S-8231 SERIES 8231 series lithium-ion rechargeable battery protec

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S-8231 SERIES 8231 series lithium-ion rechargeable battery protec

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BATTERY PROTECTION (FOR SINGLE-CELL PACK)
S-8231 SERIES
8231 series lithium-ion rechargeable battery protection incorporating high-accuracy voltage detection circuits delay circuits. suitable single-cell lithium-ion battery pack.
Features
Internal high-accuracy voltage detection circuit Overcharge detection voltage Overcharge release voltage
4.00 4.60 step 3.70 4.60 step
(The Overcharge release voltage selected within range where difference from
Overcharge detection voltage Overdischarge detection voltage Overdischarge release voltage 1.70 2.50 step 1.70 3.50 step (The overdischarge release voltage selected within range where difference from overdischarge detection voltage 1.0V) Overcurrent detection voltage
0.06 0.30 mV-step
High input-voltage device (absolute maximum rating: Wide operating voltage range: Wide operating range:
delay time every detection external capacitor. Each delay time Overcharge detection, Overdischarge detection, Overcurrent detection Proportion hundred One. Proportion fifty One.
overcurrent detection levels (protection short-circuiting) Internal auxiliary over voltage detection circuit (Fail safe over voltage) Internal charge circuit battery (Unavailable option) current consumption Operation typ. 13.7 max. (-40 Power-down mode typ. 0.14 max. (-40
(10)
MSOP package (8-pin)
Applications
Lithium-ion rechargeable battery packs
Seiko Instruments Inc.
Battery Protection (for single-cell pack) S-8231 Series
Selection Guide(6, Aug, 1999)
series
ModelItem Overcharge detection voltage
Table1
Overcharge Overdischarg Overdischarge release detection release voltage voltage voltage Overcurrent detection voltage1 Overcharge detection delay (C2=0.047 battery charging function Auxiliary overcharge detection vol. Magnification 1.24 1.24 1.24 1.24 1.24 1.24 1.24 1.24 1.24 1.24 1.10 1.24 1.24 1.10 1.24 1.24 1.10 1.24 1.24 1.24 1.24 Unavailable 1.24 1.24 1.24 Unavailable 1.24
S-8231AAFN-CAA-T2 S-8231ABFN-CAB-T2 S-8231ACFN-CAC-T2 S-8231ADFN-CAD-T2 S-8231AEFN-CAE-T2 S-8231AGFN-CAG-T2 S-8231AHFN-CAH-T2 S-8231AIFN-CAI-T2 S-8231AJFN-CAJ-T2 S-8231AKFN-CAK-T2 S-8231ALFN-CAL-T2 S-8231AMFN-CAM-T2 S-8231ANFN-CAN-T2
4.25V±25mV 4.05±50mV 2.30V±80mV 2.70V±100mV 0.100V±20mV 4.35V±25mV 4.10±50mV 2.30V±80mV 3.00V±100mV 0.100V±20mV 4.25V±25mV 4.05±50mV 2.30V±80mV 2.50V±100mV 0.120V±20mV 4.25V±25mV 4.05±50mV 2.30V±80mV 2.50V±100mV 0.240V±20mV 4.25V±25mV 3.95±50mV 2.30V±80mV 3.00V±100mV 0.100V±20mV 4.25V±25mV 4.05±50mV 2.30V±80mV 2.70V±100mV 0.150V±20mV 4.35V±25mV 4.28±50mV 2.30V±80mV 2.80V±100mV 0.100V±20mV 4.25V±25mV 4.05V 2.30V±80mV 2.70V±100mV 0.150V±20mV
