VM Power
DRV8834
M
o
to
r
O
u
tp
u
ts
USB
Conn
USB Chip
MSP430
BDECAY
Config
Switch
3.3V LDO
Test
Points
ADECAY
Config
Switch
BVREF
Config
Switch
AVREF
Config
Switch
Introduction
2
SLVU701B – March 2012 – Revised July 2019
Copyright © 2012–2019, Texas Instruments Incorporated
DRV8834 Evaluation Module
1
Introduction
The DRV8834 customer EVM is a platform revolving around the DRV8834, a low voltage dual H-bridge
driver and highly configurable power stage. This device has been optimized to drive either two brushed
DC motors, a single bipolar stepper with up to 32 degrees of internally generated microstepping, or a
single bipolar stepper with high resolution externally generated microstepping. In this EVM, high resolution
is meant to imply 512 degrees of microstepping, but higher resolution, as given by any given DAC
resource, can be implemented.
The EVM houses an MSP430 microcontroller and an USB interface chip. The USB chip allows for serial
communications from a PC computer where a Windows
®
application is used to schedule serial
commands. These commands can be used to control each of the device’s signals, or control both devices
at the same time to drive a stepper motor.
The microcontroller firmware operates in one of three modes. Each of the three modes can be selected
through the Windows application by choosing the respective operation TAB. The three modes are:
•
Dual H-Bridge with independent current control and PWM control on the ENABLE and PHASE lines.
•
Internal indexer microstepping driver capable of supplying up to 32 degrees of microstepping to a
single bipolar stepper motor.
•
Dual H-Bridge configured to supply up to 512 degrees of microstepping to a single bipolar stepper
motor.
This user's guide details the operation of the EVM in any of the three modes, as well as the hardware
configurability of the evaluation module.
2
Block Diagram
