US209BL-AC-S08-R datasheet(9/10 Pages) UTC

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UB209B

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

9 of 10

www.unisonic.com.tw

QW-R502-943.c



OPERATION (Cont.)

1. Normal Status

In the UTC UB209B, both of CO and DO pin get the VDD level; the voltage between VDD and VSS (VDS) is more

than the overdischarge detection voltage (VDL), and is less than the overcharge detection voltage (VCU) and

respectively, the CTLC pin input voltage (VCTLC) > the CTLC pin voltage “L” (VCTLCL), the CTLD pin input voltage

(VCTLD) > the CTLD pin voltage “L” (VCTLDL). This is the normal status.

2. Overcharge Status

In the UTC UB209B, the CO pin is in high impedance; when VDS gets VCU or more, or VCTLC gets VCTLCL or less.

This is the overcharge status.

If VDS gets the overcharge release voltage (VCL) or less, and VCTLC gets the CTLC pin voltage “H” (VCTLCH) or more,

the UTC UB209B releases the overcharge status to return to the normal status.

3. Overdischarge Status

In the UTC UB209B, the DO pin is in high impedance; when VDS gets VDL or less, or VCTLD gets VCTLDL or less.

This is the overdischarge status.

If VDS gets the overdischarge release voltage (VDU) or more, and VCTLD gets the CTLD pin voltage “H” (VCTLDH) or

more, the UTC UB209B releases the overdischarge status to return to the normal status.

4. Cell-balance Function

In the UTC UB209B, the CB pin gets the level of VDD pin; when VDS gets the cell-balance detection voltage (VBU)

or more. This is the charge cell-balance function.

If VDS gets the cell-balance release voltage (VBL) or less again, the UTC UB209B sets the CB pin the level of VSS

pin.

In addition, the CB pin gets the level of VDD pin; when VDS is more than VDL, and VCTLD is VCTLDL or less. This is the

discharge cell-balance function.

If VCTLD gets VCTLDH or more, or VDS is VDL or less again, the UTC UB209B sets the CB pin the level of VSS.

5. Delay Circuit

In the UTC UB209B, users are able to set delay time which is from detection of changes in VDS, VCTLC, VCTLD to

output to the CO, DO, CB pin.

For example in the detection of overcharge status, when VDS exceeds VCU, or VCTLC gets VCTLCH or less, charging

to CCDT starts via RCDT. If the voltage between CDT and VSS (VCDT) reaches the CDT pin detection voltage (VCDET),

the CO pin is in high impedance. The output pin delay time tD is calculated by the following formula.

tD [s]=10.0MΩ (Typ.)×CCDT [µF]

The electric charge in CCDT starts to be discharged when the delay time has finished.

The delay time that users have set for the CO pin, as seen above, is settable for each output pin DO, CB.

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