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s-8241 series www.sii-ic.com battery protection ic for 1-cell pack ? seiko instruments inc., 1999-2010 rev.9.0 _00 seiko instruments inc. 1 the s-8241 series is a series of lithium ion/lithium polymer rechargeable battery pr otection ics incorporating high-accuracy voltage detection circuits and delay circuits. these ics are suitable for protection of 1-cell lithium ion/lithium polymer battery packs from overchar ge, 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 (+25 c) and 30 mv ( ? 5 to +55 c) ? overcharge release voltage: 3.8 v to 4.4 v *1 accuracy of 50 mv ? overdischarge detection voltage: 2.0 v to 3. 0 v (100 mv-step) accuracy of 80 mv ? overdischarge release voltage: 2.0 v to 3.4 v *2 accuracy of 100 mv ? overcurrent 1 detection voltage: 0.05 v to 0.32 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: t cu ; overdischarge: t dl ; overcurrent 1: t lov1 ; overcurrent 2: t lov2 ) are generated by an internal circuit. (external capacit ors are unnecessary.) accuracy of 30% (4) internal three-step overcurrent detection circuit (o vercurrent 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 pow er-down function can be selected. (7) charger detection function and abno rmal charge current detection function ? the overdischarge hysteresis 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 char ge 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 c to +85 c (10) lead-free, sn 100%, halogen-free *3 *1. overcharge release voltage = overcharge detection voltage - overcharge hysteresis the overcharge hysteresis can be select ed in the range 0.0, or 0. 1 v to 0.4 v in 50 mv steps. (however, selection ?overcharge release volt age<3.8 v? is enabled.) *2. overdischarge release voltage = overdischarge detection voltage + overdischarge hysteresis the overdischarge hysteresis can be se lected in the range 0.0 v to 0.7 v in 100 mv steps. (however, selection ?overdischarge release voltage > 3.4 v? is enabled.) *3. refer to ? ? product name structure ? for details. ? applications ? lithium-ion rechargeable battery packs ? lithium- polymer rechargeable battery packs ? packages ? sot-23-5 ? snt-6a
battery protection ic for 1-cell pack s-8241 series rev.9.0 _00 seiko instruments inc. 2 ? block diagram + ? ? + vm vss v dd co do overcharge detection comparator overcurrent 1 detection comparator ? + ? + overdischarge detection comparator overcurrent 2 detection comparator delay circuit r vmd r vms counter circuit clock generation circuit the overdischarge hysterisis is released when a charger is detected. r col load short- circuiting detection circuit level conversion circuit 0v battery charging circuit 0v battery charge inhibition circuit charger detection circuit remark the diodes in the ic are parasitic diodes. figure 1
battery protection ic for 1-cell pack rev.9.0 _00 s-8241 series seiko instruments inc. 3 ? product name structure 1. product name s-8241a xx xx - xxx xx x environmental code u : lead-free (sn 100%), halogen-free g : lead-free (for details, please contact our sales office) ic direction in tape specifications *1 t2 : sot-23-5 tf : snt-6a product name (abbreviation) 2 package name (abbreviation) mc : sot-23-5 pg : snt-6a serial code sequentially set from ba to zz *1. refer to the tape specifications. *2. refer to the ? 3. product name list ?. 2. package drawing code package name package tape reel land sot-23-5 mp005-a-p-sd mp005-a-c-sd mp005-a-r-sd ? snt-6a pg006-a-p-sd pg006-a-c- sd pg006-a-r-sd pg006-a-l-sd
battery protection ic for 1-cell pack s-8241 series rev.9.0 _00 seiko instruments inc. 4 3. product name list (1) sot-23-5 table 1 (1 / 2) product name / item over- charge detection voltage [v cu ] over- charge release voltage [v cl ] over- discharge detection voltage [v dl ] over- discharge release voltage [v du ] over- current 1 detection voltage [v iov1 ] 0 v battery charging function delay time combi- nation *1 power down function s-8241abamc-gbat2x 4.275 v 4.075 v 2.30 v 2.90 v 0.100 v unavailable (1) yes s-8241abbmc-gbbt2x 4.280 v 3.980 v 2.30 v 2.40 v 0.125 v available (2) yes s-8241abcmc-gbct2x 4.350 v 4.100 v 2.30 v 2.80 v 0.075 v unavailable (1) yes s-8241abdmc-gbdt2x 4.275 v 4.175 v 2.30 v 2.40 v 0.100 v available (1) yes s-8241abemc-gbet2x 4.295 v 4.095 v 2.30 v 3.00 v 0.200 v unavailable (1) yes s-8241abfmc-gbft2x 4.325 v 4.075 v 2.50 v 2.90 v 0.100 v unavailable (1) yes s-8241abgmc-gbgt2x 4.200 v 4.100 v 2.30 v 3.00 v 0.100 v unavailable (1) yes s-8241abhmc-gbht2x 4.325 v 4.125 v 2.30 v 2.30 v 0.100 v available (1) yes s-8241abimc-gbit2x 4.280 v 4.080 v 2.30 v 2.30 v 0.160 v unavailable (1) yes s-8241abkmc-gbkt2x 4.325 v 4.075 v 2.50 v 2.90 v 0.150 v unavailable (1) yes s-8241ablmc-gblt2x 4.320 v 4.070 v 2.50 v 2.90 v 0.100 v unavailable (1) yes s-8241abomc-gbot2x 4.350 v 4.150 v 2.30 v 3.00 v 0.150 v available (2) yes s-8241abpmc-gbpt2x 4.350 v 4.150 v 2.30 v 3.00 v 0.200 v available (2) yes s-8241abqmc-gbqt2x 4.280 v 4.080 v 2.30 v 2.30 v 0.130 v unavailable (1) yes s-8241abrmc-gbrt2x 4.325 v 4.075 v 2.50 v 2.90 v 0.100 v unavailable (4) yes s-8241abtmc-gbtt2x 4.300 v 4.100 v 2.30 v 2.30 v 0.100 v available (1) yes s-8241abumc-gbut2x 4.200 v 4.100 v 2.30 v 2.30 v 0.150 v unavailable (1) yes s-8241abvmc-gbvt2x 4.295 v 4.095 v 2.30 v 2.30 v 0.130 v available (1) yes s-8241abwmc-gbwt2x 4.280 v 4.080 v 2.30 v 2.30 v 0.130 v unavailable (3) yes s-8241abxmc-gbxt2x 4.350 v 4.000 v 2.60 v 3.30 v 0.200 v unavailable (1) yes s-8241abymc-gbyt2x 4.220 v 4.220 v 2.30 v 2.30 v 0.200 v available (3) yes s-8241acamc-gcat2x 4.280 v 4.080 v 2.30 v 2.30 v 0.200 v available (1) yes s-8241acbmc-gcbt2x 4.300 v 4.100 v 2.30 v 2.30 v 0.150 v available (1) yes s-8241acdmc-gcdt2x 4.275 v 4.075 v 2.30 v 2.30 v 0.100 v unavailable (4) yes s-8241acemc-gcet2x 4.295 v 4.095 v 2.30 v 2.30 v 0.080 v available (1) yes s-8241acfmc-gcft2x 4.295 v 4.095 v 2.30 v 2.30 v 0.090 v available (1) yes s-8241acgmc-gcgt2x 4.295 v 4.095 v 2.30 v 2.30 v 0.060 v available (1) yes s-8241achmc-gcht2x 4.280 v 4.080 v 2.60 v 2.60 v 0.200 v available (1) yes s-8241acimc-gcit2x 4.350 v 4.150 v 2.05 v 2.75 v 0.200 v available (2) yes s-8241ackmc-gckt2x 4.350 v 4.150 v 2.00 v 2.00 v 0.200 v available (2) yes s-8241aclmc-gclt2x 4.200 v 4.200 v 2.50 v 3.00 v 0.100 v available (1) yes s-8241acnmc-gcnt2x 4.350 v 4.150 v 2.10 v 2.20 v 0.200 v available (2) yes s-8241acomc-gcot2x 4.100 v 3.850 v 2.50 v 2.90 v 0.150 v unavailable (1) no s-8241acpmc-gcpt2x 4.325 v 4.075 v 2.50 v 2.90 v 0.150 v unavailable (1) no s-8241acqmc-gcqt2x 4.275 v 4.175 v 2.30 v 2.40 v 0.100 v available (1) no s-8241acrmc-gcrt2x 4.350 v 4.150 v 2.30 v 3.00 v 0.100 v available (1) no s-8241acsmc-gcst2x 4.180 v 3.930 v 2.50 v 2.90 v 0.150 v unavailable (1) no
