Inquiry MMPF3000 Coin Cell charger control

[andychien]

Dear Sir,

Our customer used i.MX6UL+ PF3000 and add coin cell to design product.

We knew if system off (PMIC Vin off), coin cell provide power to VSNVS of i.MX6UL then work RTC function only.

If PMIC Vin provide power and system work, we will setting COINCTL register (COINCHEN bit) to enable charger coin cell.

We are not sure how to control disable or know coin cell is full to stop charger.

Could you help provide control method, software or circuit to reference?

Thanks a lot, 

[igorpadykov]

Hi Andy

coin cell charger voltage is programmable as described in

sect.6.3.11.4 Coin cell charger control datasheet. It works as

current-limited voltage source, resulting in the CC/CV taper characteristic

typically used for rechargeable Lithium-Ion batteries. So no need

 to stop charger current as it stops automatically as cell voltage reaches

programmable level.

Best regards
igor
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[andychien]

Thanks Sir,

I will tell customer to confirm coin cell Vendor.

If any question, we will tell you.

Thanks for fast help