BQ27500-V120: I2C lines held low after DFI programming

Andrei Jakab

Part Number: BQ27500-V120
Other Parts Discussed in Thread: BQSTUDIO, BQ27510, BQ27500

Hello,

After implementing and running the DFI programming flow described in figures 8, 9, and 10 of Going to production with BQ275xx (slua449f), the gas gauge is keeping the SDA and SCL low. No I2C errors were reported and ROM register 0x66 was 0 every time it was checked during the programming process. Also, I made sure to flash a DFI that matched the firmware version running on the gauge (120).

1) Does this mean that the gas gauge is bricked? If so, is there any way to bring it back into operating mode?

2) What is the recommended way of developing and testing the DFI programming code? I would hate to brick multiple gauges while fixing bugs.

3) If an error occurs at any point during the DFI programming flow, should the gas gauge be left in ROM mode so that it can be fixed via an external tool (e.g., EVSW)?

Thank you in advance for your help.

Andrei

over 7 years ago

0 Damian Lewis over 7 years ago

TI__Mastermind 34665 points

Hi Andrei,

Someone should respond to your post next week.

0 Onyx Ahiakwo over 7 years ago in reply to Damian Lewis

TI__Guru* 76230 points

Hi Andrei,

I recommend using the flashstream method to program the gauge. That might be easier. See attached folder containng sample code to program the device using an msp430 and the flash stream format. There is an app note in the folder that describes the process. Also, ps review the read me document in the folder.

Given the bq27500 is a really old device, bqstudio does not support it. i recommend using the bq27520 or the bq27510.. However you can extract the flashstream file using the TI_flashstream_installer_v0.27 contained in the folder.

FlashStream028_bundle (3).zip

thanks

Onyx

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BQ27500-V120: I2C lines held low after DFI programming