ST STEVAL-DPSG474 User manual

Introduction

The STEVAL-DPSG474 is a digital power supply control kit. It consists of a main board, based on the

STM32G474RE microcontroller from the STM32G4 family, and an adapter board, which provides different

communication interfaces and allows programming the microcontroller through a standard 20-pin JTAG connector.

The STM32G474RE microcontroller includes the high-performance Arm® Cortex® M4 32-bit RISC core operating

at up to 170 MHz frequency, a floating point unit (FPU), a full set of DSP (digital signal processing) instructions,

and high-speed embedded memories (512 Kbytes of flash memory and 128 Kbytes of SRAM).

The device embeds peripherals that allow the mathematical/arithmetic function acceleration (CORDIC for

trigonometric functions and FMAC unit for filter functions).

The MCU offers five fast 12-bit ADCs (5 Msps), seven ultra-fast comparators, six operational amplifiers, seven

DAC channels (three external and four internal), a low-power RTC, 32-bit timers, three timers dedicated to motor

control, seven general-purpose 16-bit timers, one 16-bit low-power timer, and the high-resolution timer (HRTIM)

with 184 ps resolution, specifically designed to drive power conversion systems.

The main board embeds a standard 64-pin DIN 41612 connector for connection with a power board. It provides

all the PWM control signals, sensing networks, and protection features needed for a wide range of digital power

supply applications.

An external 5 V supply voltage can supply the board either through a dedicated connector or through the main

connector. The adapter board features a configurable user communication (SMBus, CAN, or RS-232) with two

DB9 connectors and the appropriate transceiver ICs, a standard STDC14 14-pin connector, which provides

the SWD interface for debugging and USART communication for user interface (UI), and the standard JTAG

connector for programming.

The board also includes a reset button and a termination resistance between the CAN lines.

You can easily connect the STEVAL-DPSG474 to another control board via opto-coupled serial communication

and dedicated connectors.

Figure 1. STEVAL-DPSG474 control board

Getting started with the STEVAL-DPSG474 digital power supply control kit

UM2997

User manual

UM2997 - Rev 1 - April 2022

For further information contact your local STMicroelectronics sales office. www.st.com

Figure 2. STEVAL-DPSG474 adapter board

UM2997

UM2997 - Rev 1 page 2/24

1Features

• Control board for digital SMPS (PFC converters, HF isolating DC-DC converters, DC-AC inverters) based on

the STM32G474RE microcontroller:

–High-resolution timer (HRTIM) for D-SMPS applications

– Filter math accelerator unit (FMAC) to perform arithmetic operations on vectors

– Coprocessor (CORDIC) to provide hardware acceleration of trigonometric functions

• 64-pin DIN 41612 connector for D-SMPS modular approach

• STDC14 programming connector

• Opto-coupled serial communication for board-to-board communication

• RC filters for analog inputs

• Protection of the microcontroller analog lines with diode arrays

• ESD protection on SWD and COM lines

• Adapter board provided for programming and user communication (USART, CAN, SMBus)

• Supply voltage: 5 V

• Embedded 5 V/3.3 V voltage regulator

• Dedicated test points for debugging

• LED signaling for power-on, faults, errors, and general purpose

• RoHS compliant

UM2997

Features

UM2997 - Rev 1 page 3/24

2Overview

The STEVAL-DPSG474 has been specifically designed to control digital-based power converters (DSMPS) such

as PFC converters, resonant converters, and HF isolating DC-DC converters in general. It interfaces with the

power board using a standard 64-pin DIN 41612 connector, which provides control signals, ADC channels, COMP

I/O, GPIOs, and the communication features needed to implement advanced control techniques for a wide range

of DSMPS applications.

The control board embeds an STM32G474RE microcontroller with a high-resolution timer (HRTIM), which

guarantees a fine control capability, specially for high frequency and resonant converters.

