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S-8232 Series 8232 series lithium-ion rechargeable battery protec


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BATTERY PROTECTION (FOR 2-SERIAL-CELL PACK)
S-8232 Series
8232 series lithium-ion rechargeable battery protection incorporating high-accuracy voltage detection circuits delay circuits. S-8232 suitable 2-serial-cell lithium-ion battery pack.
Features
Internal high-accuracy voltage detection circuit Overcharge detection voltage Overcharge release voltage 3.90 4.60 step 3.60 4.60 step (The Overcharge release voltage selected within range where difference from Overcharge detection voltage Overdischarge detection voltage Overdischarge release voltage 1.70 2.60 step 1.70 3.80 step (The Overdischarge release voltage selected within range where difference from Overdischarge detection voltage Overcurrent detection voltage 0.07 0.30 mV-step High input-voltage device (absolute maximum rating: Wide operating voltage range: delay time every detection external capacitor. Each delay time Overcharge detection, Overdischarge detection, Overcurrent detection "Proportion hundred 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 Power-down mode typ. 14.2 (-40 typ. (-40
TSSOP package (8-pin)
Applications
Lithium-ion rechargeable battery packs
Package
8-PinTSSOP (PKG code:FT008-A)
Seiko Instruments Inc.
Battery Protection (for 2-serial-cell pack) S-8232 Series
Rev. 4.1_00
Selection Guide .Nov ,2001)
Table1
Model/Item Overcharge detection voltage1,2 (VCU1,2) 4.25V±25mV 4.35V±25mV 4.35V±25mV 4.35V±25mV 4.25V±25mV 4.25V±25mV 4.25V±25mV 4.325V±25mV 4.25V±25mV 4.20V±25mV 4.30V±25mV 4.19V±25mV 4.325V±25mV 4.30V±25mV 4.28V±25mV 4.325V±25mV 4.295V±25mV 4.125V±25mV 4.30V±25mV 4.30V±25mV 4.35V±25mV 4.325V±25mV 4.30V±25mV 4.30V±25mV 4.325V±25mV 4.275 V±25 4.35 V±25 Overdischarge Overcharge detection release voltage1,2 voltage1,2 (VCD1,2) (VDD1,2) 4.05±50mV 4.15±50mV 4.15±50mV 4.28±50mV 4.05±50mV 4.05±50mV 4.05±50mV 4.325V±25mV 4.05±50mV 4.00±50mV 4.05±50mV 4.19 V±25mV 4.325V±25mV 4.05±50mV 4.05±50mV 4.325V±25mV 1),3) 4.20±50mV 4.125±25mV 4.10±50mV 4.05V±50mV 4.15V±50mV 4.200V±50mV 4.05V±50mV 4.05V±50mV 4.325V±25mV 4.05 V±50 4.15 V±50
1),3) 1),2)
Overdischarge release voltage1,2 (VDU1,2) 3.00V±100mV 3.00V±100mV 3.00V±100mV 2.80V±100mV 2.70V±100mV 2.40V±100mV 2.40V±100mV 3.00V±100mV 3.00V±100mV 2.90V±100mV 3.00V±100mV 3.00V±100mV 3.00V±100mV 3.00V±100mV 2.90V±100mV 2.50V±100mV 3.00V±100mV 3.00V±100mV 3.00V±100mV 3.00V±100mV 3.00V±100mV 3.00V±100mV 2.00V±80mV 2.30V±80mV 3.00V±100mV
Overcurrent detection voltage1 (VIOV1) 0.150V±20mV 0.300V±20mV 0.300V±20mV 0.100V±20mV 0.300V±20mV 0.200V±20mV 0.300V±20mV 0.300V±20mV 0.150V±20mV 0.200V±20mV 0.200V±20mV 0.190V±20mV 0.300V±20mV 0.230V±20mV 0.100V±20mV 0.300V±20mV 0.300V±20mV 0.190V±20mV 0.200V±20mV 0.300V±20mV 0.150V±20mV 0.20V±20mV 0.20V±20mV 0.20V±20mV 0.15V±20mV
Overcharge battery detection delay charging time (tCU) function C3=0.22 Available Available Unavailable Available Available Available Available Unavailable Unavailable Available Available Available Unavailable Available Unavailable Unavailable Unavailable Available Unavailable Available Unavailable Unavailable Available Available Unavailable Unavailable Available
S-8232AAFT S-8232ABFT S-8232ACFT S-8232AEFT S-8232AFFT S-8232AGFT S-8232AHFT S-8232AIFT S-8232AJFT S-8232AKFT S-8232ALFT S-8232AMFT S-8232ANFT S-8232AOFT S-8232APFT S-8232ARFT S-8232ASFT
2.40V±80mV 2.30V±80mV 2.30V±80mV 2.15V±80mV 2.30V±80mV 2.20V±80mV 2.20V±80mV 2.40V±80mV 2.40V±80mV 2.30V±80mV 2.00V±80mV 2.00V±80mV 2.40V±80mV 2.00V±80mV 2.30V±80mV 2.00V±80mV 2.30V±80mV 2.00V±80mV 2.40V±80mV 2.00V±80mV 2.30V±80mV 2.30V±80mV 2.00V±80mV 2.30V±80mV 2.40V±80mV
S-8232ATFT S-8232AUFT S-8232AVFT S-8232AWFT S-8232AXFT S-8232AYFT S-8232AZFT S-8232NAFT S-8232NCFT S-8232NDFT
2.20 V±80 3.00 V±100 0.20 V±20 2.30 V±80 2.30 V±80 0.15 V±20
overcharge detection/release hysteresis magnification final overcharge 1.11; other 1.25. final overcharging function Refer Description Operation (*3).
