Contents
Features.............................................................. 1
Applications......................................................... 1
Selection Guide................................................... 2
Block Diagram..................................................... 3
Pin Assignment ................................................... 4
Pin Description.................................................... 4
Absolute Maximum Ratings................................. 4
Electrical Characteristics ..................................... 5
Measuremnet Circuits ......................................... 7
Description .......................................................... 10
Operation Timing Charts ..................................... 13
Battery Protection IC Connection Example ......... 14
Precautions ......................................................... 16
Dimensions ......................................................... 17
Markings ............................................................. 17
Taping ................................................................ 18
Characteristcs (typical characteristics) ................ 20
12 Nov,1997
BATTERY PROTECTION IC (FOR A SINGLE-CELL PACK)
S-8231 SERIES
The 8231 is a series of lithium-ion rechargeable battery protection ICs
incorporating high-accuracy voltage detection circuits and delay circuits.
It is suitable for a single-cell lithium-ion battery pack.
Features
(1)
Internal high-accuracy voltage detection circuit
Over charge detection voltage
Over charge release voltage
4.00 V
±
25 mV to 4.60 V
±
25 mV
5 mV- step
3.70 V
±
50 mV to 4.60 V
±
50m V
5 mV- step
(The Over charge release voltage can be selected within the range where the difference from
Over charge detection voltage is 0 to 0.3 V)
Over discharge detection voltage
Over discharge release voltage
1.70 V
±
80 mV to 2.50 V
±
80 mV
50 mV- step
1.70 V
±
100 mV to 3.50 V
±
100 mV
50 mV - step
(The over discharge release voltage can be selected within the range where a difference from
over discharge detection voltage is 0 to 1.0V)
Over current detection voltage 1
(2)
(3)
(4)
0.06 V
±
20 mV to 0.30 V
±
20 mV
5 mV-step
High input-voltage device (absolute maximum rating: 18 V)
Wide operating voltage range:
1.5 V to 16 V
The delay time for every detection can be set via an external capacitor.
Each delay time for Over charge detection, Over discharge detection, Over current detection are
“Proportion
of hundred to ten to One.“ or
“Proportion
of fifty to ten to One.“
(5)
(6)
(7)
(8)
Two over current detection levels (protection for short-circuiting)
Internal auxiliary over voltage detection circuit (Fail safe for over voltage)
Internal charge circuit for 0V battery (Unavailable is option)
Low current consumption
7.5
µA
typ. 13.7
µA
max. (-40 to +85
°C)
Power-down mode 0.2 nA typ. 0.14
µA
max. (-40 to +85
°C)
Operation
(9)
MSOP package (8-pin) 4.0 mm×2.95 mm
Applications
Lithium-ion rechargeable battery packs
The Information herein is subject to change without notice.
Seiko Instruments Inc.
1
Battery Protection IC (for a single-cell pack)
S-8231 Series
12 Nov , 1997
Selection Guide(12 Nov , 1997)
Table1
Model/Item
Over charge
detection voltage
Over charge
release voltage
Over discharge
detection voltage
Over discharge
release voltage
Over current
detection
voltage1
S-8231AAFN
S-8231ABFN
S-8231ACFN
S-8231ADFN
S-8231AEFN
S-8231AGFN
S-8231AHFN
S-8231AIFN
S-8231AJFN
S-8231AKFN
S-8231ALFN
S-8231AMFN
S-8231ANFN
S-8231AOFN
S-8231AQFN
S-8231ARFN
S-8231ASFN
S-8231ATFN
S-8231AVFN
S-8231AWFN
4.25V±25mV
4.35V±25mV
4.25V±25mV
4.25V±25mV
4.25V±25mV
4.25V±25mV
4.35V±25mV
4.25V±25mV
4.25V±25mV
4.25V±25mV
4.295V±25mV
4.25V±25mV
4.35V±25mV
4.295V±25mV
4.20V±25mV
4.20V±25mV
4.12V±25mV
4.35V±25mV
4.28V±25mV
4.28V±25mV
4.05±50mV
4.10±50mV
4.05±50mV
4.05±50mV
3.95±50mV
4.05±50mV
4.28±50mV
4.05V *2
4.05±50mV
4.05±50mV
4.20±50mV *3
4.05±50mV
4.10±50mV
4.295V *1,3
4.10±50mV
4.10±50mV
