ST EVAL-L9958 User manual

November 2014 DocID027205 Rev 1 1/11

AN4627

Application note

Getting started with EVAL-L9958

Introduction

The EVAL-L9958 is the evaluation board designed to provide the user with a platform to

evaluate L9958, the motor driver for DC motors.

The board offers all the inputs and outputs capabilities necessary to configure the device

and to monitor diagnostic functionalities. A lot of test points allow to evaluate and monitor

the signals and the HW status of the device.

The selected solution is the quickest way to discover the L9958 device, to develop the code

to program and control the device and to debug the application.

Figure 1. EVAL-L9958 evaluation board

www.st.com

Contents AN4627

2/11 DocID027205 Rev 1

Contents

1 Getting started with EVAL-L9958 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.1 Board description and connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.2 Device configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Appendix A General handling precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Appendix B Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

DocID027205 Rev 1 3/11

AN4627 List of tables

List of tables

Table 1. Microcontroller connector (J8) – Pin description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 2. Jumpers: description and default configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 3. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

List of figures AN4627

4/11 DocID027205 Rev 1

List of figures

Figure 1. EVAL-L9958 evaluation board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 2. Top side – LEDs and Rest Rext (external reference resistor) . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 3. EVAL-L9958 - Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

DocID027205 Rev 1 5/11

AN4627 Getting started with EVAL-L9958

1 Getting started with EVAL-L9958

1.1 Board description and connections

Figure 2. Top side – LEDs and Rest Rext (external reference resistor)

The EVAL-L9958 evaluation board size is 78 mm x 57 mm, the PCB is FR4 glass epoxy

support with 2 copper layers.

The device L9958 is soldered on the top side; the copper area on top and bottom side of the

PCB is used as heatsink.

A dedicated pin array connector (J8) allows plugging the board in the SPC56 Discovery+

board.

The input signals EN, DI, DIR, PWM as well as the SPI all signals are connected to J8. If the

EVAL-L9958 board is connected to a SPC56 Discovery board, all input signals are properly

connected to the microcontroller.

Table 1 shows the J8 pin connection.

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Getting started with EVAL-L9958 AN4627

6/11 DocID027205 Rev 1

The board comes already configured and the it works properly if plugged in a SPC56x

Discovery+ board. Adding some wires, the board can be driven using SPCDiscovery board

(SPC560B-DIS or SPC560B-DIS) or a different microcontroller evaluation board

Table 2 shows jumper name, the function and the default configuration.

The external PSU must be connected to the VBatt terminal blocks following the polarity

indication on top of the board (check the silkscreen).

VBatt level must be selected in accordance with the motor connected to the outputs as well

as the PSU current capability. The VBAT voltage level must be lower than the maximum

operative voltage of the L9958. The LED D6 is turned on when the board is supplied and

VBAT is ON; the LED D2 highlights the VDD status.

The load (motor) must be connected to J5.

The load connections as well as all the wires must be connected to the board when the

board is not supplied.

Table 1. Microcontroller connector (J8) – Pin description

Pin name Description

A22 PWM input signal

C17 DI input signal

C18 DIR input signal

C26 SI input signal

D17 EN input signal

D18 CS - SPI

D25 SCK - SPI

D18 SO - SPI

C33 VDDIO

A34 GND

Table 2. Jumpers: description and default configuration

Jumper name Description Default config

J2 DIR setting

(from uC, VDDIO, GND or external source)

2-3

(µController)

J3 EN Setting

(from uC, GND or external source)

1-2

(µController)

J4 VDD setting

(from internal regulator or VDDIO)

(+5V)

J6 VDD setting:

(from VDDIO or external source) OFF

DocID027205 Rev 1 7/11

AN4627 Getting started with EVAL-L9958

1.2 Device configuration

L9958 is a configurable device via SPI. The SPI communication allows the user to read

information from the device and diagnostic function.

General handling precautions AN4627

8/11 DocID027205 Rev 1

Appendix A General handling precautions

The following precautions are recommended when using the EVAL-L9958 board:

•Do not modify or manipulate the board when the DC supply is connected to the board.

•Any equipment or tool used for any manipulation of the semiconductor devices or

board modification should be connected to ground to avoid or limit the ESD.

•The connectors and cables must be plugged and removed when the board is not

powered.

•Do not supply the board with a DC source higher than the maximum operative range or

with reverse polarity.

•It is recommended to use antistatic tools.

DocID027205 Rev 1 9/11

AN4627 Schematic diagram

Appendix B Schematic diagram

Figure 3. EVAL-L9958 - Schematic diagram

Revision history AN4627

10/11 DocID027205 Rev 1

Revision history

Table 3. Document revision history

Date Revision Changes

25-Nov-2014 1 Initial release.

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