Change detection voltage available. Please contact sales office.
overdischarge detection voltage selected within range from When overdischarge detection voltage higher than overcharge detection voltage overcharge release voltage limited table
Overdischarge detection voltage1,2 (VDD1,2) 1.70 2.60 1.70 2.80 1.70 3.00 Table Overcharge detection Voltage difference between overcharge detection voltage voltage1,2 (VCU1,2) overcharge release voltage (VCU1,2 VCD1,2) 3.90 4.60 3.90 4.60 3.90 4.50 0.30 0.20 0.10
Seiko Instruments Inc.
Rev. 4.1_00 Block Diagram
Battery Protection (for 2-serial-cell pack) S-8232 Series
Reference voltage
SENS
Auxiliary Over charge detector
Over charge detector
Control Logic
Delay circuit control signal
Over discharge detector
Over discharge detector RCOL
Over charge detector
Over current detection circuit Delay circuit control signal Delay circuit control signal Delay circuit control signal Delay circuit DO,CO control signal
Auxiliary Over charge Reference detector voltage
Figure
Output impedance when terminal output higher than terminal. RCOL resistor connected with terminal. Please refer `Electric Characteristics'.
Seiko Instruments Inc.
Battery Protection (for 2-serial-cell pack) S-8232 Series
Rev. 4.1_00
Assignment
View
TSSOP-8 Figure
Description
Table
Name SENS Description Detection voltage between SENS (Detection overcharge overdischarge) gate connection discharge control (CMOS output) gate connection charge control (CMOS output) Detection voltage between (Overcurrent detection pin) Negative power input Capacitor connection detection delay Middle voltage input Positive power input
Absolute Maximum Ratings
Table
Item Input voltage between SENS Input terminal voltage Input terminal voltage Input terminal voltage output terminal voltage output terminal voltage Power dissipation Operating temperature range Storage temperature range Symbol VSENS VICT Topr Tstg Applied Pins SENS Rating VSS-0.3 VSS+18 VSS-0.3 VCC+0.3 VSS-0.3 VCC+0.3 VCC-18 VCC+0.3 VSS-0.3 VCC+0.3 VVM-0.3 VCC+0.3 +125
25°C
Unit
Seiko Instruments Inc.
