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 highaccuracy 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 Seiko Instruments Inc. Reel FT008-E 1 BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK S-8232 Series Rev.5.4_00 Block Diagram VCC SENS Reference voltage 1 Auxiliary overcharge detector 1 − + − + − + Overcharge detector 1 Overdischarge detector 1 DO Delay circuit control signal Control logic VC + − + − RCOL Overcharge detector 2 Over current detection circuit Delay circuit control signal + − VSS CO Overdischarge detector 2 Auxiliary overcharge Reference detector 2 voltage 2 Delay circuit control signal VM Delay circuit control signal Delay circuit ICT DO, CO control signal 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 Rev.5.4_00 Product Name Structure 1. Product Name S-8232 xx FT - T2 - G IC direction in tape specifications *1 Package code FT : 8-Pin TSSOP Serial code Sequentially set from AA to ZZ *1. Refer to the taping specifications. 2. Product Name List Table 1 (1 / 2) Overcharge detection voltage 1, 2 VCU Overcharge release voltage 1, 2 VCD Overdischarge detection voltage 1, 2 VDD S-8232AAFT-T2-G 4.25 V ± 25 mV 4.05 V ± 50 mV 2.40 V ± 80 mV Overcharge detection 0 V battery delay time charging tCU function (C3 = 0.22 µF) 3.00 V ± 100 mV 0.150 V ± 20 mV 1.0 s Available S-8232ABFT-T2-G 4.35 V ± 25 mV 4.15 V ± 50 mV 2.30 V ± 80 mV 3.00 V ± 100 mV 0.300 V ± 20 mV 1.0 s Available S-8232ACFT-T2-G 4.35 V ± 25 mV 4.15 V ± 50 mV 2.30 V ± 80 mV 3.00 V ± 100 mV 0.300 V ± 20 mV 1.0 s Unavailable S-8232AEFT-T2-G 4.35 V ± 25 mV 4.28 V ± 50 mV 2.15 V ± 80 mV 2.80 V ± 100 mV 0.100 V ± 20 mV 1.0 s Available S-8232AFFT-T2-G 4.25 V ± 25 mV 4.05 V ± 50 mV 2.30 V ± 80 mV 2.70 V ± 100 mV 0.300 V ± 20 mV 1.0 s Available S-8232AGFT-T2-G 4.25 V ± 25 mV 4.05 V ± 50 mV 2.20 V ± 80 mV 2.40 V ± 100 mV 0.200 V ± 20 mV 1.0 s Available 4.25 V ± 25 mV 4.05 V ± 50 mV 2.20 V ± 80 mV 2.40 V ± 100 mV 0.300 V ± 20 mV 1.0 s Available Product name / Item S-8232AHFT-T2-G *1 *2 Overdischarge release voltage1, 2 VDU Overcurrent detection voltage 1 VIOV1 S-8232AIFT-T2-G 4.325 V ± 25 mV 4.325 V ± 25 mV 2.40 V ± 80 mV 3.00 V ± 100 mV 0.300 V ± 20 mV 1.0 s Unavailable S-8232AJFT-T2-G 4.25 V ± 25 mV 4.05 V ± 50 mV 2.40 V ± 80 mV 3.00 V ± 100 mV 0.150 V ± 20 mV 1.0 s Unavailable S-8232AKFT-T2-G 4.20 V ± 25 mV 4.00 V ± 50 mV 2.30 V ± 80 mV 2.90 V ± 100 mV 0.200 V ± 20 mV 1.0 s Available S-8232ALFT-T2-G 4.30 V ± 25 mV 4.05 V ± 50 mV 2.00 V ± 80 mV 3.00 V ± 100 mV 0.200 V ± 20 mV 1.0 s Available S-8232AMFT-T2-G 4.19 V ± 25 mV 4.19 V ± 25 mV *1 2.00 V ± 80 mV 3.00 V ± 100 mV 0.190 V ± 20 mV 1.0 s Available *1 *3 S-8232ANFT-T2-G 4.325 V ± 25 mV 4.325 V ± 25 mV 2.40 V ± 80 mV 3.00 V ± 100 mV 0.300 V ± 20 mV 1.0 s Unavailable S-8232AOFT-T2-G 4.30 V ± 25 mV 4.05 V ± 50 mV 2.00 V ± 80 mV 3.00 V ± 100 mV 0.230 V ± 20 mV 1.0 s Available 4.28 V ± 25 mV 4.05 V ± 50 mV 2.30 V ± 80 mV 2.90 V ± 100 mV 0.100 V ± 20 mV 1.0 s Unavailable *1 *3 S-8232ARFT-T2-G 4.325 V ± 25 mV 4.325 V ± 25 mV 2.00 V ± 80 mV 2.50 V ± 100 mV 0.300 V ± 20 mV 1.0 s Unavailable S-8232ASFT-T2-G*4 4.295 V ± 25 mV 2.30 V ± 80 mV 3.00 V ± 100 mV 0.300 V ± 20 mV 1.0 s Unavailable S-8232APFT-T2-G 4.20 V ± 50 mV *3 S-8232ATFT-T2-G 4.125 V ± 25 mV 4.125 V ± 25 mV *1 2.00 V ± 80 mV 3.00 V ± 100 mV 0.190 V ± 20 mV 1.0 s Available S-8232AUFT-T2-G 4.30 V ± 25 mV 4.10 V ± 50 mV 2.40 V ± 80 mV 3.00 V ± 100 mV 0.200 V ± 20 mV 1.0 s Unavailable S-8232AVFT-T2-G 4.30 V ± 25 mV 4.05 V ± 50 mV 2.00 V ± 80 mV 3.00 V ± 100 mV 0.300 V ± 20mV 1.0 s Available S-8232AWFT-T2-G 4.35 V ± 25 mV 4.15 V ± 50 mV 2.30 V ± 80 mV 3.00 V ± 100 mV 0.150 V ± 20 mV 1.0 s Unavailable S-8232AXFT-T2-G 4.325 V ± 25 mV 4.200 V ± 50 mV 2.30 V ± 80 mV 3.00 V ± 100 mV 0.20 V ± 20 mV 1.0 s Unavailable S-8232AYFT-T2-G 4.30 V ± 25 mV 4.05 V ± 50 mV 2.00 V ± 80 mV 2.00 V ± 80 mV 0.20 V ± 20 mV 1.0 s Available S-8232AZFT-T2-G 4.30 V ± 25 mV 4.05 V ± 50 mV 2.30 V ± 80 mV 2.30 V ± 80 mV 0.20 V ± 20 mV 1.0 s Available Seiko Instruments Inc. 3 BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK S-8232 Series Rev.5.4_00 Table 1 (2 / 2) Product name / Item S-8232NAFT-T2-G Overcharge detection voltage 1, 2 VCU Overcharge release voltage 1, 2 VCD *1 *3 4.325 V ± 25 mV 4.325 V ± 25 mV Overcharge detection 0 V battery delay time charging tCU function (C3 = 0.22 µF) 2.40 V ± 80 mV 3.00 V ± 100 mV 0.15 V ± 20 mV 1.0 s Unavailable Overdischarge detection voltage 1, 2 VDD Overdischarge release voltage1, 2 VDU Overcurrent detection voltage 1 VIOV1 S-8232NBFT-T2-G 4.35 V ± 25 mV 4.25 V ± 50 mV 3.00 V ± 80 mV 3.70 V ± 100 mV 0.30 V ± 20 mV 1.0 s Unavailable S-8232NCFT-T2-G 4.275 V ± 25 mV 4.05 V ± 50 mV 2.20 V ± 80 mV 3.00 V ± 100 mV 0.20 V ± 20 mV 1.0 s Unavailable S-8232NDFT-T2-G 4.35 V ± 25 mV 4.15 V ± 50 mV 2.30 V ± 80 mV 2.30 V ± 80 mV 0.15 V ± 20 mV 1.0 s Available S-8232NEFT-T2-G 4.35 V ± 25 mV 4.15 V ± 50 mV 2.30 V ± 80 mV 3.00 V ± 100 mV 0.23 V ± 20 mV 1.0 s Available *3 S-8232NFFT-T2-G 4.325 V ± 25 mV 4.1 V ± 50 mV 2.30 V ± 80 mV 2.90 V ± 100 mV 0.21 V ± 20 mV 1.0 s Unavailable S-8232NGFT-T2-G 4.35 V ± 25 mV 4.15 V ± 50 mV 2.60 V ± 80 mV 3.00 V ± 100 mV 0.30 V ± 20 mV 1.0 s Available S-8232NHFT-T2-G 4.28 V ± 25 mV 4.05 V ± 50 mV 2.30 V ± 80 mV 2.90 V ± 100 mV 0.11 V ± 20 mV 1.0 s Unavailable 4.05 V ± 50 mV *3 S-8232NIFT-T2-G 4.25 V ± 25 mV 2.50 V ± 80 mV 3.00 V ± 100 mV 0.15 V ± 20 mV 1.0 s Unavailable S-8232NJFT-T2-G 4.28 V ± 25 mV 4.05 V ± 50 mV 2.30 V ± 80 mV 2.90 V ± 100 mV 0.11 V ± 20 mV 1.0 s Available S-8232NKFT-T2-G 4.35 V ± 25 mV 4.15 V ± 50 mV 2.30 V ± 80 mV 2.30 V ± 80 mV 0.12 V ± 20 mV 1.0 s Available S-8232NLFT-T2-G 4.30 V ± 25 mV 4.05 V ± 50 mV 2.30 V ± 80 mV 3.00 V ± 100 mV 0.23 V ± 20 mV 1.0 s Available