Datasheet

Start Safety Timer
Charge Done?
I
CHG
< I
TERM
No
STAT = Hi
Update STAT
bits
I2C Read/Write
performed?
Start 30 second
watchdog timer
No
Yes
30s timer expired?
No
Yes
Received SW watchdog
RESET?
No
Yes
Safety timer expired?
No
Yes
Safety timer
fault
Charging suspended
Enter suspended
mode
Fault indicated in
STAT registers
Yes
Charge Done?
I
CHG
< I
TERM
No
STAT = Hi
Update STAT
bits
Yes
Reset 30 second
watchdog timer
Reset to default
values in I2C
register
Restart 27min
safety timer
Safety timer expired?
Safety timer
fault
Charging suspended
Fault indicated in
STAT registers
No
Yes
bq24270
bq24271
www.ti.com SLUSB10 –JUNE 2012
Figure 5. The Watchdog Timer Flow Chart for bq24270 and bq24271
Copyright © 2012, Texas Instruments Incorporated Submit Documentation Feedback 17
Product Folder Link(s): bq24270 bq24271