DC Motor 15 Click is a compact add-on board that contains a motor driver with current sense and regulation. This board features the DRV8874, an integrated motor driver with N-channel H-bridge, charge pump, current sensing, and adjustment from Texas Instruments. Current sensing and regulation feature eliminates the need for a large power shunt resistor, saving board area, and reducing system cost. The current-sense output allows an MCU to detect motor stall or changes in load conditions. The DRV8874 can also regulate the motor current during Start-Up and high-load events without interaction from MCU. This Click board™ is suitable for a brushed DC and servo motor and actuator drive, home appliances, handheld power tools, and many more.
DC Motor 15 Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.
DC Motor 15 Click is based on the DRV8874, an integrated motor driver with N-channel H-bridge, charge pump, current sensing and proportional output, current regulation, and protection circuitry from Texas Instruments. The DRV8874 operates from the external power supply from 4.5V to 37V providing a wide range of output load currents for various types of motors and loads. The charge pump feature improves efficiency by supporting N-channel MOSFET half-bridges and 100% duty cycle driving. This Click board™ also integrates current sensing, regulation, and feedback. These features allow for the DRV8874 to sense the output current without an external sense resistor or sense circuitry reducing system cost and complexity. This also allows for the device to limit the output current in the case of the motor stall or high torque events and give detailed feedback to the MCU about the load current through a current proportional output on the AN pin of the mikroBUS™ labeled as IPR.
The DRV8874 integrates an H-bridge output power stage that can be operated in different control modes set by the PMODE pin setting. The PMODE pin on this Click board™ is set to a logic low level that means that the device is latched into PH/EN mode. PH/EN mode allows for the H-bridge to be controlled with a speed and direction type of interface through two GPIO pins labeled as IN2 and IN1, routed to the PWM and CS pins of the mikroBUS™ socket. It also has a Sleep Mode that achieves ultra-low quiescent current draw by shutting down most of the internal circuitry. The SLP pin routed to the RST pin of the mikroBUS™ socket provides an ultra-low power mode to minimize current draw during system inactivity.
DC Motor 15 Click communicates with MCU using several GPIO pins as mentioned before in the product description. In addition to the pins used to adjust the speed and rotation direction of the motor, this Click board™ also has an interrupt labeled as FLT routed to the INT pin of the mikroBUS™ socket used to protect the device and the output load. The DRV8874 enters a Fault Mode when a fault is encountered, and leave the Fault Mode, and re-enter the Active Mode when the recovery condition is met.
This Click board™ is designed to be operated with both 3.3V and 5V logic voltage levels that can be selected via VCC SEL jumper. This allows for both 3.3V and 5V capable MCUs to use the GPIO lines properly. However, the Click board™ comes equipped with a library that contains easy to use functions and an example code that can be used as a reference for further development.
- Interface: GPIO
- Compatibility: mikroBUS™
- Dimensions: 42.9 x 25.4mm
- Input Voltage: 3.3V or 5V
- Maximum Output Current: 6A
- Current sense output current: 3mA
- Operating Temperature Range: Min. -40°C, Max. +125°C