SLOU535 June   2019

 

  1.   DRV8428x Evaluation Module User's Guide
    1.     Trademarks
    2. 1 Board Overview
    3. 2 Introduction
      1. 2.1 Connectors
      2. 2.2 Test Points
      3. 2.3 Jumpers
      4. 2.4 Motor Outputs
      5. 2.5 EVM Operation
      6. 2.6 EVM documentation

2.2 Test Points

A header connector with 0.100-inch pitch (J3) provides access to the DRV8428x signals. This can be used for measurement or as a connector to control the DRV8428x from an external microcontroller for prototype purposes. To disconnect the on-board MSP430 microcontroller, remove related zero ohm resistors between the MSP430 and the J3 header. Table 1 describes the connections available on the J3 header. Each header pin is labeled on the evaluation module and connects to a similarly named pin of the DRV8428x.

Table 1. Connections to DRV8428x Using External Microcontroller

Header Label Description
MCU 3.3 V 3.3 V rail for the on-board MSP430 and nFAULT LED
nFAULT EN/nFault pin.
VREF/VREFB Current set reference input (DRV8428x) or Bridge B.current set reference input (DRV8428xE/P).
MO/VREFA Microstepping mode-setting pin (DRV8428x) or Bridge A.current set reference input (DRV8428xE/P).
TOFF/DECAY Sets the Decay mode and off time during current chopping.
DECAY0/BDECAY No connection
DECAY1/ADECAY No connection
M1/BPH/BIN2 Microstepping mode-setting pin (DRV8428x); or Bridge B phase input (DRV8428xE) or PWM input (DRV8428xP).
STEP/BEN/BIN1 STEP pin (DRV8428x); or Bridge B enable input (DRV8428xE) or PWM input (DRV8428xP).
DIR/APH/AIN2 DIR pin (DRV8428x); or Bridge A phase input (DRV8428xE) or PWM input (DRV8428xP).
ENABLE/AEN/AIN1 En/nFault pin (DRV8428x); or Bridge A enable input (DRV8428xE) or Bridge A PWM input (DRV8428xP).
nSLEEP Sleep mode input.
GND Ground