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Rev.3.8_00
BATTERY PROTECTION IC FOR A SINGLE 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) *1 * Overcharge release voltage 3.8 V to 4.4 V 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 2.0 V to 3.4 V 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
* SOT-23-5 (PKG drawing code : MP005-A) * 5-Pin SON(A) (PKG drawing code : PN005-A)
Seiko Instruments Inc.
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BATTERY PROTECTION IC FOR A SINGLE CELL PACK S-8241 Series Block Diagram
Rev.3.8_00
Delay circuit
Clock generation circuit
VDD
DO
Load shortcircuiting detection circuit
Counter circuit
- + Overcharge detection comparator
Level conversion circuit 0V battery charging circuit 0V battery charge inhibition circuit
CO RCOL
Overdischarge detection comparator + -
The overdischarge hysterisis is released when a charger is detected. Charger detection circuit Overcurrent 1 detection comparator
RVMD + - RVMS VM
+ - Overcurrent 2 detection comparator
VSS
Remark The diodes in the IC are parasitic diodes Figure 1 Block Diagram
Product Code Structure
1. Product name Product name: S-8241AB S-8241AC Symbol -product code (GB)-taping orientation (T2 or TF) -product code (GC)-taping orientation (T2 or TF) Meaning Serial number Package form Description Is set from A to Z in sequence. MC:SOT-23-5, PN:5-pin SON(A)
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Seiko Instruments Inc.
Rev.3.8_00
2. Product name list
BATTERY PROTECTION IC FOR A SINGLE CELL PACK S-8241 Series
Model No./Item
Overcharge detection voltage [VCU] 4.275 V 4.280 V 4.350 V 4.275 V 4.295 V 4.325 V 4.200 V 4.325 V 4.280 V 4.325 V 4.320 V 4.350V 4.350V 4.350V 4.280V 4.350V 4.300V 4.200V 4.295V 4.280V 4.350V 4.220 V 4.275 V 4.280 V 4.300 V 4.275 V 4.295 V 4.295 V 4.295 V 4.280 V 4.350 V 4.300V 4.350V 4.200V 4.350V
Overcharge release voltage [VCL] 4.075 V 3.980 V 4.100 V 4.175 V 4.095 V 4.075 V 4.100 V 4.125 V 4.080 V 4.075 V 4.070 V 4.050V 4.15V 4.15V 4.080V 4.150V 4.100V 4.100V 4.095V 4.080V 4.000V 4.220 V 4.075 V 4.080 V 4.100 V 4.075 V 4.095 V 4.095 V 4.095 V 4.080 V 4.150 V 4.100V 4.150V 4.200V 4.150V
Overdischarge detection voltage [VDL] 2.3 V 2.3 V 2.3 V 2.3 V 2.3 V 2.5 V 2.3 V 2.3 V 2.3 V 2.5 V 2.5 V 2.35V 2.3V 2.3V 2.3V 2.35V 2.3V 2.3V 2.3V 2.3V 2.6V 2.3 V 2.3 V 2.3 V 2.3 V 2.3 V 2.3 V 2.3 V 2.3 V 2.6 V 2.05 V 2.3V 2.0V 2.5V 2.1V
Overdischarge release voltage [VDU] 2.9 V 2.4 V 2.8 V 2.4 V 3.0 V 2.9 V 3.0 V 2.3 V 2.3 V 2.9 V 2.9 V 2.65V 3.0V 3.0V 2.3V 2.65V 2.3V 2.3V 2.3V 2.3V 3.3V 2.3 V 2.4 V 2.3 V 2.3 V 2.3 V 2.3 V 2.3 V 2.3 V 2.6 V 2.75 V 2.3V 2.0V 3.0V 2.2V
Overcurrent 1 detection voltage [VIOV1] 0.100 V 0.125 V 0.075 V 0.100 V 0.200 V 0.100 V 0.100 V 0.100 V 0.160 V 0.150 V 0.100 V 0.150V 0.150V 0.200 V 0.130 V 0.200 V 0.100 V 0.150 V 0.130 V 0.130 V 0.200 V 0.200 V 0.140 V 0.200 V 0.150 V 0.100 V 0.080 V 0.090 V 0.060 V 0.200 V 0.200 V 0.120V 0.200V 0.100V 0.200V
0V battery charging function
