BQ28Z610: Data Flash Access Issues

silomilo

Part Number: BQ28Z610
Other Parts Discussed in Thread: BQSTUDIO

Hi all, I'm trying to integrate this fuel gauge into our product and am having trouble with writing to the data flash region. I am able to read values and they are as expected but writing has no effect. For example for register 0x4600 (FET Options) I do the following to read:

[Start Condition] [I2C Write] [0x3E, 0x00, 0x46] [I2C Read] [0x20]

Which reads 0x20 as is the default value. Then I attempt to write the value:

[Start Condition] [I2C Write] [0x3E, 0x00, 0x46, 0x00]

However when I read the value back again I still read 0x20. Am I missing something? Does something need to be enabled to allow me to write?

over 7 years ago

0 Batt over 7 years ago

TI__Mastermind 42535 points

you need to write the checksum. without that writes will not get committed.

0 silomilo over 7 years ago in reply to Batt

Intellectual 320 points

Could you please let me know where this is described? I'm reading section 12.2.45 and see no mention of it.

0 silomilo over 7 years ago in reply to Batt

Intellectual 320 points

I've been trying to find in the reference manual where this procedure is described but I cannot. I see reference to sealed and unsealed mode and various keys that are involved with transitioning. I need more details on why my data isn't being set and what I need to do to allow it to write to data flash.

0 Batt over 7 years ago in reply to silomilo

TI__Mastermind 42535 points

Daniel,

I'm sorry that the device does not lend itself to operation like that. The standard procedure here is to use bqstudio to change the df and that will write the checksum when the df parameter is changed. For mass production such a modified srec will be flashed on to other gauges.

The procedure for writing df is not public. I suggest that you use bqstudio to get writes committed to df.

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BQ28Z610: Data Flash Access Issues