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BQ34110: Time from power on until BQ34110 responds on I2C

Johannes Klasson
Prodigy 40 points
Part Number: BQ34110

Hi,

We are developing our own platform where the BQ34110 is one of the components. During start-up we want to read out several parameters from the BQ34110, but it seems like it has a very long start-up time before it responds on I2C. It takes around 280 ms from power on until it answers with an acknowledge when being addressed. We are sending with a frequency of 100kHz. So I'm wondering if:

1. Are we seeing an unusual long start-up time or is this normal?

2. Is the start-up time defined, so that we know how long we need to wait before we know that the BQ34110 is up and running and can respond on I2C? Or is the start-up time defined within a known interval?

Br,

Johannes

  • 0
    TI__Mastermind 25955 points
    Hi Johannes,

    Is power being removed from the device? The device should be powered and not constantly reset once initialized.

    When initially powered up, the device must execute firmware and takes longer to 'bring up' than from a shutdown mode.

    There is no definition for the start-up time in the datasheet, however, when the device is in sleep mode, typical current consumption is 22 uA and may incur a 6-8 ms clock stretch while the high frequency oscillator is started and stabilized.

    Sincerely,
    Bryan Kahler
  • 0 in reply to Bryan Kahler
    Prodigy 40 points
    Hi,

    Yes, in some very rare occasions the power to the platform, and therefor also the BQ34110, will be removed. And even though these occasions will be very rare, they still need to be handled by the system. It is also the same case during the very first start-up of the system, since the whole platform will be powered at once.
    So there is no typical or maximum time that the system can expect the BQ34110 to take when initially powered?

    Br
    Johannes
  • 0 in reply to Johannes Klasson
    TI__Mastermind 25955 points
    Hi Johannes,

    There is no value given for the start up time in the datasheet. Please be aware that by removing power from the gauge it will reset, which may be undesirable.

    Sincerely,
    Bryan Kahler