Rev. 4.1_00
Battery Protection (for 2-serial-cell pack) S-8232 Series
Electrical Characteristics
Table
Item Detection voltage Overcharge detection voltage
Symbol Condition Circuit
Unless otherwise noted, 25°C
Notice Min. VCU1,2 -0.025 VCU1,2 Typ. VCU1,2 VCU1,2 VCU1,2 VCD1,2 VDD1,2 VDU1,2 VIOV1 -1.20 -0.05 Max. VCU1,2 +0.025 VCU1,2 VCU1,2 VCD1,2 +0.050 VDD1,2 +0.080 VDU1,2 +0.100 VIOV1+0.020 -0.83 Unit
VCU1,2
Auxiliary overcharge detection VCUaux1,2 voltage VCUaux1,2 VCUaux1,2 VCUaux1,2 Overcharge release voltage VCD1,2 Overdischarge detection voltage Overdischarge release voltage Overcurrent detection voltage Overcurrent detection voltage Temperature coefficient detection voltage Temperature coefficient detection voltage Delay time (C3=0.22 Overcharge detection delay time1,2 Overdischarge detection delay time Overcurrent detection delay time1 Input voltage Input voltage between Operating voltage Operating voltage between Current consumption Current consumption during normal operation Current consumption power down Output voltage DO"H"voltage DO"L"voltage CO"H"voltage internal resistance Resistance between Internal resistance Resistance between Resistance between battery charging function charge starting voltage charge inhibiting voltage VDD1,2 VDU1,2 VIOV1 VIOV2 TCOE1 TCOE2
Between 3.90 4.60
VCU1,2 Between 3.60 VCD1,2 4.60 -0.050 Between 1.70 VDD1,2 2.60 -0.080 Between 1.70 VDU1,2 3.80 -0.100 Between 0.07 0.30 VIOV1-0.020 Reference -1.57 Ta=-40 85°C -0.6 Ta=-40 85°C -0.24
mV/°C mV/°C
tCU1,2 tDD1,2 tIOV1
0.01 Absolute maximum rating
0.73 -0.3
1.00
1.35 13.9
VDSOP
IOPE IPDN
V1=V2=3.6 V1=V2=1.5
0.0002
12.7 0.04
VDO(H) VDO(L) VCO(H) RCOL Rvcm Rvsm V0CHA V0INH1,2
12,13
Iout=10 Iout=10 Iout=10 VCO-VSS=9.4 Vcc-VVM=0.5 VVM-VSS=1.1 battery charging Available battery charging Unavailable
VCC-0.05 VCC-0.15 0.29 0.38 0.32
VCC-0.003 VSS+0.003 VCC-0.019 0.75 0.88
VSS+0.05 1.44 1.12 1.44
Temperature coefficient detection voltage should applied overcharge detection voltage, overcharge release voltage, overdischarge detection voltage, overdischarge release voltage. Temperature coefficient detection voltage should applied overcurrent detection voltage. logic established operating voltage. Auxiliary overcharge detection voltage equal overcharge detection voltage times 1.11 products without overcharge hysteresis, times 1.25 other products.
Seiko Instruments Inc.
Battery Protection (for 2-serial-cell pack) S-8232 Series
Rev. 4.1_00
Unless otherwise noted, +70°C
Notice Between 3.90 4.60 Min. VCU1,2 -0.045 VCU1,2 VCU1,2 VCD1,2 -0.070 VDD1,2 -0.100 VDU1,2 -0.120 VIOV1-0.029 -1.66 -0.6 -0.24 Typ. VCU1,2 VCU1,2 VCU1,2 VCD1,2 VDD1,2 VDU1,2 VIOV1 -1.20 -0.05 Max. VCU1,2 +0.040 VCU1,2 VCU1,2 VCD1,2 +0.065 VDD1,2 +0.095 VDU1,2 +0.115 VIOV1+0.029 -0.74 Unit
Table
Item Detection voltage Overcharge detection voltage
Symbol Condition Circuit
VCU1,2
Auxiliary overcharge detection VCUaux1,2 voltage VCUaux1,2 VCUaux1,2 VCUaux1,2 Overcharge release voltage VCD1,2 Overdischarge detection voltage Overdischarge release voltage Overcurrent detection voltage Overcurrent detection voltage Temperature coefficient detection voltage Temperature coefficient detection voltage Delay time (C3=0.22 Overcharge detection delay time1,2 Overdischarge detection delay time Overcurrent detection delay time1 Input voltage Input voltage between Operating voltage Operating voltage between Current consumption Current consumption during normal operation Current consumption power down Output voltage DO"H"voltage DO"L"voltage CO"H"voltage internal resistance Resistance between Internal resistance Resistance between Resistance between battery charging function charge starting voltage charge inhibiting voltage VDD1,2 VDU1,2 VIOV1 VIOV2 TCOE1 TCOE2
Between 3.60 4.60 Between 1.70 2.60 Between 1.70 3.80 Between 0.07 0.30 Reference Ta=-40 85°C Ta=-40 85°C
mV/°C mV/°C
tCU1,2 tDD1,2 tIOV1
0.01 Absolute maximum rating
0.60 -0.3
1.00
1.84 14.5
VDSOP
IOPE IPDN
V1=V2=3.6 V1=V2=1.5
0.0002
13.8 0.06
VDO(H) VDO(L) VCO(H) RCOL Rvcm Rvsm V0CHA V0INH1,2
12,13
Iout=10 Iout=10 Iout=10 VCO-VSS=9.4 VCC-VVM=0.5 VVM-VSS=1.1 battery charging Available battery charging Unavailable
VCC-0.14 VCC-0.24 0.24 0.29 0.23
VCC-0.003 VSS+0.003 VCC-0.019 0.75 0.88
VSS+0.14 1.96 1332 1.21 1.53
Temperature coefficient detection voltage should applied overcharge detection voltage, overcharge release voltage, overdischarge detection voltage, overdischarge release voltage. Temperature coefficient detection voltage should applied overcurrent detection voltage. logic established operating voltage. Auxiliary overcharge detection voltage equal overcharge detection voltage times 1.11 products without overcharge hysteresis, times 1.25 other products.
