BATTERY PROTECTION IC WITH ALARM FUNCTION FOR 1-CELL PACK

S-82T1A Series

Rev.1.0_00

26



Battery Protection IC Connection Example

DO

CO

VM

FET1

FET2

R2

VSS

VINI

R3

R4

Battery C1

AO

Alarm signal

output

R1

VDD

EB

−

EB

+

Figure 15

Figure 13 Constants for External Components

Symbol

Part

Purpose

Min.

Typ.

Max.

Remark

FET1

N-channel

MOS FET

Discharge control

−

−

−

Threshold voltage

≤ Overdischarge

detection voltage*1

FET2

N-channel

MOS FET

Charge control

−

−

−

Threshold voltage

≤ Overdischarge

detection voltage*1

R1

Resistor

ESD protection,

For power fluctuation

270

Ω

330

Ω

1 k

Ω*2

−

C1

Capacitor

For power fluctuation

0.068

μF 0.1 μF

1

μF

−

R2

Resistor

ESD protection,

Protection for reverse

connection of a charger

270

Ω

470

Ω

1.5 k

Ω

−

R3

Resistor

Overcurrent detection

−

1.5 m

Ω

−

−

R4

Resistor

ESD protection

−

1 k

Ω

−

−

*1. If a FET with a threshold voltage equal to or higher than the overdischarge detection voltage is used, discharging may be

stopped before overdischarge is detected.

*2. Accuracy of overcharge detection voltage is guaranteed by R1 = 330

Ω. Connecting resistors with other values will worsen

the accuracy.

Caution 1. The constants may be changed without notice.

2. It has not been confirmed whether the operation is normal or not in circuits other than the connection

example. In addition, the connection example and the constants do not guarantee proper operation.

Perform thorough evaluation using the actual application to set the constants.