UB264BG-AF-P08-R datasheet(6/11 Pages) UTC

6 / 11 page

UB264B

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

6 of 11

www.unisonic.com.tw

QW-R502-833.b



OPERATING

1. Overcharge Detection

Under normal conditions, when the voltage of any one cell battery exceeds the overcharge detection voltage (VCU)

during charging, and after the state is retained for the overcharge detection delay time (tCU), CO will become “H”.

This state is called overcharge. Attaching FET to the CO pin provides charge control and a second protection.

Only the voltage of all the batteries decreases below the total of the overcharge detection voltage (VCU) and the

overcharge hysteresis voltage (VHC) and the state is retained for the overcharge release delay time (tCL) or longer,

the overcharge status is released; however, CO stays at “H”. When the CTL pin is switched from “L” to “H”, CO

becomes “L”.

2. Overcharge Timer Reset

When an overcharge release noise that forces the voltage of the battery temporarily below the overcharge

detection voltage (VCU) is input during the overcharge detection delay time (tCU) from when VCU is exceeded to when

charging is stopped, tCU is continuously counted if the time the overcharge release noise persists is shorter than the

overcharge timer reset delay time (tTR). Under the same conditions, if the time the overcharge release noise persists

is tTR or longer, counting of tCU is reset once. After that, when VCU has been exceeded, counting tCU resumes.

3. CTL Pin

The CTL pin is used to control the output voltage of the CO pin. In the UTC UB264B Series, when the CTL pin is

switched from “L” to “H”, a reset signal is output to the overcharge detection latch and CO becomes “L”.

CTL PIN

CO PIN

“H”

Without latch

Open

Normal state (Note 1)

“L”

Normal state (Note 1)

“L”→ “H”

Latch reset (Note 2)

“H” →“L”

Notes:

The state is controlled by the overcharge detection circuit.

Latch reset becomes effective when the voltages of all the

batteries are lower than the total of the overcharge detection

voltage (VCU) and the overcharge hysteresis voltage (VHC) and the

overcharge release delay time (tCL) has elapsed.

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