4.12 *1,3
4.10±50mV
4.05±50mV
4.18±50mV
2.30V±80mV
2.30V±80mV
2.30V±80mV
2.30V±80mV
2.30V±80mV
2.30V±80mV
2.30V±80mV
2.30V±80mV
2.30V±80mV
2.30V±80mV
2.50V±80mV
2.30V±80mV
2.30V±80mV
2.30V±80mV
2.30V±80mV
2.30V±80mV
2.30V±80mV
2.30V±80mV
2.30V±80mV
2.30V±80mV
2.70V±100mV
3.00V±100mV
2.50V±100mV
2.50V±100mV
3.00V±100mV
2.70V±100mV
2.80V±100mV
2.70V±100mV
2.50V±100mV
2.50V±100mV
3.00V±100mV
2.70V±100mV
3.00V±100mV
3.00V±100mV
2.50V±100mV
2.50V±100mV
2.50V±100mV
3.00V±100mV
2.70V±100mV
2.90V±100mV
0.100V±20mV
0.100V±20mV
0.120V±20mV
0.240V±20mV
0.100V±20mV
0.150V±20mV
0.100V±20mV
0.150V±20mV
0.120V±20mV
0.240V±20mV
0.150V±20mV
0.130V±20mV
0.100V±20mV
0.300V±20mV
0.200V±20mV
0.100V±20mV
0.200V±20mV
0.250V±20mV
0.130V±20mV
0.080V±20mV
Over charge
detection delay
(C2=0.047µ⋅F)
1.0 sec
1.0 sec
0.5 sec
0.5 sec
1.0 sec
1.0 sec
1.0 sec
1.0 sec
0.5 sec
0.5 sec
1.0 sec
1.0 sec
0.5 sec
1.0 sec
1.0 sec
1.0 sec
1.0 sec
1.0 sec
1.0 sec
1.0 sec
0V battery
charging
function
Available
Available
Unavailable
Unavailable
Available
Available
Available
Available
Available
Available
Unavailable
Unavailable
Unavailable
Unavailable
Unavailable
Unavailable
Unavailable
Available
Unavailable
Unavailable
*1) Without over charge detection / release hysteresis.
*2) Discharging will be unable when over charge detected. (Over charge lock type)
*3) Auxiliary over charge detection voltage(VCUaux) is VCUaux = VCU(Over charge detection voltage) X 1.10, which is fixed internally.
The others are VCUaux = VCU X 1.24.
Change in the detection voltage is available in products other than the above listed ones.
Please contact with our sales division.
The over discharge detection voltage can be selected within the range from 1.7 to 3.0V. When the Over
discharge detection voltage is higher than 2.5V, the Over charge detection voltage and the Over charge
release voltage are limited as follows table.
Table 2
Over discharge
detection voltage
(VDD)
1.70 to 2.50 V
1.70 to 2.70 V
1.70 to 3.00 V
Over charge
detection voltage
(VCU)
4.00 to 4.60 V
4.00 to 4.50 V
4.00 to 4.35 V
Voltage difference between
Over charge detection voltage and
Over charge release voltage
0 to 0.30 V
0 to 0.20 V
0 to 0.10 V
2
Seiko Instruments Inc.
12 Nov , 1997
Battery Protection IC (for a single-cell pack)
S-8231 Series
Block Diagram
VCC
SENS
DO
Over discharge
+
-
Over charge
Control
logic
CO
+
-
Delay circuit
control signal
RCOL
+
Reference
voltage
Over current
detection circuit
Delay circuit
control signal
Delay
circuit
VM
-
-
Auxiliary
Over charge
Delay circuit
control signal
Control signal
VSS
ICT
Figure 1
Output impedance when CO terminal output ‘L’ is higher than DO terminal. Resistor (RCOL) is connected
with CO terminal. Please refer ‘Electric Characteristics’.
Seiko Instruments Inc.
3
Battery Protection IC (for a single-cell pack)
S-8231 Series
12 Nov , 1997
Pin Assignment
Top View
SENS
DO
CO
VM
1
2
3
4
8
7
6
5
VCC
NC
Pin Description
Table.3
No.
1
Name
SENS
Description
Detects voltage between Vss to SENS(Over charge/discharge
detection pin)
2
DO
CO
VM
VSS
ICT
NC
VCC
Connects FET gate for discharge control (CMOS output)
Connects FET gate for charge control (CMOS output)
Detects voltage between VSS to VM(Over current detection pin)
Negative power input
Connects capacitor for every detection delay circuit
Non connect
Positive power input and connects battery positive voltage
ICT
VSS
3
4
5
6
7
8
Figure 2
MSOP - 8
Absolute Maximum Ratings
Table 4
Item
Input voltage between VCC and VSS
ICT input terminal voltage
VM input terminal voltage
DO output terminal voltage
CO output terminal voltage
Power dissipation
Operating temperature range
Storage temperature range
Sym.
VDS
VICT
VVM
VDO
VCO
PD
Topr
Tstg
Applied Pins
VCC
ICT
VM
DO
CO
Rating
VSS-0.3 to VSS+18
VSS-0.3 to VCC+0.3
VCC-18 to VCC+0.3
VSS-0.3 to VCC+0.3
VM-0.3 to VCC+0.3
150
-40 to +85
-40 to +125
Ta = 25°C
Unit
V
V
V
V
V
mW
°C
°C
4
Seiko Instruments Inc.
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