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BQ27542-G1: Exiting Hibernate Mode and SoC Accuracy

Andrew Morrison35
Prodigy 10 points
Part Number: BQ27542-G1

Hi,

I am currently designing a battery pack for an application where the device can spend long periods of time (up to months) in a low power state (~100uA at 3.7V). I am considering using the BQ27542-G1 as the pack side gauge due to the low hibernate mode current and authentication. About exiting hibernate mode, the datasheet says:

"Once the gauge exits to NORMAL mode, the IT algorithm will take about 3 seconds to re-establish the correct battery capacity and measurements, regardless of the total charge drawn in HIBERNATE mode)"

and

"If necessary, the host equipment can draw a small current (generally infrequent and less than 1 mA, for purposes of low-level monitoring and updating); however, the corresponding charge drawn from the battery will not be logged by the gauge."

Is the BQ27542-G1 a good choice for our application since we will be drawing a very small amount of current continuously for a long time? How accurate will this capacity measurement be after exiting from hibernate mode? Any clarification on this would be helpful.

Thanks,

Andrew

  • 0
    TI__Intellectual 1840 points
    This gauge should be fine for this application. The accuracy is dependent of having a proper CHEM_ID programmed and a successful learning cycle and correctly selected parameters, this also true for the measurements after exiting hibernate mode.