DC Motor 15 Click Board™

Product Code: MIKROE-4334

How Does The DC Motor 15 Click Board™ Work? The DC Motor 15 Click Board™ 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. The DC Motor 15 Click Board™ 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. The DC Motor 15 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. SPECIFICATIONS Type Brushed Applications Can be used for a brushed DC and servo motor and actuator drive, home appliances, handheld power tools, and many more. On-board modules The DC Motor 15 Click Board™ 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. Key Features High output current capability, integrated current sensing and regulation, proportional current output, selectable current regulation and control modes, low power consumption, and more. Interface GPIO Compatibility mikroBUS Click board size M (42.9 x 25.4 mm) Input Voltage 3.3V or 5V PINOUT DIAGRAM This table shows how the pinout of thenC Motor 15 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes Pin Pin Notes Analog Current Output IPR 1 AN PWM 16 IN1 Motor control input 1 Sleep Mode SLP 2 RST INT 15 FLT Fault Indicator Motor Control Input 2 IN2 3 CS RX 14 NC NC 4 SCK TX 13 NC NC 5 MISO SCL 12 NC NC 6 MOSI SDA 11 NC Power Supply 3.3V 7 3.3V 5V 10 5V Power Supply Ground G