Available Available Unavailable Unavailable Available Available Available Available Available Available Unavailable Unavailable Unavailable Unavailable Unavailable Unavailable Unavailable Available Available Unavailable Unavailable Unavailable Available Unavailable Unavailable Available Unavailable
4.25V±25mV 4.05±50mV 2.30V±80mV 2.50V±100mV 0.120V±20mV 4.25V±25mV 4.05±50mV 2.30V±80mV 2.50V±100mV 0.240V±20mV 4.295V±25mV 4.20±50mV 2.50V±80mV 3.00V±100mV 0.150V±20mV 4.25V±25mV 4.05±50mV 2.30V±80mV 2.70V±100mV 0.130V±20mV 4.35V±25mV 4.10±50mV 2.30V±80mV 3.00V±100mV 0.100V±20mV
S-8231AOFN-CAO-T2 4.295V±25mV 4.295V 2.30V±80mV 3.00V±100mV 0.300V±20mV S-8231AQFN-CAQ-T2 S-8231ARFN-CAR-T2 S-8231ASFN-CAS-T2 S-8231ATFN-CAT-T2 S-8231AUFN-CAU-T2 S-8231AVFN-CAV-T2 4.20V±25mV 4.10±50mV 2.30V±80mV 2.50V±100mV 0.200V±20mV 4.20V±25mV 4.10±50mV 2.30V±80mV 2.50V±100mV 0.100V±20mV 4.12V±25mV 4.12V 2.30V±80mV 2.50V±100mV 0.200V±20mV
4.35V±25mV 4.10±50mV 2.30V±80mV 3.00V±100mV 0.250V±20mV 4.28V±25mV 4.05±50mV 2.30V±80mV 2.70V±100mV 0.130V±20mV 4.28V±25mV 4.05±50mV 2.30V±80mV 2.70V±100mV 0.130V±20mV
S-8231AWFN-CAW-T2 4.28V±25mV 4.18±50mV 2.30V±80mV 2.90V±100mV 0.080V±20mV S-8231AXFN-CAX-T2 4.295V±25mV 4.295V S-8231NAFN-CDA-T2 S-8231NBFN-CDB-T2 S-8231NCFN-CDC-T2 S-8231NDFN-CDD-T2 S-8231NEFN-CDE-T2 2.30V±80mV 3.00V±100mV 0.300V±20mV
4.33V±25mV 4.28±50mV 2.30V±80mV 2.80V±100mV 0.100V±20mV 4.28V±25mV 3.98±50mV 2.30V±80mV 2.35V±100mV 0.125V±20mV 4.28V±25mV 4.18±50mV 2.30V±80mV 2.90V±100mV 0.060V±20mV 4.25V±25mV 4.05±50mV 2.30V±80mV 2.70V±100mV 0.130V±20mV 4.20V±25mV 4.07±50mV 2.50V±80mV 2.75V±100mV 0.200V±20mV
Seiko Instruments Inc.
series
ModelItem Overcharge detection voltage 50°C) Overcharge release voltage
Battery Protection (for single-cell pack) S-8231 Series
Overdischarge Overdischarge release voltage detection voltage
Overcurrent detection voltage1
Overcharge detection delay (C2=0.047
battery charging function
Auxiliary overcharge detection vol. Magnification 1.24 1.24 1.24 1.24
S-8231BAFN-CCA-T2 4.18V±30mV 3.98V±50mV S-8231BBFN-CCB-T2 4.18V±30mV 4.08V±50mV S-8231BGFN-CCG-T2 4.28V±30mV 4.08V±50mV S-8231BIFN-CCI-T2 4.28V±30mV 4.08V±50mV
2.60V±80mV 2.30V±80mV 2.60V±80mV 2.60V±80mV
2.90V±100mV 2.90V±100mV 2.90V±100mV 2.90V±100mV
0.110V±20mV 0.110V±20mV 0.080V±20mV 0.080V±20mV
Available Available Unavailabl Available
S-8231BKFN-CCK-T2 4.22V±30mV 4.22V 0V±80mV 2.30V 0.200V±20mV Available Unavailable Without overcharge detection release hysteresis. Discharging will unable when overcharge detected. (Overcharge lock type) Auxiliary overcharge detection voltage comes three types, i.e., overcharge detection voltage (VCU) times, overcharge detection voltage (VCU) 1.10 times, final overcharge detection function. hysteresis between overdischarge detection release.
Change detection voltage available products other than above listed ones. Please contact with sales division.
overdischarge detection voltage selected within range from 3.0V. When Overdischarge detection voltage higher than 2.5V, Overcharge detection voltage Overcharge release voltage limited follows table.
