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How to config ADC ports for B-EMF detection with ST MC WB?

Question asked by frank chen on Dec 20, 2017
Latest reply on Dec 21, 2017 by AvaTar

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.