SLOU571 June   2024

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 EVM Setup and Mode Select
      1. 2.1.1 Jumpers
      2. 2.1.2 DRV8421A: Brushed-DC Setup
      3. 2.1.3 DRV8421A: Stepper Setup
      4. 2.1.4 DRV8421B: Brushed-DC Setup
      5. 2.1.5 DRV8421B: Stepper Setup
      6. 2.1.6 EVM Control
        1. 2.1.6.1 DRV8421A: Brushed-DC Motor Control
        2. 2.1.6.2 DRV8421A: Stepper Motor Control
        3. 2.1.6.3 DRV8421B: Brushed-DC Motor Control
        4. 2.1.6.4 DRV8421B: Stepper Motor Control
      7. 2.1.7 Parallel Mode
        1. 2.1.7.1 DRV8421A: Parallel Mode
        2. 2.1.7.2 DRV8421B: Parallel Mode
      8. 2.1.8 Removing and Installing Supported Motor Drivers
  9. 3Hardware Design Files
    1. 3.1 Schematics
    2. 3.2 PCB (Top-Assembly View)
    3. 3.3 Bill of Materials (BOM)
  10. 4Additional Information
    1. 4.1 Trademarks

2.1.6.3 DRV8421B: Brushed-DC Motor Control

The MSP430 produces PWM signals for the IN1 and IN2 pins with duty cycles proportional to the voltage from the MCU Ctrl 1 and MCU Ctrl 2 potentiometers. To achieve a 1 or 0 for the outputs, the input potentiometers must be turned completely clockwise or counterclockwise. The table below shows how to configure the input potentiometers for different modes of operation.

Table 2-3 DRV8421B Control

EN

IN1

IN2

OUT1

OUT2

OUT3

OUT4

Description

0

X

X

OFF

OFF

OFF

OFF

Low-power sleep mode

1

Low – turn MCU CTRL 1 completely counter-clockwise

X

1

0

X

X

Channel 1

Forward

1

High – turn MCU CTRL 1 completely clockwise

X

0

1

X

X

Channel 1

Reverse

1

X

Low – turn MCU CTRL 2 completely counter-clockwise

X

X

1

0

Channel 2

Forward

1

X

High – turn MCU CTRL 1 completely clockwise

X

X

0

1

Channel 2

Reverse
DRV8421AEVM, DRV8421BEVM EVM Controls for Brushed-DC Motor Operation with DRV8421B Figure 2-11 EVM Controls for Brushed-DC Motor Operation with DRV8421B