Table
Overdischarge detection voltage (VDD) 1.70 2.50 1.70 2.70 1.70 3.00 Overcharge detection voltage (VCU) 4.00 4.60 4.00 4.50 4.00 4.35 Voltage difference between Overcharge detection voltage Overcharge release voltage 0.30 0.20 0.10
Seiko Instruments Inc.
Battery Protection (for single-cell pack) S-8231 Series
Block Diagram
SENS
Over discharge
Over charge Control logic
Delay circuit control signal
RCOL
Reference voltage
Over current detection circuit Delay circuit control signal Delay circuit
-Auxiliary Over charge Delay circuit control signal Control signal
Figure
Output impedance when terminal output higher than terminal. Resistor (RCOL) connected with terminal. Please refer `Electric Characteristics'.
Seiko Instruments Inc.
Battery Protection (for single-cell pack) S-8231 Series
Assignment
View
SENS
Description
Table.3
Name SENS Description Detects voltage between SENS(Overcharge/discharge detection pin) Connects gate discharge control (CMOS output) Connects gate charge control (CMOS output) Detects voltage between VM(Overcurrent detection pin) Negative power input Connects capacitor every detection delay circuit connect Positive power input connects battery positive voltage
Figure
MSOP
Absolute Maximum Ratings
Table
Item Input voltage between input terminal voltage input terminal voltage output terminal voltage output terminal voltage Power dissipation Operating temperature range Storage temperature range Sym. VICT Topr Tstg Applied Pins Rating VSS-0.3 VSS+18 VSS-0.3 VCC+0.3 VCC-18 VCC+0.3 VSS-0.3 VCC+0.3 VM-0.3 VCC+0.3 +125
25°C
Unit
Seiko Instruments Inc.
Battery Protection (for single-cell pack) S-8231 Series
Electrical Characteristics
Table
Item Detection voltage Overcharge detection voltage (S-8231A series) Auxiliary overcharge detection voltage (*3) Overcharge release voltage Overdischarge detection voltage Overdischarge release voltage Overcurrent detection voltage1 Overcurrent detection voltage Voltage temperature factor (*1) Voltage temperature factor (*2) Delay time(C2=0.047µF) Overcharge detection delay time (*4) Overdischarge detection delay time Overcurrent detection delay time Input voltage Input voltage between Operating voltage Operating voltage between (*5) Current consumption Current consumption (during normal operation) Current consumption power down Output voltage voltage voltage voltage internal resistance Resistance between Internal resistance Resistance between Resistance between battery charging function charge starting voltage charge inhibiting voltage V0CHA V0INH batt. cha. Available batt. cha. Unavailable 0.52 0.40 0.73 0.61 1.32 1.11 Rvcm Rvsm VCC-VM=0.5V VSS-VM=1.1V 0.07 0.73 0.16 1.05 0.38 1.73 RCOL VSS-CO=4.7V 0.29 0.60 1.43 VDO(H) VDO(L) VCO(H) Iout=10uA Iout=10uA Iout=10uA VCC-0.07 VCC-0.25 VCC-0.006 VSS+0.006 VCC-0.032 VSS+0.07 IOPE IPDN VCC=3.6V VCC=1.5V 0.0002 12.2 0.06 VDSOP absolute maximum rating -0.3 tIOV1 Type Type 0.01 0.72 0.36 1.32 0.66 13.8 VCUaux VCUaux VIOV1 VIOV2 TCOE1 TCOE2 4.00 4.60 Adjustment Fixed Type Fixed Type 3.70 4.60 Adjustment 1.70 2.50 Adjustment 1.70 3.50 Adjustment 0.06 0.30V Adjustment Reference (*1)Ta=-40 85°C (*2)Ta=-40 85°C -0.025 VCD-0.05 VDD-0.08 VDU-0.10 VIOV1 -0.020 -1.72 -0.5 -0.15 VIOV1 -1.35 +0.025 VCD+0.05 VDD+0.08 VDU+0.10 VIOV1 +0.020 -0.98 0.15 mV/° mV/° Symbol Condition Circuit Notice Min. Typ.