S-8232NMFT-T2-G 4.28 V ± 25 mV 4.05 V ± 50 mV 2.30 V ± 80 mV 2.90 V ± 100 mV 0.08 V ± 20 mV 1.0 s Available S-8232NNFT-T2-G 4.28 V ± 25 mV S-8232NOFT-T2-G 4.295 V ± 25 mV 4.08 V ± 50 mV *3 2.20 V ± 80 mV 2.40 V ± 100 mV 0.13 V ± 20 mV 1.0 s Unavailable 4.045 V ± 50 mV *3 2.20 V ± 80 mV 2.40 V ± 100 mV 0.13 V ± 20 mV 1.0 s Unavailable S-8232NPFT-T2-G 4.25 V ± 25 mV 4.05 V ± 50 mV 2.30 V ± 80 mV 3.00 V ± 100 mV 0.30 V ± 20 mV 1.0 s Unavailable S-8232NQFT-T2-G 4.25 V ± 25 mV 4.05 V ± 50 mV 2.60 V ± 80 mV 3.00 V ± 100 mV 0.30 V ± 20 mV 1.0 s Unavailable S-8232NRFT-T2-G 4.15 V ± 25 mV 3.95 V ± 50 mV 2.60 V ± 80 mV 3.00 V ± 100 mV 0.30 V ± 20 mV 1.0 s Unavailable S-8232NSFT-T2-G 4.15 V ± 25 mV 3.95 V ± 50 mV 2.30 V ± 80 mV 3.00 V ± 100 mV 0.30 V ± 20 mV 1.0 s Unavailable S-8232NTFT-T2-G 4.225 V ± 25 mV 4.15 V ± 50 mV 2.00 V ± 80 mV 2.00 V ± 100 mV 0.09 V ± 20 mV 1.0 s Unavailable 3.85 V ± 25 mV 3.75 V ± 50 mV 2.23 V ± 80 mV 2.23 V ± 80 mV 0.15 V ± 20 mV 1.0 s Available 4.125 V ± 50 mV 2.00 V ± 80 mV 2.00 V ± 80 mV 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”. 0.09 V ± 20 mV 1.0 s Unavailable S-8232NUFT-T2-G S-8232NWFT-T2-G 4.210 V ± 25 mV *1. *2. *3. *4. 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 VDD 1.70 to 2.60 V 1.70 to 2.80 V 1.70 to 3.00 V 4 Overcharge detection voltage 1, 2 VCU 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 VCU − VCD 0 to 0.30 V 0 to 0.20 V 0 to 0.10 V Seiko Instruments Inc. BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK S-8232 Series Rev.5.4_00 Pin Configuration Table 3 8-Pin TSSOP Top view SENS DO CO VM 8 7 6 5 1 2 3 4 Figure 2 VCC VC ICT VSS Pin No. 1 Symbol SENS 2 DO 3 CO 4 VM 5 6 7 8 VSS ICT VC VCC 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 BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK S-8232 Series Rev.5.4_00 Absolute Maximum Ratings Table 4 Item Input voltage between VCC and VSS SENS input pin voltage ICT input pin voltage VM input pin voltage DO output pin voltage CO output pin voltage Power dissipation Symbol VDS VSENS VICT VVM VDO VCO Applied Pin VCC SENS ICT VM DO CO PD Operating ambient temperature Topr Storage temperature Tstg *1. When mounted on board [Mounted board] (1) Board size : 114.3 mm × 76.2 mm × t1.6 mm (2) Name : JEDEC STANDARD51-7 (Ta = 25 °C unless otherwise specified) Absolute Maximum Ratings Unit V VSS − 0.3 to VSS + 18 V VSS − 0.3 to VCC + 0.3 V VSS − 0.3 to VCC + 0.3 V VCC − 18 to VCC + 0.3 V VSS − 0.3 to VCC + 0.3 V VVM − 0.3 to VCC + 0.3 300 (When not mounted on board) mW 700*1 mW − 40 to + 85 °C − 40 to + 125 °C Power Dissipation (PD) [mW] Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions. 800 700 600 500 400 300 200 100 0 0 100 150 50 Ambient Temperature (Ta) [°C] Figure 3 Power Dissipation of Package (When Mounted on Board) 6 Seiko Instruments Inc. BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK S-8232 Series Rev.5.4_00 Electrical Characteristics Table 5 Item Symbol [DETECTION VOLTAGE] VCU1, 2 3.85 to 4.60 V, Adjustable Overcharge detection voltage 1, 2 Auxiliary overcharge detection voltage 1, 2 *1 VCUaux1, VCUaux2 = VCU1, VCU2 × 1.25 or VCUaux1, VCUaux2 = VCU1, VCU2 × 1.11 VCUaux1, 2 VCU1, 2 × 1.25 VCUaux1, 2 VCU1, 2 × 1.11 Overcharge release voltage 1, 2 Overdischarge detection voltage 1, 2 Overdischarge release voltage 1, 2 Overcurrent detection voltage 1 Overcurrent detection voltage 2 Temperature coefficient 1 for detection voltage Temperature coefficient 2 for detection voltage *3 [DELAY TIME (C3 = 0.22 µF) ] Overcharge detection delay time 1, 2 Overdischarge detection delay time 1, 2 Overcurrent detection delay time 1 [INPUT VOLTAGE] *2 Input voltage between VCC and VSS [OPERATING VOLTAGE] Operating voltage between VCC and VSS *4 [CURRENT CONSUMPTION] Current consumption during normal operation Current consumption at power down [OUTPUT VOLTAGE] Condition VCU1, 2 − 0.025 VCU1, 2 × 1.21 VCU1, 2 × 1.07 VCD1, 2 − 0.050 VDD1, 2 − 0.080 VDU1, 2 − 0.100 VIOV1 − 0.020 to 4.60 V, VCD1, 2 3.60 Adjustable VDD1, 2 1.70 to 2.60 V, Adjustable VDU1, 2 1.70 to 3.80 V, Adjustable VIOV1 0.07 to 0.30 V, Adjustable VIOV2 Load short circuit, − 1.57 VCC reference TCOE1 Ta = − 40 to + 85 °C − 0.6 TCOE2 Ta = − 40 to + 85 °C − 0.24 tCU1, 2 1.0 s tDD1, 2 0.1 s tIOV1 0.01 s VDS Absolute maximum rating VDSOP Output logic fixed IOPE IPDN V1 = V2 = 3.6 V V1 = V2 = 1.5 V DO voltage “H” VDO(H) IOUT = 10 µA DO voltage “L” VDO(L) IOUT = 10 µA CO voltage “H” VCO(H) IOUT = 10 µA [CO PIN INTERNAL RESISTANCE] Resistance between VSS and CO [INTERNAL RESISTANCE] Resistance between VCC and VM Resistance between VSS and VM [0 V BATTERY CHARGE FUNCTION] (Ta = 25 °C unless otherwise specified) Test Test Min. Typ. Max. Unit Condition Circuit VCU1, 2 VCU1, 2 + 0.025 VCU1, 2 VCU1, 2 × 1.25 × 1.29 VCU1, 2 VCU1, 2 × 1.11 × 1.15 VCD1, 2 VCD1, 2 + 0.050 VDD1, 2 VDD1 ,2 + 0.080 VDU1, 2 VDU1, 2 + 0.100 VIOV1 VIOV1 + 0.020 V 1, 2 1 V 1, 2 1 V 1, 2 1 V 1, 2 1 V 1, 2 1 V 1, 2 1 V 3 1 − 1.20 − 0.83 V 3 1 0 − 0.05 0.6 0 mV/°C mV/°C 0.73 68 6.7 1.00 100 10 1.35 138 13.9 s ms ms 8, 9 8, 9 10 5 5 5 − 0.3 18 V 2.0 16 V 2.1 0 7.5 0.0002 12.7 0.04 µA µA 4 4 2 2 V 6 3 V 6 3 V 7 4 VCC VCC VCC − 0.05 − 0.003 VSS VSS VSS + 0.003 + 0.05 VCC VCC VCC − 0.15 − 0.019 RCOL VCO − VSS = 9.4 V 0.29 0.6 1.44 MΩ 7 4 RVCM VCC − VVM = 0.5 V RVSM VVM − VSS = 1.1 V 105 511 240 597 575 977 kΩ kΩ 5 5 2 2 V0CHA 0 V battery charging 0.38 0.75 1.12 V 11 6 function “available” 0 V battery charging 0.32 0.88 1.44 V 12, 13 6 0 V battery charge inhibition battery voltage 1, 2 V0INH1, 2 function “unavailable” *1. Auxiliary overcharge detection voltage is equal to the overcharge detection voltage times 1.11 for the products without overcharge hysteresis, and times 1.25 for other products. *2. Temperature coefficient 1 for detection voltage should be applied to overcharge detection voltage, overcharge release voltage, overdischarge detection voltage, and overdischarge release voltage. *3. Temperature coefficient 2 for detection voltage should be applied to overcurrent detection voltage. *4. The DO and CO pin logic are established at the operating voltage. 