BQ24040_16 Datasheet, PDF (20/38 Pages) Texas Instruments – Single Cell Li-Ion and Li-Pol Battery Charger With Auto Start

bq24040, bq24041, bq24045
SLUS941F – SEPTEMBER 2009 – REVISED MARCH 2015
Start
BATT _DETECT
Start 25ms timer
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 14. Battery Detect Routine (bq24040)
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20
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