Seiko Instruments Inc.
Rev. 4.1_00
Battery Protection (for 2-serial-cell pack) S-8232 Series
Table
Item Detection voltage Overcharge detection voltage
Symbol Condition Circuit
Unless otherwise noted, +85°C
Notice Min. VCU1,2 -0.055 VCU1,2 VCU1,2 VCD1,2 -0.080 VDD1,2 -0.110 VDU1,2 -0.130 VIOV1-0.033 -1.70 -0.6 -0.24 Typ. VCU1,2 VCU1,2 VCU1,2 VCD1,2 VDD1,2 VDU1,2 VIOV1 -1.20 -0.05 Max. VCU1,2 +0.045 VCU1,2 VCU1,2 VCD1,2 +0.070 VDD1,2 +0.100 VDU1,2 +0.120 VIOV1+0.033 -0.71 Unit
VCU1,2
Auxiliary overcharge detection VCUaux1,2 voltage VCUaux1,2 VCUaux1,2 VCUaux1,2 Overcharge release voltage VCD1,2 Overdischarge detection voltage Overdischarge release voltage Overcurrent detection voltage Overcurrent detection voltage Temperature coefficient detection voltage Temperature coefficient detection voltage Delay time (C3=0.22 Overcharge detection delay time1,2 Overdischarge detection delay time Overcurrent detection delay time1 Input voltage Input voltage between Operating voltage Operating voltage between Current consumption Current consumption during normal operation Current consumption power down Output voltage DO"H"voltage DO"L"voltage CO"H"voltage internal resistance Resistance between Internal resistance Resistance between Resistance between battery charging function charge starting voltage charge inhibiting voltage VDD1,2 VDU1,2 VIOV1 VIOV2 TCOE1 TCOE2
Between 3.90 4.60
Between 3.60 4.60 Between 1.70 2.60 Between 1.70 3.80 Between 0.07 0.30 Reference Ta=-40 85°C Ta=-40 85°C
mV/°C mV/°C
tCU1,2 tDD1,2 tIOV1
0.01 Absolute maximum rating
0.55 -0.3
1.00
2.06 14.7
VDSOP
IOPE IPDN
V1=V2=3.6 V1=V2=1.5
0.0002
14.2 0.10
VDO(H) VDO(L) VCO(H) RCOL Rvcm Rvsm V0CHA V0INH1,2
12,13
Iout=10 Iout=10 Iout=10 VCO-VSS=9.4 Vcc-VVM=0.5 VVM-VSS=1.1 battery charging Available battery charging Unavailable
VCC-0.17 VCC-0.27 0.22 0.26 0.20
VCC-0.003 VSS+0.003 VCC-0.019 0.75 0.88
VSS+0.17 2.20 1491 1.25 1.57
Temperature coefficient detection voltage should applied overcharge detection voltage, overcharge release voltage, overdischarge detection voltage, overdischarge release voltage. Temperature coefficient detection voltage should applied overcurrent detection voltage. logic established operating voltage. Auxiliary overcharge detection voltage equal overcharge detection voltage times 1.11 products without overcharge hysteresis, times 1.25 other products.
Seiko Instruments Inc.