Figure 3. STEVAL-DPSG474 control board: main components

1. U1: STM32G474RE 32-bit microcontroller

2. U2: DSMPS standard 64-pin connector for digital power applications

3. U3: STDC14 connector to program and/or debug applications via ST-LINKV3 or to connect the adapter board

4. U4: Supply connector to provide an external 5 V

5. U5: LDO to regulate a 3.3 V to supply MCU

6. U6-U7: UART iso-connectors to connect another control board

7. U8: Test points to debug the user application

Figure 4. STEVAL-DPSG474 adapter board: main components

1. U1: JTAG connector

2. U2: jumpers to configure the user communication

3. U3: STDC14 connector to program and/or connect the adapter board

4. U4: RS-232 connector

5. U5: CAN connector

6. U6: reset button

UM2997

Overview

UM2997 - Rev 1 page 4/24

2.1 DSMPS connector

The DSMPS connector is a 64-pin ST standard connector adopted in several power conversion evaluation kits

(for example, STEVAL-DPSLLCK1, STEVAL-DPSTPFC1, STEVAL-LLL009V1, etc.), which allows an easy control

board connection and a fast microcontroller change. Thanks to this modular approach, you can use the same

control board for different applications, or change the microcontroller to evaluate the performances of the latest

ST products.

Table 1. DSMPS connector V 1.7 pinout and related MCU AF

DSMPS connector function DIN 41612 pin MCU pin STM32G474RE alternate function

VDD_iso A1 - -

GND_iso B1 - -

UART_TX_iso A2 PB6 USART1_TX

UART_RX_iso B2 PB7 USART1_RX

N.C. A3 - -

N.C. B3 - -

CAN_1_TX/SPI_NSS A4 PA15 SPI1_NSS/SPI3_NSS/FDCAN3_TX

CAN_1_RX/SPI_SCK B4 PB3 SPI1_SCK/FDCAN3_RX

SMBus_SCL/UI_USART_RX/CAN_2_RX A5 PB8-BOOT0 FDCAN1_RX/I2C1_SCL/USART3_RX

SMBus_SMBA/SPI_MOSI/EEV_4 B5 PB5 I2C1_SMBA/SPI1_MOSI/HRTIM_EEV6

SMBus_SDA/UI_USART_TX/CAN_2_TX A6 PB9 FDCAN1_TX/I2C1_SDA/USART3_TX

GND B6 VSS -

+5V A7 - -

+3.3V B7 VDD, VBAT -

FAULT_1 A8 PC10 HRTIM_FLT6

GPIO_1/GP_PWM_1 B8 PC13 GPIO/TIM1_CH1N

PWM_1 A9 PA8 HRTIM_CHA1/TIM1_CH1

PWM_2 B9 PA9 HRTIM_CHA2/TIM1_CH2

PWM_3 A10 PA10 HRTIM_CHB1/TIM1_CH3

PWM_4 B10 PA11 HRTIM_CHB2/TIM1_CH4/TIM1_CH1N

PWM_5 A11 PB12 HRTIM_CHC1

PWM_6 B11 PB13 HRTIM_CHC2/TIM1_CH1N

PWM_7 A12 PB14 HRTIM_CHD1/TIM15_CH1/TIM1_CH2N

PWM_8 B12 PB15 HRTIM_CHD2/TIM15_CH2/TIM15_CH1N/

TIM1_CH3N

PWM_9 A13 PC8 HRTIM_CHE1/TIM3_CH3/TIM8_CH3

PWM_10 B13 PC9 HRTIM_CHE2/TIM3_CH4/TIM8_CH4

PWM_11 A14 PC6 HRTIM_CHF1/TIM8_CH1/TIM3_CH1

PWM_12 B14 PC7 HRTIM_CHF2/TIM8_CH2/TIM3_CH2

GPIO_2/COMP_2_OUT/GP_PWM_2 A15 PB1 COMP4_OUT/TIM3_CH4

GPIO_3/COMP_1_OUT/FAULT_2 B15 PA12 HRTIM_FLT1/COMP2_OUT

GPIO_4/EEV_1 A16 PC12 HRTIM_EEV1

GND B16 VSS -

GPIO_5/DAC_1 A17 PA4 DAC1_OUT1

GPIO_6/DAC_2 B17 PA5 DAC1_OUT2

UM2997

DSMPS connector

UM2997 - Rev 1 page 5/24

DSMPS connector function DIN 41612 pin MCU pin STM32G474RE alternate function

GPIO_7/DAC_3/OP-AMP_1_OUT A18 PA6 DAC2_OUT1/OPAMP2_VOUT

GPIO_8/EEV_2 B18 PC11 HRTIM_EEV2

GPIO_9/EEV_3/SPI_MISO A19 PB4 HRTIM_EEV7/SPI1_MISO

GPIO_10 B19 PC14 -

ADC_1/DIFF_ADC_1+ A20 PA0 ADC12_IN1/COMP1_INM/COMP3_INP

A_VDD B20 VDDA -

