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BQ40Z50-R1: No accnolage on the SMBus request.

Part Number: BQ40Z50-R1
Other Parts Discussed in Thread: BQSTUDIO, EV2400

Good afternoon, experts.
I have developed BMS schematic which is slightly different from the evaluation board (see picture).
15V is present on pins VBAT, VCC, PACK.
The microcontroller pulls down PRES pin.
SMB pins are pulled up to 3V with 10K resistors.
Charge and discharge are separated, not connected at the moment.
The microcircuit does not respond to the request at 0x16, no accnolege.
I changed the chips from two different stores.
Could you advise anything?

  • Hello,

    Please verify the functionality with the TI tool chain first before verifying with custom MCU, this would be the EV2400 and bqStudio. You will need both in order to flash the chem ID as well.

    Communication issues usually require some baseline of known working components to eliminate possible sources of error.

    Sincerely,

    Wyatt Keller