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BQ40Z80: lost communacation when setting TSint & TS4

Bruce li
Genius 5580 points
Part Number: BQ40Z80
Other Parts Discussed in Thread: BQSTUDIO, , , EV2400

Dear TI Experts,

My customer is evaluating with 4800_0_02-bq40z80.bqz +bqStudio 1.3.86+EV2400+BQ40Z80EVM-020 , after setting TSint & TS4 to 1, the commucation will lost and can't recover. They change a new BQ40z80 sample and do the reproduction test and get the same result. Could you kindly help to give some advice about this case? Is there updated FW for BQ40z80? Thanks a lot.

  • 0
    TI__Guru* 81035 points
    Hi Bruce,

    There are 2 different ways to communicate with the BQ40Z80 - there is an EV2400 circuit on the EVM or you can use an external EV2400 module.

    Can you check with these two threads below to see if your issue might be similar?
    e2e.ti.com/.../2636017
    e2e.ti.com/.../717072

    When you enable TS4, do you have a thermistor connected to TS4? Is it possible you are encountering an open thermistor permanent fail (see Section 4.22 of the TRM)? The device might be opening the FET in response to this fault condition. The other thing to consider is that TS4 and TS3 are multi-function pins so they must be configured for temperature sensing before you can enable to the temperature sensor.

    Best regards,
    Matt
  • 0 in reply to Matt Sunna
    Genius 5580 points
    Dear Matt,
    Thanks for your support, you are right, my cusomer fogot to configure to TS4 before using.