Rev.4.1_01 BATTERY PROTECTION IC FOR 1- CELL PACK S-8241 Series The S-8241 Series is a series of lithium-ion/lithium polymer rechargeable battery protection ICs incorporating high-accuracy voltage detection circuits and delay circuits. These ICs are suitable for protection of single-cell lithium ion/lithium polymer battery packs from overcharge, overdischarge and overcurrent. Features (1) Internal high-accuracy voltage detection circuit * Overcharge detection voltage: 3.9 V to 4.4 V (5 mV-step) Accuracy of 25 mV(+25C) and 30 mV(-5C to +55C) * Overcharge release voltage 3.8 V to 4.4 V *1 Accuracy of 50 mV *1. Overcharge release voltage = Overcharge detection voltage - Overcharge hysteresis The overcharge hysteresis can be selected in the range 0.0, or 0.1 to 0.4 V in 50mV steps. (However, selection "Overcharge release voltage<3.8 V" is enabled.) * Overdischarge detection voltage: * Overdischarge release voltage: 2.0 V to 3.0 V (100 mV-step) Accuracy of 80 mV 2.0 V to 3.4 V *2 Accuracy of 100 mV *2. Overdischarge release voltage = Overdischarge detection voltage + Overdischarge hysteresis The overdischarge hysteresis can be selected in the range 0.0 to 0.7 V in 100mV steps. (However, selection "Overdischarge release voltage>3.4 V" is enabled.) * Overcurrent 1 detection voltage: 0.05 V to 0.3 V (5 mV-step) Accuracy of 20 mV * Overcurrent 2 detection voltage: 0. 5 V (fixed) Accuracy of 100 mV (2) A high voltage withstand device is used for charger connection pins (VM and CO pins: Absolute maximum rating = 26 V) (3) Delay times (overcharge: tCU; overdischarge: tDL; overcurrent 1: tlOV1; overcurrent 2: tlOV2) are generated by an internal circuit. (External capacitors are unnecessary.) Accuracy of 30 % (4) Internal three-step overcurrent detection circuit (overcurrent 1, overcurrent 2, and load short-circuiting) (5) Either the 0 V battery charging function or 0 V battery charge inhibiting function can be selected. (6) Products with and without a power-down function can be selected. (7) Charger detection function and abnormal charge current detection function * The overdischarge hysterisis is released by detecting a negative VM pin voltage (typ. -1.3 V). (Charger detection function) * If the output voltage at DO pin is high and the VM pin voltage becomes equal to or lower than the charger detection voltage (typ. -1.3 V), the output voltage at CO pin goes low. (Abnormal charge current detection function) (8) Low current consumption * Operation: 3.0 A typ. 5.0 A max. * Power-down mode: 0.1 A max. (9) Wide operating temperature range: -40 to +85 C (10) Small package SOT-23-5, 5-Pin SON(A) Applications * Lithium-ion rechargeable battery packs * Lithium- polymer rechargeable battery packs Packages Package name SOT-23-5 5-Pin SON(A) Package MP005-A PN005-A Drawing code Tape MP005-A PN005-A Seiko Instruments Inc. Reel MP005-A PN005-A 1 BATTERY PROTECTION IC FOR 1-CELL PACK S-8241 Series Rev.4.1_01 Block Diagram Delay circuit Clock generation circuit VDD DO Counter circuit Load shortcircuiting detection circuit - + Level conversion circuit 0V battery charging circuit 0V battery charge inhibition circuit Overcharge detection comparator Overdischarge detection comparator + + - CO RCOL RVMD - Charger detection circuit The overdischarge hysterisis is released when a charger is detected. Overcurrent 1 detection comparator VM RVMS + - Overcurrent 2 detection comparator VSS Remark The diodes in the IC are parasitic diodes. Figure 1 Block Diagram Product Code Structure 1. Product Name S-8241A xx xx - xxx xx IC direction in tape specifications*1 T2 : SOT-23-5 TF : 5-Pin SON(A) Product name (abbreviation)*2 Package name (abbreviation) MC : SOT-23-5 PN : 5-Pin SON(A) Serial code Assigned from BA to ZZ in alphabetical order *1 Refer to the taping specifications at the end of this book. *2 Refer to the product name list. 2 Seiko Instruments Inc. BATTERY PROTECTION IC FOR 1-CELL PACK S-8241 Series Rev.4.1_01 2. Product Name List Overcharge detection voltage [VCU] Overcharge release voltage [VCL] Overdischarge detection voltage [VDL] Overdischarge release voltage [VDU] Overcurrent 1 detection voltage [VIOV1] 0V battery charging function Delay time combi*1 nation Power down function S-8241ABAMC-GBA-T2 4.275 V 4.075 V 2.3 V 2.9 V 0.100 V Unavailable (1) Available S-8241ABBMC-GBB-T2 4.280 V 3.980 V 2.3 V 2.4 V 0.125 V Available (2) Available S-8241ABCMC-GBC-T2 4.350 V 4.100 V 2.3 V 2.8 V 0.075 V Unavailable (1) Available 4.275 V 4.175 V 2.3 V 2.4 V 0.100 V Available (1) Available 4.295 V 4.095 V 2.3 V 3.0 V 0.200 V Unavailable (1) Available Model No./Item S-8241ABDMC-GBD-T2 S-8241ABDPN-KBD-TF S-8241ABEMC-GBE-T2 S-8241ABFMC-GBF-T2 4.325 V 4.075 V 2.5 V 2.9 V 0.100 V Unavailable (1) Available S-8241ABGMC-GBG-T2 4.200 V 4.100 V 2.3 V 3.0 V 0.100 V Unavailable (1) Available S-8241ABHMC-GBH-T2 4.325 V 4.125 V 2.3 V 2.3 V 0.100 V Available (1) Available S-8241ABIMC-GBI-T2 4.280 V 4.080 V 2.3 V 2.3 V 0.160 V Unavailable (1) Available S-8241ABKMC-GBK-T2 4.325 V 4.075 V 2.5 V 2.9 V 0.150 V Unavailable (1) Available S-8241ABLMC-GBL-T2 4.320 V 4.070 V 2.5 V 2.9 V 0.100 V Unavailable (1) Available S-8241ABNPN-KBN-TF 4.350 V 4.050 V 2.35 V 2.65 V 0.150 V Available (1) Available S-8241ABOMC-GBO-T2 4.350 V 4.15 V 2.3 V 3.0 V 0.150 V Available (2) Available S-8241ABPMC-GBP-T2 4.350 V 4.15 V 2.3 V 3.0 V 0.200 V Available (2) Available S-8241ABQMC-GBQ-T2 4.280 V 4.080 V 2.3 V 2.3 V 0.130 V Unavailable (1) Available S-8241ABSPN-KBS-TF 4.350 V 4.150 V 2.35 V 2.65 V 0.200 V Available (2) Available S-8241ABTPN-KBT-TF 4.300 V 4.100 V 2.3 V 2.3 V 0.100 V Available (1) Available S-8241ABUMC-GBU-T2 4.200 V 4.100 V 2.3 V 2.3 V 0.150 V Unavailable (1) Available S-8241ABVMC-GBV-T2 4.295 V 4.095 V 2.3 V 2.3 V 0.130 V Available (1) Available S-8241ABWMC-GBW-T2 4.280 V 4.080 V 2.3 V 2.3 V 0.130 V Unavailable (3) Available 4.350 V 4.000 V 2.6 V 3.3 V 0.200 V Unavailable (1) Available S-8241ABYMC-GBY-T2 4.220 V 4.220 V 2.3 V 2.3 V 0.200 V Available (3) Available S-8241ABZPN-KBZ-TF 4.275 V 4.075 V 2.3 V 2.4 V 0.140 V Available (1) Available 4.280 V 4.080 V 2.3 V 2.3 V 0.200 V Available (1) Available S-8241ACBMC-GCB-T2 4.300 V 4.100 V 2.3 V 2.3 V 0.150 V Available (1) Available S-8241ACDMC-GCD-T2 4.275 V 4.075 V 2.3 V 2.3 V 0.100 V Unavailable (4) Available S-8241ACEMC-GCE-T2 4.295 V 4.095 V 2.3 V 2.3 V 0.080 V Available (1) Available S-8241ACFMC-GCF-T2 4.295 V 4.095 V 2.3 V 2.3 V 0.090 V Available (1) Available 4.295 V 4.095 V 2.3 V 2.3 V 0.060 V Available (1) Available S-8241ACHMC-GCH-T2 4.280 V 4.080 V 2.6 V 2.6 V 0.200 V Available (1) Available S-8241ACIMC-GCI-T2 4.350 V 4.150 V 2.05 V 2.75 V 0.200 V Available (2) Available S-8241ACJPN-KCJ-TF 4.300 V 4.100 V 2.3 V 2.3 V 0.120 V Available (1) Available S-8241ACKMC-GCK-T2 4.350 V 4.150 V 2.0 V 2.0 V 0.200 V Available (2) Available S-8241ACLMC-GCL-T2 4.200 V 4.200 V 