0 V battery charge starting charger voltage Seiko Instruments Inc. 7 BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK S-8232 Series Rev.5.4_00 Table 6 Item Symbol [DETECTION VOLTAGE] VCU1, 2 3.85 to 4.60 V, Adjustable Overcharge detection voltage 1, 2 Auxiliary overcharge detection voltage 1, 2 *1 VCUaux1, VCUaux2 = VCU1, VCU2 × 1.25 or VCUaux1, VCUaux2 = VCU1, VCU2 × 1.11 VCUaux1, 2 VCU1, 2 × 1.25 VCUaux1, 2 VCU1, 2 × 1.11 Overcharge release voltage 1, 2 Overdischarge detection voltage 1, 2 Overdischarge release voltage 1, 2 Overcurrent detection voltage 1 Overcurrent detection voltage 2 Temperature coefficient 1 for detection voltage Temperature coefficient 2 for detection voltage *3 [DELAY TIME (C3 = 0.22 µF) ] Overcharge detection delay time 1, 2 Overdischarge detection delay time 1, 2 Overcurrent detection delay time 1 [INPUT VOLTAGE] *2 Input voltage between VCC and VSS [OPERATING VOLTAGE] Operating voltage between VCC and VSS *4 [CURRENT CONSUMPTION] Current consumption during normal operation Current consumption at power down [OUTPUT VOLTAGE] (Ta = − 20 to + 70 °C unless otherwise specified) Test Test Condition Min. Typ. Max. Unit Condition Circuit to 4.60 V, VCD1, 2 3.60 Adjustable to 2.60 V, VDD1, 2 1.70 Adjustable VDU1, 2 1.70 to 3.80 V, Adjustable VIOV1 0.07 to 0.30 V, Adjustable VIOV2 Load short circuit, − 1.66 VCC reference TCOE1 Ta = − 40 to + 85 °C − 0.6 TCOE2 Ta = − 40 to + 85 °C − 0.24 tCU1, 2 1.0 s tDD1, 2 0.1 s tIOV1 0.01 s VDS Absolute maximum rating VDSOP Output logic fixed IOPE IPDN V1 = V2 = 3.6 V V1 = V2 = 1.5 V DO voltage “H” VDO(H) IOUT = 10 µA DO voltage “L” VDO(L) IOUT = 10 µA CO voltage “H” VCO(H) IOUT = 10 µA [CO PIN INTERNAL RESISTANCE] Resistance between VSS and CO [INTERNAL RESISTANCE] Resistance between VCC and VM Resistance between VSS and VM [0 V BATTERY CHARGE FUNCTION] VCU1, 2 − 0.045 VCU1, 2 × 1.19 VCU1, 2 × 1.05 VCD1, 2 − 0.070 VDD1, 2 − 0.100 VDU1, 2 − 0.120 VIOV1 − 0.029 VCU1, 2 VCU1, 2 + 0.040 VCU1, 2 VCU1, 2 × 1.25 × 1.31 VCU1, 2 VCU1, 2 × 1.11 × 1.17 VCD1, 2 VCD1, 2 + 0.065 VDD1, 2 VDD1 ,2 + 0.095 VDU1, 2 VDU1, 2 + 0.115 VIOV1 VIOV1 + 0.029 V 1, 2 1 V 1, 2 1 V 1, 2 1 V 1, 2 1 V 1, 2 1 V 1, 2 1 V 3 1 − 1.20 − 0.74 V 3 1 0 − 0.05 0.6 0 mV/°C mV/°C 0.60 67 6.5 1.00 100 10 1.84 140 14.5 s ms ms 8, 9 8, 9 10 5 5 5 − 0.3 18 V 2.0 16 V 1.9 0 7.5 0.0002 13.8 0.06 µA µA 4 4 2 2 V 6 3 V 6 3 V 7 4 VCC VCC VCC − 0.14 − 0.003 VSS VSS VSS + 0.003 + 0.14 VCC VCC VCC − 0.24 − 0.019 RCOL VCO − VSS = 9.4 V 0.24 0.6 1.96 MΩ 7 4 RVCM VCC − VVM = 0.5 V RVSM VVM − VSS = 1.1 V 86 418 240 597 785 1332 kΩ kΩ 5 5 2 2 V0CHA 0 V battery charging 0.29 0.75 1.21 V 11 6 function “available” 0 V battery charging 0.23 0.88 1.53 V 12, 13 6 0 V battery charge inhibition battery voltage 1, 2 V0INH1, 2 function “unavailable” *1. Auxiliary overcharge detection voltage is equal to the overcharge detection voltage times 1.11 for the products without overcharge hysteresis, and times 1.25 for other products. *2. Temperature coefficient 1 for detection voltage should be applied to overcharge detection voltage, overcharge release voltage, overdischarge detection voltage, and overdischarge release voltage. *3. Temperature coefficient 2 for detection voltage should be applied to overcurrent detection voltage. *4. The DO pin and CO pin logic are established at the operating voltage. 0 V battery charge starting charger voltage 8 Seiko Instruments Inc. BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK S-8232 Series Rev.5.4_00 Table 7 Item Symbol [DETECTION VOLTAGE] VCU1, 2 3.85 to 4.60 V, Adjustable Overcharge detection voltage 1, 2 Auxiliary overcharge detection voltage 1, 2 *1 VCUaux1, VCUaux2 = VCU1, VCU2 × 1.25 or VCUaux1, VCUaux2 = VCU1, VCU2 × 1.11 VCUaux1, 2 VCU1, 2 × 1.25 VCUaux1, 2 VCU1, 2 × 1.11 Overcharge release voltage 1, 2 Overdischarge detection voltage 1, 2 Overdischarge release voltage 1, 2 Overcurrent detection voltage 1 Overcurrent detection voltage 2 Temperature coefficient 1 for detection voltage Temperature coefficient 2 for detection voltage *3 [DELAY TIME (C3 = 0.22 µF) ] Overcharge detection delay time 1, 2 Overdischarge detection delay time 1, 2 Overcurrent detection delay time 1 [INPUT VOLTAGE] *2 Input voltage between VCC and VSS [OPERATING VOLTAGE] Operating voltage between VCC and VSS *4 [CURRENT CONSUMPTION] Current consumption during normal operation Current consumption at power down [OUTPUT VOLTAGE] (Ta = − 40 to +85 °C unless otherwise specified) Test Test Condition Min. Typ. Max. Unit Condition Circuit to 4.60 V, VCD1, 2 3.60 Adjustable to 2.60 V, VDD1, 2 1.70 Adjustable VDU1, 2 1.70 to 3.80 V, Adjustable VIOV1 0.07 to 0.30 V, Adjustable VIOV2 Load short circuit, − 1.70 VCC reference TCOE1 Ta = − 40 to + 85 °C − 0.6 TCOE2 Ta = − 40 to + 85 °C − 0.24 tCU1, 2 1.0 s tDD1, 2 0.1 s tIOV1 0.01 s VDS Absolute maximum rating VDSOP Output logic fixed IOPE IPDN V1 = V2 = 3.6 V V1 = V2 = 1.5 V DO voltage “H” VDO(H) IOUT = 10 µA DO voltage “L” VDO(L) IOUT = 10 µA CO voltage “H” VCO(H) IOUT = 10 µA [CO PIN INTERNAL RESISTANCE] Resistance between VSS and CO [INTERNAL RESISTANCE] Resistance between VCC and VM Resistance between VSS and VM [0 V BATTERY CHARGE FUNCTION] VCU1, 2 − 0.055 VCU1, 2 × 1.19 VCU1, 2 × 1.05 VCD1, 2 − 0.080 VDD1, 2 − 0.110 VDU1, 2 − 0.130 VIOV1 − 0.033 VCU1, 2 VCU1, 2 + 0.045 VCU1, 2 VCU1, 2 × 1.25 × 1.31 VCU1, 2 VCU1, 2 × 1.11 × 1.17 VCD1, 2 VCD1, 2 + 0.070 VDD1, 2 VDD1 ,2 + 0.100 VDU1, 2 VDU1, 2 + 0.120 VIOV1 VIOV1 + 0.033 V 1, 2 1 V 1, 2 1 V 1, 2 1 V 1, 2 1 V 1, 2 1 V 1, 2 1 V 3 1 − 1.20 − 0.71 V 3 1 0 − 0.05 0.6 0 mV/°C mV/°C 0.55 67 6.3 1.00 100 10 2.06 141 14.7 s ms ms 8, 9 8, 9 10 5 5 5 − 0.3 18 V 2.0 16 V 1.8 0 7.5 0.0002 14.2 0.10 µA µA 4 4 2 2 V 6 3 V 6 3 V 7 4 VCC VCC VCC − 0.17 − 0.003 VSS VSS VSS + 0.003 + 0.17 VCC VCC VCC − 0.27 − 0.019 RCOL VCO − VSS = 9.4 V 0.22 0.6 2.20 MΩ 7 4 RVCM VCC − VVM = 0.5 V RVSM VVM − VSS = 1.1 V 79 387 240 597 878 1491 kΩ kΩ 5 5 2 2 V0CHA 0 V battery charging 0.26 0.75 1.25 V 11 6 function “available” 0 V battery charging 0.20 0.88 1.57 V 12, 13 6 0 V battery charge inhibition battery voltage 1, 2 V0INH1, 2 function “unavailable” *1. Auxiliary overcharge detection voltage is equal to the overcharge detection voltage times 1.11 for the products without overcharge hysteresis, and times 1.25 for other products. *2. Temperature coefficient 1 for detection voltage should be applied to overcharge detection voltage, overcharge release voltage, overdischarge detection voltage, and overdischarge release voltage. *3. Temperature coefficient 2 for detection voltage should be applied to overcurrent detection voltage. *4. The DO pin and CO pin logic are established at the operating voltage. 0 V battery charge starting charger voltage Seiko Instruments Inc. 9 BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK S-8232 Series Rev.5.4_00 Test Circuits (1) Test Condition 1, Test Circuit 1 Set S1 = OFF, V1 = V2 = 3.6 V, and V3 = 0 V under normal condition. Increase V1 from 3.6 V gradually. The V1 voltage when CO = “L” is overcharge detection voltage 1 (VCU1). Decrease V1 gradually. The V1 voltage when CO = “H” is overcharge release voltage 1 (VCD1). Further decrease V1. The V1 voltage when DO = “L” is overdischarge voltage 1 (VDD1). Increase V1 gradually. The V1 voltage when DO = “H” is overdischarge release voltage 1 (VDU1). Set S1 = ON, and V1 = V2 = 3.6 V and V3 = 0 V under normal condition. Increase V1 from 3.6 V gradually. The V1 voltage when CO = “L” is auxiliary overcharge detection voltage 1 (VCUaux1). (2) Test Condition 2, Test Circuit 1 Set S1 = OFF, V1 = V2 = 3.6 V, and V3 = 0 V under normal condition. Increase V2 from 3.6 V gradually. The V2 voltage when CO = “L” is overcharge detection voltage 2 (VCU2). Decrease V2 gradually. The V2 voltage when CO = “H” is overcharge release voltage 2 (VCD2). Further decrease V2. The V2 voltage when DO = “L” is overdischarge voltage 2 (VDD2). Increase V2 gradually. The V2 voltage when DO = “H” is overdischarge release voltage 2 (VDU2). Set S1 = ON, and V1 = V2 = 3.6 V and V3 = 0 V under normal condition. Increase V2 from 3.6 V gradually. The V2 voltage when CO = “L” is auxiliary overcharge detection voltage 2 (VCUaux2). (3) Test Condition 3, Test Circuit 1 Set S1 = OFF, V1 = V2 = 3.6 V, and V3 = 0 V under normal condition. Increase V3 from 0 V gradually. The V3 voltage when DO = “L” is overcurrent detection voltage 1 (VIOV1). Set S1 = ON, V1 = V2 = 3.6 V, V3 = 0 under normal condition. Increase V3 from 0 V gradually. (The voltage change rate < 1.0 V / ms) V3 − (V1 + V2) voltage when DO = “L” is overcurrent detection voltage 2 (VIOV2). (4) Test Condition 4, Test Circuit 2 Set S1 = ON, V1 = V2 = 3.6 V, and V3 = 0 V under normal condition and measure current consumption. Current consumption I1 is the normal condition current consumption (IOPE). Set S1 = OFF, V1 = V2 = 1.5 V under overdischarge condition and measure current consumption. Current consumption I1 is the power-down current consumption (IPDN). (5) Test Condition 5, Test Circuit 2 Set S1 = ON, V1 = V2 = V3 = 1.5 V, and V3 = 2.5 V under overdischarge condition. (V1 + V2 − V3) / I2 is the internal resistance between VCC and VM (RVCM). Set S1 = ON, V1 = V2 = 3.6 V, and V3 = 1.1 V under overcurrent condition. V3 / I2 is the internal resistance between VSS and VM (RVSM). (6) Test Condition 6, Test Circuit 3 Set S1 = ON, S2 = OFF, V1 = V2 = 3.6 V, and V3 = 0 V under normal condition. Increase V4 from 0 V gradually. The V4 voltage when I1 = 10 µA is DO voltage “H” (VDO(H)). Set S1 = OFF, S2 = ON, V1 = V2 = 3.6 V, and V3 = 0.5 V under overcurrent condition. Increase V5 from 0 V gradually. The V5 voltage when I2 = 10 µA is the DO voltage “L” (VDO(L)). 10 Seiko Instruments Inc. Rev.5.4_00 BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK S-8232 Series (7) Test Condition 7, Test Circuit 4 Set S1 = ON, S2 = OFF, V1 = V2 = 3.6 V and V3 = 0 V under normal condition. Increase V4 from 0 V gradually. The V4 voltage when I1 = 10 µA is the CO “H” voltage (VCO(H)). Set S1 = OFF, S2 = ON, V1 = V2 = 4.7, V3 = 0 V, and V5 = 9.4 V under over voltage condition. (V5) / I2 is the CO pin internal resistance (RCO(L)). (8) Test Condition 8, Test Circuit 5 Set V1 = V2 = 3.6 V, and V3 = 0 V under normal condition. Increase V1 from (VCU1 − 0.2 V) to (VCU1 + 0.2 V) immediately (within 10 µs). The time after V1 becomes (VCU1 + 0.2 V) until CO goes “L” is the overcharge detection delay time 1 (tCU1). Set V1 = V2 = 3.6 V, and V3 = 0 V under normal condition. Decrease V1 from (VDD1 + 0.2 V) to (VDD1 − 0.2 V) immediately (within 10 µs). The time after V1 becomes (VDD1 − 0.2 V) until DO goes “L” is the overdischarge detection delay time 1 (tDD1). (9) Test Condition 9, Test Circuit 5 Set V1 = V2 = 3.6 V, and V3 = 0 V under normal condition. Increase V2 from (VCU2 − 0.2 V) to (VCU2 + 0.2 V) immediately (within 10 µs). The time after V2 becomes (VCU2 + 0.2 V) until CO goes “L” is the overcharge detection delay time 2 (tCU2). Set V1 = V2 = 3.6 V, and V3 = 0 V under normal condition. Decrease V2 from (VDD2 + 0.2 V) to (VDD2 − 0.2 V) immediately (within 10 µs). The time after V2 becomes (VDD2 − 0.2 V) until DO goes “L” is the overdischarge detection delay time 2 (tDD2). (10) Test Condition 10, Test Circuit 5 Set V1 = V2 = 3.6 V, and V3 = 0 V under normal condition. Increase V3 from 0 V to 0.5 V immediately (within 10 µs). The time after V3 becomes 0.5 V until DO goes “L” is the overcurrent detection delay time 1 (tIOV1). (11) Test Condition 11, Test Circuit 6 Set V1 = V2 = 0 V, and V3 = 0 V, and increase V3 gradually. The V3 voltage when CO = “L” (VVM + 0.3 V or higher) is the 0 V charge starting voltage (V0CHA). (12) Test Condition 12, Test Circuit 6 Set V1 = 0 V, V2 = 3.6 V, and V3 = 12 V, and increase V1 gradually. The V1 voltage when CO = “H” (VVM + 0.3 V or higher) is the 0 V charge inhibiting voltage 1 (V0INH1). (13) Test Condition 13, Test Circuit 6 Set V1 = 3.6 V, V2 = 0 V, and V3 = 12 V, and increase V2 gradually. The V2 voltage when CO = “H” (VVM + 0.3 V or higher) is the 0 V charge inhibiting voltage 2 (V0INH2). Seiko Instruments Inc. 11 BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK S-8232 Series SENS Rev.5.4_00 SENS I1 VCC VCC V1 S-8232 Series ICT VC S-8232 Series V1 S1 ICT VC V2 V2 VM VSS DO VM VSS CO DO V3 CO I2 V3 S1 Test Circuit 1 Test Circuit 2 SENS SENS VCC VCC S-8232 Series V1 VC S-8232 Series V1 ICT ICT VC V2 V2 VM VSS CO DO VM VSS DO CO V3 V3 V5 V4 S2 I2 V5 S1 I1 V4 Test Circuit 3 SENS S-8232 Series S1 I1 SENS ICT C3 VCC S-8232 Series V1 VC ICT VC V2 V2 VM VSS DO VM VSS CO DO V3 CO V3 Test Circuit 5 Test Circuit 6 Figure 4 12 I2 Test Circuit 4 C3 = 0.22 µF VCC V1 S2 Seiko Instruments Inc. 4.7 MΩ Rev.5.4_00 BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK S-8232 Series Operation Normal Condition *1, *2 This IC monitors the voltages of the two serially connected batteries and the discharge current to control charging and discharging. When the voltages of two batteries are in the range from the overdischarge detection voltage (VDD1, 2) to the overcharge detection voltage (VCU1, 2), and the current flowing through the batteries becomes equal or lower than a specified value (the VM pin voltage is equal or lower than overcurrent detection voltage 1), the charging and discharging FETs are turned on. In this condition, charging and discharging can be carried out freely. This condition is called normal condition. In this condition, the VM and VSS pins are shorted by the RVSM resistor. Overcurrent Condition When the discharging current becomes equal to or higher than a specified value (the VM pin voltage is equal to or higher than the overcurrent detection voltage) during discharging under normal condition and it continues for the overcurrent detection delay time (tIOV) or longer, the discharging FET is turned off to stop discharging. This condition is called overcurrent condition. The VM and VSS pins are shorted by the RVSM resistor at this time. The charging FET is also turned off. When the discharging FET is off and a load is connected, the VM pin voltage equals the VCC potential. The overcurrent condition returns to the normal condition when the load is released and the impedance between the EB− and EB+ pins (refer to the Figure 8) is 200 MΩ or higher. When the load is released, the VM pin, which is shorted to the VSS pin with the RVSM resistor, goes back to the VSS potential. The IC detects that the VM pin potential returns to overcurrent detection voltage 1 (VIOV1) or lower and returns to the normal condition. Overcharge Condition Following two cases are detected as overcharge conditions : (1) If one of the battery voltages becomes higher than the overcharge detection voltage (VCU1, 2) during charging under normal condition and it continues for the overcharge detection delay time (tCU1, 2) or longer, the charging FET turns off to stop charging. (2) If one of the battery voltages becomes higher than the auxiliary overcharge detection voltage (VCUaux1, 2) the charging FET turns off immediately to stop charging. The VM and VSS pins are shorted by the RVSM resistor under the overcharge condition. The auxiliary overcharge detection voltages (VCUaux1, 2) are correlated with the overcharge detection voltages (VCU1, 2) and are defined by following equations : VCUaux1, 2 [V] = 1.25 × VCU1, 2 [V] or for no overcharge hysteresis type (VCU1, 2 = VCD1, 2) VCUaux1, 2 [V] = 1.11 × VCU1, 2 [V] The overcharge condition is released in two cases : (1) The battery voltage which exceeded the overcharge detection voltage (VCU1, 2) falls below the overcharge release voltage (VCD1, 2), the charging FET turns on and the normal condition returns. (2) If the battery voltage which exceeded the overcharge detection voltage (VCU1, 2) is equal or higher than the overcharge release voltage (VCD1, 2), but the charger is removed, a load is placed, and discharging starts, the charging FET turns on and the normal condition returns. The release mechanism is as follows : the discharge current flows through an internal parasitic diode of the charging FET immediately after a load is installed and discharging starts, and the VM pin voltage increases by about 0.6 V from the VSS pin voltage momentarily. The IC detects this voltage (overcurrent detection voltage 1 or higher), releases the overcharge condition and returns to the normal condition. Overdischarge Condition If any one of the battery voltages falls below the overdischarge detection voltage (VDD1, 2) during discharging under normal condition and it continues for the overdischarge detection delay time (tDD1, 2) or longer, the discharging FET turns off and discharging stops. This condition is called the overdischarge condition. When the discharging FET turns off, the VM pin voltage