ADC_2/DIFF_ADC_1-/OP-AMP_2+ A21 PA1 ADC12_IN2/OPAMP1-3_VINP

A_GND B21-B32 VSSA -

ADC_3/DIFF_ADC_2+/OP-AMP_2_OUT/

COMP_1_INM A22 PA2 ADC1_IN3/COMP2_INM/OPAMP1_VOUT

ADC_4/DIFF_ADC_2-/OP-AMP_2- A23 PA3 ADC1_IN4/OPAMP1_VINM

ADC_5 A24 PC4 ADC2_IN5

ADC_6/OP-AMP_1- A25 PC5 ADC2_IN11/OPAMP2_VINM/OPAMP1_VINM

COMP_2_INP/ADC_12/OP-AMP_1+ A26 PB0 COMP4_INP/ADC3_IN12/ADC1_IN15/

OPAMP2-3_VINP

ADC_7/COMP_2_INM A27 PB2 ADC2_IN12/COMP4_INM/COMP3_INP

ADC_8/COMP_4_INM A28 PC0 ADC12_IN6/COMP3_INM

ADC_9/COMP_4_INP A29 PC1 ADC12_IN7/COMP3_INP

ADC_10/COMP_4_OUT A30 PC2 ADC12_IN8/COMP3_OUT

COMP_1_INP/ADC_11 A31 PA7 COMP2_INP/ADC2_IN4

COMP_3_INP A32 PB11 COMP6_INP

2.2 STDC14 connector

The CN1 connector can be used either to connect a standard ST-LINKV3 dongle, which allows programming

the microcontroller and debugging the user application using an SWD connection. It also allows connecting the

adapter board included in the STEVAL-DPSG474 kit.

Table 2. CN1 connector pinout

STD14 pin number Function

1 N.C.

2 N.C.

3 3.3V

4 SWDIO

5 GND

6 SWCLK

7 GND

8 N.C.

9 N.C.

10 I2C1_SMBA

11 GND

12 NRST

13 FDCAN1_RX/I2C1_SCL/USART3_RX

14 FDCAN1_TX/I2C1_SDA/USART3_TX

UM2997

STDC14 connector

UM2997 - Rev 1 page 6/24

2.3 Adapter board

The adapter board allows extending the communication interfaces or using a standard 20-pin JTAG dongle to

program the MCU or debug the user application.

You can configure the MCU communication interface (USART3) in UART, CAN, or SMBUS according to the

jumper configuration (J9 and J11). An on-board RS-232 and a CAN transceiver provides the corresponding

outputs on P1 (DB9 female) and P2 (DB9 male) connectors, respectively.

The SMBUS connection is available on the J2 connector. A reset button is also present on the board.

Table 3. Adapter jumper configurations

Function Configuration

UART

CAN

SMBUS

2.4 Isolated serial communication

The control board also features an isolated bidirectional UART communication, which is connected to the MCU

USART1 peripheral.

Tx and Rx signals passes through a digital optocoupler (U8), before being available on the DSMPS connector and

the J3 connector.

The digital optocoupler needs to be supplied on the secondary side by using the VDD_iso and GND_iso pins

on the main 64-pin connector. You can also directly connect two control boards, referred to two isolated supply

voltages, by connecting the J3 connector of the first board to the J4 connector of the second board (or vice versa)

using the provided flat cable. Thus, the VDD supply voltage of the second board becomes the isolated supply

voltage (VDD_iso) to supply the digital optocoupler of the first one.

2.5 LEDs

The control board embeds three user LEDs that, in ST FW applications, are usually adopted to show the status of

the power converter and if any fault occurred. The number of blinks of each LED depends on the final application.

Table 4. Control board LEDs

Diode Name Color Function

D2 STATUS_LED Blue Status LED: it indicates whether the converter is working normally (LED on), or it is in startup

state.