Delay time combi*1 nation (1) (2) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (2) (2) (1) (2) (1) (1) (1) (3) (1) (3) (1) (1) (1) (4) (1) (1) (1) (1) (2) (1) (2) (1) (2)
Power down function
S-8241ABAMC-GBA-T2 S-8241ABBMC-GBB-T2 S-8241ABCMC-GBC-T2 S-8241ABDMC-GBD-T2 S-8241ABDPN-KBD-TF S-8241ABEMC-GBE-T2 S-8241ABFMC-GBF-T2 S-8241ABGMC-GBG-T2 S-8241ABHMC-GBH-T2 S-8241ABIMC-GBI-T2 S-8241ABKMC-GBK-T2 S-8241ABLMC-GBL-T2 S-8241ABNPN-KBN-TF S-8241ABOMC-GBO-T2 S-8241ABPMC-GBP-T2 S-8241ABQMC-GBQ-T2 S-8241ABSPN-KBS-TF S-8241ABTPN-KBT-TF S-8241ABUMC-GBU-T2 S-8241ABVMC-GBV-T2 S-8241ABWMC-GBW-T2 S-8241ABXMC-GBX-T2 S-8241ABXPN-KBX-TF S-8241ABYMC-GBY-T2 S-8241ABZPN-KBZ-TF S-8241ACAMC-GCA-T2 S-8241ACAPN-KCA-TF S-8241ACBMC-GCB-T2 S-8241ACDMC-GCD-T2 S-8241ACEMC-GCE-T2 S-8241ACFMC-GCF-T2 S-8241ACGMC-GCG-T2 S-8241ACGPN-KCG-TF S-8241ACHMC-GCH-T2 S-8241ACIMC-GCI-T2 S-8241ACJPN-KCJ-TF S-8241ACKMC-GCK-T2 S-8241ACLMC-GCL-T2 S-8241ACNMC-GCN-T2
Unavailable Available Unavailable Available Unavailable Unavailable Unavailable Available Unavailable Unavailable Unavailable Available Available Available Unavailable Available Available Unavailable Available Unavailable Unavailable Available Available Available Available Unavailable Available Available Available Available Available Available Available Available Available
Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available
Seiko Instruments Inc.
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BATTERY PROTECTION IC FOR A SINGLE CELL PACK S-8241 Series
Rev.3.8_00
Model No./Item
Overcharge detection voltage [VCU] 4.100 V 4.325 V 4.275 V 4.350 V 4.180 V 4.100 V 4.180 V 4.350 V
Overcharge release voltage [VCL] 3.850 V 4.075 V 4.175 V 4.150 V 3.930 V 4.000 V 4.080 V 4.150 V
Overdischarge detection voltage [VDL] 2.5 V 2.5 V 2.3 V 2.3 V 2.5 V 2.5 V 2.5 V 2.3 V
Overdischarge release voltage [VDU] 2.9 V 2.9 V 2.4 V 3.0 V 2.9 V 2.9 V 2.9 V 3.0 V
Overcurrent 1 detection voltage [VIOV1] 0.150 V 0.150 V 0.100 V 0.100 V 0.150 V 0.150 V 0.150 V 0.200 V
0V battery charging function
Delay time combi*1 nation (1) (1) (1) (1) (1) (1) (1) (2)
Power down function
S-8241ACOMC-GCO-T2 S-8241ACPMC-GCP-T2 S-8241ACQMC-GCQ-T2 S-8241ACRMC-GCR-T2 S-8241ACSMC-GCS-T2 S-8241ACTMC-GCT-T2 S-8241ACUMC-GCU-T2 S-8241ACWMC-GCW-T2
Unavailable Unavailable Available Available Unavailable Unavailable Unavailable Available
Unavailable Unavailable Unavailable Unavailable Unavailable Unavailable Unavailable Unavailable
*1. The delay time combination (1), (2), (3), (4) is as follows. Delay time combination (1) (2) (3) (4) Overcharge detection delay time 1.0 s 0.125 s 0.25 s 2.0 s Overdischarge detection delay time 125 ms 31 ms 125 ms 125 ms Overcurrent 1 detection delay time 8 ms 16 ms 8 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 Overcharge detection delay time Overdischarge detection delay time Overcurrent 1 detection delay time Symbol tCU tDL tlOV1 0.25 s 31 ms 4 ms Optional range 0.5 s 62.5 ms 8 ms 1.0 s 125 ms 16 ms Remarks Choose from the list at left. Choose from the list at left. Choose from the list at left.
