Rev.5.4
_00
BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK
S-8232 Series
The 8232 series is a lithium-ion / lithium-polymer
rechargeable battery protection IC incorporating high-
accuracy voltage detection circuit and delay circuit.
The S-8232 series is suitable for 2-cell serial lithium-ion
/ lithium-polymer battery packs.
Features
(1) Internal high-accuracy voltage detection circuit
•
Overcharge detection voltage
3.85 V
±
25 mV to 4.60 V
±
25 mV
Applicable in 5 mV step
•
Overcharge release voltage
3.60 V
±
50 mV to 4.60 V
±
50 mV
Applicable in 5 mV step
(The overcharge release voltage can be selected within the range where a difference from overcharge
detection voltage is 0 to 0.3 V.)
•
Overdischarge detection voltage 1.70 V
±
80 mV to 2.60 V
±
80 mV
Applicable in 50 mV step
•
Overdischarge release voltage
1.70 V
±
100 mV to 3.80 V
±
100 mV Applicable in 50 mV step
(The overdischarge release voltage can be selected within the range where a difference from
overdischarge detection voltage is 0 to 1.2 V.)
•
Overcurrent detection voltage 1 0.07 V
±
20 mV to 0.30 V
±
20 mV
Applicable in 5 mV step
(2) High input-voltage device : Absolute maximum ratings 18 V.
(3) Wide operating voltage range : 2 to 16 V
(4) The delay time for every detection can be set via an external capacitor.
(Each delay time for Overcharge detection, Overdischarge detection, Overcurrent detection are
“Proportion of hundred to ten to one”.)
(5) Two overcurrent detection levels (Protection for short-circuiting)
(6) Internal auxiliary over voltage detection circuit (Fail-safe for overcharge detection voltage)
(7) Internal charge circuit for 0 V battery (Unavailable is option)
(8) Low current consumption
•
Operation mode
7.5
µA
typ. 14.2
µA
max. (− 40 to
+
85
°C)
•
Power-down mode 0.2 nA typ. 0.1
µA
max. (− 40 to
+
85
°C)
(9) Lead-free products
Application
•
Lithium-ion rechargeable battery packs
•
Lithium- polymer rechargeable battery packs
Package
Package Name
8-Pin TSSOP
Package
FT008-A
Drawing Code
Tape
FT008-E
Reel
FT008-E
Seiko Instruments Inc.
1
BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK
S-8232 Series
Block Diagram
Rev.5.4
_00
VCC
SENS
Reference
voltage 1 Auxiliary
overcharge
detector 1
−
+
−
+
−
+
Overcharge
detector 1
Over-
discharge
detector 1
Control
logic
Delay circuit
control signal
DO
VC
Over-
discharge
detector 2
Overcharge
detector 2
Delay circuit control signal
Delay circuit
control signal
CO
RCOL
+
−
+
−
+
−
Over current
detection circuit
Delay circuit
control signal
Delay circuit
DO, CO control signal
VM
VSS
Auxiliary
overcharge
Reference
detector 2
voltage 2
ICT
Remark
Resistor (RCOL) is connected to the Nch transistor although CO pin serves as a CMOS output.
For this, impedance becomes high when outputting “L” from CO pin. Refer to the “
Electrical
Characteristics
” for the impedance value.
Figure 1
2
Seiko Instruments Inc.
BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK
S-8232 Series
Table 1 (2 / 2)
Rev.5.4
_00
Overcharge
detection
0 V battery
Overcharge
delay time
charging
Product name / Item
release voltage 1, 2
t
CU
function
V
CD
(C3
=
0.22
µF)
*1 *3
S-8232NAFT-T2-G 4.325 V
±
25 mV 4.325 V
±
25 mV
2.40 V
±
80 mV 3.00 V
±
100 mV 0.15 V
±
20 mV
1.0 s
Unavailable
Overcharge
detection
voltage 1, 2
V
CU
Overdischarge
detection
voltage 1, 2
V
DD
Overdischarge
release
voltage1, 2
V
DU
Overcurrent
detection
voltage 1
V
IOV1
S-8232NBFT-T2-G
S-8232NCFT-T2-G
S-8232NDFT-T2-G
S-8232NEFT-T2-G
S-8232NFFT-T2-G
S-8232NGFT-T2-G
S-8232NHFT-T2-G
S-8232NIFT-T2-G
S-8232NJFT-T2-G
S-8232NKFT-T2-G
S-8232NLFT-T2-G
S-8232NMFT-T2-G
S-8232NNFT-T2-G
S-8232NPFT-T2-G
S-8232NQFT-T2-G
S-8232NRFT-T2-G
S-8232NSFT-T2-G