UM2997

Adapter board

UM2997 - Rev 1 page 7/24

Diode Name Color Function

D3 FAULT_LED Red Fault LED: it indicates that a nonrecoverable fault occurred (for example, an overcurrent, etc.)

and you have to restart the board.

D4 ERROR_LED Yellow Error LED: it indicates that a recoverable fault occurred (for example, an input undervoltage,

etc.). The board restarts normal operation when the error is cleared.

UM2997

LEDs

UM2997 - Rev 1 page 8/24

3Getting started

3.1 System requirements

• Windows® OS (7, 8, or 10), Linux® 64-bit, or macOS®

•Debugger and programmer for STM32 (ST-LINKV3, ST-LINK/V2) with the related cable

Note: macOS® is a trademark of Apple Inc. registered in the U.S. and other countries.

Linux® is a registered trademark of Linus Torvalds.

All other trademarks are the property of their respective owners.

3.2 Development toolchains

• IAR Systems - IAR Embedded Workbench®

•Keil® - MDK-ARM

Note: IAR Embedded Workbench® and MDK-ARM are available on Windows® only.

• STMicroelectronics - STM32CubeIDE

3.3 How to use the kit

3.3.1 Standalone mode

To use the STEVAL-DPSG474 standalone, execute the following procedure.

Step 1. Choose one of the substeps below.

Step 1a. Connect the ST-LINKV3 programmer to the STD14 (CN1) connector and connect the USB

cable to the PC.

Step 1b. Connect the adapter board to the STD14 (CN1) connector to use a programmer with a

standard 20-pin JTAG connector, or to use one of the provided communication interfaces

(UART, CAN, or SMBUS).

Step 2. Provide an external 5 V supply voltage to the J1 connector.

The green LED (D1) turns on.

3.3.2 Using another power board

To use the STEVAL-DPSG474 with another evaluation power board, follow the related user manual.

Important: Adopt an isolated programmer or a digital isolator to debug the power application running.

