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What is the cell balancing input resistance of unpowered LTC6811 chip?

Category: Datasheet/Specs
Product Number: LTC6811-1

Considering the off-state LTC6811 , if the chip cell inputs still connected to the battery cells, what is the internal impedance of those inputs? By the word "unpowered" I mean the MCU is not communicating with the chip over SPI and it is in it's inactive mode (neither balancing nor monitoring) . This important parameter is not provided in the datasheet. This will allow to know if external charger still can be connected and charge the battery while unpowered LTC6811 still connected to it.



Considering the off-state LTC6811 , if the chip cell inputs still connected to the battery cells, what is the internal impedance of those inputs? By the word "unpowered" I mean the MCU is not communicating with the chip over SPI and it is in it's inactive mode (neither balancing nor monitoring) . This important parameter is not provided in the datasheet. This will allow to know if external charger still can be connected and charge the battery while unpowered LTC6811 still connected to it.
[edited by: ebirdman at 6:09 PM (GMT -4) on 30 Apr 2024]
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  • The impedance is the normal +/-250nA input leakage for discharge switch off and no ongoing measurement.  The switches remain off by default.  An external charger may still be connected to the battery in this case, but of course the LTC6811 won't do anything unless provided V+ power and commanded to.

  • Good answer, thank you. Please extend this information to the same chip communicating with MCU for monitoring purpose but not balancing. Is the input leakage current will still be low enough to allow for external charger while LTC6811 does monitoring?

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