2.5 V 3.0 V 0.100 V Available (1) Available 4.350 V 4.150 V 2.1 V 2.2 V 0.200 V Available (2) Available S-8241ABXMC-GBX-T2 S-8241ABXPN-KBX-TF S-8241ACAMC-GCA-T2 S-8241ACAPN-KCA-TF S-8241ACGMC-GCG-T2 S-8241ACGPN-KCG-TF S-8241ACNMC-GCN-T2 S-8241ACNPN-KCN-TF Seiko Instruments Inc. 3 BATTERY PROTECTION IC FOR 1-CELL PACK S-8241 Series Model No./Item Overcharge detection voltage [VCU] Overcharge release voltage [VCL] Overdischarge detection voltage [VDL] Rev.4.1_01 Overdischarge release voltage [VDU] Overcurrent 1 detection voltage [VIOV1] 0V battery charging function Delay time combi*1 nation Power down function Unavailable S-8241ACOMC-GCO-T2 4.100 V 3.850 V 2.5 V 2.9 V 0.150 V Unavailable (1) S-8241ACPMC-GCP-T2 4.325 V 4.075 V 2.5 V 2.9 V 0.150 V Unavailable (1) Unavailable S-8241ACQMC-GCQ-T2 4.275 V 4.175 V 2.3 V 2.4 V 0.100 V Available (1) Unavailable S-8241ACRMC-GCR-T2 4.350 V 4.150 V 2.3 V 3.0 V 0.100 V Available (1) Unavailable S-8241ACSMC-GCS-T2 4.180 V 3.930 V 2.5 V 2.9 V 0.150 V Unavailable (1) Unavailable S-8241ACTMC-GCT-T2 4.100 V 4.000 V 2.5 V 2.9 V 0.150 V Unavailable (1) Unavailable S-8241ACUMC-GCU-T2 4.180 V 4.080 V 2.5 V 2.9 V 0.150 V Unavailable (1) Unavailable S-8241ACXMC-GCX-T2 4.275 V 4.075 V 2.5 V 2.9 V 0.150 V Unavailable (1) Unavailable S-8241ACYMC-GCY-T2 4.275 V 4.075 V 2.6 V 2.9 V 0.100 V Unavailable (1) Unavailable S-8241ACZPN-KCZ-TF 4.350 V 4.150 V 2.7 V 2.7 V 0.200 V Unavailable (2) Available S-8241ADAMC-GDA-T2 4.350 V 4.150 V 2.3 V 3.0 V 0.100 V Available (1) Available 2.3 V 0.250 V Unavailable (2) Available S-8241ADBPN-KDB-TF 4.280 V 4.080 V 2.3 V *1. The delay time combination (1), (2), (3), (4) is as follows. Delay time combination Overcharge detection delay time Overdischarge detection delay time Overcurrent 1 detection delay time (1) 1.0 s 125 ms 8 ms (2) 0.125 s 31 ms 16 ms (3) 0.25 s 125 ms 8 ms (4) 2.0 s 125 ms 8 ms It is possible to change the detection voltage for products other than those listed above. Also, delay time can be changed within the following range. For details, please contact our sales office. Delay time Symbol Optional range tCU 0.25 s 0.5 s 1.0 s Choose from the list at left. Overdischarge detection delay time tDL 31 ms 62.5 ms 125 ms Choose from the list at left. Overcurrent 1 detection delay time tlOV1 4 ms 8 ms 16 ms Choose from the list at left. Shaded boxes indicate standard values. 4 Remarks Overcharge detection delay time Seiko Instruments Inc. BATTERY PROTECTION IC FOR 1-CELL PACK S-8241 Series Rev.4.1_01 Pin Configurations SOT-23-5 Top view 5 4 1 2 Pin No. Symbol Pin Description 1 VM 2 VDD Positive power input pin 3 VSS Negative power input pin 4 DO FET gate connection pin for discharge control (CMOS output) 5 CO Pin No. Symbol 1 VM 2 VDD 3 CO 4 DO Voltage detection pin between VM and VSS (Overcurrent detection pin) FET gate connection pin for charge control (CMOS output) 3 Figure 2 5-Pin SON(A) Top view 5 4 1 2 3 Pin Description Voltage detection pin between VM and VSS (Overcurrent detection pin) Positive power input pin FET gate connection pin for charge control (CMOS output) FET gate connection pin for discharge control (CMOS output) 5 VSS Negative power input pin Remark Pin assignment of SOT-23-5 and of 5-Pin SON(A) are different. Figure 3 Absolute Maximum Ratings (Ta = 25C unless otherwise specified) Item Symbol Applicable pin Rating Unit *1 Input voltage between VDD and VSS VDS VDD VSS -0.3 to VSS +12 V VM Input pin voltage VVM VM VDD -26 to VDD +0.3 V CO output pin voltage VCO CO VVM -0.3 to VDD +0.3 V DO output pin voltage VDO DO VSS -0.3 to VDD +0.3 V Power dissipation SOT-23-5 PD 250 mW - 5-Pin SON(B) 150 Operation ambient temperature Topr -40 to +85 C - Storage temperature Tstg -40 to +125 C - *1. Do not apply pulse-like noise of s order exceeding the above input voltage (VSS + 12 V). The noise causes damage to the IC. 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. Seiko Instruments Inc. 5 BATTERY PROTECTION IC FOR 1-CELL PACK S-8241 Series Rev.4.1_01 Electrical Characteristics (1) Other than detection delay time (25C) Item Symbol Measurement conditions Remarks Min. (Ta = 25C unless otherwise specified) MeasureTyp. Max. Unit ment circuit DETECTION VOLTAGE VCU 1 VCU VCU+0.025 V 1 VCU-0.025 Overcharge detection voltage - *1 VCU=3.9 to 4.4 V, 5 mV Step VCU VCU+0.030 VCU-0.030 Ta= -5C to 55C Overcharge release voltage VCL 1 VCL-0.050 VCL VCL+0.050 V 1 When VCL VCU VCU-VCL=0 to 0.4 V, 50mV Step VCL-0.025 VCL VCL+0.025 When VCL = VCU Overdischarge detection voltage VDL 1 VDL-0.080 VDL VDL+0.080 V 1 - VDL=2.0 to 3.0 V, 100mV Step Overdischarge release voltage VDU-0.100 VDU 1 VDU VDU+0.100 When VDU VDL VDU-VDL=0 to 0.7 V, 100mV Step VDU-0.080 VDU VDU+0.080 V 1 When VDU = VDL Overcurrent 1 detection voltage VIOV1-0.02 VIOV1+0.02 VIOV1 V 1 VIOV1 2 - VIOV1=0.05 to 0.3V, 5mV Step 0 0 Overcurrent 2 detection voltage VIOV2 2 0.4 0.5 0.6 V 1 - Load short-circuiting detection VSHORT 2 VM voltage based on VDD -1.7 -1.3 -0.9 V 1 voltage -2.0 -1.3 -0.6 V 1 Charger detection voltage VCHA 3 - Overcharge detection voltage TCOE1 -0.5 0 0.5 - Ta= -5C to 55C mV/C - temperature factor *1 Overcurrent 1 detection voltage TCOE2 -0.1 0 0.1 - Ta= -5C to 55C mV/C - temperature factor *1 INPUT VOLTAGE, OPERATING VOLTAGE Input voltage between VDD and VDS1 absolute maximum rating -0.3 12 V - - - VSS Input voltage between VDD and VDS2 absolute maximum rating -0.3 26 V - - - VM Operating voltage between VDD Internal circuit operating VDSOP1 1.5 8 V - - - and VSS voltage Operating voltage between VDD Internal circuit operating VDSOP2 1.5 24 V - - - and VM voltage CURRENT CONSUMPTION Power-down function available Current consumption during I OPE 1 4 VDD=3.5V, VVM=0 V 1.0 3.0 5.0 A normal operation Current consumption at power I PDN 4 VDD=VVM =1.5 V 0.1 1 - - A down CURRENT CONSUMPTION Power-down function unavailable Current consumption during I OPE 4 VDD=3.5 V, VVM=0 V 1.0 3.0 5.0 1 A normal operation Overdischarge current I OPED 1 4 VDD=VVM =1.5 V 1.0 2.0 3.5 A consumption OUTPUT RESISTANCE CO pin H resistance RCOH 6 VCO=3.0 V,VDD=3.5 V,VVM=0 V 0.1 2 10 1 k CO pin L resistance RCOL 6 VCO=0.5 V,VDD=4.5 V,VVM=0 V 150 600 2400 1 k DO pin H resistance RDOH 7 VDO=3.0 V,VDD=3.5 V,VVM=0 V 0.1 1.3 6.0 1 k DO pin L resistance RDOL 7 VDO=0.5 V,VDD=VVM=1.8 V 0.1 0.5 2.0 1 k VM INTERNAL RESISTANCE Internal resistance between VM RVMD 5 VDD=1.8 V, VVM =0 V 100 300 900 1 k and VDD Internal resistance between VM RVMS 5 VDD=VVM =3.5 V 50 100 150 1 k and VSS 0 V BATTERY CHARGING FUNCTION The 0 V battery function is either "0 V battery charging function" or "0 V battery charge inhibiting function" depending upon the product type. 0 V battery charge starting V0CHA 10 0 V battery charging Available 0.0 0.8 1.5 V 1 charger voltage 0 V battery charge inhibiting 0 V battery charging V0INH 11 0.6 0.9 1.2 V 1 battery voltage Unavailable *1. Since products are not screened at high and low temperatures, the specification for this temperature range is guaranteed by design, not tested in production. 