ST STEVAL-DIGAFEV1 User manual

Introduction
The STEVAL-DIGAFEV1 allows to evaluate the measurement performance and features of the TSC1641, designed to measure
current, voltage and power.
The board can accept external voltage and current to measure and evaluate the conversion performance of the TSC1641
conversion performance, based on its Delta-Sigma (ΔΣ) modulators.
Thanks to a led on the board, it is easy to monitor if the alert pin is active.
The STEVAL-DIGAFEV1 can be supplied in standalone mode. It can also be connected to a NUCLEO-H503RB development
board that hosts an STM32 microcontroller, allowing further signal processing and communication with the PC.
Figure 1. STEVAL-DIGAFEV1 reference design kit
Getting started with the STEVAL-DIGAFEV1 evaluation board for the TSC1641
UM3202
User manual
UM3202 - Rev 1 - August 2023
For further information contact your local STMicroelectronics sales office. www.st.com

1 Getting started
1.1 Features
• 16 bit dual channel for current, voltage, and power monitoring
• Temperature monitoring
• Simple digital connection with I²C up to 1MHz and compatible with MIPI I3C up to 12.5MHz
• From 128µs to 32.768ms total conversion time
• 2.7 to 3.6 V power supply
• Alert signals generated in case of over/under voltage, over/under current, overpower or over temperature
• Load voltage sensing from 0 to 60 V
1.2 Main component
1.2.1 TSC1641
The TSC1641 is a high precision current, voltage, power, and temperature monitoring analog front-end (AFE). It
monitors current into a shunt resistor and load voltage up to 60 V in a synchronized way.
The current measurement can be high-side, low-side and bidirectional.
The device integrates high precision 16-bit dual channel ADC with a programmable conversion time from 128 µs
to 32.7 ms.
The digital bus interface is flexible from an I²C/SMbus 1 MHz data rate to an MIPI I3C 12.5 MHz data rate. This
allows connectivity to most of the recent STM32 products.
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Getting started
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2 How to use the board
2.1 Standalone
The STEVAL-DIGAFEV1 can be used directly with your testing device or I2C/I3C controller.
Step 1. Connect ground and supply voltage
On the CN1 connector, connect your supply voltage according to the board serigraphy.
Figure 2. CN1 connector for 3.3V power supply
UM3202
How to use the board
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Step 2. Connect the I2C/I3C bus
On connector CN2, the two top connections are for SDA (data) and SCL (clock).
Connections are clearly labeled in the serigraphy.
Figure 3. CN2 connector for I2C/I3C connection
I²C
I²C communication bus requires pull-up resistors. The STEVAL-DIGAFEV1 has two 4.7k ohm pull-up
resistors on SDA and SCL lines.
These pull-up resistors can be connected thanks to JP_SDA and JP_SDL jumpers.
Figure 4. Jumpers to connect SDA and SCL pull-up resistors
It is also needed to give to the TSC1641 a static address by changing the with the A0/A1 value thanks
to JP_A0 and JP_A1 jumpers.
UM3202
Standalone
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Figure 5. Jumpers to set I²C static address
Table 1. Table of static addresses and I3C PIDs
A1 A0 Target address
(binary) Target address (h) Provisional ID (PID) value (h)
GND GND 1000000 40 0208020A0001
GND VS 1000001 41 0208020A1001
VS GND 1000010 42 0208020A2001
VS VS 1000011 43 0208020A3001
I3C
I3C communications do not require pull-up resistors, hence JP_SDA and JP_SDL jumpers must be
unplugged.
The maximum communication speeds are detailed table for I²C & I3C speeds.
Table 2. Table for I²C & I3C speeds
Communication type Speed
I²C 1 MHz
I3C 12.5 MHz
Step 3. Connect load and Vload power to supply
For high-side measurement, connect your power supply (the vload to measure) to the J1 connector,
and the load to the J2 connector.
Figure 6. J1 and J2 connectors for LOAD connection
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Standalone
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2.2 With a NUCLEO-STM32
To use the board, follow below procedure:
Step 1. Plug the STEVAL-DIGAFEV1
The STEVAL-DIGAFEV1 is compatible with the wide majority of Nucleo board thanks to its Arduino
pinout.
Connecting the STEVAL-DIGAFEV1 to a nucleo make it supplied by the 3.3V of the nucleo board.
For a better interconnection, it is better to use the NUCLEO-H503RB which support I3C
communications.
Table 3. Table for the connection to the NUCLEO-H503RB
NUCLEO-H503RB STEVAL-DIGAFEV1 SPI pin
PB8 SCLK
PB9 SDA (data)
PA10 ALERT/CVRDY
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With a NUCLEO-STM32
UM3202 - Rev 1 page 6/18