S-8232NUFT-T2-G
4.35 V
±
25 mV
4.275 V
±
25 mV
4.35 V
±
25 mV
4.35 V
±
25 mV
4.325 V
±
25 mV
4.35 V
±
25 mV
4.28 V
±
25 mV
4.25 V
±
25 mV
4.28 V
±
25 mV
4.35 V
±
25 mV
4.30 V
±
25 mV
4.28 V
±
25 mV
4.28 V
±
25 mV
4.25 V
±
25 mV
4.25 V
±
25 mV
4.15 V
±
25 mV
4.15 V
±
25 mV
3.85 V
±
25 mV
4.25 V
±
50 mV
4.05 V
±
50 mV
4.15 V
±
50 mV
4.15 V
±
50 mV
4.1 V
±
50 mV
*3
3.00 V
±
80 mV
2.20 V
±
80 mV
2.30 V
±
80 mV
2.30 V
±
80 mV
2.30 V
±
80 mV
2.60 V
±
80 mV
2.30 V
±
80 mV
2.50 V
±
80 mV
2.30 V
±
80 mV
2.30 V
±
80 mV
2.30 V
±
80 mV
2.30 V
±
80 mV
2.20 V
±
80 mV
2.20 V
±
80 mV
2.30 V
±
80 mV
2.60 V
±
80 mV
2.60 V
±
80 mV
2.30 V
±
80 mV
2.00 V
±
80 mV
2.23 V
±
80 mV
2.00 V
±
80 mV
*3
3.70 V
±
100 mV
3.00 V
±
100 mV
2.30 V
±
80 mV
3.00 V
±
100 mV
2.90 V
±
100 mV
3.00 V
±
100 mV
2.90 V
±
100 mV
3.00 V
±
100 mV
2.90 V
±
100 mV
2.30 V
±
80 mV
3.00 V
±
100 mV
2.90 V
±
100 mV
2.40 V
±
100 mV
2.40 V
±
100 mV
3.00 V
±
100 mV
3.00 V
±
100 mV
3.00 V
±
100 mV
3.00 V
±
100 mV
2.00 V
±
100 mV
2.23 V
±
80 mV
2.00 V
±
80 mV
0.30 V
±
20 mV
0.20 V
±
20 mV
0.15 V
±
20 mV
0.23 V
±
20 mV
0.21 V
±
20 mV
0.30 V
±
20 mV
0.11 V
±
20 mV
0.15 V
±
20 mV
0.11 V
±
20 mV
0.12 V
±
20 mV
0.23 V
±
20 mV
0.08 V
±
20 mV
0.13 V
±
20 mV
0.13 V
±
20 mV
0.30 V
±
20 mV
0.30 V
±
20 mV
0.30 V
±
20 mV
0.30 V
±
20 mV
0.09 V
±
20 mV
0.15 V
±
20 mV
0.09 V
±
20 mV
1.0 s
1.0 s
1.0 s
1.0 s
1.0 s
1.0 s
1.0 s
1.0 s
1.0 s
1.0 s
1.0 s
1.0 s
1.0 s
1.0 s
1.0 s
1.0 s
1.0 s
1.0 s
1.0 s
1.0 s
1.0 s
Unavailable
Unavailable
Available
Available
Unavailable
Available
Unavailable
Unavailable
Available
Available
Available
Available
Unavailable
Unavailable
Unavailable
Unavailable
Unavailable
Unavailable
Unavailable
Available
Unavailable
4.15 V
±
50 mV
4.05 V
±
50 mV
4.05 V
±
50 mV
*3
4.05 V
±
50 mV
4.15 V
±
50 mV
4.05 V
±
50 mV
4.05 V
±
50 mV
4.08 V
±
50 mV
*3
S-8232NOFT-T2-G 4.295 V
±
25 mV
4.045 V
±
50 mV
4.05 V
±
50 mV
4.05 V
±
50 mV
3.95 V
±
50 mV
3.95 V
±
50 mV
4.15 V
±
50 mV
3.75 V
±
50 mV
S-8232NTFT-T2-G 4.225 V
±
25 mV
S-8232NWFT-T2-G 4.210 V
±
25 mV
4.125 V
±
50 mV
*1.
*2.
*3.
*4.
No overcharge detection / release hysteresis
The magnification of final overcharge is 1.11; the others are 1.25.
No final overcharging function
Refer to the
*2
in the
“ Operation
”.
Remark 1.
Please contact our sales office for the products with detection voltage value other than those
specified above.
2.
The overdischarge detection voltage can be selected within the range from 1.7 to 3.0 V. When the
overdischarge detection voltage is higher than 2.6 V, the overcharge detection voltage and the
overcharge release voltage are limited as “
Table 2
”.
Table 2
Overdischarge
detection voltage 1, 2
V
DD
1.70 to 2.60 V
1.70 to 2.80 V
1.70 to 3.00 V
Overcharge
detection voltage 1, 2
V
CU
3.85 to 4.60 V
3.85 to 4.60 V
3.85 to 4.50 V
Voltage difference between overcharge detection
voltage and overcharge release voltage
V
CU
−
V
CD
0 to 0.30 V
0 to 0.20 V
0 to 0.10 V
4
Seiko Instruments Inc.
Rev.5.4
_00
Pin Configuration
8-Pin TSSOP
Top view
BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK
S-8232 Series
Table 3
8
7
6
5
SENS
DO
CO
VM
1
2
3
4
VCC
VC
ICT
VSS
Pin No.
1
Symbol
SENS
2
3
4
5
6
7
8
DO
CO
VM
VSS
ICT
VC
VCC
Figure 2
Description
Detection pin for voltage between SENS and
VC (Detection for overcharge and
overdischarge)
FET gate connection pin for discharge
control (CMOS output)
FET gate connection pin for charge control
(CMOS output)
Detection pin for voltage between VM and
VSS (Overcurrent detection pin)
Negative power input pin
Capacitor connection pin for detection delay
Middle voltage input pin
Positive power input pin
Seiko Instruments Inc.
5
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