6 Seiko Instruments Inc. BATTERY PROTECTION IC FOR 1-CELL PACK S-8241 Series Rev.4.1_01 Electrical Characteristics (2) Other than detection delay time (-40 to 85C*1) Item Symbol Measurement conditions Remarks (Ta = (-40 to 85C*1)unless otherwise specified) MeasureMin. Typ. Max. Unit ment circuit DETECTION VOLTAGE Overcharge detection voltage VCU VCU-0.055 VCU 1 VCU+0.040 V 1 - VCU=3.9 to 4.4 V, 5mV Step Overcharge release voltage VCL-0.095 VCL 1 VCL VCL+0.060 V 1 When VCL VCU VCU-VCL=0 to 0.4 V, 50mV Step VCL-0.055 VCL VCL+0.040 When VCL = VCU Overdischarge detection voltage VDL 1 VDL-0.120 VDL VDL+0.120 V 1 - VDL=2.0 to 3.0 V, 100mV Step Overdischarge release voltage VDU-0.140 VDU VDU 1 VDU+0.140 V 1 When VDU VDL VDU-VDL=0 to 0.7 V, 100mV Step VDU-0.120 VDU VDU+0.120 When VDU = VDL Overcurrent 1 detection voltage VIOV1-0.02 VIOV1 VIOV1+0.026 2 V 1 VIOV1 - VIOV1=0.05 to 0.3V, 5mV Step 6 0.37 0.5 0.63 V 1 Overcurrent 2 detection voltage VIOV2 2 - Load short-circuiting detection VSHORT 2 VM voltage based on VDD -1.9 -1.3 -0.7 V 1 voltage -2.2 -1.3 -0.4 V 1 Charger detection voltage VCHA 3 - Overcharge detection voltage TCOE1 -0.7 0 0.7 - Ta= -40C to 85C mV/C - temperature factor *1 Overcurrent 1 detection voltage TCOE2 -0.2 0 0.2 - Ta= -40C to 85C mV/C - temperature factor *1 INPUT VOLTAGE, OPERATING VOLTAGE Input voltage between VDD and VDS1 absolute maximum rating -0.3 12 V - - - VSS Input voltage between VDD and VDS2 absolute maximum rating -0.3 26 V - - - VM Operating voltage between VDD Internal circuit operating VDSOP1 1.5 8 V - - - and VSS voltage Operating voltage between VDD Internal circuit operating VDSOP2 1.5 24 V - - - and VM voltage CURRENT CONSUMPTION Power-down function available Current consumption during I OPE 4 VDD=3.5 V, VVM=0 V 0.7 3.0 6.0 1 A normal operation Current consumption at power I PDN 4 VDD=VVM =1.5 V 0.1 1 - - A down CURRENT CONSUMPTION Power-down function unavailable Current consumption during I OPE 4 VDD=3.5 V, VVM=0 V 0.7 3.0 6.0 1 A normal operation Overdischarge current I OPED 1 4 VDD=VVM =1.5 V 0.6 2.0 4.5 A consumption OUTPUT RESISTANCE CO pin H resistance RCOH 6 VCO=3.0 V,VDD=3.5 V,VVM=0 V 0.07 2 13 1 k CO pin L resistance RCOL 6 VCO=0.5 V,VDD=4.5 V,VVM=0 V 100 600 3500 1 k DO pin H resistance RDOH 7 VDO=3.0 V,VDD=3.5 V,VVM=0 V 0.07 1.3 7.3 1 k DO pin L resistance RDOL 7 VDO=0.5 V,VDD=VVM=1.8 V 0.07 0.5 2.5 1 k VM INTERNAL RESISTANCE Internal resistance between VM RVMD 5 VDD=1.8 V, VVM =0 V 78 300 1310 1 k and VDD Internal resistance between VM RVMS 5 VDD=VVM =3.5 V 39 100 220 1 k and VSS 0 V BATTERY CHARGING FUNCTION The 0 V battery function is either "0 V battery charging function" or "0 V battery charge inhibiting function" depending upon the product type. 0 V battery charge starting V0CHA 10 0 V battery charging Available 0.0 0.8 1.7 V 1 charger voltage 0 V battery charge inhibiting 0 V battery charging V0INH 11 0.4 0.9 1.4 V 1 battery voltage Unavailable *1. Since products are not screened at high and low temperatures, the specification for this temperature range is guaranteed by design, not tested in production. Seiko Instruments Inc. 7 BATTERY PROTECTION IC FOR 1-CELL PACK S-8241 Series Rev.4.1_01 Electrical Characteristics (3) Detection delay time (25C) Item DELAY TIME (1) Overcharge detection delay time Overdischarge detection delay time Overcurrent 1 detection delay time Overcurrent 2 detection delay time Load short-circuiting detection delay time DELAY TIME (2) Overcharge detection delay time Overdischarge detection delay time Overcurrent 1 detection delay time Overcurrent 2 detection delay time Load short-circuiting detection delay time DELAY TIME (3) Overcharge detection delay time Overdischarge detection delay time Overcurrent 1 detection delay time Overcurrent 2 detection delay time DELAY TIME (4) Overcharge detection delay time Overdischarge detection delay time Overcurrent 1 detection delay time Overcurrent 2 detection delay time Load short-circuiting detection delay time 8 (Ta = 25C unless otherwise specified) Measurement Typ. Max. Unit circuit Measurement conditions Remarks Min. 8 8 9 9 9 - - - - - 0.7 87.5 5.6 1.4 - 1.0 125 8 2 10 1.3 162.5 10.4 2.6 50 s ms ms ms s 1 1 1 1 1 tSHORT 8 8 9 9 9 - - - - - 87.5 21 11 1.4 - 125 31 16 2 10 162.5 41 21 2.6 50 ms ms ms ms s 1 1 1 1 1 tCU tDL tlOV1 tlOV2 8 8 9 9 - - - - 0.175 87.5 5.6 1.4 0.25 125 8 2 0.325 162.5 10.4 2.6 s ms ms ms 1 1 1 1 tCU tDL tlOV1 tlOV2 8 8 9 9 9 - - - - - 1.4 87.5 5.6 1.4 - 2.0 125 8 2 10 2.6 162.5 10.4 2.6 50 s ms ms ms s 1 1 1 1 1 Symbol tCU tDL tlOV1 tlOV2 tSHORT tCU tDL tlOV1 tlOV2 tSHORT Seiko Instruments Inc. BATTERY PROTECTION IC FOR 1-CELL PACK S-8241 Series Rev.4.1_01 Electrical Characteristics (4) Detection delay time (-40 to 85C*1) Item Symbol Measurement conditions Remarks (Ta = -40 to 85C *1 unless otherwise specified) Measurement Min. Typ. Max. Unit circuit DELAY TIME (1) Overcharge detection delay time tCU 8 - 0.55 1.0 1.7 s 1 Overdischarge detection delay time tDL 8 - 69 125 212 ms 1 Overcurrent 1 detection delay time tIOV1 9 - 4.4 8 14 ms 1 Overcurrent 2 detection delay time tIOV2 9 - 1.1 2 3.4 ms 1 Load short-circuiting detection delay tSHORT 9 - - 10 73 s 1 time DELAY TIME (2) Overcharge detection delay time tCU 8 - 69 125 212 ms 1 Overdischarge detection delay time tDL 8 - 17 31 53 ms 1 Overcurrent 1 detection delay time tIOV1 9 - 9 16 27 ms 1 Overcurrent 2 detection delay time tIOV2 9 - 1.1 2 3.4 ms 1 Load short-circuiting detection delay tSHORT 9 - - 10 73 s 1 time DELAY TIME (3) Overcharge detection delay time tCU 8 - 0.138 0.25 0.425 s 1 Overdischarge detection delay time tDL 8 - 69 125 212 ms 1 Overcurrent 1 detection delay time tIOV1 9 - 4.4 8 14 ms 1 Overcurrent 2 detection delay time tIOV2 9 - 1.1 2 3.4 ms 1 Load short-circuiting detection delay tSHORT 9 - - 10 73 s 1 time DELAY TIME (4) Overcharge detection delay time tCU 8 - 1.1 2.0 3.4 s 1 Overdischarge detection delay time tDL 8 - 69 125 212 ms 1 Overcurrent 1 detection delay time tIOV1 9 - 4.4 8 14 ms 1 Overcurrent 2 detection delay time tIOV2 9 - 1.1 2 3.4 ms 1 Load short-circuiting detection delay tSHORT 9 - - 10 73 s 1 time *1. Since products are not screened at high and low temperatures, the specification for this temperature range is guaranteed by design, not tested in production. Seiko Instruments Inc. 9 BATTERY PROTECTION IC FOR 1-CELL PACK S-8241 Series Rev.4.1_01 Measurement Circuits Unless otherwise specified, the output voltage levels "H" and "L" at CO and DO pins are judged by the threshold voltage (1.0 V) of a Nch FET. Judge the CO pin level with respect to VVM and the DO pin level with respect to VSS. Voltages V1 to V4 are shown in the figure 4. (1) Measurement Condition 