UB264AG-AB-P08-R datasheet(7/11 Pages) UTC

7 / 11 page

UB264A

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

7 of 11

www.unisonic.com.tw

QW-R502-832.b



OPERATING(Cont.)

4. Test Mode

In the UTC UB264A Series, the overcharge detection delay time (tCU) can be shortened by entering the test mode.

The test mode can be set by retaining the VDD pin voltage 8.5 V or more higher than the SENSE pin voltage for at

least 80ms (V1=V2=V3=V4=3.5V, Ta=25°C). The status is retained by the internal latch and the test mode is

retained even if the VDD pin voltage is decreased to the same voltage as that of the SENSE pin. When CO becomes

“H” when the delay time has elapsed after overcharge detection, the latch for retaining the test mode is reset and the

UTC UB264A Series exits from the test mode.

tCU/64

CO Pin

Test mode

Battery voltage

(n=1 to 4)

VCUn

VHCn

Pin voltage

>8.5V

tTST

tCL

SENSE pin voltage

VDD pin voltage

Notes:

When the VDD pin voltage is decreased to lower than the UVLO voltage of 2 V (Typ.), the UTC

UB264A Series returns to the normal mode.

Set the test mode when no batteries are overcharged.

The overcharge release delay time (tCL) is not shortened in the test mode.

The overcharge timer reset delay time (tTR) is not shortened in the test mode.

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