BQ26501_16 Datasheet, PDF (9/33 Pages) Texas Instruments – HANDHELD APPLICATIONS

Not Recommended For New Designs
bq26501
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SLUS586B − OCTOBER 2003 − REVISED MARCH 2004
APPLICATION INFORMATION
VDQ is cleared and a capacity learning cycle is disqualified by any of the following conditions:
1. Cold temperature: Temperature less than or equal to the TOFF value programmed in the TCOMP register
when the EDV1 threshold voltage is reached.
2. Light load: Average current is less than or equal to 2 times the initial standby load (ISLC) when the EDV1
threshold voltage is reached.
3. Fast voltage drop: VOLT ≤ (EDV1 − 256 mV) when EDV1 is set.
4. Excessive charging: Cumulative charge added is greater than 255 mAh during a learning discharge cycle
(alternating discharge-charge-discharge before EDV1 is set).
5. Reset: VDQ is cleared on reset.
6. Excessive self-discharge: NAC reduction from self−discharge estimate exceeds 12.48%.
7. Self-discharge at termination of learning cycle. If self-discharge estimate reduces NAC until NAC ≤ LMD/16.
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