BQ24140_14 Datasheet, PDF (19/39 Pages) Texas Instruments – Integrated Dual-Input Switch-Mode One-Cell Li-Ion Charger with Full USB Compliance and USB-OTG Support

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IC unpowered
Attach VIN
and/or V_BUS
DEFAULT mode
bq24140
SLUSAO5 – OCTOBER 2011
CD Pin Low?
No
Yes
Good input ^No
power?
Hi-Z mode
Hi-Z mode
Yes
Battery
No
Inserted?
Hi-Z mode
DEFAULT mode
Charge at
ICHRG=325mA up
to VBAT=3.54V
Yes
Yes
Battery need
charge?
No
Charge Disable
Attach
battery
I2C
communication
?
No
No
15-min timer
expired?
Yes
HOST mode
controlled
charging at I_CHRG
up to VOREG
Watchdog
timer expired?
Hi-Z mode
Yes
No
Input Power
POR?
No
VBAT>VRCHG ,Term
Enabled and I_TERM
reached?
Yes
Hi-Z mode
Figure 18. Operational Flowchart
POWER UP
When a power source is first connected to the bq24140, the IC will go to default mode for 15 minutes. In default
mode, the bq24140 is configured with safe charging parameters for charge current, charge voltage and input
current. Once a write event is done to the bq24140 through I²C, the device enters host mode and the device will
then follow the parameters as they are written by the host.
Copyright © 2011, Texas Instruments Incorporated
Product Folder Link(s): bq24140
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