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TMS570LC4357: ADC Not Connected ADREFHI ADREFLO Pins and Internal Referance

enes ozer
Prodigy 40 points
Part Number: TMS570LC4357


Hi,

I have a custom board. The ADREFHI and ADREFLO pins are not connected. VCCAD and VSSAD pins are 3.3V - GND.

Is there internal ADC reference in MCU or is it possible to use VCCAD for reference voltage?

Thanks.

  • 0
    TI__Guru**** 198766 points

    Hello,

    The analog conversion range is determined by the reference voltages: ADREFHI and ADREFLO. ADREFHI is the top reference voltage and ADREFLO is the bottom reference voltage. There is no other internal reference for ADC conversion.