UM2997

Getting started

UM2997 - Rev 1 page 9/24

4Schematic diagrams

Figure 5. STEVAL-DPSG474 control board: MCU circuit schematic

PWM SIGNALS

COMMUNICATION

GPIO AND ALTERNATE FUNCTIONS

LEDs

VOLTAGE REGULATOR

ANALOG INPUTS

GND CON

Stripline male 2x1 2.54mm

To place capacitors as close as possible to each Vdd Pin

MCU I/O

SUPPLY VOLTAGES

SWD & USER COMMUNICATION CONNECTORS

DSMPS CONNECTOR PINS

MCU VDD

ESD PROTECTIONS

CAN_1_TX/SPI_NSS

SMBus_SCL/UI_USART_RX/CAN_2_RX

+5V

+3.3V

FAULT_1

SMBus_SDA/UI_USART_TX/CAN_2_TX

PWM_1

PWM_2

PWM_3

PWM_4

PWM_5

PWM_6

PWM_7

PWM_8

PWM_9

GPIO_2/COMP_2_OUT/GP_PWM_2

GPIO_4/EEV_1

GPIO_5/DAC_1

GPIO_6/DAC_2

GPIO_7/DAC_3/OP-AMP_1_OUT

GPIO_8/EEV_2

GPIO_10

GPIO_9/EEV_3/SPI_MISO

A_VDD

ADC_1/DIFF_ADC_1+

ADC_2/DIFF_ADC_1-/OP-AMP_2+

ADC_5

ADC_3/DIFF_ADC_2+/OP-AMP_2_OUT/COMP_1_NM

ADC_4/DIFF_ADC_2-/OP-AMP_2-

ADC_6/OP-AMP_1-

COMP_2_INP/ADC_12/OP-AMP_1+

ADC_7/COMP_2_INM

ADC_8/COMP_4_INM

ADC_9/COMP_4_INP

ADC_10/COMP_4_OUT

PWM_10

COMP_1_INP/ADC_11

PWM_11

PWM_12

CAN_1_RX/SPI_SCK

SMBus_SMBA/SPI_MOSI/EEV_4

MCU_USART_ISO_TX

MCU_USART_ISO_RX

GPIO_1/GP_PWM_1

GND

COMP_3_INP

GPIO_3/COMP_1_OUT/FAULT_2

GND

+5V

GNDGND

VDDA

+3.3V

GND GND

GND A_GND

A_GND

+3.3V

+5V

+3.3V

VDDA

A_GND

VDDA

A_GND

VDDA

A_GND

VDDA

A_GND

VDDA

A_GND

GND

A_GND

GND

VDDA

GND

+3.3V

GND

A_GND

+3.3V

GND

GND GND

GND

DA108S1RL

REF4

REF1 2

I/O 1

I/O 2

I/O 3

I/O 4

REF3

REF2

TP2

1 2

470 OHM

TP46

R11

270

TP29

24MHz

TP34

TP25

TP28

R18

10R

TP42

C16

1uF

C12

10pF

C37

0.1uF

R24

10R

U6 2

LD1117S33CTR

Vout_2

GND

3Vin 4

Vout_4

10pF

C27

10pF

TP5

C24

0.1uF

2 of 2

U2A

VSS1

STM32G474RET6

VSSA

VREF+

VBAT 29

VDDA

VSS2

16 VDD1

32 VDD2

48 VDD3 47

VSS3 63

VSS4

64 VDD4

DA108S1RL

REF4

8REF1 1

I/O 1

I/O 2

I/O 3

I/O 4

REF3

REF2

TP12

R28

10R

R13

10R

A C

LED BLUE

TP40

TP21

TP15

R17

10R

TP17

TP45

R14

270

C35

470nF

TP43

TP33

TP19

R22

SMAJ5.0A-TR

10R

TP1

C30

10uF

C34

10nF

TP11

C15

0.1uF

TP32

TP24

TP27

TP39

10pF

TP4

6.8pF

C20

0.1uF

R12

10R TP6

C28

10pF

DA108S1RL

REF4

REF1 2

I/O 1

I/O 2

I/O 3

I/O 4

REF3

7REF2

R16

10k

Con2

1 2

C10

6.8pF

TP37

C31

100uF16V

C13

10pF

TP10

TP14

R25

10R

TP8

A C

LED GREEN

TP38

TP26

A C

LED YELLOW

C18

0.1uF

TP41

TP18

C19

470nF

C32

0.1uF

C23

0.1uF

TP36

R10

10R

CN1

1 2

3 4

5 6

ST-LInk V3 & Adapter CON

7 8

9 10

11 12

13 14

270

TP31

TP23

C25

10pF

R21

TP20

R32

47k

R20

10R

TP3

TP9

10pF

TP30

R23

10R

Ext Supply

RED LED

10R

10pF

C29

10pF

C14

10pF

TP44

Jumper-Female

TP13

R26

47k

R15

270

R29

C22

0.1uF

C26

10pF

TP7

