Identify Chip on 2S BMS / Balance Card – Guide

battery-balancebmslithium ion

I picked up a bunch of Chinese-made 2S BMS / Balance boards. As is the norm with inexpensive Chinese boards, they came with essentially NO documentation aside from how to hook the board to the batteries and load.

I've identified all of the devices on the board except for the chip that controls the BMS function. This is a SOT23-6 with the letters "PAYG" on top.

I'm hoping that someone can identify this chip and point me towards a datasheet for same.

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Full Board

Best Answer

PAY is Seiko S-8242AAY-M6T2GZ battery protection IC. The last letter G is related to lot number.

Here is PDF (see table on page 23 for part code): http://img.hqew.com/file/Others/1090000-1099999/1098111/Electronic/201251816354378771.pdf

And there is the list of codes, which contains PAY: http://www.dl7avf.info/charts/smdcode/cpa.html#TOC

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