1, Measurement Circuit 1 Overcharge detection voltage, Overcharge release voltage, Overdischarge detection voltage, Overdischarge release voltage The overcharge detection voltage (VCU) is defined by the voltage between VDD and VSS at which VCO goes L from H when the voltage V1 is gradually increased from the normal condition V1=3.5 V and V2=0 V. The overcharge release voltage (VCL) is defined by the voltage between VDD and VSS at which VCO goes H from L when the voltage V1 is then gradually decreased. Gradually decreasing the voltage V1, the overdischarge detection voltage (VDL) is defined by the voltage between VDD and VSS at which VDO goes L from H. The overdischarge release voltage (VDU) is defined by the voltage between VDD and VSS at which VDO goes H from L when the voltage V1 is then gradually increased. (2) Measurement Condition 2, Measurement Circuit 1 Overcurrent 1 detection voltage, Overcurrent 2 detection voltage, Load short-circuiting detection voltage The overcurrent 1 detection voltage (VIOV1) is defined by the voltage between VDD and VSS at which VDO goes L from H when the voltage V2 is gradually increased from the normal condition V1=3.5 V and V2=0 V. The overcurrent 2 detection voltage (VIOV2) is defined by the voltage between VDD and VSS at which VDO goes L from H when the voltage V2 is increased at the speed between 1 ms and 4 ms from the normal condition V1=3.5 V and V2=0 V. The load short-circuiting detection voltage (VSHORT) is defined by the voltage between VDD and VSS at which VDO goes L from H when the voltage V2 is increased at the speed between 1 s and 50 s from the normal condition V1=3.5 V and V2=0 V. (3) Measurement Condition 3, Measurement Circuit 1 Charger detection voltage, (=abnormal charge current detection voltage) * Applied only for products with overdischarge hysteresis Set V1=1.8 V and V2=0 V under overdischarge condition. Increase V1 gradually, set V1=(VDU+VDL)/2 (within overdischarge hysteresis, overdischarge condition), then decrease V2 from 0 V gradually. The voltage between VM and VSS at which VDO goes H from L is the charger detection voltage (VCHA). * Applied only for products without overdischarge hysteresis Set V1=3.5 V and V2=0 V under normal condition. Decrease V2 from 0 V gradually. The voltage between VM and VSS at which VCO goes L from H is the abnormal charge current detection voltage. The abnormal charge current detection voltage has the same value as the charger detection voltage (VCHA). 10 Seiko Instruments Inc. Rev.4.1_01 BATTERY PROTECTION IC FOR 1-CELL PACK S-8241 Series (4) Measurement Condition 4, Measurement Circuit 1 Normal operation current consumption, Power-down current consumption, Overdischarge current consumption Set V1=3.5 V and V2=0 V under normal condition. The current IDD flowing through VDD pin is the normal operation consumption current (IOPE). * For products with power-down function Set V1=V2=1.5 V under overdischarge condition. The current IDD flowing through VDD pin is the power-down current consumption (IPDN). * For products without power-down function Set V1=V2=1.5 V under overdischarge condition. The current IDD flowing through VDD pin is the overdischarge current consumption (IOPED). (5) Measurement Condition 5, Measurement Circuit 1 Internal resistance between VM and VDD, Internal resistance between VM and VSS Set V1=1.8 V and V2=0 V under overdischarge condition. Measure current IVM flowing through VM pin. 1.8V/|IVM| gives the internal resistance (RVMD) between VM and VDD. Set V1=V2=3.5 V under overcurrent condition. Measure current IVM flowing through VM pin. 3.5 V/|IVM| gives the internal resistance (RVMS) between VM and VSS. (6) Measurement Condition 6, Measurement Circuit 1 CO pin H resistance, CO pin L resistance Set V1=3.5 V, V2=0 V and V3=3.0 V under normal condition. Measure current ICO flowing through CO pin. 0.5 V/|ICO| is the CO pin H resistance (RCOH). Set V1=4.5 V, V2=0 V and V3=0.5 V under overcharge condition. Measure current ICO flowing through CO pin. 0.5 V/|ICO| is the CO pin L resistance (RCOL). (7) Measurement Condition 7, Measurement Circuit 1 DO pin H resistance, DO pin L resistance Set V1=3.5 V, V2=0 V and V4=3.0 V under normal condition. Measure current IDO flowing through DO pin. 0.5V/|IDO| gives the DO pin H resistance (RDOH). Set V1=1.8 V, V2=0 V and V4=0.5 V under overdischarge condition. Measure current IDO flowing through DO pin. 0.5 V/|IDO| gives the DO pin L resistance (RDOL). (8) Measurement Condition 8, Measurement Circuit 1 Overcharge detection delay time, Overdischarge detection delay time Set V1=3.5 V and V2=0 V under normal condition. Increase V1 gradually to overcharge detection voltage VCU - 0.2 V and increase V1 to the overcharge detection voltage VCU + 0.2 V momentarily (within 10 s). The time after V1 becomes the overcharge detection voltage until VCO goes "L" is the overcharge detection delay time (tCU). Set V1=3.5 V and V2=0 V under normal condition. Decrease V1 gradually to overdischarge detection voltage VDL + 0.2 V and decrease V1 to the overdischarge detection voltage VDL - 0.2 V momentarily (within 10 s). The time after V1 becomes the overdischarge detection voltage VDL until VDO goes "L" is the overdischarge detection delay time (tDL). Seiko Instruments Inc. 11 BATTERY PROTECTION IC FOR 1-CELL PACK S-8241 Series Rev.4.1_01 (9) Measurement Condition 9, Measurement Circuit 1 Overcurrent 1 detection delay time, Overcurrent 2 detection delay time, Load short-circuiting detection delay time, Abnormal charge current detection delay time Set V1=3.5V and V2=0V under normal condition. Increase V2 from 0 V to 0.35 V momentarily (within 10 s). The time after V2 becomes overcurrent 1 detection voltage (VIOV1) until VDO goes "L" is overcurrent 1 detection delay time (tIOV1). Set V1=3.5 V and V2=0 V under normal condition. Increase V2 from 0 V to 0.7 V momentarily (within 1 s). The time after V2 becomes overcurrent 1 detection voltage (VIOV1) until VDO goes "L" is overcurrent 2 detection delay time (tIOV2). Note: The overcurrent 2 detection delay time starts when the overcurrent 1 is detected, since the delay circuit is common. Set V1=3.5 V and V2=0 V under normal condition. Increase V2 from 0 V to 3.0 V momentarily (within 1 s). The time after V2 becomes the load short-circuiting detection voltage (VSHORT) until VDO goes "L" is the load short-circuiting detection delay time (tSHORT). Set V1=3.5 V and V2=0 V under normal condition. Decrease V2 from 0 V to -2.5 V momentarily (within 10 s). The time after V2 becomes the charger detection voltage (VCHA) until VCO goes "L" is the abnormal charge current detection delay time. The abnormal charge current detection delay time has the same value as the overcharge detection delay time. (10) Measurement Condition 10, Measurement Circuit 1 (Product with 0V battery charging function) 0V battery