Shaded boxes indicate standard values.
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Seiko Instruments Inc.
Rev.3.8_00 Pin Assignment
SOT-23-5 Top view 5 4
BATTERY PROTECTION IC FOR A SINGLE CELL PACK S-8241 Series
Pin No. 1 2 3 4 5
Symbol VM VDD VSS DO CO
Description Voltage detection pin between VM and VSS (Overcurrent detection pin) Positive power input pin Negative power input pin FET gate connection pin for discharge control (CMOS output) FET gate connection pin for charge control (CMOS output)
1
2 Figure 2
3
Pin No.
5-Pin SON(A) Top view 5 4
Symbol VM VDD CO DO
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)
1 2 3 4
1
2
3
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 *1 Input voltage between VDD and VSS VM Input pin voltage CO output pin voltage DO output pin voltage Power dissipation SOT-23-5 5-Pin SON(B) Operating temperature range Storage temperature range Symbol VDS VVM VCO VDO PD Topr Tstg Applicable pin VDD VM CO DO - - - Rating VSS -0.3 to VSS +12 VDD -26 to VDD +0.3 VVM -0.3 to VDD +0.3 VSS -0.3 to VDD +0.3 250 150 -40 to +85 -40 to +125 Unit V V V V mW C 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.
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BATTERY PROTECTION IC FOR A SINGLE CELL PACK S-8241 Series
Electrical Characteristics (1) Other than detection delay time (25C)
Item Symbol Measurement conditions Remarks Min.
Rev.3.8_00
(Ta = 25C unless otherwise specified) Measure Typ. Max. Unit -ment circuit
DETECTION VOLTAGE - VCU 1 VCU-0.025 VCU VCU+0.025 V 1 Overcharge detection voltage *1 VCU=3.9 to 4.4 V, 5 mV Step Ta= -5C to 55C VCU-0.030 VCU VCU+0.030 Overcharge release voltage VCL 1 When VCL VCU VCL-0.050 VCL VCL+0.050 V 1 VCU-VCL=0 to 0.4 V, 50mV Step When VCL = VCU VCL-0.025 VCL VCL+0.025 Overdischarge detection voltage - 1 VDL-0.080 VDL VDL+0.080 V 1 VDL VDL=2.0 to 3.0 V, 100mV Step Overdischarge release voltage VDU 1 When VDU VDL VDU-0.100 VDU VDU+0.100 VDU-VDL=0 to 0.7 V, 100mV Step When VDU = VDL VDU-0.080 VDU VDU+0.080 V 1 Overcurrent 1 detection voltage VIOV1+0.02 - 2 VIOV1-0.020 VIOV1 VIOV1 V 1 VIOV1=0.05 to 0.3V, 5mV Step 0 - Overcurrent 2 detection voltage VIOV2 2 0.4 0.5 0.6 V 1 Load short-circuiting detection 2 VM voltage based on VDD -1.7 -1.3 -0.9 V 1 VSHORT voltage - Charger detection voltage VCHA 3 -2.0 -1.3 -0.6 V 1 Overcharge detection voltage - - Ta= -5C to 55C -0.5 0 0.5 mV/C TCOE1 *1 temperature factor Overcurrent 1 detection voltage - - Ta= -5C to 55C -0.1 0 0.1 mV/C TCOE2 *1 temperature factor INPUT VOLTAGE, OPERATING VOLTAGE Input voltage between VDD and - - - absolute maximum rating -0.3 12 V VDS1 VSS - - - Input voltage between VDD and VM VDS2 absolute maximum rating -0.3 26 V Operating voltage between VDD - - - Internal circuit operating voltage 1.5 8 V VDSOP1 and VSS Operating voltage between VDD - - - Internal circuit operating voltage 1.5 24 V VDSOP2 and VM CURRENT CONSUMPTION Power-down function available Current consumption during normal A 4 VDD=3.5V, VVM=0 V 1.0 3.0 5.0 1 I OPE operation Current consumption at power - - A 4 VDD=VVM =1.5 V 0.1 1 I PDN down CURRENT CONSUMPTION Power-down function unavailable Current consumption during normal A 4 VDD=3.5 V, VVM=0 V 1.0 3.0 5.0 1 I OPE operation A Overdischarge current consumption I OPED 4 VDD=VVM =1.5 V 1.0 2.0 3.5 1 OUTPUT RESISTANCE CO pin H resistance RCOH 6 VCO=3.0 V,VDD=3.5 V,VVM=0 V 0.1 2 10 k 1 CO pin L resistance RCOL 6 VCO=0.5 V,VDD=4.5 V,VVM=0 V 150 600 2400 k 1 DO pin H resistance RDOH 7 VDO=3.0 V,VDD=3.5 V,VVM=0 V 0.1 1.3 6.0 k 1 DO pin L resistance RDOL 7 VDO=0.5 V,VDD=VVM=1.8 V 0.1 0.5 2.0 k 1 VM INTERNAL RESISTANCE Internal resistance between VM and 5 VDD=1.8 V, VVM =0 V 100 300 900 k 1 RVMD VDD Internal resistance between VM and 5 VDD=VVM =3.5 V 50 100 150 k 1 RVMS 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 charger 10 0 V battery charging Available 0.0 0.8 1.5 V 1 V0CHA voltage 0 V battery charge inhibiting battery 11 0 V battery charging Unavailable 0.6 0.9 1.2 V 1 V0INH voltage *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.