25°C
Max. Unit
(*1) Voltage temperature factor indicates overcharge detection voltage, overcharge release voltage, overdischarge detection voltage, overdischarge release voltage. (*2)Voltage temperature factor indicates overcurrent detection voltage. (*3) final overcharge detection voltage products without overcharge hysteresis 1.10 times overcharge detection voltage. (*4) overcharge detection delay time either depending upon product type 0.047µF). (*5) operation voltage indicates voltage between where logic established. (*6) battery function either battery charging function" battery charge inhibiting function" depending upon product type.
Seiko Instruments Inc.
Battery Protection (for single-cell pack) S-8231 Series
Table
Item Symbol VCUaux VCUaux VIOV1 VIOV2 TCOE1 TCOE2 Condition Circuit Notice 4.00 4.60 Adjustment Fixed Type Fixed Type 3.70 4.60 Adjustment 1.70 2.50 Adjustment 1.70 3.50 Adjustment 0.06 0.30V Adjustment Reference (*1)Ta=-40 85°C (*2)Ta=-40 85°C Min. -0.045 VCD-0.070 VDD-0.100 VDU-0.120 VIOV1 -0.027 -1.81 -0.5 -0.15
+70°C
Typ. VIOV1 -1.35 Max. +0.035 VCD+0.060 VDD+0.090 VDU+0.110 VIOV1 +0.027 -0.89 0.15 Unit mV/° mV/°
Detection voltage Overcharge detection voltage Auxiliary overcharge detection voltage (*3) Overcharge release voltage Overdischarge detection voltage Overdischarge release voltage Overcurrent detection voltage1 Overcurrent detection voltage Voltage temperature factor (*1) Voltage temperature factor (*2) Delay time(C2=0.047µF) Overcharge detection delay time (*4) Overdischarge detection delay time Overcurrent detection delay time Input voltage Input voltage between Operating voltage Operating voltage between (*5) Current consumption Current consumption (during normal operation) Current consumption power down Output voltage voltage voltage voltage internal resistance Resistance between Internal resistance Resistance between Resistance between battery charging function charge starting voltage charge inhibiting voltage V0CHA V0INH batt. cha. Available batt. cha. Unavailable 0.43 0.31 0.73 0.61 1.41 1.20 Rvcm Rvsm VCC-VM=0.5V VSS-VM=1.1V 0.06 0.60 0.16 1.05 0.52 2.35 RCOL VSS-CO=4.7V 0.24 0.60 1.95 VDO(H) VDO(L) VCO(H) Iout=10uA Iout=10uA Iout=10uA VCC-0.16 VCC-0.34 VCC-0.006 VSS+0.006 VCC-0.032 VSS+0.16 IOPE IPDN VCC=3.6V VCC=1.5V 0.0002 13.4 0.08 VDSOP absolute maximum rating -0.3 tIOV1 Type Type 0.01 0.67 0.33 1.42 0.71 14.0
(*1) Voltage temperature factor indicates overcharge detection voltage, overcharge release voltage, overdischarge detection voltage, overdischarge release voltage. (*2)Voltage temperature factor indicates overcurrent detection voltage. (*3) final overcharge detection voltage products without overcharge hysteresis 1.10 times overcharge detection voltage. (*4) overcharge detection delay time either depending upon product type 0.047µF). (*5) operation voltage indicates voltage between where logic established. (*6) battery function either battery charging function" battery charge inhibiting function" depending upon product type.
Seiko Instruments Inc.
