This tiny breakout board for TI’s DRV8838 motor driver can deliver a continuous 1.7 A (1.8 A peak) to a single brushed DC motor. With an operating voltage range from 0 V to 11 V and built-in protection against reverse-voltage, under-voltage, over-current, and over-temperature, this driver is a great solution for powering a small, low-voltage motor. The carrier board has the form factor of a 10-pin DIP package, which makes it easy to use with standard solderless breadboards and 0.1″ perfboards.
Texas Instruments’ DRV8838 is a tiny H-bridge motor driver IC that can be used for bidirectional control of one brushed DC motor at 0 V to 11 V. It can supply up to about 1.7 A continuously and can tolerate peak currents up to 1.8 A for a few seconds, making it an ideal driver for small motors that run on relatively low voltages. The DRV8838 is a great IC, but its small, leadless package makes it difficult for the typical student or hobbyist to use; our breakout board gives this driver the form factor of a 10-pin DIP package, which makes it easy to use with standard solderless breadboards and 0.1″perfboards. Since this board is a carrier for the DRV8838, we recommend careful reading of the DRV8838 datasheet (1MB pdf). The board ships populated with SMD components, including the DRV8838, and adds a FET for reverse battery protection.
- H-bridge motor driver: can drive one DC motor
- Motor supply voltage: 0 V to 11 V
- Logic supply voltage: 1.8 V to 7 V
- Output current: up to 1.7 A continuous (1.8 A peak); operation at low motor and logic supply voltages reduces the maximum continuous output current
- PHASE/ENABLE interface (one pin controls direction and another controls speed)
- Inputs are 3V- and 5V-compatible
- Under-voltage lockout on the logic supply and protection against over-current and over-temperature
- Reverse-voltage protection on the motor supply
- Compact size (0.5″×0.4″) with the form factor of a 10-pin DIP package
Two 1×5-pin breakaway 0.1″ male headers are included with the DRV8838 dual motor driver carrier, which can be soldered in to use the driver with breadboards, perfboards, or 0.1″ female connectors. (The headers might ship as a single 1×10 piece that can be broken in half.) The right picture above shows the two possible board orientations when used with these header pins (parts visible or silkscreen visible). You can also solder your motor leads and other connections directly to the board.
Using the motor driver
Motor and motor power connections are made on one side of the board and logic power and control connections are made on the other. The driver requires a motor voltage between 0 V and 11 V to be supplied to the VIN or VM pin and a logic voltage between 1.8 V and 7 V to be supplied to the VCC pin; the logic voltage can typically be supplied by or shared with the controlling device. The VIN pin is the reverse-protected motor supply input and is the recommended point for connecting motor power. However, driver performance will start getting worse when the input voltage to the reverse-protection circuit is below a few volts, and 1.5 V is the lower limit of where the VIN pin can be used. For very low voltage applications, the motor supply should be connected directly to VM, which bypasses the reverse-protection circuit.
The DRV8838 offers a simple two-pin PHASE/ENABLE control interface, where the PHASE pin determines the motor direction and the ENABLE pin can be supplied with a PWM signal to control the motor speed. The PHASE and ENABLE control inputs are pulled low through weak internal pull-down resistors (approximately 100 kΩ). When the ENABLE pin is low, the motor outputs are both shorted to ground, which results in dynamic braking of a connected motor.
The SLEEP pin can be driven low to put the driver into a low-power sleep mode and turn off motor outputs, which is useful if you want to let the motor coast. The SLEEP pin is pulled high through a 10 kΩ pull-up resistor on the carrier board so that the driver is awake by default; the quiescent current draw of the board will be dominated by the current through this resistor when the pin is driven low to put the driver to sleep. In most applications, this pin can be left disconnected or can serve primarily as a way to enable coasting. For applications where a low-power sleep mode is desirable, the 10 kΩ pull-up resistor can be removed or the logic voltage (VCC) for the driver can be dynamically supplied by a digital output of your microcontroller.
The following simplified truth table shows how the driver operates:
|0||PWM||1||PWM||L||forward/brake at speed PWM %|
|1||PWM||1||L||PWM||reverse/brake at speed PWM %|
|X||0||1||L||L||brake low (outputs shorted to ground)|
|X||X||0||Z||Z||coast (outputs floating/disconnected)
|Size:||0.4″ × 0.5″1|
|Minimum operating voltage:||0 V|
|Maximum operating voltage:||11 V|
|Continuous output current per channel:||1.7 A2|
|Peak output current per channel:||1.8 A|
|Maximum PWM frequency:||250 kHz|
|Minimum logic voltage:||1.8 V|
|Maximum logic voltage:||7 V|
|Reverse voltage protection?:||Y|
- 1 Without included hardware.
- 2 Typical results with VIN=5 V, VCC=5 V, and 100% duty cycle at room temperature.
- Texas Instruments DRV8837/DRV8838 motor driver datasheet (1MB pdf)
- DRV8838 Single Brushed DC Motor Driver Carrier schematic diagram (154k pdf) Printable schematic for the DRV8838 Single Brushed DC Motor Driver Carrier.
- DRV8838 motor driver carrier dimension diagram (135k pdf) Detailed dimension diagram of the DRV8838 single brushed DC motor driver carrier.
|Part. No. :||2990|
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