BQ24180 Datasheet, PDF (20/39 Pages) Texas Instruments – Fully Integrated Switch-Mode One-Cell Li-Ion Charger with Full USB Compliance and Accessory Power Connection

bq24180
SLUSA02 A – FEBRUARY 2010 – REVISED FEBRUARY 2010
Start Safety Timer
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Yes
Safety timer expired?
No
Charge Done?
ICHG < ITERM
No
Yes ^{STAT = Hi}
Update STAT
bits
No
I2C Read/Write
performed?
Yes
Start 12 second
watchdog timer
Safety timer
fault
Charging suspended
Enter suspended
mode
Fault indicated in
STAT registers
Charge Done?
ICHG < ITERM
Yes ^{STAT = Hi}
Update STAT
bits
Reset 12 second
watchdog timer
No
Safety timer expired?
No
Yes
Safety timer
fault
12s timer expired?
Yes
Charging suspended
Enter suspended
mode
Fault indicated in
STAT registers
No
Yes
No
Received SW watchdog
RESET?
Reset to default
values in I2C
register
Restart 27min
safety timer
Figure 30. The Watchdog Timer Flow Chart for bq24180
Power Source Selector Input (PSEL)
The bq24180 contains a PSEL input that is used to program the input current limit during DEFAULT mode. Drive
PSEL high to indicate a USB source is connected to the input and the PC mode default values should be used.
When PSEL is high, the IC starts up with a 100mA input current limit and a 1A charge current. Drive PSEL low to
indicate that an AC Adapter is connected to the input. When PSEL is high, the IC starts up with no input current
limit and a 1A charge current. PSEL is internally pulled up to the DRV supply with a 100kΩ resistor.
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