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monitoring battery using ADC on CC2531

Mario Hernandez
Intellectual 695 points

Other Parts Discussed in Thread: CC2531, CC2530

Hello TI folks,

I am planning on using the CC2531 as a battery monitor (powered by a 3.6 V battery and a 3.3V LDO). The configuration should be the following but I am not sure:

-ADC reference: internal reference

-ADC input: Vcc/3 

That way, when the battery level goes under 3.3V the LDO's ouput should go under 3.3V too and I should be able to detect this through the ADC. 

Am I wrong here? the thing is that I am not sure whether I can measure 3.3V or less using the internal reference   

Thanks for your answers and ideas

Regards

  • 0
    TI__Genius 16570 points
    Hi,
    you can measure up to 3.45 V. The internal reference voltage is set as 1.15 V (please check the datasheet available at www.ti.com/product/CC2530) and since you are measuring VDD/3, that is the max voltage you can measure.
    Please check the example code in hal_adc.c module for an implementation of an ADC driver that supports battery measurement.
    The ADC supports up to 12 ENOB conversion so that should give you enough resolution for your design.

    Thanks,
    TheDarkSide
  • 0 in reply to TheDarkSide
    Intellectual 695 points
    Thanks for the quick answer. Right, so I'll do it that way, so I do not have to use any ADC GPIO input from the MCU

    Cheers