battery protection ic for 1-cell pack rev.9.0 _00 s-8241 series seiko instruments inc. 5 table 1 (2 /2) product name / item over- charge detection voltage [v cu ] over- charge release voltage [v cl ] over- discharge detection voltage [v dl ] over- discharge release voltage [v du ] over- current 1 detection voltage [v iov1 ] 0 v battery charging function delay time combi- nation *1 power down function s-8241actmc-gctt2x 4.100 v 4.000 v 2.50 v 2.90 v 0.150 v unavailable (1) no s-8241acumc-gcut2x 4.180 v 4.080 v 2.50 v 2.90 v 0.150 v unavailable (1) no s-8241acxmc-gcxt2x 4.275 v 4.075 v 2.50 v 2.90 v 0.150 v unavailable (1) no s-8241acymc-gcyt2x 4.275 v 4.075 v 2.60 v 2.90 v 0.100 v unavailable (1) no s-8241adamc-gdat2x 4.350 v 4.150 v 2.30 v 3.00 v 0.100 v available (1) yes s-8241addmc-gddt2x 4.185 v 4.085 v 2.80 v 2.90 v 0.150 v unavailable (1) yes s-8241ademc-gdet2x 4.350 v 4.150 v 2.10 v 2.20 v 0.150 v available (2) yes s-8241adfmc-gdft2x 4.350 v 4.150 v 2.10 v 2.10 v 0.150 v unavailable (5) yes s-8241adgmc-gdgt2x 4.275 v 4.075 v 2.10 v 2.10 v 0.150 v unavailable (5) yes s-8241adlmc-gdlt2x 4.220 v 4.070 v 2.70 v 3.00 v 0.300 v available (1) yes s-8241admmc-gdmt2x 4.230 v 4.080 v 2.70 v 3.00 v 0.300 v available (1) yes s-8241adnmc-gdnt2x 4.250 v 4.100 v 2.70 v 3.00 v 0.300 v available (1) yes s-8241adomc-gdot2x 4.275 v 4.175 v 2.30 v 2.40 v 0.100 v unavailable (1) no s-8241adqmc-gdqt2x 4.250 v 4.100 v 2.00 v 2.70 v 0.150 v available (1) yes s-8241adsmc-gdst2x 4.250 v 4.150 v 2.00 v 2.70 v 0.150 v available (1) yes s-8241adtmc-gdtt2x 4.180 v 4.180 v 2.50 v 3.00 v 0.100 v available (1) yes s-8241advmc-gdvt2x 3.900 v 3.900 v 2.00 v 2.30 v 0.150 v available (1) yes s-8241adwmc-gdwt2x 4.100 v 4.000 v 2.50 v 2.70 v 0.300 v unavailable (1) yes s-8241adymc-gdyt2x 4.100 v 4.000 v 2.00 v 2.20 v 0.300 v unavailable (1) yes s-8241aecmc-gect2x 4.100 v 4.000 v 2.00 v 2.70 v 0.300 v unavailable (1) yes s-8241aeemc-geet2x 4.200 v 4.200 v 2.50 v 3.00 v 0.320 v available (6) yes *1. refer to the table 3 about the details of the delay ti me combinations (1) to (6). remark 1. please contact our sales office for the products with detection voltage value other than those spec ified above. 2. x: g or u 3. please select products of environmental code = u for sn 100%, halogen-free products.
battery protection ic for 1-cell pack s-8241 series rev.9.0 _00 seiko instruments inc. 6 (2) snt-6a table 2 product name / item over- charge detection voltage [v cu ] over- charge release voltage [v cl ] over- discharge detection voltage [v dl ] over- discharge release voltage [v du ] over- current 1 detection voltage [v iov1 ] 0 v battery charging function delay time combi- nation *1 power down function s-8241abdpg-kbdtfx 4.275 v 4.175 v 2.30 v 2.40 v 0.100 v available (1) yes s-8241abkpg-kbktfx 4.325 v 4.075 v 2.50 v 2.90 v 0.150 v unavailable (1) yes s-8241abspg-kbstfx 4.350 v 4.150 v 2.35 v 2.65 v 0.200 v available (2) yes s-8241abzpg-kbztfx 4.275 v 4.075 v 2.30 v 2.40 v 0.140 v available (1) yes s-8241acfpg-kcftfx 4.295 v 4.095 v 2.30 v 2.30 v 0.090 v available (1) yes s-8241aczpg-kcztfx 4.350 v 4.150 v 2.70 v 2.70 v 0.200 v unavailable (2) yes s-8241adfpg-kdftfx 4.350 v 4.150 v 2.10 v 2.10 v 0.150 v unavailable (5) yes s-8241adhpg-kdhtfx 4.250 v 4.050 v 2.40 v 2.90 v 0.100 v available (1) no *1. refer to the table 3 about the details of the delay ti me combinations (1) to (6). remark 1. please contact our sales office for the products with detection voltage value other than those spec ified above. 2. x: g or u 3. please select products of environmental code = u for sn 100%, halogen-free products.
battery protection ic for 1-cell pack rev.9.0 _00 s-8241 series seiko instruments inc. 7 table 3 delay time combination overcharge detection delay time [t cu ] overdischarge detection delay time [t dl ] overcurrent 1 detection delay time [t lov1 ] (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 (5) 0.25 s 31 ms 16 ms (6) 1.0 s 125 ms 16 ms remark the delay times can be changed within the range listed table 4 . for details, please contact our sales office. table 4 delay time symbol selection range remarks overcharge detection delay time t cu 0.25 s 0.5 s 1.0 s 2.0 s se lect a value from the left. overdischarge detection delay time t dl 31 ms 62.5 ms 125 ms ? select a value from the left. overcurrent 1 detection delay time t lov1 4 ms 8 ms 16 ms ? select a value from the left. remark the value surrounded by bold lines is the delay time of the standard products.
battery protection ic for 1-cell pack s-8241 series rev.9.0 _00 seiko instruments inc. 8 ? pin configurations table 5 pin no. symbol description 1 vm voltage detection pin between vm and vss (overcurrent detection pin) 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 fet gate connection pin for charge control (cmos output) 5 4 1 3 2 sot-23-5 top view figure 2 table 6 pin no. symbol description 1 nc *1 no connection 2 co fet gate connection pin for charge control (cmos output) 3 do fet gate connection pin for discharge control (cmos output) snt-6a top view 1 2 3 4 6 5 4 vss negative power input pin figure 3 5 vdd positive power input pin 6 vm voltage detection pin between vm and vss (overcurrent detection pin) *1. the nc pin is electrically open. the nc pin can be connected to vdd or vss.
