BQ25190: BQ25190

Joe Grehan

Prodigy 20 points

Part Number: BQ25190

Tool/software:

Att:, Samuel Svensson

Need some advice regarding an observation with the BQ25190

We noticed that the I2C locks up easily, if there is a small interruption on the lines.

Most ICs can recover from this or can be recovered by bit banging a clk signal to get the device to release the lines

With the BQ25190 it seems to lock up completely and the only way we can recover is to activate a MR.

Have you come across this issue before or can you offer any advice on how we can avoid a full reset

2 months ago

0 Alec Lehman 2 months ago

TI__Genius 9255 points

Hi Joe,

Thanks for reaching out. I have a few questions to help narrow this down:

Is there a consistent bus state when I2C is locked? Is SDA low while SCL is high? Is SCL stuck low?
When you tried bit banging SCL, did you also generate a STOP (SDA rising while SCL is high) after 8 to 16 clocks?
Are the interruptions on SDA and SCL intentional (for testing) or naturally occurring in your system?
Could you share scope captures (showing SCL and SDA) of the stuck condition and a normal transaction for comparison?

I agree that resetting the device isn't ideal. Once we understand what the bus is doing when it gets stuck, we can work on a better way to recover and prevent it from happening.

I also recommend this app note: I2C Stuck Bus: Prevention and Workarounds

Best regards,

Alec

0 Juan Ospina 2 months ago in reply to Alec Lehman

TI__Mastermind 18450 points

This discussion will be continued in this thread.

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1565378/bq25190-bq25190

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BQ25190: BQ25190