7.
Power supply internal scheme
8-18V
External Supply
VCC
POWER AMPLIFIER
LDO
AFE
VSS
VCCA
VSSA
3.3 or 5V
External Supply
VDDIO
DIGITAL INTERFACES
LDO
DIGITAL CORE
GND
VDD
VDD_PLL
INTERNAL PLL
VSSA
4.8
Clock management
The main clock source is an 8 MHz crystal connected to the internal oscillator through XIN
and XOUT pins. Both XIN and XOUT pins have a 32 pF integrated capacitor, in order to
drive a crystal having a load capacitance of 16 pF with no additional components.
Alternatively, an 8 MHz external clock can be directly supplied to XIN pin, leaving XOUT
floating.
A PLL internally connected to the output of the oscillator generates the internal clocks
needed by the digital part.
Doc ID 18349 Rev 1
17/24
Application information
5
ST7590
Application information
Figure 8.
TQFP100 128 Kb external memory application example
VCC
VDDIO
Switched Mode
Power Supply
EMC
Filter
RXD
TXD
RESETn
PA_IN+
GPIO6
PA_INTX_OUT
SCLK1
Serial
Non Volatile
Memory
MISO1
ST7590
PA_OUT
MOSI1
GPIO1
TQFP100
RX_IN
SRAM_A0..16
ZC_IN
SRAM_D0..7
Parallel
Asynchronous
RAM memory
Power Amplifier
Feedback
PHASE
NEUTRAL
HOST
Controller
Power Line
Interface
Zero Crossing
Conditioning
SRAM_OEN
SRAM_WEN
SRAM_CSN
Figure 9.
QFN48 application example
VCC
VDDIO
Switched Mode
Power Supply
EMC
Filter
PA_INTX_OUT
RXD
HOST
Controller
TXD
ST7590
PA_OUT
RESETn
GPIO6
QFN48
RX_IN
ZC_IN
18/24
Doc ID 18349 Rev 1
Power Amplifier
Feedback
Power Line
Interface
Zero Crossing
Conditioning
PHASE
NEUTRAL
PA_IN+
ST7590
6
Package mechanical data
Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK is an ST trademark.
Table 8.
TQFP 100 package mechanical data
(mm)
Dim.
Min.
Typ.
A
Max.
1.2
A1
0.05
0.15
A2
0.95
1
1.05
b
0.17
0.22
0.27
c
0.09
D
15.8
16
16.2
D1
13.8
14
14.2
D2
5.00
5.50
D3
12
0.2
E
15.8
16
16.2
E1
13.8
14
14.2
E2
5.00
5.50
E3
12
e
0.5
L
0.45
L1
k
0.6
0.75
1
0
ccc
3.5
7
0.08
Doc ID 18349 Rev 1
19/24
Package mechanical data
ST7590
Figure 10. TQFP 100 package outline
20/24
Doc ID 18349 Rev 1
ST7590
Package mechanical data
Table 9.
QFN-48 (7 x 7 mm) package mechanical data
(mm)
Dim.
Min.
Typ.
Max.
0.80
0.90
1.00
A1
0.02
0.05
A2
0.65
1.00
A3
0.25
A
b
0.18
0.23
0.30
D
6.85
7.00
7.15
D2
4.95
5.10
5.25
E
6.85
7.00
7.15
E2
4.95
5.10
5.25
e
0.45
0.50
0.55
L
0.30
0.40
0.50
ddd
0.08
Doc ID 18349 Rev 1
21/24
Package mechanical data
ST7590
Figure 11. QFN-48 (7 x 7 mm) package outline
22/24
Doc ID 18349 Rev 1
ST7590
7
Revision history
Revision history
Table 10.
Document revision history
Date
Revision
19-Oct-2011
1
Changes
Initial release
Doc ID 18349 Rev 1
23/24
ST7590
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Doc ID 18349 Rev 1
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