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Seiko Instruments Inc.
Rev.3.8_00
BATTERY PROTECTION IC FOR A SINGLE CELL PACK S-8241 Series
Electrical Characteristics (2) Other than detection delay time (-40 to 85C) *1
*1
Item
Symbol
Measurement conditions
Remarks
(Ta = (-40 to 85C )unless otherwise specified) Measure Min. Typ. Max. Unit -ment circuit
DETECTION VOLTAGE Overcharge detection voltage - 1 VCU-0.055 VCU VCU+0.040 V 1 VCU VCU=3.9 to 4.4 V, 5mV Step Overcharge release voltage VCL 1 When VCL VCU VCL-0.095 VCL VCL+0.060 V 1 VCU-VCL=0 to 0.4 V, 50mV Step When VCL = VCU VCL-0.055 VCL VCL+0.040 Overdischarge detection voltage - 1 VDL-0.120 VDL VDL+0.120 V 1 VDL VDL=2.0 to 3.0 V, 100mV Step Overdischarge release voltage VDU 1 When VDU VDL VDU-0.140 VDU VDU+0.140 V 1 VDU-VDL=0 to 0.7 V, 100mV Step When VDU = VDL VDU-0.120 VDU VDU+0.120 Overcurrent 1 detection voltage - 2 VIOV1-0.026 VIOV1 VIOV1+0.026 V 1 VIOV1 VIOV1=0.05 to 0.3V, 5mV Step - Overcurrent 2 detection voltage VIOV2 2 0.37 0.5 0.63 V 1 Load short-circuiting detection 2 VM voltage based on VDD -1.9 -1.3 -0.7 V 1 VSHORT voltage - Charger detection voltage VCHA 3 -2.2 -1.3 -0.4 V 1 Overcharge detection voltage - - Ta= -40C to 85C -0.7 0 0.7 mV/C TCOE1 *1 temperature factor Overcurrent 1 detection voltage - - Ta= -40C to 85C -0.2 0 0.2 mV/C TCOE2 *1 temperature factor INPUT VOLTAGE, OPERATING VOLTAGE Input voltage between VDD and - - - absolute maximum rating -0.3 12 V VDS1 VSS - - - Input voltage between VDD and VM VDS2 absolute maximum rating -0.3 26 V Operating voltage between VDD - - - Internal circuit operating voltage 1.5 8 V VDSOP1 and VSS Operating voltage between VDD - - - Internal circuit operating voltage 1.5 24 V VDSOP2 and VM CURRENT CONSUMPTION Power-down function available Current consumption during normal A 4 VDD=3.5 V, VVM=0 V 0.7 3.0 6.0 1 I OPE operation Current consumption at power - - A 4 VDD=VVM =1.5 V 0.1 1 I PDN down CURRENT CONSUMPTION Power-down function unavailable Current consumption during normal A 4 VDD=3.5 V, VVM=0 V 0.7 3.0 6.0 1 I OPE operation A Overdischarge current consumption I OPED 4 VDD=VVM =1.5 V 0.6 2.0 4.5 1 OUTPUT RESISTANCE CO pin H resistance RCOH 6 VCO=3.0 V,VDD=3.5 V,VVM=0 V 0.07 2 13 k 1 CO pin L resistance RCOL 6 VCO=0.5 V,VDD=4.5 V,VVM=0 V 100 600 3500 k 1 DO pin H resistance RDOH 7 VDO=3.0 V,VDD=3.5 V,VVM=0 V 0.07 1.3 7.3 k 1 DO pin L resistance RDOL 7 VDO=0.5 V,VDD=VVM=1.8 V 0.07 0.5 2.5 k 1 VM INTERNAL RESISTANCE Internal resistance between VM and 5 VDD=1.8 V, VVM =0 V 78 300 1310 k 1 RVMD VDD Internal resistance between VM and 5 VDD=VVM =3.5 V 39 100 220 k 1 RVMS 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 charger 10 0 V battery charging Available 0.0 0.8 1.7 V 1 V0CHA voltage 0 V battery charge inhibiting battery 11 0 V battery charging Unavailable 0.4 0.9 1.4 V 1 V0INH voltage *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.
