BQ34Z100-R2: ROM mode ID command

Tomasz Ciesla

Part Number: BQ34Z100-R2
Other Parts Discussed in Thread: BQ34Z100

Tool/software:

hi, during production flashing some devices fail and I have to modify the production SW to check if the BQ34Z100 is in FW or ROM mode. Is there a get ID command which I can send to the I2C address 0x16 to confirm that IC is alive in ROM? like DEVICE_TYPE in FW mode?

11 months ago

0 Adrian 11 months ago

TI__Mastermind 37761 points

Hello Tomasz,

I am currently looking into this. Will get back to you soon.

Regards,

Adrian

0 Adrian 11 months ago in reply to Adrian

TI__Mastermind 37761 points

Hello Tomasz,

Check out this link and let me know if this helps: https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1288151/bq34z100-g1-how-to-exit-rom-mode

Regards,

Adrian

0 Tomasz Ciesla 11 months ago in reply to Adrian

Intellectual 690 points

hi, my problem is that occasionally during production, flashing is interrupted and I have some ICs stuck in ROM. Before flashing using .fs file I check if BQ is @0x55 on I2C bus using DEVICE_TYPE command. I can assume that if no response it is in ROM and skip initial part of .fs file dedicated entering ROM. But ideally I would like to ask @0xb (ROM) and a sort of "get device type" command to be sure that IC is alive in ROM.

+1 Adrian 11 months ago in reply to Tomasz Ciesla

TI__Mastermind 37761 points

Hello Tomasz,

I don't believe there is a command for this. However, you can try reading StateOfCharge and see if it returns a value between 0 to 100. If it returns a value not in this range then the gauge could be in ROM mode. This is what we do for our SMBus gauges to check.

Regards,

Adrian

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BQ34Z100-R2: ROM mode ID command