MP2722 BATT_LOW Interrupt

DC-DC Power Converters
1

Good day,

I’m using the MP2722 and one of the interrupts I can’t get to work is the BATT_LOW. Other interrupts do work.
The interrupt is enabled in Reg10h bit 1, MASK_BATT_LOW is 0.
BATT_LOW is set to 3.2V in Reg0Ch, bits 3 & 2, and BOOST_STP_EN is 0, bit 1, to force an interrupt.
BATT_LOW_STAT in Reg16h bit 4 never goes high to indicate the BATT_LOW state even when the battery voltage is below 3V.

Is there something I’m missing?

Regards,
Charles

2

Hi Charles,

Is charging suspended?

If you set BOOST_STP_EN bit to 1 and VBATT falls below the BATT_LOW setting, does boost operation turn off and the part latches?

Also please check if BOOST_FAULT reads 100.

Best Regards,
Yu

3

Hi Yu,
Thanks for the info. I found the issue, I wasn’t reading all the registers and hence when I tested the BATT_LOW bit value it was always 0. After correcting the read block size the device works as expected.

Best regards,
Charles