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ADS1278: ADS1278 design Battery Cell measurement 1~16 Series

Cao Cao
Intellectual 770 points
Part Number: ADS1278
Other Parts Discussed in Thread: ADS1178, , ADS131A04, ADS131E08

Hi Sir,

I plan ADS1178 and ADS1278 design Battery Cell measurement 1~16 Series now.
and prefer 16Bits so I think ADS1278, but currently  concern common mode voltage since 16 cell battery maxmium voltage is 80V.
if ADS1178 and ADS1278 cannot to do. please help suggest our solution. thanks.

Application Battery Cell Sync to do measurement 1~16 Series

  • 0
    TI__Guru 57336 points
    Hi Cao Cao,

    Thanks for your post!

    Do you need to measure the voltage across each battery cell simultaneously? If the maximum voltage across 16 battery cells is 80V, then you will need an ADC which can support a 5V differential input voltage, which the ADS1x78 cannot measure directly. The maximum reference voltage on the ADS1x78 is 3.1V. You will need to attenuate the input voltage before driving it to the ADS1x78 inputs.

    Also, I understand that the common-mode voltage of each cell will be different and this is a concern. Let me look into this further to find the right input stage/ADC combination that might work for you.

    Best Regards,
  • 0 in reply to Ryan Andrews
    TI__Guru 57336 points
    Hi Cao Cao,

    Adding to my comments above:

    Typically an instrumentation amplifier is used to bring the common-mode voltage to within the range of the ADC. You may want to post a similar question to the precision amplifiers forum and explain your exact input voltage requirements to find the right INA.

    Out of curiosity, what led you to consider the ADS1278 for this application? Do you need to measure both DC and AC signal content? Another option might be the ADS131E08 or ADS131A04. Both of these devices are also simultaneous-sampling delta-sigma ADCs, but the digital filter is a sinc filter with a lower passband and faster settling. The ADS1278 has a wideband FIR filter instead.

    Best Regards,