Battery Protection (for 2-serial-cell pack) S-8232 Series Measurement Circuits
Measurement Measurement circuit
Rev. 4.1_00
S1=OFF, V1=V2=3.6 V3=0 under normal condition. Increase from gradually. voltage when overcharge detection voltage (VCU1). Decrease gradually. voltage when overcharge release voltage (VCD1). Further decrease voltage when overdischarge voltage (VDD1). Increase gradually. voltage when overdischarge release voltage (VDU1). S1=ON, V1=V2=3.6 V3=0 under normal condition. Increase from gradually. voltage when auxiliary overcharge detection voltage (VCUaux1). Measurement Measurement circuit S1=OFF,V1=V2=3.6 ,and V3=0 under normal condition. Increase from gradually. voltage when overcharge detection voltage (VCU2). Decrease gradually. voltage when overcharge release voltage (VCD2). Further decrease voltage when overdischarge voltage (VDD2). Increase gradually. voltage when overdischarge release voltage (VDU2). S1=ON,and V1=V2=3.6 V3=0 under normal condition. Increase from gradually. voltage when auxiliary overcharge detection voltage (VCUaux2). Measurement Measurement circuit S1=OFF,V1=V2=3.6 V3=0 under normal condition. Increase from gradually. voltage when overcurrent detection voltage (VIOV1). S1=ON,V1=V2=3.6 V,V3=0 under normal condition. Increase from gradually.(The voltage change rate 1.0V/ms) (V1+V2-V3) voltage when overcurrent detection voltage (VIOV2). Measurement Measurement circuit S1=ON, V1=V2=3.6 V3=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=V2=V3=1.5 V3=2.5 under overdischarge condition. (V1+V2-V3)/I2 internal resistance between (Rvcm). S1=ON, V1=V2=3.5 V3=1.1 under overcurrent condition. V3/I2 internal resistance between (Rvsm). Measurement Measurement circuit S1=ON, S2=OFF, V1=V2=3.6 V3=0 under normal condition. Increase from gradually. voltage when DO'H' voltage (VD0 (H)). S1=OFF, S2=ON, V1=V2=3.6 V3=0.5 under overcurrent condition. Increase from gradually. voltage when DO'L' voltage (VDO (L)). Measurement Measurement circuit S1=ON, S2=OFF, V1=V2=3.6 V3=0 under normal condition. Increase from gradually. voltage when CO'H' voltage (VC0 (H)). S1=OFF S2=ON, V1=V2=4.7, V3=0 V4=9.4 under over voltage condition. (V5)/I2 internal resistance (RCOL). Measurement Measurement circuit V1=V2=3.6 V3=0 under normal condition. Increase from (VCU1-0.2 (VCU1+0.2 immediately (within µs). time after becomes (VCU1+0.2 until goes overcharge detection delay time (tCU1).
Seiko Instruments Inc.
Rev. 4.1_00
Battery Protection (for 2-serial-cell pack) S-8232 Series
V1=V2=3.5 V3=0 under normal condition. Decrease from (VDD1+0.2 (VDD1-0.2 immediately (within µs). time after becomes (VDD1-0.2 until goes overdischarge detection delay time (tDD1). Measurement Measurement circuit V1=V2=3.6 V3=0 under normal condition. Increase from (VCU2-0.2 (VCU2+0.2 immediately (within µs). time after becomes (VCU2+0.2 until goes overcharge detection delay time (tCU2). V1=V2=3.6 V3=0 under normal condition. Decrease from (VDD2+0.2 (VDD2-0.2 immediately (within µs). time after becomes (VDD2-0.2 until goes overdischarge detection delay time (tDD2). (10) Measurement Measurement circuit V1=V2=3.6 V3=0 under normal condition. Increase from immediately (within µs). time after becomes until goes overcurrent detection delay time (tI0V1). (11) Measurement Measurement circuit V1=V2=0 V3=2 decrease gradually. voltage when (VCC- lower) charge starting voltage (V0CHA). (12) Measurement Measurement circuit V1=0 V2=3.6 V3=12 increase gradually. voltage when (VVM higher) charge inhibiting voltage (V0INH1). (13) Measurement Measurement circuit V1=3.6 V2=0 V3=12 increase gradually. voltage when (VVM higher) charge inhibiting voltage (V0INH2).
SENS S-8232Series
SENS S-8232Series
Measurement circuit
Measurement circuit
SENS
SENS
S-8232Series
S-8232Series
Measurement circuit
Measurement circuit
Seiko Instruments Inc.