3 Communication with the TSC1641
Option A: use the STSW-DIGAFEV1 GUI
The STEVAL-DIGAFEV1 can be used with the STSW-DIGAFEV1GUI. It is necessary to program the nucleo-64
H503RB with the STSW-DIGAFEV1FW to use it.
The STSW-DIGAFEV1FW runs on an STM32 Nucleo-64 development board NUCLEO-H503RB. It communicates
with the TSC1641 of the STEVAL-DIGAFEV1 through the I2C and I3C protocols.
The STSW-DIGAFEV1GUI allows the user to write configuration registers, monitor current, voltage, and power
and plot data on a graph. It is also a tool to save values measured by the TSC1641 in a .csv file.
For more information on the STSW-DIGAFEV1GUI, go to the relevant ST web page.
Figure 7. STSW-DIGAFEV1GUI graphical user interface
Option B: use the STEVAL-DIGAFEV1 directly with your test solution
The STEVAL-DIGAFEV1 can be plugged directly to your solution.
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Communication with the TSC1641
UM3202 - Rev 1 page 7/18

The I2C/I3C communication to access the TSC1641 registers is shown in the table:
Table 4. Map register of the TSC1641
Pointer
address
(hex)
Register
name Type Default value Reset after POR
Reset after
Shutdown
mode
Reset after
Idle mode
Reset after
RST
00h Configuration
register R/W 0037h yes no no yes
01h Shunt voltage
register R 0000h yes no no yes
02h Load voltage
resister R 0000h yes no no yes
03h DC power
register R 0000h yes no no yes
04h Current
register R 0000h yes no no yes
05h Temperature
register R 8000 h yes no no yes
06h Mask register R/W 0000h yes no no yes
07h Flags register R 0000h yes no no yes
08h Rshunt
register R/W 0000h yes no no no
09h SOL alert limit
register R/W 0000h yes no no no
0Ah SUL alert limit
register R/W 0000h yes no no no
0Bh LOL alert limit
register R/W 0000h yes no no no
0Ch LUL alert limit
register R/W 0000h yes no no no
0Dh POL alert limit
register R/W 0000h yes no no no
0Eh TOL alert limit
register R/W 0000h yes no no no
FEh Manufacturin
g id R 0006h yes no no no
FFh DiE ID
register R 1000 h yes no no no
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Communication with the TSC1641
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4 Precautions for use
The board is not immune to the disturbance generated from intense radiant sources, according to EN IEC
61000-4-3. During the radiated immunity testing, the board obtained level B, meaning that the board was not
damaged during the test, but showed a performance degradation of over 2% in voltage and current measurement.
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Precautions for use
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5 Schematic diagrams
Figure 8. STEVAL-DIGAFEV1 circuit schematic
1
2
3
4
5
6
A0
A1
A3
A2
A4
A5
ANALOG IN
Arduino Uno - Analog
SIP 6 STEP 2.54MM
CN3
8
7
6
5
4
3
2
17
~6
~5
4
~3
2
TX 1
RX 0
DIGITAL (PWM ~)
Arduino Uno - Digi 1
SIP 8 STEP 2.54MM
CN4
1
2
10
9
8
7
6
5
4
3Aref
GND
13
12
~11
~10
~9
8
DIGITAL (PWM ~)
Arduino Uno - Digi 2
SIP 10 STEP 2.54MM
CN2
1
2
3
4
5
6
7
8
IORef
Reset
3.3V
5V
GND
GND
Vin
POWER
Arduino Uno - Power
SIP 8 STEP 2.54MM
CN1
VCC
GND
GND
C1
1uF
R2
4K7
R1
4K7
I2C_SCL
ALERT/DRDY
A1 1
A0 2
ALERT/DRDY 3
SDA 4
SCL 5
VCC 6
GND
7
VLOAD
8
IN-
9
IN+
10
EP
11
DFN8 EP - 3X3M M
U1
TSC1641
VCC
C2
100nF
VCCVCC
GND
GND
GND
R4
0R
R5
0R
C4
100nF
GNDGND
GND
VLOAD
I2C_SCL
I2C_SDA
D1
R3
560R
VCC
VCC
GND
SB5
INN
TP03
INP
TP02
VLOAD
TP01
SCL
TP05
SDA
TP06
ALERT/DRDY
TP07
SB6
VCC
GND
I2C_SDA
R7 0R
R8 0R
R6
5mR
SM T 0805
C7
10µF
ALERT/DRDY
C3
100pF
C5
100pF
SET A0
JP_A0
SET A0
JP_A1
SET SCL
JP_SCL
SET SCL
JP_SDA
GND
TP04
2 WAYS - STEP 5.08mm
2
1
IN+
TERMINAL BLOCK
J1
HEADER
2 WAYS - STEP 5.08mm
2
1
IN-
TERMINAL BLOCK
J2
HEADER
JM1
PLUG
TERMINAL BLOCK
JM2
PLUG
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Schematic diagrams
UM3202 - Rev 1 page 10/18