ST EVSPIN948 Manuale utente

Introduction

The EVSPIN948 dual brushed DC motor driver expansion board is based on the STSPIN948.

It provides an affordable and easy-to-use solution for the implementation of brushed DC motor driving applications. Thanks to

the parallel operation, it can be easily converted to a single brushed DC motor driver with double current capability. In addition to

the internal current limiters, the integrated amplifiers allow it to be used in systems with external current control. The

EVSPIN948 is compatible with the Arduino UNO R3 connector and most STM32 Nucleo boards.

Figure 1. EVSPIN948 expansion board

Getting started with the EVSPIN948 dual brushed DC motor driver expansion

board based on the STSPIN948

UM3206

User manual

UM3206 - Rev 1 - July 2023

For further information contact your local STMicroelectronics sales office.

www.st.com

1 Safety precautions

Warning: Some of the components mounted on the board could reach hazardous temperatures

during operation.

While using the board, please follow the following precautions:

• Do not touch the components or the heatsink.

• Do not cover the board.

• Do not put the board in contact with flammable materials or with materials releasing smoke when heated.

• After operation, allow the board to cool down before touching it.

UM3206

Safety precautions

UM3206 - Rev 1 page 2/18

2 Getting started

The main features of the EVSPIN948 expansion board are:

• Voltage range from 5 V to 58 V

• Phase current up to 5 A r.m.s for each motor

• Adjustable output slew rate

• Five different driving modes

• Two independent current limiters with adjustable OFF time

• Two integrated amplifiers with fixed gain

• Full protection set including: overcurrent, undervoltage lock out and thermal shutdown

• Compatibility with Arduino UNO R3 connector and STM32 Nucleo boards

The EVSPIN948 evaluation board is ready to be used in few steps. Follow this procedure to start your evaluation:

1. Check the setting of the jumpers based on your configuration as described in Section 3 Hardware

description and configuration

2. Connect the board with the STM32 Nucleo board through the Arduino UNO R3

3. Supply the board through the input 2 (VS) and 1 (ground) of the connector CN1

Further support material is available on the STSPIN948 product page www.st.com

UM3206

Getting started

UM3206 - Rev 1 page 3/18

3 Hardware description and configuration

Figure 2. EVSPIN948 overview

The following tables provide the detailed pinout of the Arduino UNO R3 and ST Morpho connectors.

Table 1. Arduino UNO R3 connector table

Connector Pin(1) Signal Remarks

CN5

2 Offset enable (operational amplifier A)

3 Standby (active low)

4 Offset enable (operational amplifier B)

5 Enable bridge B

6 Operational amplifier A output

7 Ground

CN9

3 Voltage reference current limiter A

5 PWM1A input

6 PHA input

7 Enable bridge A

CN6

2 VDD

6 Ground

7 Ground

CN8

1 PHB input

2 PWM1B input

3 TOFFA signal Digital output in

PWM trimming mode

UM3206

Hardware description and configuration

UM3206 - Rev 1 page 4/18

Connector Pin(1) Signal Remarks

CN8

4 Voltage reference current limiter B

5 TOFFB signal Digital output in

PWM trimming mode

6 Operational amplifier B output

1. All non-listed pins are not connected.

3.1 Driving mode selection

The EVSPIN948 can drive up to 2 DC motors at the same time.

The driving mode selection is done setting J5 and J6 jumpers (connected to MODE1 and MODE2 pins of the

device) on the top of the boards.

The table below briefly summarizes the possible configurations:

J5 J6 Driving mode Typical application

Max output

current (each

motor)

Output

RDS(ON)

Minimum

OCD

threshold

1-2 1-2 Reserved

1-2 2-3 Dual full bridge 2 x bidirectional brushed DC

(Figure 3)5 Arms 0.4 Ω 7 A

2-3 1-2 Dual half bridge

2 x high current unidirectional

brushed DC(1) (Figure 4)10 Arms

0.2 Ω

14 A

1 x high current bidirectional

brushed DC (Figure 5)0.4 Ω

2-3(2) 2-3(2) Dual full bridge with

mixed decay

2 x bidirectional brushed DC

Bipolar stepper

(Figure 3)

5 Arms 0.4 Ω 7 A

1. The motors can be connected between OUT and either VS (like in the figure) or GND. In the latter case, the current limiter

must be disabled. Motors can also be connected between OUT and LSS (without the need of disabling the current limiter),

soldering one of the motor cables directly to R12 or R13.

2. This configuration is only available with current limiter in Fixed OFF time mode (see Section 3.2)

UM3206

Driving mode selection

UM3206 - Rev 1 page 5/18

Figure 3. Two bidirectional DC motors

B-

B+

A+

A-

VVS

GND

UM3206

Driving mode selection

UM3206 - Rev 1 page 6/18

Figure 4. Two unidirectional DC motors – higher current

B+

B-

A-

A+

VVS

GND

UM3206

Driving mode selection

UM3206 - Rev 1 page 7/18

Figure 5. One bidirectional DC motor - higher current

B+

B-

A-

A+

VVS

GND

3.2 Current limiter mode

The behavior of the current limiter can be changed by setting the J7 jumper (connected to MODE3 of the device)

as follows:

Table 2. Current limiter mode settings

J7 Current limiter mode J2 and J3 Decay time

1-2 Fixed OFF time Closed Depending on R6 and R7 resistors

(Figure 6)

2-3 PWM trimming Open Depending on PWM input signals

In Fixed OFF time mode, the current limiter A and current limiter B can be disabled by setting R6 and R7

to their minimum value respectively.

The current threshold can be set in two different ways:

• Trimming R41 and R46 resistors, leaving CN9.3 and CN8.4 floating

• Applying a square wave with variable duty cycle to CN9.3 and CN8.4, setting R41 and R46 to their

minimum value

UM3206

Current limiter mode

UM3206 - Rev 1 page 8/18

Figure 6. tOFF versus ROFF

3.3 Output slew rate

The output slew rate can be increased moving the rotative switch SW1 clockwise. With the STSPIN948 device,

the slew rate value can be chosen from four different values, as shown in Table 3.

Table 3. Slew rate settings

SW1 RSR Slew rate (typ. at VS = 58 V)

C-1 closed 10 kΩ 0.3 V/ns

C-2 closed 5.6 kΩ 0.6 V/ns

C-3 closed 2.2 kΩ 1.2 V/ns

C-4 closed 1 kΩ 2 V/ns

UM3206

Output slew rate

UM3206 - Rev 1 page 9/18

4 Thermal performance

An example of the thermal performances of the EVSPIN948 is provided in Figure 7 . The board is used in full-

bridge and parallel half-bridge configuration in a typical application to drive an inductive load with different output

currents ranging from 0.5 A to 3 A.

Set-up conditions:

•Planar orientation of the board and natural convection only

•Tambient = 25 °C

•PWM frequency = 20 KHz

•VS = 30 V

•Output slew rate setting = 2 V/ns

Figure 7. EVSPIN948 - thermal performances

100

120

140

0 1 2 3

Maximum

temperature [°C]

Output current

[ARMS]

Parallel half bridge

Full bridge

Figure 8. Thermal images (IOUT = 2ARMS)

Full-bridge configuration Parallel half-bridge configuration

UM3206

Thermal performance

UM3206 - Rev 1 page 10/18

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