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BATTERY PROTECTION IC FOR A SINGLE CELL PACK S-8241 Series
Electrical Characteristics (3) Detection delay time (25C)
Rev.3.8_00
(Ta = 25C unless otherwise specified) 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 Symbol tCU tDL tlOV1 tlOV2 tSHORT tCU tDL tlOV1 tlOV2 tSHORT tCU tDL tlOV1 tlOV2 tCU tDL tlOV1 tlOV2 tSHORT Measurement conditions 8 8 9 9 9 8 8 9 9 9 8 8 9 9 8 8 9 9 9 Remarks - - - - - - - - - - - - - - - - - - - Min. 0.7 87.5 5.6 1.4 - 87.5 21 11 1.4 - 0.175 87.5 5.6 1.4 1.4 87.5 5.6 1.4 - Typ. 1.0 125 8 2 10 125 31 16 2 10 0.25 125 8 2 2.0 125 8 2 10 Max. 1.3 162.5 10.4 2.6 50 162.5 41 21 2.6 50 0.325 162.5 10.4 2.6 2.6 162.5 10.4 2.6 50 Unit s ms ms ms s ms ms ms ms s s ms ms ms s ms ms ms s Measurement circuit 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
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Seiko Instruments Inc.
Rev.3.8_00
BATTERY PROTECTION IC FOR A SINGLE CELL PACK S-8241 Series
*1
Electrical Characteristics (4) Detection delay time (-40 to 85C) *1
Item Symbol Measurement conditions 8 8 9 9 9 8 8 9 9 9 8 8 9 9 9 8 8 9 9 9 Remarks - - - - - - - - - - - - - - - - - - - - Min. 0.55 69 4.4 1.1 - 69 17 9 1.1 - 0.138 69 4.4 1.1 - 1.1 69 4.4 1.1 -
(Ta = -40 to 85C Typ. 1.0 125 8 2 10 125 31 16 2 10 0.25 125 8 2 10 2.0 125 8 2 10
unless otherwise specified) Unit s ms ms ms s ms ms ms ms s s ms ms ms s s ms ms ms s Measurement circuit 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
Max. 1.7 212 14 3.4 73 212 53 27 3.4 73 0.425 212 14 3.4 73 3.4 212 14 3.4 73
DELAY TIME (1) Overcharge detection delay time tCU Overdischarge detection delay time tDL Overcurrent 1 detection delay time tIOV1 Overcurrent 2 detection delay time tIOV2 Load short-circuiting detection delay tSHORT time DELAY TIME (2) Overcharge detection delay time tCU Overdischarge detection delay time tDL Overcurrent 1 detection delay time tIOV1 Overcurrent 2 detection delay time tIOV2 Load short-circuiting detection delay time tSHORT DELAY TIME (3) Overcharge detection delay time tCU Overdischarge detection delay time tDL Overcurrent 1 detection delay time tIOV1 Overcurrent 2 detection delay time tIOV2 Load short-circuiting detection delay time tSHORT DELAY TIME (4) Overcharge detection delay time tCU Overdischarge detection delay time tDL Overcurrent 1 detection delay time tIOV1 Overcurrent 2 detection delay time tIOV2 Load short-circuiting detection delay time tSHORT
*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.
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BATTERY PROTECTION IC FOR A SINGLE CELL PACK S-8241 Series
Measurement Circuits
Rev.3.8_00
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).
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Seiko Instruments Inc.
