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S-8244ABKFM-CFKT2U

BATTERY PROTECTION IC FOR 1-SERIAL TO 4-SERIAL-CELL PACK (SECONDARY PROTECTION)

Seiko Instruments Inc 

BATTERY PROTECTION IC FOR 1-SERIAL TO 4-SERIAL-CELL PACK (SECONDARY PROTECTION)

Rev.6.4_02

S-8244 Series

(4) Test Condition 4, Test Circuit 1

Set switches 1 and 2 to OFF for CMOS output product.

Set switch 1 to ON and switch 2 to OFF for Nch open drain product.

Set switch 1 to OFF and switch 2 to ON for Pch open drain product.

• Product with CMOS output active “H”, Nch open drain output active “H”

The overcharge detection voltage 4 (VCU4) is a voltage at V4; when the CO pin’s voltage is set to “H” by increasing

V4 gradually, after setting V1 = V2 = V3 = V4 = 3.5 V. After that, gradually decreasing V4’s voltage to set CO = “L”,

and the difference of this V4’s voltage and VCU4 is the overcharge hysteresis voltage 4 (VCD4).

• Product with CMOS output active “L”, Nch open drain output active “L”, Pch open drain output active “L”

The overcharge detection voltage 4 (VCU4) is a voltage at V4; when the CO pin’s voltage is set to “L” by increasing

V4 gradually, after setting V1 = V2 = V3 = V4 = 3.5 V. After that, gradually decreasing V4’s voltage to set CO =

“H”, and the difference of this V4’s voltage and VCU4 is the overcharge hysteresis voltage 4 (VCD4).

(5) Test Condition 5, Test Circuit 2

Set switches 1 and 2 to OFF for CMOS output product.

Set switch 1 to ON and switch 2 to OFF for Nch open drain product.

Set switch 1 to OFF and switch 2 to ON for Pch open drain product.

• Product with CMOS output active “H”, Nch open drain output active “H”

Rise V1 to 4.7 V momentarily within 10 μs after setting V1 = V2 = V3 = V4 = 3.5 V. The period from V1 having

reached 4.7 V to CO = “H” is the overcharge detection delay time (tCU).

• Product with CMOS output active “L”, Nch open drain output active “L”, Pch open drain output active “L”

Rise V1 to 4.7 V momentarily within 10 μs after setting V1 = V2 = V3 = V4 = 3.5 V. The period from V1 having

reached 4.7 V to CO = “L” is the overcharge detection delay time (tCU).

(6) Test Condition 6, Test Circuit 3

Measure current consumption (I1) setting V1 = V2 = V3 = V4 = 2.3 V. This I1 is current consumption at power-down

(IPDN).

Measure current consumption (I1) setting V1 = V2 = V3 = V4 = 3.5 V. This I1 is current consumption during normal

operation (IOPE), I2 is the VC1 sink current (IVC1), I3 is the VC2 sink current (IVC2), I4 is the VC3 sink current (IVC3).

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