LTC2497

Can you confirm/answer the following:

1) The LTC2497 can be used to measure individual battery cell voltage where each cell is 3.2v, where 8 are in series to make a 24v pack. Just to be clear, I am not going to attempt to measure anything more than 4v. The whole pack voltage will be measured by a different ADC. I am not confident in my understanding of the "common mode voltage" terminology.

2) Is there a software library for arduino usage?

3) I need to power the chip with 3.3v to be used by an ESP32. If REF- is 0 relative to Vcc, then REF+ can be 3.9v and therefore I can measure the cell voltages to 3.6 correct?

Thanks,

jt



more clarifying
[edited by: johntaves at 3:56 AM (GMT -4) on 8 Sep 2020]
  • 0
    •  Analog Employees 
    on Sep 10, 2020 3:28 PM 5 months ago

    If the batteries are in series, even though each battery is only 3.2V, the battery at the top of the stack will be at 25.6V. The highest voltage that can be directly measured by the LTC2497 is Vcc + 0.3V. You can attenuate the input voltage as one way to get around this. A better solution might be to use a battery monitor IC intended for this purpose such as the LTC6811-1.

    There is Linduino code available that is software compatible with the arduino

    If Vcc is 3.3V, that is the highest Vref you can use.