C11

10pF

C21

0.1uF

C36

Con2_Strp_male_SMD

0.1uF

R30

R19

10R

1 of 2

U2B

12 PA0

STM32G474RET6

13 PA1

14 PA2

17 PA3

18 PA4

19 PA5

0PA6

21 PA7

42 PA8

DAC2_OUT1/OPAMP2_VOUT

43 PA9

44 PA10

45 PA11

46 PA12

49 PA13

50 PA14

51 PA15

24 PB0

25 PB1

26 PB2

56 PB3

57 PB4

58 PB5

59 PB6

60 PB7

62 PB8-BOOT0

PB9

30 PB10

33 PB11

34 PB12

35 PB13

36 PB14

37 PB15

PC0 9

PC1 10

PC2 11

PC3 22

PC4 23

PC5 38

PC6 39

PC7 40

PC8 41

PC9 52

PC10 53

PC11 54

PC12

PC13

PC14-OSC32_IN

PD2

PC15-OSC32_OUT

PF0-OSC_IN

PF1-OSC_OUT

PG10-NRST

C17

0.1uF

TP35

C33

10uF

TP22

IC1

1I_O1

ESDALC6V1W5

2GND

3I_O2 4

I_O3

I_O4

TP16

SPI1_NSS/FDCAN3_TX

FDCAN1_RX/I2C1_SCL/USART3_RX

HRTIM_FLT6

FDCAN1_TX/I2C1_SDA/USART3_TX

HRTIM_CHA1/TIM1_CH1

HRTIM_CHA2/TIM1_CH2

HRTIM_CHB1/TIM1_CH3

HRTIM_CHC1

HRTIM_CHB2/TIM1_CH4

HRTIM_CHC2/TIM1_CH1N

HRTIM_CHD1/TIM1_CH2N

HRTIM_CHD2/TIM1_CH3N

HRTIM_CHE1/TIM8_CH3

COMP4_OUT/TIM3_CH4

HRTIM_EEV1

DAC1_OUT1

DAC1_OUT2

HRTIM_EEV2

DAC2_OUT1/OPAMP2_VOUT

PC14

HRTIM_EEV7/SPI1_MISO

HRTIM_CHE2/TIM8_CH4

HRTIM_CHF1/TIM8_CH1

HRTIM_CHF2/TIM8_CH2

SPI1_SCK/FDCAN3_RX

TIM1_CH1N

I2C1_SMBA/SPI1_MOSI/HRTIM_EEV6

USART1_RX

COMP2_OUT/HRTIM_FLT1

USART1_TX

STATUS_LED

FAULT_LED

ERROR_LED

ADC12_IN1

ADC12_IN2/OPAMP1_VINP

ADC1_IN3/OPAMP1_VOUT/COMP2_INM

ADC1_IN4/OPAMP1_VINM

ADC2_IN5

ADC2_IN11/OPAMP2_VINM

ADC12_IN6/COMP3_INM

ADC12_IN7/COMP3_INP

COMP6_INP

ADC12_IN1

ADC12_IN2/OPAMP1_VINP

ADC1_IN3/OPAMP1_VOUT/COMP2_INM

DAC1_OUT1

ADC1_IN4/OPAMP1_VINM

DAC1_OUT2

COMP2_INP/ADC2_IN4

HRTIM_CHA1/TIM1_CH1

HRTIM_CHA2/TIM1_CH2

HRTIM_CHB1/TIM1_CH3

HRTIM_CHC1

HRTIM_CHB2/TIM1_CH4

HRTIM_CHC2/TIM1_CH1N

HRTIM_CHD1/TIM1_CH2N

HRTIM_CHD2/TIM1_CH3N

HRTIM_CHE1/TIM8_CH3

HRTIM_CHE2/TIM8_CH4

HRTIM_CHF1/TIM8_CH1

HRTIM_CHF2/TIM8_CH2

HRTIM_FLT6

SPI1_NSS/FDCAN3_TX

SPI1_SCK/FDCAN3_RX

FDCAN1_RX/I2C1_SCL/USART3_RX

FDCAN1_TX/I2C1_SDA/USART3_TX

USART1_TX

USART1_RX

I2C1_SMBA/SPI1_MOSI/HRTIM_EEV6

TIM1_CH1N

COMP4_OUT/TIM3_CH4

HRTIM_EEV1COMP2_OUT/HRTIM_FLT1

HRTIM_EEV2

PC14

ADC2_IN5

HRTIM_EEV7/SPI1_MISO

ADC2_IN11/OPAMP2_VINM

COMP4_INP/ADC3_IN12/OPAMP2_VINP

ADC2_IN12/COMP4_INM

ADC12_IN6/COMP3_INM

ADC12_IN7/COMP3_INP

COMP6_INP

ADC12_IN8/COMP3_OUT

STATUS_LED

FAULT_LED

ERROR_LED

DEBUG_PIN

NRST

SWCLK

SWDIO

NRST

FDCAN1_RX/I2C1_SCL/USART3_RX

SWDIO

SWCLK

FDCAN1_TX/I2C1_SDA/USART3_TX

SWDIO

SWCLK

FDCAN1_RX/I2C1_SCL/USART3_RX

NRST

FDCAN1_TX/I2C1_SDA/USART3_TX

I2C1_SMBA/SPI1_MOSI/HRTIM_EEV6

COMP4_INP/ADC3_IN12/OPAMP2_VINP

ADC2_IN12/COMP4_INM

ADC12_IN8/COMP3_OUT

COMP2_INP/ADC2_IN4

UM2997 - Rev 1 page 10/24

UM2997

Schematic diagrams

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