TIDUF36A May 2023 – December 2023 DRV8328
The MSPM0G1507 incorporates two zero-drift, zero-crossover op amps with programmable gain among other high-performance analog peripherals. Low-side current measurements are commonly used to implement overcurrent protection, external torque control, or brushless DC commutation with the external controller. One of the integrated op amps on the MCU can be used to sense the sum of the half-bridge currents. The gain of the current sense measurement can be configured with software and requires no additional components beyond the current sense resistors and input series resistors.
The OPA peripherals also support the following key features for current sensing:
The output of the op amp is read directly by the one of the channels of the integrated 12-bit successive approximation (SAR) ADC on the MCU. The voltage across the OPA+ and OPA– pins is multiplied by the selected programmed gain of the op amp (PGA).