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BQ2022A: Programming Circuit Example

Ryo Akashi
Genius 9470 points
Part Number: BQ2022A

Hello experts,

I got question about programming circuit example from customer.
Why do you set two 100 ohm resistors? Could you tell me the hardware setting point?
Also, I would appreciate if you would share me the additional material about hardware setting.
Thanks and best regards,
Ryo Akashi
  • 0
    TI__Guru 54715 points

    Hi Ryo,

    The SDQ line is used for both communication and programming.  SDQ operates at 3.3V for a high level for communication, but goes to 12V for programming. During programming the MCU must be protected from the 12V if needed.  The right 100 ohm limits  current into the 5.6V zener diode.  The left 100 ohm limits current from the zener clamp level to the MCU.   Other circuits which allow bi-directional data while limiting the voltage to the MCU should also work.

    Information on communicating with and setting the BQ2022A is described in the data sheet, see section 7.5.

  • 0 in reply to WM5295
    TI__Genius 9470 points

    Hello WM5295,

    Thank you for your comment.

    I understand the details.

    Thanks and best regards,

    Ryo Akashi