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Board Designer - Bus Voltage Sensing documentation needed

shane mattner
Senior

I'm trying to make a custom board project with Board Designer and found the documentation lacking for entering the correct parameters.

 

The Bus Voltage Divider needs to be equal to 1/(voltage divider ratio). Also, the resistors on the Board Designer are not labelled so I had to guess and reference the wiki.

 

So for me using a 51k and 4.99k voltage divider I needed a Bus Voltage Divider value of 11.223344V.  This number doesn't make sense to me as an engineering value. There's also no direct documentation for calculating this value either.

 

shanemattner_0-1731006862226.png

 

From the wiki

https://wiki.st.com/stm32mcu/wiki/STM32MotorControl:Motor_Control_Boards_Description#Bus_voltage_measurement

shanemattner_1-1731007269591.png

 

 

 

After calculating this value the bus voltage readings are accurate for me.

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