Product description: DRV8874 - single-channel 37 V / 2.1 A motor driver - Pololu 4035
Single-channel DC motor driver from Pololu equipped with the DRV8874 system. It is supplied with the voltage from 4.5 V to 37 V. The continuous current per channel is 2.1 A (temporary up to 6 A for 1 second). It allows you to easily control the speed and direction of rotation of the motor, using only two pins of the microcontroller. The controller is also equipped with protection against reverse polarity, too low voltage, too high current and too high temperature.
Single-channel DC motor driver - DRV8874. 
Connection of the DRV8874 motor driver.Connecting the DRV8874 driver
The motor supply voltage in the range from 4.5 V to 37 V should be connected to the VIN or VM pin. In a typical application, it is enough to connect two control lines: the selection of the PHASE rotation direction and the PWM speed regulation to the ENABLE pin. By default, the controller is in sleep mode - to exit it, the SLEEP pin must be supplied with a voltage in the range from 1.8 V to 5.5 V. DRV8874 offers three possible control modes:
- PHASE / ENABLE (PH / EH)
- PWM (IN / IN)
- Via an independent half-bridge
| The pins of the DRV8874 driver | ||
|---|---|---|
| Pin | Default state | Description |
| VIN | Input voltage from 4.5 V to 37 V. | |
| GND | The mass of the system for the engine and logic. | |
| VM | Pin that gives access to the motor's power supply after activation of the MOSFET protection against reverse voltage. It can be used to power other system components with reverse polarity protection. | |
| OUT1 | Engine output 1. | |
| OUT2 | Motor output 2. | |
| EN / IN1 | LOW | Pin 1 for motor turn ON / OFF PHASE / ENABLE (PH / EH). |
| PH / IN2 | LOW | Pin 2 to control the direction of rotation of the motor PHASE / ENABLE (PH / EH). |
| FAULT | FLOATING | Open-drain, fault output activated with low state. The pin goes low after exceeding the permissible current or voltage. Must be pulled up with a resistor, to be high by default. |
| SLEEP | LOW | The SLEEP input causes the controller to enter the low power state after entering the low state. This pin can also be switched to clear a stuck over current or over temperature fault. |
| VREF | Current limiting threshold reference voltage. | |
DRV8874 motor driver specification
- Number of channels: 1
- Supply voltage: 4.5 V to 37 V
- Continuous current per channel: 2.1 A
- Instantaneous current per channel: 6 A.
- Maximum PWM frequency: 100 Hz
- Minimum logic voltage: 1.8V
- Maximum logic voltage: 5.5V
- Reverse polarity protection
- Dimensions: 15.2 x 17.8 mm
- Weight: 0.9 g
Diagram of the DRV8874 driver. 