Battery Protection (for 2-serial-cell pack) S-8232 Series
Rev. 4.1_00
SENS
C3=0.22µF
SENS S-8232Series 4.7M
S-8232Series
Measurement circuit
Measurement circuit
Description Operation
Normal condition
(1),
This monitors voltages serially connected batteries discharge current control charging discharging. When voltages batteries range from overdischarge detection voltage (VDD1,2) overcharge detection voltage (VCU1,2), current flowing through batteries becomes equal lower than specified value (the terminal voltage equal lower than overcurrent detection voltage charging discharging FETs turned this condition, charging discharging carried freely. This condition called normal condition. this condition, terminals shorted Rvsm resistor. Overcurrent condition When 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 (tIOV) longer, discharging turned stop discharging. This condition called overcurrent condition. terminals shorted Rvsm resistor this time. charging also turned off. When discharging load connected, terminal voltage equals potential. overcurrent condition returns normal condition when load released impedance between terminals (see Figure connection example) higher. When load released, terminal, which shorted terminal with Rvsm resistor, goes back potential. detects that terminal potential returns overcurrent detection voltage (VIOV1) lower returns normal condition. Overcharge condition Following cases detected overcharge conditions: battery voltages becomes higher than overcharge detection voltage (VCU1,2) during charging under normal condition continues overcharge detection delay time (tCU1,2) longer, charging turns stop charging. battery voltages becomes higher than auxiliary overcharge detection voltage (VCUaux1,2) charging turns immediately stop charging. terminals shorted Rvsm resistor under overcharge condition. auxiliary overcharge detection voltages (VCUaux1,2) correlated with overcharge detection voltages (VCU1,2) defined following equations: VCUaux1,2 overcharge hysteresis type (VCU1,2 VCD1,2) VCUaux1,2
Seiko Instruments Inc.
Rev. 4.1_00
Battery Protection (for 2-serial-cell pack) S-8232 Series
overcharge condition released cases: battery voltage which exceeded overcharge detection voltage (VCU1,2) falls below overcharge release voltage (VCD1,2), charging turns normal condition returns. battery voltage which exceeded overcharge detection voltage (VCU1,2) equal higher than overcharge release voltage (VCD1,2), charger removed, load placed, discharging starts, charging turns normal condition returns. release mechanism follows: discharge current flows through internal parasitic diode charging immediately after load installed discharging starts, terminal voltage decreases about from terminal voltage momentarily. detects this voltage (overcurrent detection voltage higher), releases overcharge condition returns normal condition. Overdischarge condition battery voltages falls below overdischarge detection voltage (VDD1,2) during discharging under normal condition continues overdischarge detection delay time (tDD1,2) 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 overcurrent detection voltage higher. When battery voltages becomes equal higher than overdischarge release voltage (VDU1,2) this condition, overdischarge condition changes normal condition. Delay circuits overcharge detection delay time (tCU1,2), overdischarge detection delay time (tDD1,2), overcurrent detection delay time (tI0V1) change with external capacitor (C3). Since capacitor determine each delay time, delay times correlated following ratio: Overcharge delay time Overdischarge delay time: Overcurrent delay time delay times calculated following equations: (Ta=-40 +85°C) Overcharge detection delay time Min., tCU[s] =Delay factor 2.500, Overdischarge detection delay time tDD[s] =Delay factor 0.3045, Overcurrent detection delay time Typ., 4.545, 0.4545, Max. 9.364 [µF] 0.6409 [µF]
tIOV1[s]=Delay factor 0.02864, 0.04545, 0.06682 [µF] Note: delay time overcurrent detection fixed internal circuit. delay time cannot changed external capacitor. battery charging function This function used recharge both serially-connected batteries after they 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 (VDU1,2), normal condition returns.
Seiko Instruments Inc.
Battery Protection (for 2-serial-cell pack) S-8232 Series
Rev. 4.1_00
battery charge inhibiting function This function used inhibiting charging when either connected batteries goes selfdischarge. When voltage either connected batteries goes below charge inhibit voltage (VOINH1, charging gate fixed inhibit charging. Charging possible only when voltage both connected batteries goes charge inhibit voltage (VOINH1, more. Note that charging possible when total voltage both connected batteries less than minimum value (VDSOPmin) operating voltage between VCC-VSS even voltage either connected batteries charge inhibit voltage (V0INH1, less. Charging prohibited when total voltage both connected batteries reaches minimum value (VDSOPmin) operating voltage between VCC-VSS. When using this optional function, resistor needed between gate source charging control (refer Figure When initially connecting batteries, fail enter normal condition (discharging ready state). once voltage (short pins connect charger). Some lithium batteries recommended recharged after having been completely discharged. Please contact battery manufacturer when decide select battery charging function. products indicated with Selection Guide (model name/item) "overcharge detection/release hysteresis," final overcharge function," battery charge inhibiting function." following phenomena found, there problem practical use. product overcurrent condition overload connection when battery voltage overcharge release voltage (VCD1, more overcharge detection voltage (VCU1, less. Usually, returns normal condition when overload removed under this condition. However, charging turned when overload removed under this condition, leading overcharge condition. attach load start discharge. charging turned return normal condition. Refer "Overcharge condition" description Section.
Seiko Instruments Inc.
