For Motor controller design using FOC sensorless prototype, there are 3 B-EMF signals need to be monitored by MCU. So I shall config 3 ADC channels for this purpose. But with ST MC WB there is no way to do this. what can I do?
Bellow is my schematic. U, V, W are 3-phase output to drive motor directly. R6, R8 and R10 provide B-EMF signals, and distribute voltages on R8, R13 and R21 seperately , filtered and smoothed by C1, C5, and C12， clamped on 0.6V by D4、D6、D7，finally connect to Pin 18, 19 and 22 of STM32F302C8, to detect the 0-cross of 3 B-EMF signals.