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BQ24617: Charge Indicator ON (STAT1 low), Battery removed and /ACDRV is off (high)

Other Parts Discussed in Thread: BQ24617

My board is a Custom design.

The device seems to be in sleep mode, no activity on PH (0 Volts).

/BATDRV is low, but no battery is attached, Vfb = 0

Vcc is 13V6, one Diode drop lower than Input Voltage.

TS = 1V55 , Vref = 3V3

Iset1 = Iset2 = 0V96 (connected together), ACSET = 0V6 or 0V09 (altered with FET, depending on Input source).

REGN  behaves strangely: when connecting a voltmeter, the voltage decayes down to 150mV  (from approx 4V initially)

Resoldering another BQ24617,  REGN is stable at 6V, but the symptom remains the same: Charge Indicator is on, /ACDRV is off (13V2).

 

I'm out of ideas where to look.

Thanks much for a good hint.