Rev. 4.1_00
Battery Protection (for 2-serial-cell pack) S-8232 Series
Operation Timing Charts
Overcharge detection
Vcuaux
battery
battery
Battery voltage
terminal
auxiliary Over voltage detect Over voltage detect over voltage detect
auxiliary over voltage detect
terminal
EBVcc
terminal
Viov2 Viov1
Charger connected Load connected
Mode
Delay
Delay
Note:
Normal mode,
Over charge mode, Over discharge mode,
over current mode
charger assumed charge with constant current.
Figure
Overdischarge detection
battery
battery
Battery voltage
terminal
terminal
EBVcc
terminal
Viov2 Viov1
Charger connected Load connecte
Mode
Delay
Delay
Delay
Note:
Normal mode,
Over charge mode,
Over discharge mode,
over current mode
charger assumed charge with constant current.
Figure
Seiko Instruments Inc.
Battery Protection (for 2-serial-cell pack) S-8232 Series
Overcurrent detection
Rev. 4.1_00
V1,V2 battery
Battery voltage
terminal
terminal
EBVcc Viov2
terminal
Viov1
Charger connected Load connected
Mode
Delay tIOV1
Delay tIOV2
tIOV1
Note:
Normal mode,
Over charge mode,
Over discharge mode,
over current mode
charger assumed charge with constant current.
Figure
Seiko Instruments Inc.
Rev. 4.1_00
Battery Protection (for 2-serial-cell pack) S-8232 Series
Battery Protection Connection Example
Battery 0.22 Battery 0.22 0.22 FET1 FET2 Delay time setting SENS
S-8232 series
Figure
Table Constant
Symbol FET1 FET2 Parts MOSFET MOSFET Chip resistor Chip capacitor Chip resistor Chip capacitor Chip resistor Chip capacitor Chip resistor Chip resistor Purpose Charge control Discharge control protection Filter protection Filter protection Delay time setting Protection charger reverse connection battery charging inhibition Recommended 0.22 0.22 0.22 (4.7 min. -300 min. max. max. Same value (10M) Attention should paid leak current Discharge can't stopped less than when charger reverse-connected. should added when product battery charge inhibition. Lower resistance increases current consumption. Remarks
required. Overcharge detection voltage increases example (R4) increases overcharge detection voltage overcharge detection delay time (tCU), overdischarge detection delay time (tCD), over current detection delay time (tIOV) change with external capacitor electrical characteristics. When resistor less than charger reverse-connected, current which exceeds power dissipation package will flow break. excessive causes increase overcurrent detection voltage (VIOV1). VIOV1 changes example resistor (R3) increases overcurrent detection voltage (VIOV1) from 0.100 0.113 resistor needed inhibit battery charging. Current consumption increases when resistance increases. should connected when product battery charging inhibition. Note: above connection diagram constants guarantee proper operations. Evaluate your actual application constants properly.
Seiko Instruments Inc.
Battery Protection (for 2-serial-cell pack) S-8232 Series Precautions
Rev. 4.1_00
After overcurrent detection delay, battery voltages equals overdischarge detection voltage (VDD1,2) lower, overdischarge detection delay time becomes shorter than 10ms (min.). occurs because capacitor sets delay times. (Refer fig.7) Cause occurs because capacitor sets delay times. When overcurrent detection released until tIOV1 capacitor charged S8232. battery voltage lower than VDD1,2 that time, charging goes delay time shorter then typical. Conclusion This phenomenon occurs when battery voltage nearly equal overdischarge voltage (VDD1,2) after overcurrent detected. means that battery capacity small those must charged future. Even state changes overdischarge condition, battery package capacity same typical. When battery voltages overdischarge detection voltage(VDD1,2) lower other becomes higher than overcharge detection voltage(VCU1,2), detects overcharge without overcharge detection delay time(tCU). (Refer fig.8) Cause same overdischarge detection under overcurrent condition. occurs because capacitor sets delay times. Conclusion This phenomenon occurs when battery voltage lower than overdischarge voltage (VDD1,2) batteries charged charger. Under this situation voltage difference between batteries unusual. Without delay time better than long delay time battery pack safety.(Refer fig.8)
terminal Battery voltage
Battery voltage
battery voltages equal less over discharge voltage.
terminal
over discharge detection
terminal
Viov2 Viov1
over current returns normal current.
Load connect
over current delay over discharge delay
delay time becomes shorter than usual.