Rev.3.8_00
(4)
BATTERY PROTECTION IC FOR A SINGLE CELL PACK S-8241 Series
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 A SINGLE CELL PACK S-8241 Series
(9) Measurement Condition 9, Measurement Circuit 1
Rev.3.8_00
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
A
V1
VDD
S-8241 series
VSS VM DO CO
A IVM
V2
IDO V4 COM
A
V VDO
VCO V
A ICO
V3
Measurement circuit 1 Figure 4 12 Seiko Instruments Inc.
Rev.3.8_00 Description of Operation
Normal condition
BATTERY PROTECTION IC FOR A SINGLE CELL PACK S-8241 Series
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 A SINGLE CELL PACK S-8241 Series
Overcharge condition
Rev.3.8_00
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 ( and without overcharge hysteresis: Products with overcharge hysteresis (overcharge detection voltage (VCU) > overcharge release voltage (VCL)) 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. 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.
and
) depending on the products with
Products without overcharge hysteresis (Overcharge detection voltage (VCU) = Overcharge release voltage (VCL)) 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. 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.3.8_00
BATTERY PROTECTION IC FOR A SINGLE 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. 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.
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
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 A SINGLE CELL PACK S-8241 Series
Rev.3.8_00
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. [Ex.] 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
Remark * 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. * 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.
VDD DO pin VSS Overcurrent 2 detection delay time (tIOV2) Time
VDD VIOV2 VM pin VIOV1 VSS
Time
Figure 5
16
Seiko Instruments Inc.
Rev.3.8_00
0V battery charging function
BATTERY PROTECTION IC FOR A SINGLE CELL PACK S-8241 Series
(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 A SINGLE CELL PACK S-8241 Series
Operation Timing Chart
1-1. Overcharge and overdischarge detection (for products with power-down function)
VCU VCL VDU VDL VDD DO pin V SS VDD CO pin V SS VDD VM pin V IOV 1 V SS V C HA
Rev.3.8_00
Battery voltage
C harger connected Load connected O v ercharge detection delay tim e (t CU ) O v erdischarg e detection delay tim e (t DL )
Mode
Note:
N ormal mode, O vercharge mode, O verdischarge mode, The charger is assumed to charge with a constant current.
O vercurrent mode
Figure 6-1 1-2. Overcharge and overdischarge detection (for products without power-down function)
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 rc h a rg e d e te c tio n d e la y tim e (t C U ) 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 ) 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 )
B a tte r y v o lt a g e
Mode
N o te :
N o rm a l m o d e , O v e rc h a rg e m o d e , O v e rd is c h a rg e 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.
O v e rc u rre n t m o d e
Figure 6-2 18 Seiko Instruments Inc.
Rev.3.8_00
2. Overcurrent detection
VCU VCL
BATTERY PROTECTION IC FOR A SINGLE CELL PACK S-8241 Series
Battery voltage
VDU VDL
VDD
DO pin
VSS
CO pin
VDD VSS VDD VSHORT VIOV2 VIOV1 VSS
VM pin
Charger connection Load connection
Overcurrent 1 detection delay time (tIOV1)
Overcurrent 2 detection delay time (tIOV2)
Load short-circuiting detection delay time (tSHORT)
Mode
(1)
(4)
(1)
(4)
(1)
(4)
(1)
Note: (1) Normal mode, (2) Overcharge mode, (3) Overdischarge mode, (4) Overcurrent mode The charger is assumed to charge with constant current.
Figure 7 3. Charger detection
Battery voltage
VCU VCL VDU VDL VDD VSS
DO pin
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 8 Seiko Instruments Inc. 19
BATTERY PROTECTION IC FOR A SINGLE CELL PACK S-8241 Series
4. Abnormal charge current detection
VCU VCL VDU VDL VDD VSS
Rev.3.8_00
Battery voltage
DO pin
CO pin
VDD VSS VDD VSS VCHA
VM pin
Charger connection Load connection
Abnormal charging current detection delay time Overdischarge detection delay time (tDL) ( = Overcharge detection delay time (tCU))
Mode
(1)
(3)
(1)
(2)
(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
20
Seiko Instruments Inc.
Rev.3.8_00
BATTERY PROTECTION IC FOR A SINGLE CELL PACK S-8241 Series
Battery Protection IC Connection Example
EB+
R1 VDD 470
Battery
C1 0.1 F S-8241 Series
VSS
DO
CO
VM
FET1
FET2
R2 1 k EB-
Figure 10 Table 1 Constant
Symbol Parts Nch MOS_FET Purpose Recomm ended min. max. Remarks 0.4 V Threshold voltage overdischarge *1 detection voltage. Withstand voltage between gate and *2 source Charger voltage 0.4 V Threshold voltage overdischarge *1 detection voltage. Withstand voltage between gate and *2 source Charger voltage Relation R1 R2 should be maintained.
