This page outlines the SPI configurations for the DRV gate driver, and the component selections for the circuitry surrounding the MCU
Current Sense (Only used for FOC):
For the SPI version of the IC that we have, you do not use a resistor to set the gain, instead you set a bit in the chip:
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To select a current sense resistor, we need to consider the power loss throough the resistor and make sure it’s rated for it, as well as the voltage drop across the resistor that will be sent to the CSA so that we know we are making the most out of our 0 to 3.3V range.
https://www.digikey.ca/en/products/detail/vishay-dale/WSLF25122L000FEB/6194694
Bulk Capacitance:
Phase VSENSE Feedback:
The MCU and control algorithm needs to know the phase voltages at all times to control the timing of the commutation. This is done through a voltage divider from the phase voltage to an ADC pin on the MCU
The maximum voltage we prepare for on any phase is 60V. The maximum input voltage of the STM ADC is 3.3V. Therefore, we can map 60V to 3.2V to make use of our whole voltage range. Resistors chosen have a slightly high power rating as they are exposed to higher voltage and will be able to have better thermal performance
R1 - 18k 1/3W 0603: https://www.digikey.ca/en/products/detail/panasonic-electronic-components/ERJ-PA3F1802V/5035880
R2 - 1k 1/3W 0603: https://www.digikey.ca/en/products/detail/panasonic-electronic-components/ERJ-PA3F1001V/5035848
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