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.

UM3202

Getting started

UM3202 - Rev 1 page 2/18

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

UM3202 - Rev 1 page 3/18

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

UM3202 - Rev 1 page 4/18

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

UM3202

Standalone

UM3202 - Rev 1 page 5/18

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.

UM3202

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)

name Type Default value Reset after

POR

Reset after

Shutdown

mode

Reset after

Idle mode

Reset after

RST

00h Configuration

01h Shunt voltage

02h Load voltage

resister R 0000h yes no no yes

03h DC power

04h Current

05h Temperature

06h Mask register R/W 0000h yes no no yes

07h Flags register R 0000h yes no no yes

08h Rshunt

09h SOL alert limit

0Ah SUL alert limit

0Bh LOL alert limit

0Ch LUL alert limit

0Dh POL alert limit

0Eh TOL alert limit

FEh Manufacturin

g id R 0006h yes no no no

FFh DiE ID

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Communication with the TSC1641

UM3202 - Rev 1 page 8/18

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.

UM3202

Precautions for use

UM3202 - Rev 1 page 9/18

5 Schematic diagrams

Figure 8. STEVAL-DIGAFEV1 circuit schematic

ANALOG IN

Arduino Uno - Analog

SIP 6 STEP 2.54MM

CN3

TX 1

RX 0

DIGITAL (PWM ~)

Arduino Uno - Digi 1

SIP 8 STEP 2.54MM

CN4

3Aref

GND

~11

~10

DIGITAL (PWM ~)

Arduino Uno - Digi 2

SIP 10 STEP 2.54MM

CN2

IORef

Reset

3.3V

GND

Vin

POWER

Arduino Uno - Power

SIP 8 STEP 2.54MM

CN1

VCC

GND

1uF

4K7

I2C_SCL

ALERT/DRDY

A1 1

A0 2

ALERT/DRDY 3

SDA 4

SCL 5

VCC 6

GND

VLOAD

IN-

IN+

DFN8 EP - 3X3M M

TSC1641

VCC

100nF

VCCVCC

GND

100nF

GNDGND

GND

VLOAD

I2C_SCL

I2C_SDA

560R

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

5mR

SM T 0805

10µF

ALERT/DRDY

100pF

SET A0

JP_A0

SET A0

JP_A1

SET SCL

JP_SCL

SET SCL

JP_SDA

GND

TP04

2 WAYS - STEP 5.08mm

IN+

TERMINAL BLOCK

HEADER

2 WAYS - STEP 5.08mm

IN-

TERMINAL BLOCK

HEADER

JM1

PLUG

TERMINAL BLOCK

JM2

PLUG

UM3202

Schematic diagrams

UM3202 - Rev 1 page 10/18

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