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Original question:

[FAQ] BQ40Z80 FAQs

BQ40Z80: Pin config not to use LED and DISP

Masami Akazawa
Intellectual 505 points
Part Number: BQ40Z80

Hi team,

Please tell me how to set the bq40z80 not to use the LED and DISP button.

With the following parameters, the charge FET cannot be turned off even if FET_TOGGLE is set.

Note, I accidentally set LED to use before setting the parameters.


circuit
・pin12:TS3
・pin13:connected to GND
・pin15:connected to GND
・pin16:connected to GND
・pin17:PRES
・pin20,21,22:connected to GND with register.

parameter
old(I accidentally set)
・"Settings","Configuration","Pin Configuration","03c1","hex"
new
・"Settings","Configuration","Pin Configuration","83e1","hex"

Best Regards,
Masami

  • 0
    TI__Guru 57697 points

    0x83e1 seems fine. It is best to reset the gauge after changing pin settings.

    The charge FET behavior is probably unrelated. See the following TRM section for more information on settings for Charge FET. The gauge controls charge FET under certain conditions

    19.2 Settings 19.2.1 Configuration 19.2.1.1 FET Options