charge start charger voltage Set V1=V2=0 V and decrease V2 gradually. The voltage between VDD and VM at which VCO goes H (VVM + 0.1 V or higher) is the 0 V battery charge start charger voltage (V0CHA). (11) Measurement Condition 11, Measurement Circuit 1 (Product with 0V battery charge inhibiting function) 0V battery charge inhibiting battery voltage Set V1=0 V and V2=-4 V. Increase V1 gradually. The voltage between VDD and VSS at which VCO goes H (VVM + 0.1 V or higher) is the 0V battery charge inhibiting battery voltage (V0INH). IDD VDD A S-8241 series V1 VSS VM A IVM CO DO V2 IDO V4 A V VDO VCO V COM Measurement circuit 1 Figure 4 12 Seiko Instruments Inc. A ICO V3 Rev.4.1_01 BATTERY PROTECTION IC FOR 1-CELL PACK S-8241 Series Operation Remark Refer to the " Battery Protection IC Connection Example". Normal Condition The S-8241 monitors the voltage of the battery connected to VDD and VSS pins and the voltage difference between VM and VSS pins to control charging and discharging. When the battery voltage is in the range from the overdischarge detection voltage (VDL) to the overcharge detection voltage (VCU), and the VM pin voltage is in the range from the charger detection voltage (VCHA) to the overcurrent 1 detection voltage (VIOV1) (the current flowing through the battery is equal to or lower than a specified value), the IC turns both the charging and discharging control FETs on. This condition is called normal condition and in this condition charging and discharging can be carried out freely. 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 the state continues for the overcurrent detection delay time or longer, the S-8241 turns the discharging control FET off to stop discharging. This condition is called overcurrent condition. (The overcurrent includes overcurrent 1, overcurrent 2, or load short-circuiting.) The VM and VSS pins are shorted internally by the RVMS resistor under the overcurrent condition. When a load is connected, the VM pin voltage equals the VDD voltage due to the load. The overcurrent condition returns to the normal condition when the load is released and the impedance between the EB+ and EB- pins (see the figure 10 for a connection example) becomes higher than the automatic recoverable impedance (see the equation [1] below). When the load is removed, the VM pin goes back to the VSS potential since the VM pin is shorted the VSS pin with the RVMS resistor. Detecting that the VM pin potential is lower than the overcurrent 1 detection voltage (VIOV1), the IC returns to the normal condition. Automatic recoverable impedance = {Battery voltage / (Minimum value of overcurrent 1 detection voltage) 1} x (RVMS maximum value) --- [1] Example: Battery voltage = 3.5 V and overcurrent 1 detection voltage (VIOV1) = 0.1 V Automatic recoverable impedance = (3.5 V / 0.07 V -1) x 200 k = 9.8 M Remark The automatic recoverable impedance varies with the battery voltage and overcurrent 1 detection voltage settings. Determine the minimum value of the open load using the above equation [1] to have automatic recovery from the overcurrent condition work after checking the overcurrent 1 detection voltage setting for the IC. Seiko Instruments Inc. 13 BATTERY PROTECTION IC FOR 1-CELL PACK S-8241 Series Rev.4.1_01 Overcharge Condition When the battery voltage becomes higher than the overcharge detection voltage (VCU) during charging under normal condition and the state continues for the overcharge detection delay time (tCU) or longer, the S-8241 turns the charging control FET off to stop charging. This condition is called the overcharge condition. The overcharge condition is released in the following two cases (c and d) depending on the products with and without overcharge hysteresis: Products with overcharge hysteresis (overcharge detection voltage (VCU) > overcharge release voltage (VCL)) c When the battery voltage drops below the overcharge release voltage (VCL), the S-8241 turns the charging control FET on and returns to the normal condition. d When a load is connected and discharging starts, the S-8241 turns the charging control FET on and returns to the normal condition. The release mechanism is as follows: the discharging current flows through an internal parasitic diode of the charging FET immediately after a load is connected and discharging starts, and the VM pin voltage increases about 0.7 V (Vf voltage of the diode) from the VSS pin voltage momentarily. The IC detects this voltage (being higher than the overcurrent 1 detection voltage) and releases the overcharge condition. Consequently, in the case that the battery voltage is equal to or lower than the overcharge detection voltage (VCU), the IC returns to the normal condition immediately, but in the case the battery voltage is higher than the overcharge detection voltage (VCU), the IC does not return to the normal condition until the battery voltage drops below the overcharge detection voltage (VCU) even if the load is connected. In addition If the VM pin voltage is equal to or lower than the overcurrent 1 detection voltage when a load is connected and discharging starts, the IC does not return to the normal condition. Remark If the battery is charged to a voltage higher than the overcharge detection voltage (VCU) and the battery voltage does not drops below the overcharge detection voltage (VCU) even when a heavy load, which causes an overcurrent, is connected, the overcurrent 1 and overcurrent 2 do not work until the battery voltage drops below the overcharge detection voltage (VCU). Since an actual battery has, however, an internal impedance of several dozens of m, and the battery voltage drops immediately after a heavy load which causes an overcurrent is connected, the overcurrent 1 and overcurrent 2 work. Detection of load short-circuiting works regardless of the battery voltage. Products without overcharge hysteresis (Overcharge detection voltage (VCU) = Overcharge release voltage (VCL)) c When the battery voltage drops below the overcharge release voltage (VCL), the S-8241 turn the charging control FET on and returns to the normal condition. d When a load is connected and discharging starts, the S-8241 turns the charging control FET on and returns to the normal condition. The release mechanism is explained as follows : the discharging current flows through an internal parasitic diode of the charging FET immediately after a load is connected and discharging starts, and the VM pin voltage increases about 0.7 V (Vf voltage of the diode) from the VSS pin voltage momentarily. Detecting this voltage (being higher than the overcurrent 1 detection voltage), the IC increases the overcharge detection voltage about 50 mV, and releases the overcharge condition. Consequently, when the battery voltage is equal to or lower than the overcharge detection voltage (VCU) + 50 mV, the S-8241 immediately