BQ24090_2 Datasheet, PDF (23/32 Pages) Texas Instruments – 1A, Single-Input, Single Cell Li-Ion Battery Charger

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Start
BATT _DETECT
Start 25ms timer
bq24090, bq24091
bq24092, bq24093
SLUS968B – JANUARY 2010 – REVISED JUNE 2010
No
Timer Expired?
Yes
Yes
Is VOUT<VREG-100mV?
Battery Present
Turn off Sink Current
Return to flow
No
Set OUT REG
to VREG-400mV
Enable sink current
Reset & Start 25ms timer
No
Timer Expired?
Yes
Yes
Battery Present
Is VOUT>VREG-300mV?
Turn off Sink Current
Return to flow
No
Battery Absent
Don’t Signal Charge
Turn off Sink Current
Return to Flow
Figure 24. Battery Detect Routine
Copyright © 2010, Texas Instruments Incorporated
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Product Folder Link(s): bq24090 bq24091 bq24092 bq24093