battery protection ic for 1-cell pack rev.9.0 _00 s-8241 series seiko instruments inc. 9 ? absolute maximum ratings table 7 (ta = 25 c unless otherwise specified) item symbol applicable pin rating unit input voltage between vdd and vss v ds vdd v ss ? 0.3 to v ss +12 v vm input pin voltage v vm vm v dd ? 26 to v dd +0.3 v co output pin voltage v co co v vm ? 0.3 to v dd +0.3 v do output pin voltage v do do v ss ? 0.3 to v dd +0.3 v 250 (when not mounted on board) mw sot-23-5 600 *1 mw power dissipation snt-6a p d ? 400 *1 mw operation ambient temperature t opr ? ? 40 to +85 c storage temperature t stg ? ? 40 to +125 c *1. when mounted on board [mounted board] (1) board size: 114.3 mm 76.2 mm t1.6 mm (2) board name: jedec standard51-7 caution the absolute maximum ratings are rated values exceeding whic h the product could suffer physical damage. these values must therefore not be exceeded under any conditions. 0 50 100 150 700 400 0 power diss p ation ( p d ) [ mw ] ambient tem p erature ( ta ) [ c ] 200 600 500 300 100 snt-6a sot-23-5 figure 4 power dissipation of package (when mounted on board)
battery protection ic for 1-cell pack s-8241 series rev.9.0 _00 seiko instruments inc. 10 ? electrical characteristics 1. other than detection delay time (25 c) table 8 (ta = 25 c unless otherwise specified) item symbol condition min. typ. max. unit test condition test circuit detection voltage ? v cu -0.025 v cu v cu +0.025 overcharge detection voltage v cu = 3.9 v to 4.4 v, 5 mv step v cu ta = -5 c to +55 c *1 v cu -0.030 v cu v cu +0.030 v 1 1 when v cl v cu v cl -0.050 v cl v cl +0.050 overcharge release voltage v cu ? v cl = 0 v to 0.4 v, 50 mv step v cl when v cl = v cu v cl -0.025 v cl v cl +0.025 v 1 1 overdischarge detection voltage v dl = 2.0 v to 3.0 v, 100 mv step v dl ? v dl -0.080 v dl v dl +0.080 v 1 1 when v du v dl v du -0.100 v du v du +0.100 overdischarge release voltage v du ? v dl = 0 v to 0.7 v, 100 mv step v du when v du = v dl v du -0.080 v du v du +0.080 v 1 1 overcurrent 1 detection voltage v iov1 = 0.05 v to 0.32v, 5 mv step v iov1 ? v iov1 -0.020 v iov1 v iov1 +0.020 v 2 1 overcurrent 2 detection voltage v iov2 ? 0.4 0.5 0.6 v 2 1 load short-circuiting detection voltage v short vm voltage based on v dd -1.7 -1.3 -0.9 v 2 1 charger detection voltage v cha ? -2.0 -1.3 -0.6 v 3 1 overcharge detection voltage temperature factor *1 t coe1 ta = -5 c to +55 c -0.5 0 0.5 mv/ c ? ? overcurrent 1 detection voltage temperature factor *1 t coe2 ta = -5 c to +55 c -0.1 0 0.1 mv/ c ? ? input voltage, operating voltage input voltage between vdd and vss v ds1 absolute maximum rating -0.3 ? 12 v ? ? input voltage between vdd and vm v ds2 absolute maximum rating -0.3 ? 26 v ? ? operating voltage between vdd and vss v dsop1 internal circuit operating voltage 1.5 ? 8 v ? ? operating voltage between vdd and vm v dsop2 internal circuit operating voltage 1.5 ? 24 v ? ? current consumption power-down function available current consumption during normal operation i ope v dd = 3.5 v, v vm = 0 v 1.0 3.0 5.0 a 4 1 current consumption at power down i pdn v dd = v vm = 1.5 v ? ? 0.1 a 4 1 current consumption power-down function unavailable current consumption during normal operation i ope v dd = 3.5 v, v vm = 0 v 1.0 3.0 5.0 a 4 1 overdischarge current consumption i oped v dd = v vm = 1.5 v 1.0 2.0 3.5 a 4 1 output resistance co pin h resistance r coh v co = 3.0 v, v dd = 3.5 v, v vm = 0 v 0.1 2 10 k 6 1 co pin l resistance r col v co = 0.5 v, v dd = 4.5 v, v vm = 0 v 150 600 2400 k 6 1 do pin h resistance r doh v do = 3.0 v, v dd = 3.5 v, v vm = 0 v 0.1 1.3 6.0 k 7 1 do pin l resistance r dol v do = 0.5 v, v dd = v vm = 1.8 v 0.1 0.5 2.0 k 7 1 vm internal resistance internal resistance between vm and vdd r vmd v dd = 1.8 v, v vm = 0 v 100 300 900 k 5 1 internal resistance between vm and vss r vms v dd = v vm = 3.5 v 50 100 150 k 5 1 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 voltage v 0cha 0 v battery charging available 0.0 0.8 1.5 v 10 1 0 v battery charge inhibiting battery voltage v 0inh 0 v battery charging unav ailable 0.6 0.9 1.2 v 11 1 *1. since products are not screened at high and low temperatures, t he specification for this temperature range is guaranteed by de sign, not tested in production.
battery protection ic for 1-cell pack rev.9.0 _00 s-8241 series seiko instruments inc. 11 2. other than detection delay time (-40 c to +85 c *1 ) table 9 (ta = -40 c to +85 c *1 unless otherwise specified) item symbol condition min. typ. max. unit test condition test circuit detection voltage overcharge detection voltage v cu = 3.9 v to 4.4 v, 5 mv step v cu ? v cu -0.055 v cu v cu +0.040 v 1 1 when v cl v cu v cl -0.095 v cl v cl +0.060 overcharge release voltage v cu ? v cl = 0 v to 0.4 v, 50 mv step v cl when v cl = v cu v cl -0.055 v cl v cl +0.040 v 1 1 overdischarge detection voltage v dl = 2.0 v to 3.0 v, 100 mv step v dl ? v dl -0.120 v dl v dl +0.120 v 1 1 when v du v dl v du -0.140 v du v du +0.140 overdischarge release voltage v du ? v dl = 0 v to 0.7 v, 100 mv step v du when v du = v dl v du -0.120 v du v du +0.120 v 1 1 overcurrent 1 detection voltage v iov1 = 0.05 v to 0.32 v, 5 mv step v iov1 ? v iov1 -0.026 v iov1 v iov1 +0.026 v 2 1 overcurrent 2 detection voltage v iov2 ? 0.37 0.5 0.63 v 2 1 load short-circuiting detection voltage v short vm voltage based on v dd -1.9 -1.3 -0.7 v 2 1 charger detection voltage v cha ? -2.2 -1.3 -0.4 v 3 1 overcharge detection voltage temperature factor *1 t coe1 ta = -40 c to +85 c -0.7 0 0.7 mv/ c ? ? overcurrent 1 detection voltage temperature factor *1 t coe2 ta = -40 c to +85 c -0.2 0 0.2 mv/ c ? ? input voltage, operating voltage input voltage between vdd and vss v ds1 absolute maximum rating -0.3 ? 12 v ? ? input voltage between vdd and vm v ds2 absolute maximum rating -0.3 ? 26 v ? ? operating voltage between vdd and vss v dsop1 internal circuit operating voltage 1.5 ? 8 v ? ? operating voltage between vdd and vm v dsop2 internal circuit operating voltage 1.5 ? 24 v ? ? current consumption power-down function available current consumption during normal operation i ope v dd = 3.5 v, v vm = 0 v 0.7 3.0 6.0 a 4 1 current consumption at power down i pdn v dd = v vm = 1.5 v ? ? 0.1 a 4 1 current consumption power-down function unavailable current consumption during normal operation i ope v dd = 3.5 v, v vm = 0 v 0.7 3.0 6.0 a 4 1 overdischarge current consumption i oped v dd = v vm = 1.5 v 0.6 2.0 4.5 a 4 1 output resistance co pin h resistance r coh v co = 3.0 v, v dd = 3.5 v, v vm = 0 v 0.07 2 13 k 6 1 co pin l resistance r col v co = 0.5 v, v dd = 4.5 v, v vm = 0 v 100 600 3500 k 6 1 do pin h resistance r doh v do = 3.0 v, v dd = 3.5 v, v vm = 0 v 0.07 1.3 7.3 k 7 1 do pin l resistance r dol v do = 0.5 v, v dd = v vm = 1.8 v 0.07 0.5 2.5 k 7 1 vm internal resistance internal resistance between vm and vdd r vmd v dd = 1.8 v, v vm = 0 v 78 300 1310 k 5 1 internal resistance between vm and vss r vms v dd = v vm = 3.5 v 39 100 220 k 5 1 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 voltage v 0cha 0 v battery charging available 0.0 0.8 1.7 v 10 1 0 v battery charge inhibiting battery voltage v 0inh 0 v battery charging unavailable 0.4 0.9 1.4 v 11 1 *1. since products are not screened at high and low temperatures, t he specification for this temperature range is guaranteed by d esign, not tested in production.