returns to the normal condition. But the battery voltage is higher than the overcharge detection voltage (VCU) + 50 mV, the S-8241 does not return to the normal condition until the battery voltage drops below the overcharge detection voltage (VCU) + 50 mV even if a load is connected. If the VM pin voltage is equal to or lower than the overcurrent 1 detection voltage when a load is connected and discharging starts, the S-8241 does not return to the normal condition. Remark If the battery is charged to a voltage higher than the overcharge detection voltage (VCU) and the battery voltage does not drop below the overcharge detection voltage (VCU) + 50 mV even when a heavy load, which causes an overcurrent, is connected, the overcurrent 1 and overcurrent 2 do not work until the battery voltage drops bellow the overcharge detection voltage (VCU) + 50 mV. Since an actual battery has, however, an internal impedance of several dozens of m, and the battery voltage drops immediately after a heavy load which causes an overcurrent is connected, the overcurrent 1 and overcurrent 2 work. Detection of load short-circuiting works regardless of the battery voltage. 14 Seiko Instruments Inc. Rev.4.1_01 BATTERY PROTECTION IC FOR 1-CELL PACK S-8241 Series Overdischarge Condition (for products with power-down function) When the battery voltage drops below the overdischarge detection voltage (VDL) during discharging under normal condition and it continues for the overdischarge detection delay time (tDL) or longer, the S-8241 turns the discharging control FET off and stops discharging. This condition is called overdischarge condition. After the discharging control FET is turned off, the VM pin is pulled up by the RVMD resistor between VM and VDD in the IC. Meanwhile the potential difference between VM and VDD drops below 1.3 V (typ.) (the load short-circuiting detection voltage), current consumption of the IC is reduced to the power-down current consumption (IPDN). This condition is called power-down condition. The VM and VDD pins are shorted by the RVMD resistor in the IC under the overdischarge and power-down conditions. The power-down condition is released when a charger is connected and the potential difference between VM and VDD becomes 1.3 V (typ.) or higher (load short-circuiting detection voltage). At this time, the FET is still off. When the battery voltage becomes the overdischarge detection voltage (VDL) or higher (see note), the S-8241 turns the FET on and changes to the normal condition from the overdischarge condition. Remark If the VM pin voltage is no less than the charger detection voltage (VCHA), when the battery under overdischarge condition is connected to a charger, the overdischarge condition is released (the discharging control FET is turned on) as usual, provided that the battery voltage reaches the overdischarge release voltage (VDU) or higher. Overdischarge Condition (for products without power-down function) When the battery voltage drops below the overdischarge detection voltage (VDL) during discharging under normal condition and it continues for the overdischarge detection delay time (tDL) or longer, the S-8241 turns the discharging control FET off and stops discharging. When the discharging control FET is turned off, the VM pin is pulled up by the RVMD resistor between VM and VDD in the IC. Meanwhile the potential difference between VM and VDD drops below 1.3 V (typ.) (the load short-circuiting detection voltage), current consumption of the IC is reduced to the overdischarge current consumption (IOPED). This condition is called overdischarge condition. The VM and VDD pins are shorted by the RVMD resistor in the IC under the overdischarge condition. When a charger is connected, the overdischarge condition is released in the same way as explained above in respect to products having the power-down function. For products without the power-down function, in addition, even if the charger is not connected, the S-8241 turns the discharging control FET on and changes to the normal condition from the overdischarge condition provided that the load is disconnected and that the potential difference between VM and VSS drops below the overcurrent 1 detection voltage (VIOV1), since the VM pin is pulled down by the RVMS resistor between VM and VSS in the IC when the battery voltage reaches the overdischarge release voltage (VDU) or higher. Charger Detection If the VM pin voltage is lower than the charger detection voltage (VCHA) when a battery in overdischarge condition is connected to a charger, overdischarge hysteresis is released, and when the battery voltage becomes equal to or higher than the overdischarge detection voltage (VDL), the overdischarge condition is released (the discharging control FET is turned on). This action is called charger detection. (The charger detection reduces the time for charging in which charging current flows through the internal parasitic diode in the discharging control FET.) If the VM pin voltage is not lower than the charger detection voltage (VCHA) when a battery in overdischarge condition is connected to a charger, the overdischarge condition is released (the discharging control FET is turned on) as usual, when the battery voltage reaches the overdischarge release voltage (VDU) or higher. Seiko Instruments Inc. 15 BATTERY PROTECTION IC FOR 1-CELL PACK S-8241 Series Rev.4.1_01 Abnormal Charge Current Detection If the VM pin voltage drops below the charger detection voltage (VCHA) during charging under the normal condition and it continues for the overcharge detection delay time (tCU) or longer, the S-8241 turns the charging control FET off and stops charging. This action is called abnormal charge current detection. Abnormal charge current detection works when the discharging control FET is on (DO pin voltage is "H") and the VM pin voltage drops below the charger detection voltage (VCHA). When an abnormal charge current flows into a battery in the overdischarge condition, the S-8241 consequently turns the charging control FET off and stops charging after the battery voltage becomes the overdischarge detection voltage or higher (DO pin voltage becomes "H") and the overcharge detection delay time (tCU) elapses. Abnormal charge current detection is released when the voltage difference between VM pin and VSS pin becomes lower than the charger detection voltage (VCHA) by separating the charger. Since the 0 V battery charging function has higher priority than the abnormal charge current detection function, abnormal charge current may not be detected by the product with the 0 V battery charging function while the battery voltage is low. Delay Circuits The following detection delay times are generated by dividing the approximate 2 kHz clock with a counter. [Example] Overcharge detection delay time (= abnormal charge current