becomes equal to the VCC voltage and the IC’s current consumption falls below the power-down current consumption (IPDN). This condition is called the power-down condition. The VM and VCC pins are shorted by the RVCM resistor under the overdischarge and power-down conditions. The power-down condition is canceled when the charger is connected and the voltage between VM and VCC is overcurrent detection voltage 2 or higher. When all the battery voltages becomes equal to or higher than the overdischarge release voltage (VDU1, 2) in this condition, the overdischarge condition changes to the normal condition. Seiko Instruments Inc. 13 BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK S-8232 Series Rev.5.4_00 Delay Circuit The overcharge detection delay time (tCU1, 2), the overdischarge detection delay time (tDD1, 2), and the overcurrent detection delay time 1 (tI0V1) change with an external capacitor (C3). Since one capacitor determine each delay time, delay times are correlated by the following ratio : Overcharge delay time : Overdischarge delay time : Overcurrent delay time = 100 : 10 : 1 The delay times are calculated by the following equations : (Ta = − 40 to + 85 °C) Min., Typ., Max. Overcharge detection delay time tCU [s] = Delay factor ( 2.500, 4.545, 9.364 ) × C3 [µF] Overdischarge detection delay time tDD [s] = Delay factor ( 0.3045, 0.4545, 0.6409 ) × C3 [µF] Overcurrent detection delay time tIOV1 [s] = Delay factor ( 0.02864, 0.04545, 0.06682 ) × C3 [µF] Remark The delay time for overcurrent detection 2 is fixed by an internal circuit. The delay time cannot be changed via an external capacitor. 0 V Battery Charging Function *3 This function is used to recharge both of two serially-connected batteries after they self-discharge to 0 V. When the 0 V charging start voltage (V0CHA) or higher is applied to between VM and VCC by connecting the charger, the charging FET gate is fixed to VCC potential. When the voltage between the gate and the source of the charging FET becomes equal to or higher than the turn-on voltage by the charger voltage, the charging FET turns on to start charging. At this time, the discharging FET turns off and the charging current flows through the internal parasitic diode in the discharging FET. If all the battery voltages become equal to or higher than the overdischarge release voltage (VDU1, 2), the normal condition returns. 0 V Battery Charge Inhibiting Function *3 This function is used for inhibiting charging when either of the connected batteries goes 0 V due to its self-discharge. When the voltage of either of the connected batteries goes below 0 V charge inhibit voltage 1 and 2 (V0INH1, 2), the charging FET gate is fixed to "EB−" to inhibit charging. Charging is possible only when the voltage of both connected batteries goes 0 V charge inhibit voltage 1 and 2 (V0INH1, 2) or more. Note that charging may be possible when the total voltage of both connected batteries is less than the minimum value (VDSOPmin) of the operating voltage between VCC and VSS even if the voltage of either of the connected batteries is 0 V charge inhibit voltage 1 and 2 (V0INH1, 2) or less. Charging is prohibited when the total voltage of both connected batteries reaches the minimum value (VDSOPmin) of the operating voltage between VCC and VSS. When using this optional function, a resistor of 4.7 MΩ is needed between the gate and the source of the charging control FET (refer to the Figure 8). *1. When initially connecting batteries, the IC may fail to enter the normal condition (discharging ready state). If so, once set the VM pin to VSS voltage (short pins VM and VSS or connect a charger). *2. The products indicated with *4 of the 2. Product Name List in the “ Product Name Structure” are set to “overcharge detection / release hysteresis”, “no final overcharge function”, and “0 V battery charge inhibiting function.” The following phenomena may be found, but there is no problem for practical use. The product is an overcurrent condition due to overload connection when the battery voltage is overcharge release voltage (VCD1, 2) or more and overcharge detection voltage (VCU1, 2) or less. Usually, the IC returns to its normal condition when overload is removed under this condition. However, the charging FET may be turned OFF when overload is removed under this condition, leading to an overcharge condition. If so, attach load to start discharge. The charging FET is turned ON to return to the normal condition. Refer to the “Overcharge condition” in this section. *3. Some lithium ion batteries are not recommended to be recharged after having been completely discharged. Please contact the battery manufacturer when you decide to select a 0 V battery charging function. 14 Seiko Instruments Inc. BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK S-8232 Series Rev.5.4_00 Timing Charts 1. Overcharge Detection V2 battery V1 battery VCUaux VCU Battery VCD voltage VDU VDD VSS VCC DO pin voltage V1 auxiliary over voltage detect V2 over voltage detect V1 over voltage detect V2 auxiliary over voltage detect VSS VCC CO pin voltage VSS EB− VCC VIOV2 VM pin voltage VIOV1 VSS EB− Charger connection Load connection Mode Delay time = 0 *1 <1> *1. <1> <2> <3> <4> Delay time = 0 Delay Delay <2> <1> <2> <1> <2> <1> <2> <1> Normal mode Over charge mode Over discharge mode Over current mode Remark The charger is assumed to charge with a constant current. Figure 5 Seiko Instruments Inc. 15 BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK S-8232 Series Rev.5.4_00 2. Overdischarge Detection V2 battery V1 battery VCU VCD Battery VDU voltage V DD VSS VCC DO pin voltage VSS Vcc CO pin voltage Vss EB− VCC VM pin VIOV2 voltage VIOV1 VSS