S-8241 Seiko Instruments, S-8241 Datasheet - Page 10

• Manufacturer Part Number: S-8241
• Description: Battery Protection IC for 1-Cell Pack
• Manufacturer: Seiko Instruments

10
BATTERY PROTECTION IC FOR 1-CELL PACK
S-8241 Series
Unless otherwise specified, the output voltage levels "H" and "L" at CO and DO pins are judged by the
threshold voltage (1.0 V) of a Nch FET. Judge the CO pin level with respect to V
respect to V
(1) Measurement Condition 1, Measurement Circuit 1
〈〈 Overcharge detection voltage, Overcharge release voltage, Overdischarge detection voltage,
Overdischarge release voltage〉〉
(2) Measurement Condition 2, Measurement Circuit 1
〈〈 Overcurrent 1 detection voltage, Overcurrent 2 detection voltage, Load short-circuiting detection voltage 〉〉
(3) Measurement Condition 3, Measurement Circuit 1
〈〈 Charger detection voltage, (=abnormal charge current detection voltage) 〉〉
Measurement Circuits
The overcharge detection voltage (V
″L″ from ″H″ when the voltage V1 is gradually increased from the normal condition V1=3.5 V and
V2=0 V. The overcharge release voltage (V
V
Gradually decreasing the voltage V1, the overdischarge detection voltage (V
between VDD and VSS at which V
defined by the voltage between VDD and VSS at which V
gradually increased.
The overcurrent 1 detection voltage (V
goes ″L″ from ″H″ when the voltage V2 is gradually increased from the normal condition V1=3.5 V and
V2=0 V.
The overcurrent 2 detection voltage (V
goes ″L″ from ″H″ when the voltage V2 is increased at the speed between 1 ms and 4 ms from the normal
condition V1=3.5 V and V2=0 V.
The load short-circuiting detection voltage (V
which V
the normal condition V1=3.5 V and V2=0 V.
• Applied only for products with overdischarge hysteresis
• Applied only for products without overdischarge hysteresis
CO
Set V1=1.8 V and V2=0 V under overdischarge condition. Increase V1 gradually, set V1=(V
(within overdischarge hysteresis, overdischarge condition), then decrease V2 from 0 V gradually. The
voltage between VM and VSS at which V
Set V1=3.5 V and V2=0 V under normal condition. Decrease V2 from 0 V gradually. The voltage
between VM and VSS at which V
The abnormal charge current detection voltage has the same value as the charger detection voltage
(V
goes ″H″ from ″L″ when the voltage V1 is then gradually decreased.
CHA
DO
).
SS
goes ″L″ from ″H″ when the voltage V2 is increased at the speed between 1 µs and 50 µs from
. Voltages V1 to V4 are shown in the figure 4.
DO
CO
CU
goes ″L″ from ″H″. The overdischarge release voltage (V
) is defined by the voltage between VDD and VSS at which V
goes ″L″ from ″H″ is the abnormal charge current detection voltage.
Seiko Instruments Inc.
IOV1
IOV2
) is defined by the voltage between VDD and VSS at which V
) is defined by the voltage between VDD and VSS at which V
CL
DO
SHORT
) is defined by the voltage between VDD and VSS at which
goes ″H″ from ″L″ is the charger detection voltage (V
) is defined by the voltage between VDD and VSS at
DO
goes ″H″ from ″L″ when the voltage V1 is then
DL
VM
) is defined by the voltage
and the DO pin level with
Rev.4.1
DU
DU
+V
) is
CO
DL
CHA
goes
)/2
_01
).
DO
DO