battery protection ic for 1-cell pack s-8241 series rev.9.0 _00 seiko instruments inc. 12 3. detection delay time (1) s-8241aba, s-8241abc, s-8241abd, s- 8241abe, s-8241abf, s-8241abg, s-8241abh, s-8241abi, s-8241abk, s-8241abl, s-8241abq, s-8241abt, s-8241abu, s-8241abv, s-8241abx, s-8241abz, s-8241aca, s-8241acb, s-8241ace, s-8241acf, s-8241acg, s-8241ach, s-8241acl, s-8241aco, s-8241acp, s-8241acq, s-8241acr, s-8241acs, s-8241act, s-8241acu, s-8241acx, s-8241a cy, s-8241ada, s-8241add, s-8241adh, s-8241adl, s-8241adm, s-8241adn, s-8241ado, s-8241adq, s-8241ads, s-8241adt, s-8241adv, s-8241adw, s-8241ady, s-8241aec table 10 item symbol condition min. typ. max. unit test condition test circuit delay time (ta = 25c) overcharge detecti on delay time t cu ? 0.7 1.0 1.3 s 8 1 overdischarge detec tion delay time t dl ? 87.5 125 162.5 ms 8 1 overcurrent 1 detection delay time t lov1 ? 5.6 8 10.4 ms 9 1 overcurrent 2 detection delay time t lov2 ? 1.4 2 2.6 ms 9 1 load short-circuiting det ection delay time t short ? ? 10 50 s 9 1 delay time (ta = ? 40c to + 85c) *1 overcharge detecti on delay time t cu ? 0.55 1.0 1.7 s 8 1 overdischarge detec tion delay time t dl ? 69 125 212 ms 8 1 overcurrent 1 detection delay time t iov1 ? 4.4 8 14 ms 9 1 overcurrent 2 detection delay time t iov2 ? 1.1 2 3.4 ms 9 1 load short-circuiting det ection delay time t short ? ? 10 73 s 9 1 *1. since products are not screened at high and lo w temperature, the specif ication for this temper ature range is guaranteed by design, not tested in production. (2) s-8241abb, s-8241abo, s-8241abp, s- 8241abs, s-8241aci, s-8241ack, s-8241acn, s-8241acz, s-8241ade table 11 item symbol condition min. typ. max. unit test condition test circuit delay time (ta = 25c) overcharge detecti on delay time t cu ? 87.5 125 162.5 ms 8 1 overdischarge detec tion delay time t dl ? 21 31 41 ms 8 1 overcurrent 1 detection delay time t lov1 ? 11 16 21 ms 9 1 overcurrent 2 detection delay time t lov2 ? 1.4 2 2.6 ms 9 1 load short-circuiting det ection delay time t short ? ? 10 50 s 9 1 delay time (ta = ? 40c to + 85c) *1 overcharge detecti on delay time t cu ? 69 125 212 ms 8 1 overdischarge detec tion delay time t dl ? 17 31 53 ms 8 1 overcurrent 1 detection delay time t iov1 ? 9 16 27 ms 9 1 overcurrent 2 detection delay time t iov2 ? 1.1 2 3.4 ms 9 1 load short-circuiting det ection delay time t short ? ? 10 73 s 9 1 *1. since products are not screened at high and lo w temperature, the specif ication for this temper ature range is guaranteed by design, not tested in production.
battery protection ic for 1-cell pack rev.9.0 _00 s-8241 series seiko instruments inc. 13 (3) s-8241abw, s-8241aby table 12 item symbol condition min. typ. max. unit test condition test circuit delay time (ta = 25c) overcharge detecti on delay time t cu ? 0.175 0.25 0.325 s 8 1 overdischarge detec tion delay time t dl ? 87.5 125 162.5 ms 8 1 overcurrent 1 detection delay time t lov1 ? 5.6 8 10.4 ms 9 1 overcurrent 2 detection delay time t lov2 ? 1.4 2 2.6 ms 9 1 load short-circuiting det ection delay time t short ? ? 10 50 s 9 1 delay time (ta = ? 40c to + 85c) *1 overcharge detecti on delay time t cu ? 0.138 0.25 0.425 s 8 1 overdischarge detec tion delay time t dl ? 69 125 212 ms 8 1 overcurrent 1 detection delay time t iov1 ? 4.4 8 14 ms 9 1 overcurrent 2 detection delay time t iov2 ? 1.1 2 3.4 ms 9 1 load short-circuiting det ection delay time t short ? ? 10 73 s 9 1 *1. since products are not screened at high and lo w temperature, the specif ication for this temper ature range is guaranteed by design, not tested in production. (4) s-8241abr, s-8241acd table 13 item symbol condition min. typ. max. unit test condition test circuit delay time (ta = 25c) overcharge detecti on delay time t cu ? 1.4 2.0 2.6 s 8 1 overdischarge detec tion delay time t dl ? 87.5 125 162.5 ms 8 1 overcurrent 1 detection delay time t lov1 ? 5.6 8 10.4 ms 9 1 overcurrent 2 detection delay time t lov2 ? 1.4 2 2.6 ms 9 1 load short-circuiting det ection delay time t short ? ? 10 50 s 9 1 delay time (ta = ? 40c to + 85c) *1 overcharge detecti on delay time t cu ? 1.1 2.0 3.4 s 8 1 overdischarge detec tion delay time t dl ? 69 125 212 ms 8 1 overcurrent 1 detection delay time t iov1 ? 4.4 8 14 ms 9 1 overcurrent 2 detection delay time t iov2 ? 1.1 2 3.4 ms 9 1 load short-circuiting det ection delay time t short ? ? 10 73 s 9 1 *1. since products are not screened at high and lo w temperature, the specif ication for this temper ature range is guaranteed by design, not tested in production.
