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DRV8833 dual motor driver

DRV8833 dual motor driver

This tiny dual motor driver from Pololu carries a TI DRV8833 dual H-bridge. Supplyied with a 2.7 - 10.8 V voltage, it can deliver 1.2A (2A peak) to two DC motors. It integrates protections against reverse-voltage, under-voltage, over-current, and over-temperature.
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Overview of the DRV8833 dual motor driver from Pololu

This dual motor driver carries the double H-bridge DRV8833 from Texas Instruments. It allows you to independantly command two little DC motors.

drv8833 dual motor driver from pololu

The characteristics are the following:

  • Working voltage: 2.7‌‌–10.8 V
  • Output current: 1.2A continuous (2A peak) per motor
  • Motor outputs can be paralleled to deliver 2.4A continuous (4A peak) to a single motor
  • 3V compatible inputs
  • Undervoltage, overcurrent, and thermal shutdown
  • Reverse-voltage protection circuit
  • Current limiting can be enabled by adding sense resistors (not included)

The DRV8833 dual motor driver from Pololu is shipped with two 8-pin 0.1" male headers so you can connect it to breadboards or perfboards.

headers and drv8833 dual motor driver from pololudrv8833 dual motor driver from pololu on a breadboard

Using the DRV8833 dual motor driver from pololu

pins of the drv8833 dual motor driver from pololu

Each of the two channels of the DRV8833 dual motor driver has two inputs xIN1 and xIN2, that activate the corresponding outputs xOUT1 and xOUT2. PWM signal can be applyed to these inputs that are pulled low by default, deactivating the dual motor driver.

PINEtat par défautDescription
VIN   2.7‌–10.8V motor power supply connection. Operation with VIN below 5V slightly reduces the maximum current output.
VMM   Motor power supply after the reverse-voltage protection MOSFET. It can be used to supply reverse-protected power to other components in the system, but it should not be used for high currents. This pin should only be used as an output.
GND   Common ground for the motor and logical power supplies.
AOUT1   The motor A output pin controlled by AIN1
AOUT2
  The motor A output pin controlled by AIN2
BOUT1
  The motor B output pin controlled by BIN1
BOUT2
  The motor B output pin controlled by BIN2
AIN1 low The logic input control of AOUT1. PWM can be applied to this pin.
AIN2 low The logic input control of AOUT2. PWM can be applied to this pin.
BIN1 low The logic input control of BOUT1. PWM can be applied to this pin.
BIN2 low The logic input control of BOUT2. PWM can be applied to this pin.
nSLEEP high Sleep input: the dual motor driver enters a low-power sleep mode when this pin is driven low.
nFAULT floating Fault output: driven low in the event of an over-current, over-temperature, or under-voltage condition floating otherwise.
AISEN   Current sense pin for motor A. This pin is connected to ground and does not function by default, modfications are needed to enable current limiting.
BISEN   Current sense pin for motor B. This pin is connected to ground and does not function by default, modfications are needed to enable current limiting.

The nSLEEP inputs allows to put the dual motor driver in a low-consumption sleep mode when pulled in low state. It's driven high by the board so you don't need to connect it if you don't want to use it.

nFAULT is an open-drain output that is driven low by the board when under-voltage, over-current or over-heating occurs. You have to connect it to an external pull-up resistor if you want to monitor errors.

The DRV8833 dual motor driver can actively limit the current through the motors by using a fixed-frequency PWM current regulation (current chopping). By default, the AISEN and BISEN pins are linked to ground, disabling the current limiting feature.To enable it, youhave to cut (with a knife) the break points on the back of the board and then solder some appropriate current sense resistors to the unpopulated pads on the front. Refer to the DRV8833 datasheet to calculate theresistor values.

current chopping with the DRV8833 dual motor driver from pololu

The DRV8833 dual motor driver from Pololu can support current up to 1.5A but overheat very quickly in these conditions. We recommand to stay under 1.3A and to add a heat sink if needed.

Warning, the DRV8833 dual motor driver reaches a temperature hot enough to burn you long before overheating. Handle this device with care.

electrical diagram of the DRV8833 dual motor driver from pololu

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