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BQ25619E: ITERM automatically updated to 100 at cool temperature

Maxime GUILLOT
Prodigy 200 points
Part Number: BQ25619E


Tool/software:

Hello,

I'm testing charging a battery at cool temperature (5°C) .

Here are the registers programmed on the battery charger at startup:

REG00 0x05
REG01 0x1A
REG02 0x8A
REG03 0x00
REG04 0x9D
REG05 0x8F
REG06 0x66
REG07 0x55
REG08 R
REG09 R
REG0A R
REG0B R
REG0C 0xB5

At cool temperature here are what I read:

REG00 0x05
REG01 0x1A
REG02 0x8A
REG03 0x04
REG04 0x9D
REG05 0x8F
REG06 0x66
REG07 0x55
REG08 0x34
REG09 0x03
REG0A 0x80
REG0B 0x44
REG0C 0xA5

As you can see, REG03 automatically switch to 0x04 ITERM=100mA instead of 20mA.

Even if I write 0x00 back to REG03, it keeps automatically updating to 0x04.

I have tried changing REG0C to 0xF5 (100% Ichg at cool temp), REG03 register stay at 0x00.

Is it a normal behavior? Why charge termination current can't be set to 20mA at cool temperature?

Thanks.