*3
FET1
Charge control
FET2
Nch MOS_FET Resistor Capacitor Resistor
Discharge control Protection for ESD and power fluctuation Protection for power fluctuation Protection for charger reverse connection
470 0.1 F 1 k
300 0.01 F 300
R2 value 1.0 F 1.3 k
R1 C1 R2
*1.
Install a capacitor of 0.01 F or *4 higher between VDD and VSS. To suppress current flow caused by reverse connection of a charger, set the resistance *5 within the range from 300 to 1.3 k.
*2. *3.
*4.
*5.
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. If the withstand voltage between the gate and source is lower than the charger voltage, the FET may break. 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. 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. 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 The above connection diagram and constant will not guarantee successful operation. Perform thorough evaluation using the actual application to set the constant.
Seiko Instruments Inc.
21
BATTERY PROTECTION IC FOR A SINGLE CELL PACK S-8241 Series
Precautions
Rev.3.8_00
* 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. * Seiko Instruments Inc. shall not be responsible for any patent infringement by products including the S-8241 series in connection with the method of using the S-8241 series in such products, the product specifications or the country of destination thereof.
22
Seiko Instruments Inc.
Rev.3.8_00
BATTERY PROTECTION IC FOR A SINGLE CELL PACK S-8241 Series
Characteristic (typical characteristic)
1. Detection/release voltage temperature characteristics
Overcharge detection voltage vs. temperature Overcharge release voltage vs. temperature
4.33 4.31
4.23 4.21
VCU (V)
VCL (V)
4.29 4.27 4.25 4.23 -50 -25 0 25 50 75 100
4.19 4.17 4.15 4.13 -50
-25
0
25
50
75
100
Ta(C)
Overdischarge detection voltage vs. temperature
Ta(C)
Overdischarge release voltage vs. temperature
2.40 2.36
2.50 2.46
2.28 2.24 2.20 -50
VDU (V)
-25 0 25 50 75 100
VDL (V)
2.32
2.42 2.38 2.34 2.30 -50 -25 0 25 50 75 100
Ta(C)
Overcurrent 1 detection voltage vs. temperature
Ta(C)
Overcurrent 2 detection voltage vs. temperature
0.110 0.105
0.60 0.55
VIOV1 (V)
0.100 0.095 0.090 -50
VIOV2 (V)
0.50 0.45 0.40
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
Ta(C) 2. Current consumption temperature characteristics
Current consumption vs. Temperature in normal mode
Ta(C)
Current consumption vs. Temperature in power-down mode
6 5
0.10 0.08
IOPE (A)
IPDN (A) -50 -25 0 25 50 Ta(C) 75 100
4 3 2 1 0
0.06 0.04 0.02 0.00 -50 -25 0 25 50 75 100
Ta(C)
Seiko Instruments Inc.
23
BATTERY PROTECTION IC FOR A SINGLE CELL PACK S-8241 Series
3. Current comsumption Power voltage characteristics (Ta=25C)
Current consumption - power supply volatge dependency VM=VSS 20 15
Rev.3.8_00
IOPE (A) 10
5 0 0 2 4 6 8 10
VDD(V) 4. Detection/release delay time temperature characteristics
Overcharge detection delay time vs. temperature Overcharge release delay time vs. temperature
2.0 1.5 1.0 0.5 0.0 -50 -25 0 25 50 75 100
1.0 0.8
tCL (ms)
tcu (s)
0.6 0.4 0.2 0.0 -50 -25 0 25 50 75 100
Ta(C)
Overdischarge detection delay time vs. temperature
Ta(C)
Overdischarge release delay time vs. temperature
250 200
100 50 0 -50 -25 0 25 50 75 100
tcu (s)
150
2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0
tDL (ms)
-50
-25
0
25
50
75
100
Ta(C)
Overcurrent 1 detection delay time vs. temperature
Ta(C)
Overcurrent 1 release delay time vs. temperature
16 12 8 4 0
500
tIOV1 (s) Release
400 300 200 100 0 -50 -25 0 25 50 75 100
tIOV1 (ms)
-50
-25
0
25
50
75
Ta(C)
100
Ta(C)
24
Seiko Instruments Inc.
