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BQ34Z100-G1: Time from reset to get valid reading

Roger Hickey57
Prodigy 220 points
Part Number: BQ34Z100-G1

Hello,

I am working with a system that uses a bq34z100-g1 fuel gauge chip to determine the health and welfare of the battery.

The system has a switch that enables and disables the battery.  The bq34z100-G1 chip is always powered via a separate supply.

When we enable the battery, we send a reset via I2C to the bq34z100-G1.

-> How long after we send the reset will we get valid readings for the battery?

(We read temperature, current, voltage, and SOC)

-> how long after power up do we need to wait to send a reset?

Thanks for your help !

Roger

  • 0
    TI__Genius 14985 points
    In the first second it will take voltage, current, and temperature measurements and you should give it another second to complete its initial simulation. Note that you want to have current at as low as possible (preferably C/10 or less) so that the voltage is as relaxed as possible during the initial measurement.
  • 0 in reply to dMax
    Prodigy 220 points
    Hi,

    Thank you but I am still a little unclear.

    1) I power up
    2) I wait a minimum of ??? until I send a reset
    3) I wait a minimum of 1 sec until after reset until I can read a valid temp, current, and voltage
    4) I wait and additional ???? until a valid SOC reading will be available

    Thank you,
    Roger
  • 0 in reply to Roger Hickey57
    TI__Genius 14985 points
    Hi Roger,
    After you power up a reset is not necessary unless there is a large current spike in the first second. If the current spikes in the first second but you can reduce it when your system is powered up then a reset at that point (however long it takes) is a good idea.
    After either power up or a reset then waiting 4 seconds should be plenty to ensure you get valid voltage, temperature, current, and SOC readings.