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BQ79600-Q1: Clarification on BAT supply and VIO pin

Kalpak Gondane
Prodigy 70 points
Part Number: BQ79600-Q1

Tool/software:

1. Does the reverse wake-up function of the BQ79600-Q1 operate only up to 12V, or can it also function with a 24V auxiliary supply applied to the BAT pin?

2. Also, do we need to give supply to VIO pin in sleep mode while using reverse wake-up strategy?

  • 0
    TI__Intellectual 1395 points

    Hello, 

    1. The reverse wakeup function can be operated at a range of 5.5 V to 24 V

    2. VIO - This supply is powered by regulated 3.3V or 5V from SBC (PMIC), it powers UART/SPI interface pins. This is true for both with and without reverse wakeup.

    Thank you for your question,

    Pranav Ananthan

  • 0 in reply to Pranav Ananthan
    Prodigy 70 points

    24V auxiliary battery will have working range of 18V to 28V with nominal voltage of 24V. As per datasheet, maximum working voltage as specified as 40V. So, we are assuming that it should work, please confirm?

    Can I turn OFF VIO supply as it wakes up from INH pin? As a part of sleep mode implementation strategy, we want to turn off supply of peripherals which can remain inactive during sleep mode. BAT will be full time connected to auxiliary battery during sleep time as well as normal mode.

  • 0 in reply to Kalpak Gondane
    TI__Intellectual 1395 points

    Hello, 

    Yes you are correct, if BAT is supplied using the auxiliary supply, then the 5.5 to 40 V range of BAT will work. 

    If the goal is to turn of peripherals while in sleep mode, then turning off VIO won't cause a change of state (for example, sleep to shutdown mode), but only stop any data communication to the MCU. I believe this answers your question. 

    Thank you, 
    Pranav Ananthan