HOW DOES IT WORK?

Brushless 26 Click is based on the DRV8317H, a three-phase PWM motor driver from Texas Instruments. Its integrated protection features include VM undervoltage lockout, VM overvoltage protection, charge pump undervoltage, overcurrent protection, overtemperature warning and shutdown, and fault condition indication pin. The motor driver provides two configurable schemes, a 6x or a 3x PWM, which can be used to implement sensor or sensor-less field-oriented control (FOC), sinusoidal control, or trapezoidal control using an external microcontroller. It is capable of driving a PWM frequency of up to 200KHz.

To control all high and low side driver control inputs of the DRV8317H, Brushless 26 Click features the PCA9538A, a low-voltage 8-bit I2C I/O port with interrupt and reset from NXP. Besides driver control inputs, this I/O port also controls the Sleep mode of the motor driver. The BLDC motor can be connected over the screw terminal, labeled U, V, and W. Additional screw terminal is just aside for connecting an external power supply in a range of 4.5V up to 20V.

The DRV8317H is a hardware variant of this motor driver, so the Brushless 26 Click is equipped with jumper selections of the gain, slew, and mode; by default, all three are set to 0. This way, you can set the current sense amplifier gain (GA) and output slew rate (SW) through pin voltage levels. The mode jumper (MD) allows you to use a 6x or 3x PWM mode. The 6x PWM is set by default. Additionally, three current sense amplifiers are available over the 4-pin header labeled A1, A2, and A3.

Brushless 26 Click uses a standard 2-wire I2C interface of the PCA9538A to communicate with the host MCU, supporting clock frequencies up to 400kHz. The I2C address of the PCA9538A can be set over the ADDR SEL jumpers, where 0 is selected by default. If a fault condition occurs, the DRV8317H will pull the FLT pin to a low logic state. The RST pin resets the PCA9538A I/O port.

This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, this Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used as a reference for further development.

SPECIFICATIONS