detection delay time): 1.0s Overdischarge detection delay time: 125 ms Overcurrent 1 detection delay time: 8 ms Overcurrent 2 detection delay time: 2 ms Caution 1. After having detected an overcurrent (overcurrent 1, overcurrent 2, short-circuiting), the state is held for the overdischarge detection delay time or longer without releasing the load, the condition changes to the power-down condition when the battery voltage drops below the overdischarge detection voltage. If the battery voltage drops below the overdischarge detection voltage due to overcurrent, the discharging control FET is turned off when the overcurrent is detected. If the battery voltage recovers slowly and if the battery voltage after the overdischarge detection delay time is equal to or lower than the overdischarge detection voltage, the S-8241 changes to the power-down condition. VDD DO pin VSS VDD Overcurrent 2 detection delay time (tIOV2) Time VIOV2 VM pin VIOV1 VSS Time Figure 5 2. Counting for the overcurrent 2 detection delay time starts when the overcurrent 1 is detected. Having detected the overcurrent 1, if the overcurrent 2 is detected after the overcurrent 2 detection delay time, the S-8241 turns the discharging control FET off as shown in the figure 5. In this case, the overcurrent 2 detection delay time may seem to be longer or overcurrent 1 detection delay time may seem to be shorter than expected. 16 Seiko Instruments Inc. BATTERY PROTECTION IC FOR 1-CELL PACK S-8241 Series Rev.4.1_01 0V Battery Charging Function (1) (2) (3) This function enables the charging of a connected battery whose voltage is 0 V by self-discharge. When a charger having 0 V battery start charging charger voltage (V0CHA) or higher is connected between EB+ and EB- pins, the charging control FET gate is fixed to VDD potential. When the voltage between the gate and the source of the charging control FET becomes equal to or higher than the turn-on voltage by the charger voltage, the charging control FET is turned on to start charging. At this time, the discharging control FET is off and the charging current flows through the internal parasitic diode in the discharging control FET. If the battery voltage becomes equal to or higher than the overdischarge release voltage (VDU), the normal condition returns. 0V Battery Charge Inhibiting Function (1) (3) This function forbids the charging of a connected battery which is short-circuited internally (0V battery). When the battery voltage becomes 0.9 V (typ.) or lower, the charging control FET gate is fixed to EBpotential to forbid charging. Charging can be performed, when the battery voltage is the 0 V battery charge inhibiting voltage (V0INH) or higher. (1) Some battery providers do not recommend charging of completely discharged batteries. Please refer to battery providers before the selection of 0 V battery charging function. (2) The 0V battery charging function has higher priority than the abnormal charge current detection function. Consequently, a product with the 0 V battery charging function charges a battery and abnormal charge current cannot be detected during the battery voltage is low (at most 1.8 V or lower). (3) When a battery is connected to the IC for the first time, the IC may not enter the normal condition in which discharging is possible. In this case, set the VM pin voltage equal to the VSS voltage (short the VM and VSS pins or connect a charger) to enter the normal condition. Seiko Instruments Inc. 17 BATTERY PROTECTION IC FOR 1-CELL PACK S-8241 Series Rev.4.1_01 Timing Chart 1-1. Overcharge and overdischarge detection (for products with power-down function) V CU V CL B attery voltage V DU V DL V DD DO pin V SS V DD C O pin V SS V DD VM pin V IO V1 V SS V CHA Charger connected Load connected O vercharge detection delay tim e (t C U ) O verdischarge detection delay tim e (t D L ) M ode (1) (1) (2) (1) (3) Note: (1) N orm al m ode, (2) O vercharge m ode, (3) O verdischarge m ode, (4) O vercurrent m ode The charger is assum ed to charge with a constant current. Figure 6 1-2. Overcharge and overdischarge detection (for products without power-down function) B a tt e r y v o lta g e V CU V CL V DU V DL V DD D O p in V SS V DD C O p in V SS V DD V M p in V IO V 1 V SS V CHA C h a rg e r c o n n e c te d Load c o n n e c te d O v e r c h a r g e d e te c tio n d e la y tim e (t C U ) O v e r d is c h a rg e d e te c tio n d e la y tim e ( t D L ) O v e rd is c h a rg e d e te c tio n d e la y tim e ( t D L ) M ode (1 ) (2 ) (1 ) (3 ) (1 ) N o te : (1 ) N o rm a l m o d e , (2 ) O v e rc h a rg e m o d e , (3 ) O v e rd is c h a r g e m o d e , (4 ) O v e rc u rre n t m o d e T h e c h a rg e r is a s s u m e d to c h a rg e w ith a c o n s ta n t c u rre n t. Figure 7 18 Seiko Instruments Inc. (3 ) (1 ) BATTERY PROTECTION IC FOR 1-CELL PACK S-8241 Series Rev.4.1_01 2. Overcurrent detection VCU VCL Battery voltage VDU VDL VDD DO pin VSS CO pin VDD VSS VM pin VDD VSHORT VIOV2 VIOV1 VSS Charger connection Load connection Overcurrent 1 detection delay time (tIOV1) Overcurrent 2 detection delay time (tIOV2) Load short-circuiting detection delay time (t SHORT) Mode (1) (1) (4) (1) (4) (1) (4) Note: (1) Normal mode, (2) Overcharge mode, (3) Overdischarge mode, (4) Overcurrent mode The charger is assumed to charge with constant current. Figure 8 3. Charger detection Battery voltage DO pin VCU VCL VDU VDL VDD VSS CO pin VDD VSS VM pin VDD VSS VCHA Charger connection Load connection Overdischarge detection delay time (tDL) If VM pin voltage < VCHA Overdischarge is released at overdischarge detection voltage (VDL) Mode (1) (3) (1) Note: (1) Normal mode, (2) Overcharge mode, (3) Overdischarge mode, (4) Overcurrent mode The charger is assumed to charge with constant current. Figure 9 Seiko Instruments Inc. 19 BATTERY PROTECTION IC FOR 1-CELL PACK S-8241 Series Rev.4.1_01 4. Abnormal charge current detection Battery voltage DO pin VCU VCL VDU VDL VDD VSS CO pin VDD VSS VM pin VDD VSS VCHA Charger connection Load connection Abnormal charging current detection delay time ( = Overcharge detection delay time (tCU)) Overdischarge detection delay time (tDL) Mode (1) (3) (1) (2) Note: (1) Normal mode, (2) Overcharge mode, (3) Overdischarge mode, (4) Overcurrent mode The charger is assumed to charge with constant current. Figure 10 20 Seiko Instruments Inc. (1) BATTERY PROTECTION IC FOR 1-CELL PACK S-8241 Series Rev.4.1_01 Battery Protection IC Connection Example EB+ R1 VDD 470 Battery C1 S-8241Series 0.1 F VSS DO FET1 CO VM R2 1 k FET2 EB- Figure 11 Table 1 Constants for External Components Symbol Parts Purpose Typ. min. max. Remarks 0.4 V Threshold voltage overdischarge detection voltage. *1 Nch FET1 Discharge control Withstand voltage between gate and MOS_FET source Charger voltage *2 0.4 V Threshold voltage overdischarge detection voltage. *1 Nch FET2 Charge control Withstand voltage between gate and MOS_FET *2 source Charger voltage Protection for ESD and Relation R1 R2 should be R1 Resistor R2 value 470 300 power fluctuation maintained.