Battery Protection (for single-cell pack) S-8231 Series
Table
Item Detection voltage Overcharge detection voltage Auxiliary overcharge detection voltage (*3) Overcharge release voltage Overdischarge detection voltage Overdischarge release voltage Overcurrent detection voltage1 Overcurrent detection voltage Voltage temperature factor (*1) Voltage temperature factor (*2) Delay time(C2=0.047µF) Overcharge detection delay time (*4) Overdischarge detection delay time Overcurrent detection delay time Input voltage Input voltage between Operating voltage Operating voltage between (*5) Current consumption Current consumption (during normal operation) Current consumption power down Output voltage voltage voltage voltage internal resistance Resistance between Internal resistance Resistance between Resistance between battery charging function charge starting voltage charge inhibiting voltage V0CHA V0INH batt. cha. Available batt. cha. Unavailable 0.40 0.28 0.73 0.61 1.45 1.24 Rvcm Rvsm VCC-VM=0.5V VSS-VM=1.1V 0.05 0.56 0.16 1.05 0.58 2.63 RCOL VSS-CO=4.7V 0.22 0.60 2.18 VDO(H) VDO(L) VCO(H) Iout=10uA Iout=10uA Iout=10uA VCC-0.19 VCC-0.37 VCC-0.006 VSS+0.006 VCC-0.032 IOPE IPDN VCC=3.6V VCC=1.5V 0.0002 13.7 0.14 VDSOP absolute maximum rating -0.3 tIOV1 Type Type 0.01 0.64 0.32 1.00 0.50 1.46 0.73 14.1 VCUaux VCUaux VIOV1 VIOV2 TCOE1 TCOE2 4.00 4.60 Adjustment Fixed Type Fixed Type 3.70 4.60 Adjustment 1.70 2.50 Adjustment 1.70 3.50 Adjustment 0.06 0.30V Adjustment Reference (*1)Ta=-40 85°C (*2)Ta=-40 85°C VCU1 -0.060 VCD-0.085 VDD-0.115 VDU-0.135 VIOV1 -0.030 -1.85 -0.5 -0.15 VIOV1 -1.35 Symbol Condition Circuit Notice Min. Typ. Max.
+85°C
Unit mV/°C mV/°C
VCU1 +0.035 VCD+0.060 VDD+0.090 VDU+0.110 VIOV1 +0.030 -0.86 0.15
VSS+0.19
(*1) Voltage temperature factor indicates overcharge detection voltage, overcharge release voltage, overdischarge detection voltage, overdischarge release voltage. (*2)Voltage temperature factor indicates overcurrent detection voltage. (*3) final overcharge detection voltage products without overcharge hysteresis 1.10 times overcharge detection voltage. (*4) overcharge detection delay time either depending upon product type 0.047µF). (*5) operation voltage indicates voltage between where logic established. (*6) battery function either battery charging function" battery charge inhibiting function" depending upon product type.
Seiko Instruments Inc.
Battery Protection (for single-cell pack) S-8231 Series
Measurement Circuits
Measurement Measurement circuit S1=OFF, V1=3.6V, V2=0V under normal condition. Increase from 3.6V gradually. voltage when overcharge detection voltage (VCU). Decrease gradually. voltage when overcharge release voltage (VCD). Further decrease voltage when overdischarge voltage (VDD). Increase gradually. voltage when overdischarge release voltage (VDU). S1=ON,and V1=3.6V V2=0V under normal condition. Increase from 3.6V gradually. voltage when auxiliary overcharge detection voltage (VCUaux). Measurement Measurement circuit S1=OFF,V1=3.6V, V2=0V under normal condition. Increase from gradually. voltage when overcurrent detection voltage (VIOV1). S1=ON,V1=3.6V, V2=0V under normal condition. Increase gradually from (The voltage change rate 1.0V/msec). (V2-V1) voltage when overcurrent detection voltage (VIOV2). Measurement Measurement circuit S1=ON, V1=3.6V, V2=0 under normal condition measure current consumption. Current consumption normal condition current consumption (IOPE). S1=OFF, V1=V2=1.5 under overdischarge condition measure current consumption. Current consumption power-down current consumption (IPDN). Measurement Measurement circuit S1=ON, V1=1.5V V2=1.0V under overdischarge condition. (V1-V2)/I2 internal resistance between (Rvcm). S1=ON, V1=3.6 V2=1.1V under overcurrent condition. V2/I2 internal resistance between (Rvsm). Measurement Measurement circuit S1=ON, S2=OFF, V1=3.6V, V2=0V under normal condition. Increase from gradually. voltage when voltage (VDO (H)). S1=OFF, S2=ON, V1=3.6V, V2=0.5 under overcurrent condition. Increase from gradually. voltage when voltage (VDO (L)). Measurement Measurement circuit S1=ON, S2=OFF, V1=3.6V V2=0 under normal condition. Increase from gradually. voltage when CO'H' voltage (VCO (H)). S1=OFF S2=ON, V1=4.7 V2=0 V4=4.7V under over voltage condition. (V4)/I2 internal resistance (RCOL).
Seiko Instruments Inc.
