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BATTERY PROTECTION IC FOR 3-SERIAL OR 4-SERIAL CELL PACK

Rev.3.0_00

S-8243A/B Series

Seiko Instruments Inc.

 Test Circuits

In this chapter test methods are explained for the case of S-8243B series, which is designed for 4-serial cell pack. For the

case of S-8243A series, which is designed for 3-serial cell, voltage source V2 should be shorted, V3 should be read as V2,

and V4 as V3.

1. Current consumption (Test circuit 1)

Current consumption at not monitoring V

BATOUT

, I

OPE

, is a current measured at the VSS pin when V1 = V2 = V3 = V4 =

3.5 V and V

= V

. Current consumption at power down, I

PDN

, is a current measured at the VSS pin when V1 = V2 =

V3 = V4 = 1.5 V and V

= V

2. Voltage regulator (Test circuit 2)

Output voltage of the regulator V

OUT

is a voltage measured at the VREG pin when V

= V

= 14 V and I

OUT

= 3 mA.

Line regulation of the voltage regulator ΔV

OUT1

is defined by the equation ΔV

OUT1

= V

OUT2

−V

OUT1

where V

OUT1

is the

output voltage when V

= V

= 6 V and I

OUT

= 3 mA, and V

OUT2

is the output voltage when V

= V

= 18 V and I

OUT

= 3 mA.

Load regulation of the regulator is defined by the equation ΔV

OUT2

= V

OUT3

−V

OUT

where V

OUT3

is the output voltage when

= V

= 14 V and I

OUT

= 5 μA.

3. Battery monitor amp and pin current for VC1 to VC3 (Test circuit 3)

Voltage gain of the battery monitor amp for each cell is defined by the input offset voltage and the measurement result

provided from the VBATOUT pin for the combination of the CTL3 pin and CTL4 pin expressed by the following table at

the condition where V1 = V2 = V3 = V4 = 3.5 V. Pin current for VC1 to VC3, I

VCn

and I

VCnN

are at the same time

measured.

Table 8

CTL3 pin status CTL4 pin status VBATOUT pin output VCn (n = 1, 2, 3) pin current

CTL3H

min. V

CTL4H

min. V

OFF1

VC1

at VC1 pin

CTL3H

min. Open V

BAT1

−

CTL3H

min. V

CTL4L

max. V

OFF2

VC2

at VC2 pin

Open V

CTL4H

min. V

BAT2

−

Open Open V

OFF3

VC3

at VC3 pin

Open V

CTL4L

max. V

BAT3

−

CTL3L

max. V

CTL4H

min. V

OFF4

VCnN

at VCn pin (n = 1, 2, 3)

CTL3L

max. Open V

BAT4

−

Voltage gain of the battery monitor amp for each cell is calculated by the equation

GAMPn = (V

BATn

−V

OFFn

) / Vn (n = 1 to 4)

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 35 36

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