Rev.3.8_00
4 3 2 1 0 -50 -25 0 25 50
BATTERY PROTECTION IC FOR A SINGLE CELL PACK S-8241 Series
Load short-circuiting delay time vs. temperature
Overcurrent 2 detection delay time vs. temperature
50 40
tIOV2 (ms)2
tSHORT (s)
30 20 10
75
100
0
-50
-25
0
25
50
75
100
Ta(C) 5. Delay time power-voltage characteristics(Ta=25C)
16 12
Overcurrent 1 detection delay time vs. power supply voltage dependency
Ta(C)
Overcurrent 2 detection delay time vs. power supply voltage dependency
4 3
tIOV1 (ms) 8
4 0 2.0 2.5 3.0 3.5 4.0 4.5 5.0
tIOV2 (ms) 2
1 0 2.0 2.5 3.0 3.5 4.0 4.5 5.0
VDD(V)
6. CO pin/DO pin output current characteristics(Ta=25C)
VDD(V)
CO pin source current characteristics
-1.4 -1.2 -1.0 VDD=3.5V,VSS=VM=0V
CO pin sink current characteristics
12 10 VDD=4.5V,VSS=VM=0V
ICO -0.8 (mA)-0.6
-0.4 -0.2 0.0 0 1 2 3 4
ICO (A) 6
4 2 0 0 1 2 3 4 5
8
VCO(V) DO pin source current characteristics
-1.8 -1.6 -1.4 -1.2 IDO -1.0 (mA)-0.8 -0.6 -0.4 -0.2 0.0 0 1 VDD=3.5V,VSS=VM=0V 2.5 2.0
VCO(V) DO pin sink current characteristics
VDD=1.8V,VSS=VM=0V
IDO 1.5 (mA)
1.0 0.5 0.0 2 3 4 0.0 0.5 1.0 1.5 2.0
VDO(V)
Seiko Instruments Inc.
VDO(V)
25
2.90.2 1.90.2
5 4
1
2
3
0.16 -0.06
+0.1
0.950.1 0.40.1
No. MP005-A-P-SD-1.2
TITLE No. SCALE UNIT
SOT235-A-PKG Dimensions MP005-A-P-SD-1.2
mm
Seiko Instruments Inc.
4.00.1(10 pitches:40.00.2)
+0.1
o1.5 -0
2.00.05
0.250.1
o1.0 -0
+0.2
4.00.1 1.40.2
3.20.2
321
4
5
Feed direction
No. MP005-A-C-SD-2.1
TITLE No. SCALE UNIT
SOT235-A-Carrier Tape MP005-A-C-SD-2.1
mm
Seiko Instruments Inc.
12.5max.
Enlarged drawing in the central part o130.2
9.00.3
(60)
(60)
No. MP005-A-R-SD-1.1
TITLE No. SCALE UNIT mm
SOT235-A-Reel MP005-A-R-SD-1.1
QTY. 3,000
Seiko Instruments Inc.
2.00.2 1.30.1
5 4
1
2
3
0.65 0.65
0.2 -0.05
+0.1
No. PN005-A-P-SD-1.1
TITLE No. SCALE UNIT
SON5A-A-PKG Dimensions PN005-A-P-SD-1.1
mm
Seiko Instruments Inc.
o1.550.05
2.00.1
4.00.1
0.20.05
4.00.1 o1.050.1 1.10.1
(2.25)
2.050.1
321
4
5
Feed direction
No. PN005-A-C-SD-1.1
TITLE No. SCALE UNIT
SON5A-A-Carrier Tape PN005-A-C-SD-1.1
mm
Seiko Instruments Inc.
12.5max.
Enlarged drawing in the central part
9.00.3
No. PN005-A-R-SD-1.1
TITLE No. SCALE UNIT mm
SON5A-A-Reel PN005-A-R-SD-1.1
QTY. 3000
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. 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. The products described herein cannot be used as part of any device or equipment affecting the human body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, without prior written permission of Seiko Instruments Inc. Although Seiko Instruments Inc. exerts the greatest possible effort to ensure high quality and reliability, the failure or malfunction of semiconductor products may occur. The user of these products should therefore give thorough consideration to safety design, including redundancy, fire-prevention measures, and malfunction prevention, to prevent any accidents, fires, or community damage that may ensue.

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