DRV8704EVM: 50 ~ 400mA, 8 ~ 52V, Dual H-Bridge Brushed DC Motor Driver

The DRV8704 customer EVM is a platform built around the DRV8704, a dual H-bridge brushed DC motor driver with highly-configurable power stage. This device is optimized to drive two different brushed DC motors with variable current limiting and an internal 5-V LDO for powering peripheral devices.

The EVM includes two 555-timer circuits configured to switch at approximately 25 kHz with independentlyvariable duty-cycles. Each 555 timer is tied to a jumper pin allowing the user to select which channel ofthe DRV8704 is receiving the PWM signal. This analog generation of PWM signals allows for standalone use of the EVM without any firmware being flashed onto a microcontroller.

If the user would like to control the EVM using an MCU, the two 10×1, 100-mil headers can be docked to TI's MSP430™ LaunchPad™ and controlled using whatever firmware is supplied by the user. SPIcommands can be written or read by simply docking the EVM to a LaunchPad or tying into the 4 SPI pinswith another MCU.

Features:

• Pulse Width Modulation (PWM) Motor Driver

  - Drives External N-Channel MOSFETs

  - PWM Control Interface for Dual DC Motors

  - Supports 100% PWM Duty Cycle

• 8-V to 52-V Operating Supply Voltage Range

• Adjustable Gate Drive (4 Levels)

• 50-mA to 200-mA Source Current

• 100-mA to 400-mA Sink Current

• Integrated PWM Current Regulation

• Flexible Decay Modes

  - Automatic Mixed Decay Mode

  - Slow Decay

  - Fast Decay

  - Mixed Decay (Adjustable Percent Fast)

• Highly Configurable SPI

• Torque DAC to Digitally Scale Current

• Low-Current Sleep Mode (65 μA)

• 5-V, 10-mA LDO Regulator

• VM Undervoltage Lockout (UVLO)

• Gate Driver Fault (PDF)

• Overcurrent Protection (OCP)

• Thermal Shutdown (TSD)

• Fault Condition Indication Pin (nFAULT)

• Fault Diagnostics through SPI