S8225B datasheet(11/24 Pages) SII

11 / 24 page

BATTERY MONITORING IC FOR 3-SERIAL TO 5-SERIAL CELL PACK

Rev.1.4_00

S-8225B Series

Seiko Instruments Inc.



Operation

Remark

Refer to " Connection Examples of Battery Monitoring IC".

1. Normal status

When all battery voltages are in the range from overcharge detection voltage (VCUn) to overdischarge detection

voltage (VDLn), and the CTLC pin input voltage (VCTLC) and the CTLD pin input voltage (VCTLD) are higher than the

CTLC pin voltage "H" (VCTLCH) and the CTLD pin voltage "H" (VCTLDH), respectively, the S-8225B Series defines the

CO pin output voltage (VCO) and the DO pin output voltage (VDO) as "L" (output logic active "H") or "H" (output logic

active "L"). This is called normal status.

VCO is defined as the CO pin voltage "H" (VCOH) when it is "H". Similarly, VDO is defined as the DO pin voltage "H"

(VDOH) when it is "H".

2. Overcharge status

When any one of the battery voltages becomes VCUn or higher, the CO pin output inverts and the S-8225B Series

becomes detection status. This is called overcharge status.

When all battery voltages become overcharge release voltage (VCLn) or lower, the overcharge status is released and

the S-8225B Series returns to normal status.

3. Overdischarge status

When any one of the battery voltages becomes VDLn or lower, the DO pin output inverts and the S-8225B Series

becomes detection status. This is called overdischarge status.

When all battery voltages become overdischarge release voltage (VDUn) or higher, the overdischarge status is

released and the S-8225B Series returns to normal status.

4. CTLC pin and CTLD pin

The S-8225B Series has two pins to control.

The CTLC pin controls the output voltage from the CO pin; the CTLD pin controls the output voltage from the DO pin.

Thus it is possible for users to control the output voltages from the CO pin and DO pin, respectively. These controls

precede the battery protection circuit.

Table 6 Status Set by CTLC Pin

CTLC Pin

CO Pin

"H"

Normal status

"L"

Detection status

*1.

"H": CTLC

≥ VCTLCH

*2.

"L": CTLC

≤ VCTLCL

*3.

The status is controlled by the voltage detection circuit.

Table 7 Status Set by CTLD Pin

CTLD Pin

DO Pin

"H"

Normal status

"L"

Detection status

*1.

"H": CTLD

≥ VCTLDH

*2.

"L": CTLD

≤ VCTLDL

*3.

The status is controlled by the voltage detection circuit.

S8225B Datasheet(PDF) 11 Page - Seiko Instruments Inc

S8225B Datasheet(HTML) 11 Page - Seiko Instruments Inc

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