*3 Protection for power Install a capacitor of 0.01 F or C1 Capacitor 0.1 F 0.01 F 1.0 F fluctuation higher between VDD and VSS. *4 To suppress current flow caused by reverse connection of a charger, set the Protection for charger R2 Resistor 1 k 300 1.3 k reverse connection resistance within the range from 300 to *5 1.3 k. *1. If an FET with a threshold voltage of 0.4 V or lower is used, the FET may fail to cut the charging current. If an FET with a threshold voltage equal to or higher than the overdischarge detection voltage is used, discharging may stop before overdischarge is detected. *2. If the withstand voltage between the gate and source is lower than the charger voltage, the FET may break. *3. If R1 has a higher resistance than R2 and if a charger is connected reversely, current flows from the charger to the IC and the voltage between VDD and VSS may exceed the absolute maximum rating. Install a resistor of 300 or higher as R1 for ESD protection. If R1 has a high resistance, the overcharge detection voltage increases by IC current consumption. *4. If a capacitor C1 is less than 0.0 1F, DO may oscillate when load short-circuiting is detected, a charger is connected reversely, or overcurrent 1 or 2 is detected. A capacitor of 0.01 F or higher as C1 should be installed. In some types of batteries DO oscillation may not stop unless the C1 capacity is increased. Set the C1 capacity by evaluating the actual application. *5. If R2 is set to less than 300 , a current which is bigger than the power dissipation flows through the IC and the IC may break when a charger is connected reversely. If a resistor bigger than 1.3 k is installed as R2, the charging current may not be cut when a high-voltage charger is connected. 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. Seiko Instruments Inc. 21 BATTERY PROTECTION IC FOR 1-CELL PACK S-8241 Series Rev.4.1_01 Precautions * Pay attention to the operating conditions for input/output voltage and load current so that the power loss in the IC does not exceed the power dissipation of the package. * 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 by products including this IC of patents owned by a third party. 22 Seiko Instruments Inc. BATTERY PROTECTION IC FOR 1-CELL PACK S-8241 Series Rev.4.1_01 Typical Characteristics 1. Detection/release voltage temperature characteristics Overcharge release voltage vs. temperature 4.33 4.23 4.31 4.21 4.29 4.19 VCL (V) VCU (V) Overcharge detection voltage vs. temperature 4.27 4.17 4.25 4.15 4.23 4.13 -50 -50 -25 0 25 50 75 100 -25 0 Ta(C) 50 75 100 75 100 75 100 Overdischarge release voltage vs. temperature 2.40 2.50 2.36 2.46 2.32 2.42 VDU (V) VDL (V) Overdischarge detection voltage vs. temperature 2.28 2.24 2.38 2.34 2.20 -50 2.30 -25 0 25 50 75 100 -50 -25 0 Ta(C) 50 Overcurrent 2 detection voltage vs. temperature 0.60 0.105 0.55 VIOV2 (V) 0.110 0.100 0.095 0.090 -50 25 Ta(C) Overcurrent 1 detection voltage vs. temperature VIOV1 (V) 25 Ta(C) 0.50 0.45 0.40 -25 0 25 50 75 100 -50 -25 0 Ta(C) 25 50 Ta(C) 2. Current consumption temperature characteristics Current consumption vs. Temperature in normal mode Current consumption vs. Temperature in power-down mode 6 0.10 0.08 4 IPDN (A) IOPE (A) 5 3 2 1 0.06 0.04 0.02 0 -50 -25 0 25 50 Ta(C) 75 100 0.00 -50 -25 0 25 50 75 100 Ta(C) Seiko Instruments Inc. 23 BATTERY PROTECTION IC FOR 1-CELL PACK S-8241 Series Rev.4.1_01 3. Current consumption Power voltage characteristics (Ta=25C) Current consumption - power supply volatge dependency VM=VSS IOPE (A) 20 15 10 5 0 0 2 4 6 8 10 VDD(V) 4. Detection/release delay time temperature characteristics Overcharge release delay time vs. temperature 2.0 1.0 1.5 0.8 tCL (ms) tcu (s) Overcharge detection delay time vs. temperature 1.0 0.6 0.4 0.5 0.2 0.0 -50 -25 0 25 50 75 0.0 100 -50 -25 0 25 250 tcu (s) tDL (ms) 200 150 100 50 -50 -25 0 25 50 75 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 100 -50 -25 0 25 16 75 100 500 tIOV1 (s) Release tIOV1 (ms) 50 Overcurrent 1 release delay time vs. temperature Overcurrent 1 detection delay time vs. temperature 12 8 4 -50 -25 0 25 Ta(C) 24 100 Ta(C) Ta(C) 0 75 Overdischarge release delay time vs. temperature Overdischarge detection delay time vs. temperature 0 50 Ta(C) Ta(C) 50 75 100 400 300 200 100 0 -50 -25 0 25 Ta(C) Seiko Instruments Inc. 50 75 100 BATTERY PROTECTION IC FOR 1-CELL PACK S-8241 Series Rev.4.1_01 Load short-circuiting delay time vs. temperature 4 50 3 40 tSHORT (s) tIOV2 (ms) Overcurrent 2 detection delay time vs. temperature 2 1 30 20 10 0 -50 -25 0 25 50 75 0 100 -50 -25 0 Ta(C) 25 50 75 100 Ta(C) 5. Delay time power-voltage characteristics(Ta=25C) Overcurrent 2 detection delay time vs. power supply voltage dependency 16 4 12 3 tIOV2 (ms) tIOV1 (ms) Overcurrent 1 detection delay time vs. power supply voltage dependency 8 2 4 1 0 0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 2.0 2.5 3.0 VDD(V) 3.5 4.0 4.5 5.0 VDD(V) 6. CO pin/DO pin output current characteristics(Ta=25C) CO pin source current characteristics -1.4 -1.2 10 -1.0 8 -0.8 -0.6 -0.4 6 4 -0.2 2 0.0 0 0 1 2 3 VDD=4.5V,VSS=VM=0V 12 ICO (A) ICO (mA) CO pin sink current characteristics VDD=3.5V,VSS=VM=0V 0 4 1 2 4 5 DO pin sink current characteristics VDD=3.5V,VSS=VM=0V VDD=1.8V,VSS=VM=0V 2.5 2.0 IDO (mA) IDO (mA) DO pin source current characteristics -1.8 -1.6 -1.4 -1.2 -1.0 -0.8 -0.6 -0.4 -0.2 0.0 3 VCO(V) VCO(V) 1.5 1.0 0.5 0.0 0 1 2 3 4 0.0 VDO(V) 0.5 1.0 1.5 2.0 VDO(V) Seiko Instruments Inc. 25 2.90.2 1.90.2 4 5 1 2 +0.1 0.16 -0.06 3 0.950.1 0.40.1 No. MP005-A-P-SD-1.2 TITLE No. SOT235-A-PKG Dimensions MP005-A-P-SD-1.2 SCALE UNIT mm Seiko Instruments Inc. 4.00.1(10 pitches:40.00.2) +0.1 o1.5 -0 2.00.05 +0.2 o1.0 -0 0.250.1 4.00.1 1.40.2 3.20.2 3 2 1 4 5 Feed direction No. MP005-A-C-SD-2.1 TITLE SOT235-A-Carrier Tape No. MP005-A-C-SD-2.1 SCALE UNIT mm Seiko Instruments Inc. 12.5max. 9.00.3 Enlarged drawing in the central part o130.2 (60) (60) No. MP005-A-R-SD-1.1 SOT235-A-Reel TITLE No. MP005-A-R-SD-1.1 SCALE QTY. UNIT mm Seiko Instruments Inc. 3,000 2.00.2 1.30.1 5 1 4 2 3 0.65 0.65 +0.1 0.2 -0.05 No. PN005-A-P-SD-1.1 TITLE No. SON5A-A-PKG Dimensions PN005-A-P-SD-1.1 SCALE UNIT mm Seiko Instruments Inc. o1.550.05 4.00.1 2.00.1 0.20.05 4.00.1 o1.050.1 1.10.1 (2.25) 2.050.1 3 2 1 4 5 Feed direction No. PN005-A-C-SD-1.1 TITLE SON5A-A-Carrier Tape No. PN005-A-C-SD-1.1 SCALE UNIT mm Seiko Instruments Inc. 12.5max. 9.00.3 Enlarged drawing in the central part No. PN005-A-R-SD-1.1 SON5A-A-Reel TITLE No. PN005-A-R-SD-1.1 QTY. SCALE UNIT 3000 mm Seiko Instruments Inc. * * * * * * 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. 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