Figure
Battery voltage
Over voltage detect
Over discharge state
Delay time Charger connected
Figure
After overcurrent detection, load connected long time, even battery voltage became lower than overdischarge detection voltage (VDD1,2), can't detects overdischarge long load connected. Therefor IC's current consumption battery voltage lower than overdischarge detection voltage same normal condition current consumption (IOPE) (Refer fig.9)
Seiko Instruments Inc.
Rev. 4.1_00
Cause reason follows. overcurrent detection overdischarge detection occur same time, overcurrent detection takes precedence overdischarge detection. long detects overcurrent, can't detect overdischarge. Conclusion load taken least time, overcurrent released overdischarge detection works. Unless keeping IC(S-8232) with load long time, reduction battery voltage will neglected, because IC's(S-8232) current consumption(typ. small.
Battery Protection (for 2-serial-cell pack) S-8232 Series
Battery voltage
battery voltages less than over discharge voltage, self current consumption.
long load connected, IC's current consumption same normal current consumption (Iope).
Current
Iope
Consumption Ipdn
terminal
Viov2 Viov1 EBLoad connect
terminal
over current delay
Figure
apply electrostatic discharge this that exceeds performance ratings built-in electrostatic protection circuit.
Seiko Instruments Inc.
Battery Protection (for 2-serial-cell pack) S-8232 Series
Rev. 4.1_00
Characteristics(typical characteristics)
Detection voltage temperature characteristics
Overcharge detection voltage1 temperature
Overcharge detection voltage2 temperature
VCU1=4.30
VCU2=4.30
VCU1
VCU2
Ta(°C)
Ta(°C)
Overcharge release voltage1 temperature
Overcharge release voltage2 temperature
VCD1=4.00
VCD2=4.00
VCD1
VCD2
Ta(°C)
Ta(°C)
Auxiliary overcharge detection voltage1 temperature
5.45
Auxiliary overcharge detection voltage2 temperature
5.45
VCUaux1=5.375[V]
VCUaux2=5.375[V]
VCUaux1
5.35
VCUaux2
5.35
5.25
5.25
Ta(°C)
Ta(°C)
Seiko Instruments Inc.
Rev. 4.1_00
Overdischarge detection voltage1 temperature
Battery Protection (for 2-serial-cell pack) S-8232 Series
Overdischarge detection voltage2 temperature
VDD1=2.00
VDD2=2.00
VDD1
VDD2
Ta(°C)
Ta(°C)
Overdischarge release voltage1 temperature
Overdischarge release voltage1 temperature
VDU1=2.60
VDU2=2.60
VDU1
VDU2
Ta(°C)
Ta(°C)
Overcurrent1 detection voltage temperature
0.12
Overcurrent1 detection voltage temperature VIOV2=1.20 (VCC reference)
VIOV1=0.1
-1.10 -1.15
VIOV1
0.10
VIOV2
-1.20 -1.25 -1.30
0.08
Ta(°C)
Ta(°C)
Seiko Instruments Inc.
Battery Protection (for 2-serial-cell pack) S-8232 Series
Rev. 4.1_00
2.Current consumption temperature characteristics
Current consumption temperature normal mode
Current consumption temperature power-down mode VCC=3.0
VCC=7.2
IOPE (uA)
IPDN (nA)
Ta(°C)
Ta(°C)
Delay time temperature characteristics
Overcharge detection1 time temperature C3=0.22 [uF]
Overcharge detection1 time temperature C3=0.22 [uF]
(ms)
Ta(°C)
Ta(°C)
Overcurrent1 detection time temperature
C3=0.22 [uF]
tIOV1 (ms)
Ta(°C)
Seiko Instruments Inc.
3.00 -0.2
+0.3
0.17±0.05
0.2±0.1 0.65
FT008-A-P-SD-1.1
TITLE SCALE UNIT
TSSOP8-A-PKG Dimensions FT008-A-P-SD-1.1
Seiko Instruments Inc.
4.0±0.1(50 pitches:200.0±0.3) 2.0±0.05 1.55±0.05 0.3±0.05
1.4±0.1 8.0±0.1 (6.9) max. 1.55 +0.1
-0.2
+0.4
FT008-A-C-SD-3.1
Feed direction
TITLE SCALE UNIT
TSSOP8-A-Carrier Tape FT008-A-C-SD-3.1
Seiko Instruments Inc.
Enlarged drawing central part 2±0.5
13.4±1.0 17.5±1.0
FT008-A-R-SD-3.1
TITLE SCALE UNIT
TSSOP8-A-Reel FT008-A-R-SD-3.1
QTY. 3,000
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.

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