bq26501

SLUS586B − OCTOBER 2003 − REVISED MARCH 2004

9

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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.

Not Recommended For New Designs