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CC1312R: Question regarding Battery Monitor and ADC reference voltage

Baptiste CHERDLE
Intellectual 300 points
Part Number: CC1312R

Dear all,

I'm performing a low consumption design with the CC1312R MCU and I have questions regarding the battery monitor function and ADC reference voltage:

1- What is the Battery Monitor current consumption ?

2- Regarding the ADC reference voltage, it is mentionned in the datasheet that there is an internal  4.3V equivalent reference. How is this reference generated? How it works ? Does in mean that if I supply the chip between 1.8V to 3.2V I can be able to monitor an input voltage with a 4.3V ADC full scale ?

Thanks in advance for your reply and your support.

Baptiste,

  • 0
    TI__Guru**** 317180 points

    Note that the BATTMON module is controlled by the drivers and is on when the chip is active since both the voltage and temperature information is needed for wanted operation. 

    Reference: See footnote 2) in the ADC part of the datasheet and the "Input Selection and Scaling" in https://www.ti.com/lit/ug/swcu185d/swcu185d.pdf. The input range is 0 V to VDDS as stated in the datasheet. 

  • 0 in reply to TER
    Intellectual 300 points

    Hello Guru, thanks for your reply,

    Ok for the BATTMON, but this module activation current consumption is not defined, I need a very low current consumption and also VDDS monitor, so that's why I'm looking for it. Have you performed test with and without this module and check its current consumption?

    For ADC, ok for the input range between 0V to VDDS.

    If I need to measure an external battery independently of VDDS supply voltage, I plan to use the 4.3V internal reference voltage with a voltage divider in VDDS range. So in this case I can measure the external battery voltage independently of the VDDS supply voltage, can you confirm ? 

  • 0 in reply to Baptiste CHERDLE
    TI__Guru**** 317180 points

    For BATMON, please read "Battery Monitor and Temperature Sensor (BATMON)" ()

    As you see this is monitoring both temperature and voltage. It is also stated which states it's on. You should not try to turn this on or off since it's vital for chip functionality.

    Yes, you can use the internal reference that makes your measurements independent of VDDS.   

  • 0 in reply to TER
    Intellectual 300 points

    ok thanks, that's clear.