Battery Protection (for single-cell pack) S-8231 Series
Measurement Measurement circuit
V1=3.6V V2=0 (VCU 0.2V) under normal condition. Increase from (VCU 0.2V) (VCU 0.2V) immediately (within µs). time after becomes (VCU 0.2V) until goes overcharge detection delay time (tCU). V1=3.6V V2=0V (VDD 0.2V) under normal condition. Decrease from (VDD 0.2V) (VDD immediately (within µs). time after becomes (VDD until goes overdischarge detection delay time (tDD). Measurement Measurement circuit V1=3.6V under normal condition. Increase from immediately (within µs). time after becomes 0.5V until goes overcurrent detection delay time (tIOV1). Measurement Measurement circuit V1=0 V2=2 decrease gradually. voltage when (VCC- lower) charge starting voltage (V0CHA). (10) Measurement Measurement circuit V1=0 V2=16 increase gradually. voltage when (VM+0.3 higher) charge inhibiting voltage (V0INH).
Seiko Instruments Inc.
Battery Protection (for single-cell pack) S-8231 Series
SENS S8231 Series
SENS S8231 Series
Measurement circuit
Measurement circuit
SENS S8231 Series
SENS S8231 Series
Measurement circuit
Measurement circuit
SENS
0.047
SENS S8231 Series
S8231 Series
4.7M
Measurement circuit
Measurement circuit
Seiko Instruments Inc.
Battery Protection (for single-cell pack) S-8231 Series
Description Operation
Normal condition(*1) This monitors voltages battery discharge current control charging discharging. voltages battery range from overdischarge detection voltage (VDD) overcharge detection voltage (VCU), current flowing through battery becomes equal lower than specified value (the terminal voltage equal lower than overcurrent detection voltage charging discharging FETs turn this condition, charging discharging carried freely. This condition called normal condition. this condition, terminals shorted Rvsm resistor. Overcurrent condition discharging current becomes equal higher than specified value (the terminal voltage equal higher than overcurrent detection voltage) during discharging under normal condition continues overcurrent detection delay time (tIOV1) longer, discharging turns stop discharging. This condition called overcurrent condition. terminals shorted Rvsm resistor this time. Also charging turns off. When discharging load connected, terminal voltage equals potential. overcurrent condition returns normal condition when load released impedance between terminals (see Figure connection example) 200M higher. When load released, terminal, which terminal shorted with Rvsm resistor, goes back potential. detects that terminal potential returns overcurrent detection voltage (VIOV1) returns normal condition. Overcharge condition overcharge condition detected cases: battery voltages becomes higher than overcharge detection voltage (VCU) during charging under normal condition continues overcharge detection delay time (tCU) longer, charging turns stop charging. battery voltages becomes higher than auxiliary overcharge detection voltage (VCUaux) charging turns immediately stop charging. terminals shorted Rvsm resistor under overcharge condition. auxiliary overcharge detection voltage (VCUaux) fixed internally calculated overcharge detection voltage (VCU) follows: VCUaux 1.24 without Overcharge detection release hysteresis VCUaux 1.10
overcharge condition released cases: battery voltage which exceeded overcharge detection voltage (VCU) falls below overcharge release voltage (VCD), charging turns normal condition returns. battery voltage which exceeded overcharge detection voltage (VCU) equal higher than overcharge release voltage (VCD), charger removed, load placed, discharging starts,
Seiko Instruments Inc.
