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CC3235MODSF: Minimal Current for ADC to measure

frank lin1
Intellectual 330 points
Part Number: CC3235MODSF
Other Parts Discussed in Thread: LAUNCHCC3235MOD

Hi,
I am using ADC to measure battery's voltage. I know 6V is too high for cc3235, so i use resistance divider to make it to 1.5V.
But the current will be about 6 µA. it was too small, so when i call ADC_open() it will drop.


What is the minimal current if i want to us ADC to measure and wouldn't drop the voltage?

  • 0
    TI__Mastermind 40120 points

    frank,

    According to the datasheet, the average for ADC conversion is 1.5mA. I recommend you replace the voltage divider with an OpAmp instead. See the LAUNCHCC3235MOD reference design.

    Also note that while the ADC pins can tolerate up to 1.5V max, the input range is from 0V~1.4V. 

    BR,

    Seong