BQ27441-G1: Configuring ROM

JDJ

Expert 3831 points

Part Number: BQ27441-G1

In this flowchart I see a configuration ROM, could you elaborate on that?

over 1 year ago

0 Wyatt Keller over 1 year ago

TI__Guru** 104785 points

Hello JDJ,

The BQ27441-G1 is a ROM based gauge, this means anytime the gauge goes through a full reset it will reload all the default parameters from ROM to the RAM locations for processing. This part does not have flash memory where it can save settings and requires the host to re-upload application specific information if power is lost to the gauge.

Sincerely,

Wyatt Keller

0 JDJ over 1 year ago in reply to Wyatt Keller

TI__Expert 3831 points

To confirm, all that means is on power on we need to check the “initialization status” ie. Does it have the expected parameters if we have non-default parameters.
Else, “initialize”, load the non-default parameters.

It will also clear the data on that battery, so we would need to set a flag that a reset took place so that we would know if I have a faulty connection etc.

Please let me know your feedback!

0 Wyatt Keller over 1 year ago in reply to JDJ

TI__Guru** 104785 points

Hello JDJ,

Yes that's correct. The ITPOR bit is used to indicate if the RAM was cleared and the default ROM values were re-loaded to RAM.

Sincerely,

Wyatt Keller

0 JDJ over 1 year ago in reply to Wyatt Keller

TI__Expert 3831 points

Do we have any example code that we could port over?

0 Wyatt Keller over 1 year ago in reply to JDJ

TI__Guru** 104785 points

Hello JDJ,

We have linux drivers for this gauge, they have not been updated for some time but it is a good reference:

https://www.ti.com/tool/BQ27XXXSW-LINUX

Sincerely,

Wyatt Keller

Power management

Power management forum

BQ27441-G1: Configuring ROM