Battery Protection (for single-cell pack) S-8231 Series
charging turns normal condition returns. release mechanism follows: discharge current flows through internal parasitic diode charging immediately after load installed discharging starts, terminal voltage increases about from terminal voltage momentarily. detects this voltage (overcurrent detection voltage higher), releases overcharge condition returns normal condition. Note: Function Overcharge lock type (S-8231AIFN) battery voltages becomes higher than overcharge detection voltage (VCU), charging turns stop charging. When load placed, that condition, discharging turns too. Both charging discharging unable once overcharge detected. This mechanism realize more safety Li-ion battery pack. Overdischarge condition battery voltages falls below overdischarge detection voltage (VDD) during discharging under normal condition continues overdischarge detection delay time (tDD) longer, discharging turns discharging stops. This condition called overdischarge condition. When discharging turns off, terminal voltage becomes equal voltage IC's current consumption falls below power-down current consumption (IPDN). This condition called power-down condition. terminals shorted Rvcm resistor under overdischarge power-down conditions. power-down condition canceled when charger connected voltage between 1.35 higher (overcurrent detection voltage When battery voltages becomes equal higher than overdischarge release voltage (VDU) this condition, overdischarge condition changes normal condition. Delay circuits overcharge detection delay time (tCU), overdischarge detection delay time (tDD), overcurrent detection delay time (tIOV1) changed with external capacitors (C2).The delay time overcharge overdischarge overcurrent detection changed external capacitor. Those three detection delay times consistent with each other, describe below. [For tCU=1.0 type] Overcharge delay time Overdischarge delay time: Overcurrent delay time [For tCU=0.5 type] Overcharge delay time Overdischarge delay time: Overcurrent delay time
Seiko Instruments Inc.
Battery Protection (for single-cell pack) S-8231 Series
delay times calculated following equations: (Ta=-40 +85°C) Overcharge detection delay time Typ. Max. tCU=1.0 type tCU[S] Delay factor 13.62, 21.28, 31.06 [uF] tCU=0.5 type tCU[S] Delay factor 6.809, 10.63, 15.53 [uF] Overdischarge detection delay time tDD[S] Delay factor 1.149, 2.128, 4.511 [uF] Overcurrent detection delay time tIOV1[S] Delay factor 0.143, 0.213, 0.300 [uF]
Note:The delay time overcurrent detection fixed internal circuit. delay time cannot changed external capacitor. battery charging function (*2) This function used recharge connected battery after self-discharge When charging start voltage (V0CHA) higher applied between connecting charger, charging gate fixed potential. When voltage between gate sources charging becomes equal higher than turnon voltage charger voltage, charging turns start charging. this time, discharging turns charging current flows through internal parasitic diode discharging FET. battery voltages become equal higher than overdischarge release voltage (VDU), normal condition returns. battery charge inhibiting function (*2) This function used inhibit recharge connected battery after self-discharge shorted internally. battery voltages become 0.6V lower, charging gate fixed potential. battery voltages 0.6V higher, charging gate turns 4.7M resistor required between terminal terminal. Please refer figure (*1) battery voltages equal lower than overdischarge release voltage (VDU) when they connected first time, normal condition entered. terminal voltage made equal lower than voltage charger connected), normal condition entered. (*2) Some battery providers recommend charge batteries(complete self-discharged). Please refer battery providers.
Seiko Instruments Inc.
Battery Protection (for single-cell pack) S-8231 Series
Operation Timing Charts
Overcharge overdischarge detection
VCUaux
Battery voltage
terminal
terminal
Vcha
terminal
Vcha
Charger connecte Load connecte
Mode
Delay
Delay
Note:
?Normal mode,@ Over charge mode,A Over discharge mode, Bover current mode
Figure
charger assumed charge with constant current.
Overcurrent detection
Battery voltage
termina
termina
termina
VIOV2 VIOV1
Charger connected Load connecte
Mode
Delay tIOV1
Delay tIOV2
Note:
?Normal mode,@Over charge mode,AOver discharge mode,Bover current mode
Figure
charger assumed charge with constant current.
Seiko Instruments Inc.
Battery Protection (for single-cell pack) S-8231 Series
Battery Protection Connection Example
SENS Battery S-8231 Series 0.047
Delay time setting 0.047
FET1
FET2
4.7M
Figure Circuit Table Constant
Symbol FET1 Parts MOSFET Purpose Charge control Recommend -min. -max. -Remarks
FET2
MOSFET Chip resistor
Discharge control
-300
-*1) recommended
Chip capacitor
Filter
0.047µF
0.022µF
recommended
Chip resistor Chip capacitor
Setting delay time
0.047µF
=R1min
=R1max 1.0µF
same value resistor Note leak current
Chip resistor
Protection reverse connecting charger
higher
resistor
necessary. (4.7M) (1.0M) (10M) lower resistor increases current consumption.
Chip resistor
battery charge prevent
Seiko Instruments Inc.
