SLVUD80 September   2025

 

  1.   1
  2.   Description
  3.   Features
  4. 1DRV8844AEVM PCB
  5. 2Evaluation Module Overview
    1. 2.1 Introduction
    2. 2.2 Kit Contents
    3. 2.3 Specifications
    4. 2.4 Device Information
  6. 3Evaluation Module Operation
    1. 3.1 Input Control
      1. 3.1.1 Brushed-DC Control
    2. 3.2 LEDs
    3. 3.3 EVM Description
    4. 3.4 Power Connections and Ground Planes
    5. 3.5 Test Points
    6. 3.6 Jumpers
    7. 3.7 Power Outputs
  7. 4Hardware Design Files
    1. 4.1 Schematics
    2. 4.2 PCB Layouts
    3. 4.3 Bill of Materials
  8. 5Trademarks

3 Evaluation Module Operation

The DRV89644 provides four individually controllable 1/2-H-bridge drivers. The devices is used to drive two DC motors, four solenoids, or other loads. The DRV89644EVM allows for users to easily control input signals using four potentiometers designated to control each channel.

When driving loads such as solenoids, the INx input pins directly control the state (high or low) of the OUTx outputs; the ENx input pins enable or disable the OUTx driver.

INx ENx OUTx
X 0 Z
0 1 L
1 1 H
For EVM operation, the inputs can be utilized to control the pulse-width modulation (PWM). The adjustability of the potentiometer-controlled inputs can be used to control the speed of brushed-DC motors. Using the direction and decay switches on the EVM, each channel can be configured to drive ia brushed-DC motor in various directions and decay modes.

IN1 EN1 IN2 EN2 FUNCTION
PWM 1 0 1 Forward PWM, slow decay
0 1 PWM 1 Reverse PWM, slow decay
1 PWM 0 PWM Forward PWM, fast decay
0 PWM 1 PWM Reverse PWM, fast decay
Attention: Note: Using the direction and decay mode switches assumes the load is a brushed-DC motor or solenoid connected in an H-bridge connection (across the corresponding outputs). Input channels 3 & 4 can be used in the same configuration as input channels 1 & 2 above to control brushed-DC motor connected across OUT3-OUT4.