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BQ76942: Sleep mode

TATSU Numa
Intellectual 800 points
Part Number: BQ76942

Hi Team 

 Let me ask 2 query from customer.

1). Regading to sleep mode, when the devise transion into sleep mode from normal mode, how long should the state below the current threshold be detected before transition into SLEEP MODE?

    And could we set time range?

2).Are there any conditions for transion from NORMAL MODE to SLEEP MODE other than transion from NORMAL MODE to SLEEP MODE at the current threshold?  
   (For example, MODE transition by instruction from the microcomputer, etc.)

best regards

TATSU

  • +1
    TI__Mastermind 24906 points

    Hello TATSU,

    1- The BQ76942 will transition to Sleep Mode autonomously when CC1 current is less than Power:Sleep:Sleep Current. The specific time for entering sleep mode is not established in documentation. There's Power:Sleep:Sleep Hysteresis Time which will ensure the device does not enter sleep mode again after transitioning to normal mode, but I do not think this will prevent to go from Normal to Sleep Mode.

     There's a one second interval in firmware where the BQ76942 takes decision to enter or not in sleep mode. So, the delay to enter sleep mode can be up to 1 second.

    2-  Short answer is no. But, the device has the SLEEP_ENABLE() and SLEEP_DISABLE() commands which can be used to control Sleep Mode (not sure if this will help with the delay).

    Regards,
    Jose Couso

  • 0 in reply to Jose Couso
    TI__Intellectual 800 points

    Hi Causo

     Thank you for your response.

    And let me ask furture question from customer.

    １）What is the current sampling interval used for charge integration?

    　　I think that the calculation of charge integration is probably performed every second...

    2)When are the CC1 and CC2 filters applied respectively?

    best regards

    TATSU

  • +1 in reply to TATSU Numa
    TI__Mastermind 24906 points

    Hello TATSU,

    1- The BQ76942 uses the CC1 Current() measurements for accumulated charge integration. The CC1 Current() measurement is reported every 250ms while in NORMAL mode. 

    Note:  CC1 Current() data is reported in 16-bit format through the DASTATUS5() subcommand. The accumulated integrated charge is reported using a 64-bit format through the DASTATUS6() subcommand.

    2- CC2 Current() measurement is provided every 3ms in NORMAL mode. 

    Please see this technical article for more details on current measurements.

    Regards,
    Jose Couso