Battery Protection (for single-cell pack) S-8231 Series
prevent from oscillation under overcurrent condition. 1E-5 required. lower than 1E-5, condition moved power down mode when load shorted. required. Overcharge detection voltage increased example 10k(R2) increase Overcharge detection voltage 6.3mV. overcharge detection delay time(tCU), overdischarge detection delay time(tCD), Over current detection delay time(tIOV) changed with external capacitor electrical characteristics. necessary protect when charger connected reverse. Connect more. excessive causes increasing Overcurrent detection voltage (VIOV1). Please refer following formulation. example 50k(R3) increase Overcurrent detection voltage (VIOV1=0.100V) 19mV. 4.7M (R4) prevents battery from charging. Current consumption increased Don't connect charging available type.
!Note: above connection diagram constants guarantee proper operations. Evaluate your actual application constants properly.
Seiko Instruments Inc.
Battery Protection (for single-cell pack) S-8231 Series
Precautions
After overcurrent detection delay, battery voltage equal overdischarge detection voltage(VDD) lower, overdischarge detection delay time becomes shorter than 10mS(min.). occurs because capacitor sets delay times. Cause Capacitor sets delay times. When overcurrent detection released until tIOV1 capacitor being charged S-8231. battery voltage lower than that time, charging goes delay time shorter than typical under condition. Conclusion This phenomenon occurs when battery voltage nearly equal overdischarge voltage(VDD) after overcurrent detected. means that battery capacity small must charged near future. Even state changes overdischarge condition battery package capacity same typical. (Refer fig.6)
Battery voltage
battery voltages equal less over discharge voltage.
terminal
Over discharge detected
VIOV2 over current returns normal current.
terminal VIOV1
Discharge load
Load connect delay time becomes shorter than usual.
Over discharge delay time
Figure
Seiko Instruments Inc.
Battery Protection (for single-cell pack) S-8231 Series
Characteristics (typical characteristics)
Detection voltage temperature characteristics
Overcharge detection voltage temperature VCU=4.30[V]
Overcharge release voltage temperature VCD=4.00[V]
Ta[°C]
Ta[°C]
Overdischarge detection voltage temperature VDD=2.00[V]
Overdischarge release voltage temperature VDU=2.60[V]
Ta[°C]
Ta[°C]
Overcurrent detection voltage temperature VIOV1=0.1[V]
0.13
Overcurrent detection voltage temperature VIOV2=1.35[V] (VCC reference)
VIOV1
VIOV2
0.07
Ta[°C]
Ta[°C]
Seiko Instruments Inc.
Battery Protection (for single-cell pack) S-8231 Series
Current consumption temperature characteristics
Current consumption temperature normal mode Current consumption temperature power-down mode VCC=3.60[V]
VCC=1.50[V]
IPDN [nA]
IOPE [uA]
Ta[°C]
Ta[°C]
Delay time temperature characteristics
Overcharge detection time temperature
C2=0.047[uF] VCC=4.3[V]
Overdischarge detection time temperature
C2=0.047[uF] VCC=1.9[V]
[mS]
Ta[°C]
Ta[°C]
Overcurrent detection time temperature
C2=0.047[uF] VCC=3.6[V]
TIOV1 [mS]
Ta[°C]
Please design applications S-8231 Series with safety mind.
Seiko Instruments Inc.
information described herein subject change without notice. Seiko Instruments Inc. responsible problems caused circuits diagrams described herein whose related industrial properties, patents, other rights belong third parties. application circuit examples explain typical applications products, guarantee success specific mass-production design. When products described herein regulated products subject Wassenaar Arrangement other agreements, they exported without authorization from appropriate governmental authority. information described herein other purposes and/or reproduction copying without express permission Seiko Instruments Inc. strictly prohibited. products described herein cannot used part device equipment affecting human body, such exercise equipment, medical equipment, security systems, equipment, apparatus installed airplanes other vehicles, without prior written permission Seiko Instruments Inc. Although Seiko Instruments Inc. exerts greatest possible effort ensure high quality reliability, failure malfunction semiconductor products occur. user these products should therefore give thorough consideration safety design, including redundancy, fire-prevention measures, malfunction prevention, prevent accidents, fires, community damage that ensue.

S-8231 SERIES 8231 series lithium-ion rechargeable battery protec

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