BATTERY PROTECTION IC FOR 3-SERIAL- OR 4-SERIAL-CELL PACK
Rev.5.0_01
S-8254A Series
Seiko Instruments Inc.
9
Test Circuits
This chapter describes how to test the S-8254A Series when a 4-serial cell is selected by setting the SEL pin
to the VDD level. When a 3-serial cell is selected by setting the SEL pin to the VSS level, short the power
supply V4.
1. Current Consumption on Operation, Current Consumption at Power-down
(Test circuit 1)
1.1 Current Consumption on Operation (I
OPE
)
The current at the VSS pin when V1 = V2 = V3 = V4 = 3.5 V and V
VMP
= V
DD
is the current
consumption (I
OPE
) during operation.
1.2 Current Consumption at Power-down (I
PDN
)
The current at the VSS pin when V1 = V2 = V3 = V4 = 1.5 V and V
VMP
= V
SS
is the current consumption
(I
PDN
) at power down.
2. Overcharge Detection Voltage, Overcharge Release Voltage, Overdischarge Detection Voltage,
Overdischarge Release Voltage, Overcurrent Detection Voltage 1, Overcurrent Detection Voltage
2, Overcurrent Detection Voltage 3, CTL Input Voltage “H”, CTL Input Voltage “L”, SEL Input
Voltage “H”, SEL Input Voltage “L”
(Test circuit 2)
Confirm that the COP pin and DOP pin are low (V
DD
× 0.1 V or lower) when V
VMP
= V
SEL
= V
DD
, V
INI
= V
CTL
= V
SS
, the CCT pin is open, the CDT pin is open, and V1 = V2 = V3 = V4 = 3.5 V (this status is referred to
as the initial status).
2.1 Overcharge Detection Voltage (V
CU1
), Overcharge Release Voltage (V
CL1
)
The overcharge detection voltage (V
CU1
) is the voltage of V1 when the voltage of the COP pin is “H”
(V
DD
× 0.9 V or more) after the V1 voltage has been gradually increased starting at the initial status.
The overcharge release voltage (V
CL1
) is the voltage of V1 when the voltage at the COP pin is “L” after
the V1 voltage has been gradually decreased.
2.2 Overdischarge Detection Voltage (V
DL1
), Overdischarge Release Voltage (V
DU1
)
The overdischarge detection voltage (V
DL1
) is the voltage of V1 when the voltage of the DOP pin is “H”
after the V1 voltage has been gradually decreased starting at the initial status. The overdischarge
release voltage (V
DU1
) is the voltage of V1 when the voltage at the DOP pin is “L” after the V1 voltage
has been gradually increased.
When the voltage of Vn (n = 2 to 4) is changed, the overcharge detection voltage (V
CUn
), overcharge
release voltage (V
CLn
), overdischarge detection voltage (V
DLn
), and overdischarge release voltage
(V
DUn
) can be determined in the same way as when n = 1.
2.3 Overcurrent Detection Voltage 1 (V
IOV1
)
Overcurrent detection voltage 1 (V
IOV1
) is the voltage of the VINI pin when the voltage of the DOP pin
is “H” after the VINI pin voltage has been gradually increased starting at the initial status.
2.4 Overcurrent Detection Voltage 2 (V
IOV2
)
Overcurrent detection voltage 2 (V
IOV2
) is the voltage of the VINI pin when the voltage of the DOP pin
is “H” after the voltage of the CDT pin was set to V
SS
following the initial status and the voltage of the
VINI pin has been gradually decreased.
2.5 Overcurrent Detection Voltage 3 (V
IOV3
)
Overcurrent detection voltage 3 (V
IOV3
) is the voltage difference between V
VC1
and V
VMP
(V
VC1
− V
VMP
)
when the voltage of the DOP pin is “H” after the VMP voltage has been gradually decreased starting at
the initial status.