battery protection ic for 1-cell pack s-8241 series rev.9.0 _00 seiko instruments inc. 14 (5) s-8241adf, s-8241adg table 14 item symbol condition min. typ. max. unit test condition test circuit delay time (ta = 25c) overcharge detecti on delay time t cu ? 0.175 0.25 0.325 ms 8 1 overdischarge detec tion delay time t dl ? 21 31 41 ms 8 1 overcurrent 1 detection delay time t lov1 ? 11 16 21 ms 9 1 overcurrent 2 detection delay time t lov2 ? 1.4 2 2.6 ms 9 1 load short-circuiting det ection delay time t short ? ? 10 50 s 9 1 delay time (ta = ? 40c to + 85c) *1 overcharge detecti on delay time t cu ? 0.138 0.25 0.425 s 8 1 overdischarge detec tion delay time t dl ? 17 31 53 ms 8 1 overcurrent 1 detection delay time t iov1 ? 9 16 27 ms 9 1 overcurrent 2 detection delay time t iov2 ? 1.1 2 3.4 ms 9 1 load short-circuiting det ection delay time t short ? ? 10 73 s 9 1 *1. since products are not screened at high and lo w temperature, the specif ication for this temper ature range is guaranteed by design, not tested in production. (6) s-8241aee table 15 item symbol condition min. typ. max. unit test condition test circuit delay time (ta = 25c) overcharge detecti on delay time t cu ? 0.7 1.0 1.3 s 8 1 overdischarge detec tion delay time t dl ? 87.5 125 162.5 ms 8 1 overcurrent 1 detection delay time t lov1 ? 11 16 21 ms 9 1 overcurrent 2 detection delay time t lov2 ? 1.4 2 2.6 ms 9 1 load short-circuiting det ection delay time t short ? ? 10 50 s 9 1 delay time (ta = ? 40c to + 85c) *1 overcharge detecti on delay time t cu ? 0.55 1.0 1.7 s 8 1 overdischarge detec tion delay time t dl ? 69 125 212 ms 8 1 overcurrent 1 detection delay time t iov1 ? 9 16 27 ms 9 1 overcurrent 2 detection delay time t iov2 ? 1.1 2 3.4 ms 9 1 load short-circuiting det ection delay time t short ? ? 10 73 s 9 1 *1. since products are not screened at high and lo w temperature, the specif ication for this temper ature range is guaranteed by design, not tested in production.
battery protection ic for 1-cell pack rev.9.0 _00 s-8241 series seiko instruments inc. 15 ? test circuits caution unless otherwise specified, the output voltage levels ?h? and ?l? at co pin (v co ) and do pin (v do ) are judged by the threshold voltage (1.0 v) of the n-channel fet. judge the co pin level with respect to v vm and the do pin level with respect to v ss . (1) test condition 1, test circuit 1 (overcharge detection voltage, overcharge release voltage, overdischarge detection voltage, overdischarge release voltage) the overcharge detection voltage (v cu ) is defined by the voltage between vdd and vss at which v co 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 (v cl ) is defined by the voltage between vdd and vss at which v co goes ?h? from ?l? when the voltage v1 is then gradually decreased. gradually decreasing the voltage v1, the overdischarge detection voltage (v dl ) is defined by the voltage between vdd and vss at which v do goes ?l? from ?h?. the overdischarge release voltage (v du ) is defined by the voltage between vdd and vss at which v do goes ?h? from ?l? when the volt age v1 is then gradually increased. (2) test condition 2, test circuit 1 (overcurrent 1 detection voltage, overcurrent 2 detect ion voltage, load short-circuiting detection voltage) the overcurrent 1 detection voltage (v iov1 ) is defined by the voltage between vdd and vss at which v do 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 (v iov2 ) is defined by the voltage between vdd and vss at which v do 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 (v short ) is defined by the voltage between vdd and vss at which v do 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) test condition 3, test 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 = (v du +v dl ) / 2 (within overdischarge hysteresis, overdischar ge condition), then decrease v2 from 0 v gradually. the voltage between vm and vss at which v do goes ?h? from ?l? is the charger detection voltage (v cha ). ? applied only for products wit hout 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 v co goes ?l? from ?h? is the abnormal charge current detection voltage. t he abnormal charge current detection voltage has the same value as the charger detection voltage (v cha ). (4) test condition 4, test 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 i dd flowing through vdd pin is the normal operation consumption current (i ope ). ? for products with power-down function set v1 = v2 = 1.5 v under overdi scharge condition. the current i dd flowing through vdd pin is the power-down current consumption (i pdn ). ? for products without power-down function set v1 = v2 = 1.5 v under overdi scharge condition. the current i dd flowing through vdd pin is the overdischarge current consumption (i oped ).
battery protection ic for 1-cell pack s-8241 series rev.9.0 _00 seiko instruments inc. 16 (5) test condition 5, test circuit 1 (internal resistance between vm and vdd, internal resistance between vm and vss) set v1 = 1.8 v and v2 = 0 v under overdi scharge condition. measure current i vm flowing through vm pin. 1.8v / |i vm | gives the internal resistance (r vmd ) between vm and vdd. set v1 = v2 = 3.5 v under overcurr ent condition. measure current i vm flowing through vm pin. 3.5 v / |i vm | gives the internal resistance (r vms ) between vm and vss. (6) test condition 6, test 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 i co flowing through co pin. 0.5 v / |i co | is the co pin h resistance (r coh ). set v1 = 4.5 v, v2 = 0 v and v3 = 0.5 v under overcharge condition. measure current i co flowing through co pin. 0.5 v / |i co | is the co pin l resistance (r col ). (7) test condition 7, test 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 i do flowing through do pin. 0.5 v / |i do | gives the do pin h resistance (r doh ). set v1 = 1.8 v, v2 = 0 v and v4 = 0.5 v under overdischarge condition. measure current i do flowing through do pin. 0.5 v / |i do | gives the do pin l resistance (r dol ). (8) test condition 8, test 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 v cu - 0.2 v and increase v1 to the ov ercharge detection voltage v cu + 0.2 v momentarily (within 10 s). the time after v1 becomes the overcharge detection voltage until v co goes "l" is the overcharge detection delay time (t cu ). set v1 = 3.5 v and v2 = 0 v under normal condition. de crease v1 gradually to over discharge detection voltage v dl + 0.2 v and decrease v1 to the overdischarge detection voltage v dl - 0.2 v momentarily (within 10 s). the time after v1 becomes the overdischarge detection voltage v dl until v do goes "l" is the overdischarge detection delay time (t dl ). (9) test condition 9, test 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 = 3.5 v and v2 = 0 v under normal condition. in crease v2 from 0 v to 0.35 v momentarily (within 10 s). the time after v2 becomes overcurrent 1 detection voltage (v iov1 ) until v do goes "l" is overcurrent 1 detection delay time (t iov1 ). set v1 = 3.5 v and v2 = 0 v under normal condition. in crease v2 from 0 v to 0.7 v momentarily (within 1 s). the time after v2 becomes overcurrent 1 detection voltage (v iov1 ) until v do goes "l" is overcurrent 2 detection delay time (t iov2 ). caution 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. in crease v2 from 0 v to 3.0 v momentarily (within 1 s). the time after v2 becomes the load shor t-circuiting detection voltage (v short ) until v do goes "l" is the load short-circuiting detection delay time (t short ). set v1 = 3.5 v and v2 = 0 v under normal condition. decr ease v2 from 0 v to -2.5 v momentarily (within 10 s). the time after v2 becomes the charger detection voltage (v cha ) until v co goes "l" is the abnormal charge current detection delay time. the abnormal charge current detection delay time has the same value as t he overcharge detection delay time.
