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TIDA-010031: TIDA-010031 Schematic clarification

Part Number: TIDA-010031
Other Parts Discussed in Thread: MSP430FR2355


I need some clarification on TIDA -010031 schematic for following question:

1) In schematic U_BEMF,V_BEMF,W_BEMF,BEMF_C is connected to ADC(A7,A6,A5,A4) pin no 31,32,33,34 respectively but resistors divide network one end should be connect to Gnd for measurement , but in schematic it is not there .

what is the reason behind this and how the U_BEMF,V_EMF,W_BEMF measured ?

2) Again in schematic W_BEMF,U_BEMF,BEMF_C is connected to pin 41,10,37 of controller . Pin 41 and 10 is either act as GPIO or Comparator input. And pin 37 either act as GPIO or Opamp 3 output as per controller MSP430FR2355 datasheet 

what is the reason  and logic behind this?

3) How U_ctrl,V_Ctrl and W_Ctrl (Pin 45, 36, 35 respectively) is sensed by controller without any GND reference and why we need this ?

Please find the Schematic with highlighted

Thanks & Regards

Dhiren SahooSchematic queries for highlighted point.pdf

  • Hi,

    1.2.For back-EMF measurement, you can read "2.4.2 BEMF Detection" in the user guide.It explains in detail the calculation of BEMF

    3.For this application, use MCU to control U, V, W_Ctrl, pull up and pull down to switch BEMF paths PWM-on and PWM-off .Can reduce the impact of PWM.