BQ24180 Datasheet, PDF (18/39 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
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HOST Mode Battery
Charging
Start 32 second
watchdog timer
Yes
Safety Timer expired?
Safety timer
fault
No
Charging suspended
Enter suspended
mode
Fault indicated in
STAT registers
No
Term Enabled ?
Yes
Charge Done? ^Yes
ICHG < ITERM
No
No
32s timer expired?
Yes
Indicate Timer Fault
Reset I2C to default
CV Mode?
No
STAT = Hi
Yes
Yes Update STAT
Battery Present?
bits
Terminate
Safety Timer
No
Indicate
Battery Not
Present Fault
Reset I2C to
default
VBAT<VRCH?
Yes
DEFAULT Mode ?
Yes
No _{Begin HOST}
Mode Battery
Charging
Begin
DEFAULT
Mode Battery
Charge Cycle
No
Received SW watchdog ^Yes
RESET?
Reset 32 second
watchdog timer
Begin DEFAULT
Mode Battery
Charge Cycle
Figure 28. Host Mode Charging Process
DEFAULT Mode
DEFAULT mode is used when I²C communication is not available. DEFAULT mode is entered in the following
situations:
1. When the charger is enabled and V_BAT>3.6V before I²C communication is established
2. When the watchdog timer expires without a reset from the I²C interface and the safety timer has not expired.
3. When the device comes out of any fault condition (sleep mode, OVP, faulty adapter mode, etc.) before I²C
communication is established
In default mode, the I²C registers are reset to the default values. The 27 min safety timer is reset and starts when
DEFAULT mode is entered. The default value for V_OREG is 3.6V, and the default value for I_CHARGE is 1A. The
input current limit is determined by the PSEL input. If PSEL selects adapter mode, there is no input current limit.
If PSEL selects PC mode, the input current limit is set to 100mA. Default mode is exited by programming the I²C
interface. Startup into DEFAULT mode is shown in Figure 29. Note that if termination is enabled and charging
has terminated, a new charge cycle is NOT initiated when entering DEFAULT mode.
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