BQ24257 Datasheet, PDF (23/45 Pages) Texas Instruments – 2A Single Input I2C, Standalone Switch-Mode Li-Ion Battery Charger with Integrated Current Sense Resistor

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Enter Battery
Detection
bq24257
bq24258
SLUSBG0B – FEBRUARY 2013 – REVISED JULY 2013
BATREG = Vreg
setting – 480mV
VBAT >
Yes
BATREG+120mV?
No
No
25ms Timer Expired?
Yes
BATREG = 4.2V
VBAT < 4.08V?
Yes
No
No
25ms Timer Expired?
Yes
ONLY ON FIRST LOOP ITERATION
“No Battery” Condition
BATREG = 4.2V
Update STAT Registers and send Fault Pulse
No
32ms Timer Expired?
Yes
Battery Detected, STAT
register updated, and PTM
mode aborted (if enabled)
No
32ms Timer Expired?
Yes
Battery Detected, STAT
register updated and
Exit Battery Detection
EN_PTM=1 and
Yes
NVM_EN_PTM=1?
No
BATREG = 3.72V
VBAT > 3.84V?
Yes
No
Enter PTM mode
Exit Battery Detection
No
32ms Timer Expired?
Yes
Battery Detected, STAT
register updated and
Exit Battery Detection
No
25ms Timer Expired?
Yes
Figure 19. AnyBoot Battery Detection Flow Diagram
Copyright © 2013, Texas Instruments Incorporated
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