EB− Charger connection Load connection Delay Delay No Delay Mode *1 <1> *1. <1> <2> <3> <4> <3> <1> <3> Normal mode Over charge mode Over discharge mode Over current mode Remark The charger is assumed to charge with a constant current. Figure 6 16 Seiko Instruments Inc. <2> & <3> <3> BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK S-8232 Series Rev.5.4_00 3. Overcurrent Detection V1 = V2 battery VCU Battery VCD voltage VDU VDD VCC DO pin voltage VSS CO pin voltage VCC VSS EB− VM pin voltage VCC VIOV2 VIOV1 VSS EB− Charger connection Load connection delay = tIOV1 Mode delay = tIOV2 < tIOV1 *1 <1> *1. <1> <2> <3> <4> <4> <1> <4> <1> Normal mode Over charge mode Over discharge mode Over current mode Remark The charger is assumed to charge with a constant current. Figure 7 Seiko Instruments Inc. 17 BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK S-8232 Series Rev.5.4_00 Battery Protection IC Connection Example EB+ R4 1 kΩ SENS R1 1 kΩ VCC Battery 1 C1 0.22 µF R2 1 kΩ S-8232 Series VC Battery 2 C2 0.22 µF ICT VSS DO CO VM Delay time setting C3 0.22 µF FET1 R5 4.7 MΩ FET2 R3 1 kΩ EB− Figure 8 Table 8 Constants for External Components Symbol FET1 FET2 R1 C1 R2 C2 R4 Parts Nch MOS FET Nch MOS FET Chip resistor Chip capacitor Chip resistor Chip capacitor Chip resistor Purpose Discharge control Charge control ESD protection Filter ESD protection Filter ESD protection Typ. 1 kΩ 0.22 µF 1 kΩ 0.22 µF 1 kΩ C3 Chip capacitor Delay time setting 0.22 µF R3 Chip resistor Protection for charger reverse connection R5 Chip resistor 0 V battery charging inhibition 1 kΩ (4.7 MΩ) Min. Max. Remark 300 Ω 1 kΩ 0 µF 1 µF 300 Ω 1 kΩ 0 µF 1 µF = R1 min. = R1 max. Same value as R1 and R2. *1 Attention should be paid to leak 0 µF 1 µF *2 current of C3. Discharge can’t be stopped at less 300 Ω 5 kΩ than 300 Ω when a charger is *3 reverse-connected. R5 should be added when the product has 0 V battery charge (1 MΩ) (10 MΩ) inhibition. Lower resistance *4 increases current consumption. *1. R4 = R1 is required. Overcharge detection voltage increases by R4. For example 10 kΩ (R4) increases overcharge detection voltage by 20 mV. *2. The overcharge detection delay time (tCU), the overdischarge detection delay time (tCD), and the over current detection delay time (tIOV) change with the external capacitor C3. Refer to the “ Electrical Characteristics”. *3. When the resistor R3 is set less than 300 Ω and a charger is reverse-connected, current which exceeds the power dissipation of the package will flow and the IC may break. But excessive R3 causes increase of overcurrent detection voltage 1 (VIOV1). VIOV1 changes to VIOV1 = (R3 + RVSM) / RVSM × VIOV1. For example, 50 kΩ resistor (R3) increases overcurrent detection voltage 1 (VIOV1) from 0.100 V to 0.113 V. *4. A 4.7 MΩ resistor is needed for R5 to inhibit 0 V battery charging. Current consumption increases when the R5 resistance is below 4.7 MΩ. R5 should be connected when the product has 0 V battery charging inhibition. Caution 1. The above constants may be changed without notice. 2. It has not been confirmed whether the operation is normal or not in circuits other than the above example of connection. In addition, the example of connection shown above and the constant do not guarantee proper operation. Perform through evaluation using the actual application to set the constant. 18 Seiko Instruments Inc. BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK S-8232 Series Rev.5.4_00 Precautions • After the overcurrent detection delay, if either one of battery voltages equals the overdischarge detection voltage (VDD1,2) or lower, the overdischarge detection delay time becomes shorter than 10ms (min.). It occurs because capacitor C3 sets all of delay times (refer to the Figure 9) . B attery voltage The battery voltage is equal to or less the overdischarge voltage (VDD) after stopping the overcurrent. V DD 0 V V CC D O pin voltage V SS V M pin voltage V CC V IO V 2 V IO V 1 V SS EB − Load connect The over current delay The over discharge delay The delay time becomes shorter than typical Figure 9 [Cause] When overcurrent detection is released until tIOV1, the capacitor C3 is charged by S-8232 Series. If all battery voltage is lower than VDD1, 2 at that time, charging goes on. So delay time is shorter than typical. [Conclusion] This phenomenon occurs when all battery voltage is nearly equal to the overdischarge voltage (VDD1, 2) after overcurrent detected. It means that the battery capacity is small and those must be charged in the future. Even if the state changes to overdischarge condition, the battery package capacity is same as typical. • When one of the battery voltages is overdischarge detection voltage (VDD1, 2) or lower and the other one becomes higher than the overcharge detection voltage (VCU1, 2), the IC detects the overcharge without the overcharge detection delay time (tCU) (refer to the Figure 10) . V CU B attery v oltage V1 V CD V DU Overcharge detect Overdischarge state V DD V CU B attery v oltage V2 V CD V DU V DD V CC C O pin v oltage V SS EB− D elay tim e = 0 Charger connected Figure 10 [Cause] It is same as the overdischarge detection under the overcurrent condition. It occurs because capacitor C3 sets all of delay times. [Conclusion] This phenomenon occurs when one battery voltage is lower than overdischarge voltage (VDD1, 2) and batteries are charged by charger. Since voltage difference between two batteries is large in this situation, the S-8232 Series immediately stops the charging of the other battery to reduce voltage difference. This action improves the safety of a battery pack and dose not do any harm to the pack. Seiko Instruments Inc. 19 BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK S-8232 Series Rev.5.4_00 • After the overcurrent detection, the load was connected for a long time, even if one of the battery voltage became lower than overdischarge detection voltage (VDD1, 2), the IC can’t detects the overdischarge as long as the load is connected. Therefore the IC’s current consumption at the one of the battery voltage is lower than the overdischarge detection voltage is same as normal condition current consumption (IOPE) (refer to the Figure 11). The battery voltage is less than the overdischarge detection voltage, by self current consum ption B attery voltage VDD 0 V C urrent consum ption D O pin voltage IO P E A s long as the load is connected, the IC ’s current is sam e as norm al current consum ption (I O P E ) IP D N 0 A VCC V SS V M pin voltage V CC V IO V 2 V IO V 1 V SS E B− Load connect The over current delay Long haul load connected Figure 11 [Cause] The reason is as follows. If the overcurrent detection and overdischarge detection occur at same time, the overcurrent detection takes precedence the overdischarge detection. As long as the IC detects overcurrent, the IC can’t detect overdischarge. [Conclusion] If the load is taken off at least one time, the overcurrent is released and the overdischarge detection works. Unless keeping the IC with load for a long time, the reduction of battery voltage will be neglected, because of the IC’s current consumption (typ. 7.5 µA) is small. • Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in electrostatic protection circuit. • SII claims no responsibility for any and all disputes arising out of or in connection with any infringement of the products including this IC upon patents owned by a third party. 20 Seiko Instruments Inc. BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK S-8232 Series Rev.5.4_00 Typical Characteristics 1. Detection Voltage Temperature Characteristics Overcharge detection voltage1 vs. temperature 4.3 -20 0 20 40 60 80 VCU2 = 4.30 [V] 4.4 VCU2 [V] VCU1 [V] 4.4 4.2 -40 Overcharge detection voltage2 vs. temperature VCU1 = 4.30 [V] 4.3 4.2 -40 100 -20 0 Overcharge release voltage1 vs. temperature 4 20 80 100 40 60 80 VCD2 = 4.00 [V] 4.1 VCD2 [V] VCD1 [V] 4.1 0 60 Overcharge release voltage2 vs. temperature VCD1 = 4.00 [V] -20 40 Ta [°C] Ta [°C] 3.9 -40 20 4 3.9 -40 100 -20 0 20 40 60 80 100 Ta [°C] Ta [°C] Auxiliary overcharge detection voltage1 vs. temperature Auxiliary overcharge detection voltage2 vs. temperature VCUaux1 = 5.375 [V] 5.35 5.25 -40 -20 0 20 40 60 80 100 VCUaux2 = 5.375 [V] 5.45 VCUaux2 [V] VCUaux1 [V] 5.45 5.35 5.25 -40 Ta [°C] -20 0 20 40 60 80 100 Ta [°C] Seiko Instruments Inc. 21 BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK S-8232 Series Overdischarge detection voltage1 vs. temperature 2 1.9 -40 VDD2 = 2.00 [V] 2.1 VDD2 [V] VDD1 [V] Overdischarge detection voltage2 vs. temperature VDD1 = 2.00 [V] 2.1 Rev.5.4_00 2 1.9 -20 0 20 40 60 80 100 -40 -20 0 20 Ta [°C] 80 100 Overdischarge release voltage1 vs. temperature VDU1 = 2.60 [V] 2.6 VDU2 = 2.60 [V] 2.7 VDU2 [V] VDU1 [V] 60 Ta [°C] Overdischarge release voltage1 vs. temperature 2.7 40 2.5 2.6 2.5 -40 -20 0 20 40 60 80 100 -40 -20 0 20 Ta [°C] 60 80 100 Ta [°C] Overcurrent1 detection voltage vs. temperature Overcurrent1 detection voltage vs. temperature VIOV1 = 0.1 [V] 0.12 40 VIOV2 = 1.20 [V] (VCC reference) -1.10 VIOV2 [V] VIOV1 [V] -1.15 0.10 0.08 -40 -1.20 -1.25 -1.30 -20 0 20 40 60 80 100 Ta [°C] 22 -40 -20 0 20 40 Ta [°C] Seiko Instruments Inc. 60 80 100 BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK S-8232 Series Rev.5.4_00 2. Current Consumption Temperature Characteristics Current consumption vs. temperature in normal mode 15 VCC = 3.0 [V] 100 10 IPDN [nA] IOPE [µA] Current consumption vs. temperature in power-down mode VCC = 7.2 [V] 5 0 -40 -20 0 20 40 60 80 100 50 0 Ta [°C] -40 -20 0 20 40 60 80 100 Ta [°C] 3. Delay Time Temperature Characteristics Overcharge detection1 time vs. temperature 1 0.5 -40 -20 0 20 40 60 80 C3 = 0.22 [µF] 150 TDD [ms] 1.5 tCU [s] Overcharge detection1 time vs. temperature C3 = 0.22 [µF] 100 50 -40 100 Ta [°C] -20 0 20 40 60 80 100 Ta [°C] Overcurrent1 detection time vs. temperature C3 = 0.22 [µF] 12 tIOV1 [ms] 11 10 9 8 7 -40 -20 0 20 40 Ta [°C] 60 80 100 Seiko Instruments Inc. 23 +0.3 3.00 -0.2 8 5 1 4 0.17±0.05 0.2±0.1 0.65 No. FT008-A-P-SD-1.1 TITLE TSSOP8-E-PKG Dimensions FT008-A-P-SD-1.1 No. SCALE UNIT mm Seiko Instruments Inc. 4.0±0.1 2.0±0.05 ø1.55±0.05 0.3±0.05 +0.1 8.0±0.1 ø1.55 -0.05 (4.4) +0.4 6.6 -0.2 1 8 4 5 Feed direction No. FT008-E-C-SD-1.0 TITLE TSSOP8-E-Carrier Tape FT008-E-C-SD-1.0 No. SCALE UNIT mm Seiko Instruments Inc. 13.4±1.0 17.5±1.0 Enlarged drawing in the central part ø21±0.8 2±0.5 ø13±0.5 No. FT008-E-R-SD-1.0 TSSOP8-E-Reel TITLE No. FT008-E-R-SD-1.0 SCALE QTY. UNIT mm Seiko Instruments Inc. 3,000 • • • • • • The information described herein is subject to change without notice. Seiko Instruments Inc. is not responsible for any problems caused by circuits or diagrams described herein whose related industrial properties, patents, or other rights belong to third parties. The application circuit examples explain typical applications of the products, and do not guarantee the success of any specific mass-production design. When the products described herein are regulated products subject to the Wassenaar Arrangement or other agreements, they may not be exported without authorization from the appropriate governmental authority. Use of the information described herein for other purposes and/or reproduction or copying without the express permission of Seiko Instruments Inc. is strictly prohibited. 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