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| BQ24630 Datasheet, PDF (22/33 Pages) Texas Instruments – Stand-Alone Synchronous Switch-Mode Lithium Phosphate Battery Charger with System Power Selector and Low Iq | |||
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bq24630
SLUS894 â JANUARY 2010
Table 3. STAT Pin Definition for bq24630
CHARGE STATE
Charge in progress
Charge complete
Charge suspend, timer fault, over-voltage, sleep mode, battery absent
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STAT1
ON
OFF
OFF
STAT2
OFF
ON
OFF
BATTERY DETECTION
For applications with removable battery packs, bq24630 provides a battery absent detection scheme to reliably
detect insertion or removal of battery packs.
POR or RECHARGE
Apply 8 mA discharge
current, start 1s timer
The battery detection routine runs on
power up , or if VFB falls below VRECH
due to removing a battery or
discharging a battery
VFB < VLOWV
No
1s timer
No
expired
Yes
Disable 8 mA
discharge current
Yes
Battery Present,
Begin Charge
Enable 125 mA Charge,
Start 0.5s timer
VFB > VRECH
Yes
Disable 125 mA
Charge
No
0.5s timer
No
expired
Yes
Battery Present,
Begin Charge
Battery Absent
Figure 21. Battery Detection Flowchart
22
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Product Folder Link(s): bq24630
Copyright © 2010, Texas Instruments Incorporated
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