Hi all,
I would like a small and simple fuel gauge for a coin cell operated device. I am trying to minimise power consumption as much as possible. I thought the ADS7040 would be ideal but I am wondering whether I should use a load switch to turn it off because I am only going to read battery voltage once every 2 min at most. The SiP32431 for instance has a nA range quiescent current, difficult to beat !
I guess the ADC is meant to be used continuously because I can't find on the datasheet the power consumption when it's off...
Second question: What would be the best way to turn it off ? Stop the clock ? Connect DVDD to a GPIO and turn it low ? Both ? None of the above ?
Thanks !
Datasheets:
https://www.ti.com/lit/ds/symlink/ads7040.pdf?ts=1619617854706&ref_url=https%3A%2F%2Fwww.ti.com%2Fproduct%2FADS7040
https://www.vishay.com/docs/66597/sip32431.pdf
PS: I am not posting any schematics because it is a conceptual question
I would like a small and simple fuel gauge for a coin cell operated device. I am trying to minimise power consumption as much as possible. I thought the ADS7040 would be ideal but I am wondering whether I should use a load switch to turn it off because I am only going to read battery voltage once every 2 min at most. The SiP32431 for instance has a nA range quiescent current, difficult to beat !
I guess the ADC is meant to be used continuously because I can't find on the datasheet the power consumption when it's off...
Second question: What would be the best way to turn it off ? Stop the clock ? Connect DVDD to a GPIO and turn it low ? Both ? None of the above ?
Thanks !
Datasheets:
https://www.ti.com/lit/ds/symlink/ads7040.pdf?ts=1619617854706&ref_url=https%3A%2F%2Fwww.ti.com%2Fproduct%2FADS7040
https://www.vishay.com/docs/66597/sip32431.pdf
PS: I am not posting any schematics because it is a conceptual question