UB264AL-AC-P08-R datasheet(6/11 Pages) UTC

6 / 11 page

UB264A

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

6 of 11

www.unisonic.com.tw

QW-R502-832.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 voltages 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,

CO will become “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 UB264A Series, the CTL pin takes

precedence over the overcharge detection circuit.

CTL PIN

CO PIN

“H”

Normal state (Note 1)

Open

“H”

“L”

“H”

“L”→ “H”

“H” →“L”

Note:

1. The state is controlled by the overcharge detection circuit.

Notes:

The reverse voltage “H” to “L” or “L” to “H” of CTL pin is VDD pin voltage −2.8V (Typ.), does not have

the hysteresis.

Since the CTL pin implements high resistance of 8MΩ to 12MΩ for pull down, be careful of external

noise application. If an external noise is applied, CO may become “H”. Perform thorough evaluation

using the actual application.

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