battery protection ic for 1-cell pack rev.9.0 _00 s-8241 series seiko instruments inc. 17 (10) test condition 10, test circuit 1 (product with 0 v battery charging function) (0 v battery charge start charger voltage) set v1 = v2 = 0 v and decrease v2 gradually. the voltage between vdd and vm at which v co goes ?h? (v vm + 0.1 v or higher) is the 0 v battery charge start charger voltage (v 0cha ). (11) test condition 11, test circuit 1 (product with 0 v battery charge inhibiting function) (0 v battery charge inhibiting battery voltage) set v1 = 0 v and v2 = -4 v. increase v1 gr adually. the voltage between vdd and vss at which v co goes ?h? (v vm + 0.1 v or higher) is the 0 v battery charge inhibiting battery voltage (v 0inh ). vss do co vdd v1 i dd vm v2 i vm a v a v do com a i do v v co a i co v4 v3 s-8241 series test circuit 1 figure 5
battery protection ic for 1-cell pack s-8241 series rev.9.0 _00 seiko instruments inc. 18 ? operation remark refer to the ? ? battery protection ic connection example ?. 1. normal status the s-8241 monitors the voltage of t he battery connected to vdd and vss pins and the voltage difference between vm and vss pins to control charging and disc harging. when the battery voltage is in the range from the overdischarge detection voltage (v dl ) to the overcharge detection voltage (v cu ), and the vm pin voltage is in the range from the charger detection voltage (v cha ) to the overcurrent 1 detection voltage (v iov1 ) (the current flowing through the battery is equal to or lower than a specified value) , the ic turns both the charging and dischar ging control fets on. this status is called normal status and in this status c harging and discharging can be carried out freely. 2. overcurrent status when the discharging current becomes equal to or higher than a specified value (t he vm pin voltage is equal to or higher than the overcurrent detecti on voltage) during discharging under normal st atus and the state continues for the overcurrent detection delay time or longer, the s-8241 turns the discharging contro l fet off to stop discharging. this status is called overcurrent status. (t he overcurrent includes overcurrent 1, ov ercurrent 2, or load short-circuiting.) the vm and vss pins are shorted internally by the r vms resistor under the overcurr ent status. when a load is connected, the vm pi n voltage equals the v dd voltage due to the load. the overcurrent status returns to the normal status when the load is re leased and the impedance between the eb+ and eb- pins (see the figure 12 for a connection example) becomes higher than the automatic re coverable impedance (see the equation [1] below). when the load is removed, the vm pin goes back to the v ss potential since the vm pin is shorted the vss pin with the r vms resistor. detecting that the vm pin potential is lower than the overcurr ent 1 detection voltage (v iov1 ), the ic returns to the normal status. automatic recoverable impedance = {battery voltage / (minimum value of overcu rrent 1 detection voltage) ? 1} x (r vms maximum value) --- [1] example: battery voltage = 3.5 v and overcurrent 1 detection voltage (v iov1 ) = 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 over current 1 detection voltage settings. determine the minimum value of the open load using the above equation [1] to have automatic recovery from the overcurrent status work after che cking the overcurrent 1 detecti on voltage setting for the ic.
battery protection ic for 1-cell pack rev.9.0 _00 s-8241 series seiko instruments inc. 19 3. overcharge status when the battery voltage becomes higher than the overcharge detection voltage (v cu ) during charging under normal status and the stat e continues for the overc harge detection delay time (t cu ) or longer, the s-8241 turns the charging control fet off to stop charging. this status is called t he overcharge status. the overcharge status is released in the following two cases ((1) and (2)) depending on the products with and without overcharge hysteresis: products with overcharge hysteresis (overcharge detection voltage (v cu ) > overcharge release voltage (v cl )) (1) when the battery voltage drops bel ow the overcharge release voltage (v cl ), the s-8241 turns t he charging control fet on and returns to the normal status. (2) when a load is connected and dischargi ng starts, the s-8241 turns the chargi ng control fet on and returns to the normal status. the release mechanism is as follows: t he discharging current flows th rough an internal parasitic diode of the charging fet immediately after a load is connected and discharging star ts, and the vm pin voltage increases about 0.7 v (vf voltage of t he diode) from the vss pin voltage moment arily. the ic detects this voltage (being higher than the overcu rrent 1 detection voltage) and releases the overcharge st atus. consequently, in the case that the battery voltage is equal to or lower than the over charge detection voltage (v cu ), the ic returns to the normal status immediately, but in the case the battery voltage is higher than the overchar ge detection voltage (v cu ), the ic does not return to the norma l status until the battery voltage drops below the overcharge detection voltage (v cu ) 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 connect ed and discharging starts, the ic does not return to the normal status. remark if the battery is charged to a voltage hi gher than the overchar ge detection voltage (v cu ) and the battery voltage does not drop below the overcharge detection voltage (v cu ) 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 ov ercharge detection voltage (v cu ). 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 c onnected, 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 (v cu ) = overcharge release voltage (v cl )) (1) when the battery voltage drops bel ow the overcharge release voltage (v cl ), the s-8241 turn t he charging control fet on and returns to the normal status. (2) when a load is connected and dischargi ng starts, the s-8241 turns the chargi ng control fet on and returns to the normal status. the release mechanism is explained as fo llows : the discharging current flows through an internal parasitic diode of the charging fet immediately after a load is connec ted 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 overcu rrent 1 detection voltage), the ic increas es the overcharge det ection voltage about 50 mv, and releases the overcharge stat us. consequently, when the battery vo ltage is equal to or lower than the overcharge detection voltage (v cu ) + 50 mv, the s-8241 immediately returns to the normal status. but the battery voltage is higher than the ov ercharge detection voltage (v cu ) + 50 mv, the s-8241 does not return to the normal status until the battery voltage drops below the ov ercharge detection voltage (v cu ) + 50 mv even if a load is connected. if the vm pin voltage is equal to or lower than the overcurr ent 1 detection voltage when a load is connected and discharging starts , the s-8241 does not return to the normal status. remark if the battery is charged to a voltage hi gher than the overchar ge detection voltage (v cu ) and the battery voltage does not drop below the overcharge detection voltage (v cu ) + 50 mv even when a heavy load, which causes an overcurrent, is connected, the overcurr ent 1 and overcurrent 2 do not work until the battery voltage drops bellow t he overcharge detection voltage (v cu ) + 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 overcu rrent is connected, t he overcurrent 1 and overcurrent 2 work. detection of load short-circuiting wor ks regardless of the battery voltage.
