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MAX17055 changes DesignCap value

Category: Software
Product Number: MAX17055

Hi there,

i set up the EZ config method like it is written in the software implementation guide.

So i send the following parameters for my Varta Coinpower A4:

"DesignCap":"0x009B",
"dQAcc":"0x0004",
"IChgTerm":"0x0133",
"VEmpty":"0x8C52",

The parameters are written correctly to the device. After some time the DesignCap value changes from 0x9B (155mAh) to 0xBB8 (3000mAh).

Can somebody explain to me why this occures?

And a second question:

There is the Rsense/UserMem3 register (Adr. 0xD0). Is it okay to save the used rsense value there? I want to save it there to calc the current values based on this value.

Or is this register updated automatic, because when i read it there is just the value 0.

I am looking forward to a response.

Best regards,

Patrick

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[edited by: GenevaCooper at 2:32 AM (GMT -5) on 6 Dec 2023]