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BQ34Z100-G1: Vok not set and statetime reset

Part Number: BQ34Z100-G1

Hi dear TI team

There are 2 questions need you help:

1. On learning cycle test in some cases,VOK flag will not set 1 (randomly occur) which will cause BQ34 not calculate SOH and the learning cycle test fail, I have compared the Vok can normally set test data, do not find any significant differences on other parameters of BQ34(eg: FC,OCVTAKEN... can set 1 normally), so what the necessary conditions for Vok set? 

2. Also on learning cycle test "fgStateTime" abnormal reset (dis/charge state not change and system not receive reset signal) which cause the chip not calculate SOH and the learning cycle test fail, this is also randomly occur, is there any other conditions which make it reset except: last state change (DISCHARGE, CHARGE, REST)?

Thanks,

Riffin