battery protection ic for 1-cell pack s-8241 series rev.9.0 _00 seiko instruments inc. 20 4. overdischarge status with power-down function when the battery voltage drops below the overdischarge detection voltage (v dl ) during discharging under normal status and it continues for the overdischarge detection delay time (t dl ) or longer, the s-8241 turns the discharging control fet off and stops discharging. this status is called overdischarge status. after the discharging control fet is turned off, the vm pin is pulled up by the r vmd resistor between vm and vdd in the ic. m eanwhile the potential difference between vm and vdd drops below 1.3 v (typ.) (the l oad short-circuiting detection voltage), curr ent consumption of the ic is reduced to the power-down current consumption (i pdn ). this status is called power-down status. the vm and vdd pins are shorted by the r vmd resistor in the ic under the ov erdischarge and power-down statuses. the power-down status is released when a charger is connec ted and the potential diffe rence between vm and vdd becomes 1.3 v (typ.) or higher (load short- circuiting detection voltage). at this ti me, the fet is still off. when the batter y voltage becomes the overdi scharge detection voltage (v dl ) or higher *1 , the s-8241 turns the fet on and changes to the normal status from t he overdischarge status. *1. if the vm pin voltage is no less t han the charger detection voltage (v cha ), when the battery under overdischarge status is connected to a char ger, the overdischarge status is released (the discharging c ontrol fet is turned on) as usual, provided that the battery voltage r eaches the overdischarge release voltage (v du ) or higher. without power-down function when the battery voltage drops below the overdischarge detection voltage (v dl ) during discharging under normal status and it continues for the overdischarge detection delay time (t dl ) 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 r vmd resistor between vm and vdd in the ic. meanwh ile the potential differenc e between vm and vdd drops below 1.3 v (typ.) (the load short-circuiting detection voltage), current consumption of the ic is reduced to t he overdischarge current consumption (i oped ). this status is called ov erdischarge status. the vm and v dd pins are shorted by the r vmd resistor in the ic under the overdischarge status. when a charger is connected, t he overdischarge status is re leased in the same way as explained above in respect to products having the power-down f unction. for products without the power-down function, in addition, even if the charger is not connected, the s-8241 turns t he discharging control fet on and changes to the normal status from the overdischarge status provi ded that the load is disconnec ted and that the potential difference between vm and vss drops below the overcurrent 1 detection voltage (v iov1 ), since the vm pin is pulled down by the r vms resistor between vm and vss in the ic when the battery voltage reaches the overdischarge release voltage (v du ) or higher. 5. charger detection if the vm pin voltage is lower t han the charger detection voltage (v cha ) when a battery in overdischarge status is connected to a charger, overdischarge hyst eresis is released, and when the batte ry voltage becomes equal to or higher than the overdischar ge detection voltage (v dl ), the overdischarge stat us is released (the discharging control fet is turned on). this action is called char ger detection. (the charger detection r educes 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 (v cha ) when a battery in overdischarge status is connected to a charger, the overdischarge status is released (the discharging control fet is turned on) as usual, when the battery voltage reaches the overdischarge release voltage (v du ) or higher.
battery protection ic for 1-cell pack rev.9.0 _00 s-8241 series seiko instruments inc. 21 6. abnormal charge current detection if the vm pin voltage drops below the charger detection voltage (v cha ) during charging under t he normal status and it continues for the overchar ge detection delay time (t cu ) or longer, the s-8241 turns the charging control fet off and stops charging. this action is call ed 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 c harger detection voltage (v cha ). when an abnormal charge current flows into a battery in the overdischarge status, the s-8241 consequently turns the charging control fet off and stops charging after the battery voltage becomes the overdi scharge detection voltage or higher (do pi n voltage becomes ?h?) and the overcharge detection delay time (t cu ) elapses. abnormal charge current detection is released when t he voltage difference between vm pin and vss pin becomes lower than the charger detection voltage (v cha ) by separating the charger. since the 0 v battery charging function has higher prio rity than the abnormal charge current detection function, abnormal charge current may not be detect ed by the product with the 0 v battery charging function while the battery voltage is low. 7. delay circuits the detection delay times are determined by dividing a clock of approximately 2 khz by the counter. [example] overcharge detection delay time (= abno rmal charge current detection delay time): 1.0 s overdischarge detection delay time: 125 ms overcurrent 1 detection delay time: 8 ms overcurrent 2 detection delay time: 2 ms caution 1. 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 6. 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. d o pin v m p in v dd v dd time t ime v iov1 v ss v ss v iov2 overcurrent 2 detection dela y time ( t i o v2 ) figure 6
battery protection ic for 1-cell pack s-8241 series rev.9.0 _00 seiko instruments inc. 22 2. 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 status changes to the power-down status 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 status. 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 status changes to the overdischarge status 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 overdischarge status. 8. 0 v battery charging function this function enables the char ging of a connected battery whose voltage is 0 v by self-discharge. when a charger having 0 v battery start charging charger voltage (v 0cha ) or higher is connected bet ween eb+ and eb- pins, the charging control fet gate is fixed to v dd potential. when the vo ltage between the gat e 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 dischar ging control fet. if the battery volt age becomes equal to or higher than the overdischarge release voltage (v du ), the normal status returns. caution 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 0 v 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 status in which discharging is possible. in this case, set the vm pin voltage equal to the v ss voltage (short the vm and vss pins or connect a ch arger) to enter the normal status. 9. 0 v battery charge inhibiting function this function forbids the charging of a connected battery which is short-circuit ed internally (0 v battery). when the battery voltage becomes 0.9 v (typ.) or lo wer, the charging control fe t gate is fixed to eb- potential to forbid charging. charging can be performed, when the battery voltage is the 0 v battery charge inhibiting voltage (v 0inh ) or higher. caution 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. when a battery is connected to the ic for the first time, the ic may not enter the normal status in which discharging is possible. in this case, set the vm pin voltage equal to the v ss voltage (short the vm and vss pins or connect a ch arger) to enter the normal status.
battery protection ic for 1-cell pack rev.9.0 _00 s-8241 series seiko instruments inc. 23 ? timing chart (1) overcharge and overdischarge detection (for products with power-down function) v cu v cl v du v dl v dd v ss v dd v ss v dd v iov1 v ss v cha status (2) (1) (1) remark (1) : normal status, (2) : overcharge status, (3) : overdischarge status, (4) : overcurrent status the charger is assumed to charge with a constant current. battery voltage do pin co pin vm pin charger connected load connected overcharge detection delay time (t cu ) overdischarge detection delay time (t dl ) (3) (1) figure 7 (2) overcharge and overdischarge detection (for products without power-down function) v cu v cl v du v dl battery voltage do pin v dd v ss v dd v ss v dd v iov1 v ss v cha co pin vm pin charger connected overcharge detection delay time (t cu ) load connected status (2) ( 1 ) remark (1) : normal status, (2) : overcharge status, (3) : overdischarge status, (4) : overcurrent status the charger is assumed to charge with a constant current. ( 1 ) (3) ( 1 ) (3) ( 1 ) overdischarge detection delay time (t dl ) overdischarge detection delay time (t dl ) figure 8
battery protection ic for 1-cell pack s-8241 series rev.9.0 _00 seiko instruments inc. 24 (3) overcurrent detection figure 9 (4) charger detection v cu v cl v du v dl v dd v ss v dd v ss v dd v ss v cha overdischarge detection delay time (t dl ) if vm pin voltage < v cha overdischarge is released at overdischarge detection voltage (v dl ) (1) (3) (1) battery voltage do pin co pin vm pin charger connection load connection mode note: (1) normal mode, (2) overcharge mode, (3) overdischarge mode, (4) overcurrent mode the charger is assumed to charge with constant current. figure 10 v cu v cl v du v dl v dd v ss v dd v ss (1) (4) (1) (4) (1) (4) (1) v dd v iov1 v ss v short v iov2 overcurrent 2 detection delay time (t iov2 ) load short-circuiting detection delay time (t short ) battery voltage do pin co pin vm pin charger connection load connection status remark (1) : normal status, (2) : overcharge status, (3) : overdischarge status, (4) : overcurrent status the charger is assumed to charge with constant current. overcurrent 1 detection delay time (t iov1 ) status remark (1) : normal status, (2) : overcharge status, (3) : overdischarge status, (4) : overcurrent status the charger is assumed to charge with constant current.
