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DEVICE_XREADY always 1

Other Parts Discussed in Thread: BQ76940

i don't know why my bq76940 DEVICE_XREADY flag always 1 

IC is bq76940 connected with 13s, both DSG and CHG pin not connected.

SYS_STAT now : 

CC_READY = 0
RSVD = 0
DEVICE_XREADY = 1
OVRD_ALERT =0
UV = 0
OV = 0
SCD = 0
OCD = 0 

DEVICE_XREADY flag clear every second, but still returned to 1 

cheers,

Tiger