battery protection ic for 1-cell pack rev.9.0 _00 s-8241 series seiko instruments inc. 25 (5) abnormal charge current detection a bnormal charging current detection delay time ( = overcharge detection delay time (t cu )) overdischarge detection delay time (t dl ) (3) (1) (2) (1) (1) battery voltage do pin co pin vm pin charger connection load connection mode note: (1) normal mode, (2) overcharge mode, (3) overdischarge mode, (4) overcurrent mode the charger is assumed to charge with constant current. v cu v cl v du v dl v dd v ss v dd v ss v dd v ss v cha figure 11 status remark (1) : normal status, (2) : overcharge status, (3) : overdischarge status, (4) : overcurrent status the charger is assumed to charge with constant current.
battery protection ic for 1-cell pack s-8241 series rev.9.0 _00 seiko instruments inc. 26 ? battery protection ic connection example r1 : 470 battery c1 : 0.1 f vss do vdd co vm s-8241 series fet1 fet2 eb ? eb + r2 : 1 k figure 12 table 16 constants for external components symbol parts purpose typ. min. max. remarks fet1 nch mos_fet discharge control ? ? ? 0.4 v threshold voltage overdischarge detection voltage. *1 withstand voltage between gate and source charger voltage *2 fet2 nch mos_fet charge control ? ? ? 0.4 v threshold voltage overdischarge detection voltage. *1 withstand voltage between gate and source charger voltage *2 r1 resistor protection for esd and power fluctuation 470 300 r2 value relation r1 r2 should be maintained. *3 c1 capacitor protection for power fluctuation 0.1 f 0.01 f 1.0 f install a capacitor of 0.01 f or higher between vdd and vss. *4 r2 resistor protection for charger reverse connection 1 k 300 1.3 k to suppress current flow caused by reverse connection of a charger, set the resistance within the range from 300 to 1.3 k . *5 *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 connect ed reversely, current flows from the charger to the ic and th e 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 0.01 f, 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, th e example of connection shown above and the constant do not guarantee proper operation. perform thorough evaluation using the actual application to set the constant.
battery protection ic for 1-cell pack rev.9.0 _00 s-8241 series seiko instruments inc. 27 ? 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 dissi pation of the package. ? do not apply an electrostatic discharge to this ic that ex ceeds 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.
battery protection ic for 1-cell pack s-8241 series rev.9.0 _00 seiko instruments inc. 28 ? characteristics (typical data) 1. detection/release voltage temperature characteristics 4.23 4.25 4.27 4.29 4.31 4.33 -50 -25 0 25 50 75 100 ta(c) v cu (v) ove rcha rge de te ctio n voltag e vs. te mper ature 4.13 4.15 4.17 4.19 4.21 4.23 -50 -25 0 25 50 75 100 ta(c) v cl (v) overcharge release voltage vs. temperature 2.20 2.24 2.28 2.32 2.36 2.40 -50 -25 0 25 50 75 100 ta(c) v dl (v) overdischarge detection voltage vs. temperature 2.30 2.34 2.38 2.42 2.46 2.50 -50 -25 0 25 50 75 100 ta(c) v du (v) overdischarge release voltage vs. temperature 0.090 0.095 0.100 0.105 0.110 -50 -25 0 25 50 75 100 ta(c) v iov1 (v) overcurrent 1 detection voltage vs. temperature 0.40 0.45 0.50 0.55 0.60 -50 -25 0 25 50 75 100 ta(c) v iov2 (v) overcurrent 2 detection voltage vs. temperature 2. current consumption temperature characteristics 0 1 2 3 4 5 6 -25 0 25 50 75 ta(c) i ope ( a) current consumption vs. te mperature in normal mode -50 100 0.00 0.02 0.04 0.06 0.08 0.10 -50 -25 0 25 50 75 100 ta(c) i pdn ( a) current consumption vs. temperature in power-down mode
battery protection ic for 1-cell pack rev.9.0 _00 s-8241 series seiko instruments inc. 29 3. current consumption power voltage characteristics (ta = 25c) current consumption ? power supply volatge dependency 0 5 10 15 20 0 2 4 6 8 10 v dd (v) i ope ( a) v m = v ss 4. detection/release delay time temperature characteristics 0.0 0.5 1.0 1.5 2.0 -50 -25 0 25 50 75 100 ta(c) t cu (s) overcharge detection delay time vs. temperature 0.0 0.2 0.4 0.6 0.8 1.0 -50 -25 0 25 50 75 100 ta(c) t cl (ms) overcharge release delay time vs. temperature 0 50 100 150 200 250 -50 -25 0 25 50 100 ta(c) t dl (ms) overdischarge detection delay time vs. temperature 75 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 -50 -25 0 25 50 75 100 ta(c) t cu (s) overdischarge release delay time vs. temperature 0 4 8 12 16 -50 -25 0 25 50 75 100 ta(c) t iov1 (ms) overcurrent 1 detection delay time vs. temperature 0 100 200 300 400 500 -50 -25 0 25 50 75 100 ta(c) t iov1 ( s) release overcurrent 1 release delay time vs. temperature
battery protection ic for 1-cell pack s-8241 series rev.9.0 _00 seiko instruments inc. 30 0 1 2 3 4 -50 -25 0 25 50 75 100 ta(c) t iov2 (ms) overcurrent 2 detection delay time vs. temperature 0 10 20 30 40 50 -50 -25 0 25 50 75 100 ta(c) t short ( s) load short-circuiting delay time vs. temperature 5. delay time power-voltage characteristics (ta = 25c) overcurrent 1 detection delay time vs. power supply voltage dependency 0 4 8 12 16 2.0 2.5 3.0 3.5 4.0 4.5 5.0 v dd (v) t iov1 (ms) overcurrent 2 detection delay time vs. power supply voltage dependency 0 1 2 3 4 2.0 2.5 3.0 3.5 4.0 4.5 5.0 v dd (v) t iov2 (ms) 6. co pin/do pin output current characteristics (ta = 25c) co pin source current characteristics -1.4 -1.2 -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0 1 2 3 4 v co (v) i co (ma) v dd = 3.5 v, v ss = v m = 0 v co pin sink current characteristics 0 2 4 6 8 10 12 0 1 2 3 4 5 v co (v) i co ( a) v dd = 4.5 v, v ss = v m = 0 v 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 0 1 2 3 4 v do (v) i do (ma) v dd = 3.5 v, v ss = v m = 0 v do pin sink current characteristics 0.0 0.5 1.0 1.5 2.0 2.5 0.0 0.5 1.0 1.5 2.0 v do (v) i do (ma) v dd = 1.8 v, v ss = v m = 0 v

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www.sii-ic.com ? the information described herein is subject to change without notice. ? seiko instruments inc. is not responsible for any pr oblems caused by circuits or diagrams described herein whose related industrial properties, patents, or ot her rights belong to third parties. the application circuit examples explain typical applications of the products, and do not guarant ee the success of any specific mass-production design. ? when the products described herein are regulated produ cts subject to the wassenaar arrangement or other agreements, they may not be exported without authoriz ation from the appropriate governmental authority. ? use of the information described he rein for other purposes and/or repr oduction or copying without the express permission of seiko instrum ents inc. is strictly prohibited. ? the products described herein cannot be used as par t 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 oc cur. 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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