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rev.4.1 _01 battery protection ic for 1- cell pack s-8241 series seiko instruments inc. 1 the s-8241 series is a series of lit hium-ion/lithium polymer rechargeable battery protection ics incorporat ing high-accuracy voltage detection circuits and delay circuits. these ics are suitable for protection of single-cell lithium ion/lithium polymer battery packs from overc harge, 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 c to +55 c) ? overcharge release voltage 3.8 v to 4.4 v *1 accuracy of 50 mv *1. overcharge release voltage = overcharge detection voltage - over charge hysteresis the overcharge hysteresis can be selected in the range 0.0, or 0.1 to 0.4 v in 50mv steps. (however, selection "overchar ge release voltage<3.8 v" is enabled.) ? 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 *2. overdischarge release voltage = overdischarge detection voltage + over discharge hysteresis the overdischarge hysteresis can be select ed 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: t cu ; overdischarge: t dl ; overcurrent 1: t lov1 ; overcurrent 2: t lov2 ) are generated by an internal circuit. (external capacitor s 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 power-down function can be selected. (7) charger detection function and abnor mal 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 vo ltage at co pin goes low. (abnormal charge current detection function) (8) low current consumption ? operation: 3.0 a typ. 5.0 a max. ? power-down mode: 0.1 a max. (9) wide operating temperature range: ? 40 to +85 c (10) small package sot-23-5, 5-pin son(a) ? applications ? lithium-ion rechargeable battery packs ? lithium- polymer rechargeable battery packs ? packages package name drawing code package tape reel sot-23-5 mp005-a mp005-a mp005-a 5-pin son(a) pn 005-a pn005-a pn005-a
battery protection ic for 1-cell pack s-8241 series rev.4.1 _01 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 block diagram ? product code structure 1. product name ic direction in tape specifications * 1 t2 : sot-23-5 tf : 5-pin son(a) product name (abbreviation) *2 package name (abbreviation) mc : sot-23-5 pn : 5-pin son(a) serial code assigned from ba to zz in alphabetical order s-8241a xx xx - xxx xx *1 refer to the taping specific ations at the end of this book. *2 refer to the product name list.
battery protection ic for 1-cell pack rev.4.1 _01 s-8241 series seiko instruments inc. 3 2. product name list model no./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 ] 0v battery charging function delay time combi- nation *1 power down function s-8241abamc-gba-t2 4.275 v 4.075 v 2.3 v 2. 9 v 0.100 v unavailable (1) available s-8241abbmc-gbb-t2 4.280 v 3.980 v 2.3 v 2.4 v 0.125 v available (2) available s-8241abcmc-gbc-t2 4.350 v 4.100 v 2.3 v 2.8 v 0.075 v unavailable (1) available s-8241abdmc-gbd-t2 s-8241abdpn-kbd-tf 4.275 v 4.175 v 2.3 v 2.4 v 0.100 v available (1) available s-8241abemc-gbe-t2 4.295 v 4.095 v 2.3 v 3. 0 v 0.200 v unavailable (1) available s-8241abfmc-gbf-t2 4.325 v 4.075 v 2.5 v 2. 9 v 0.100 v unavailable (1) available s-8241abgmc-gbg-t2 4.200 v 4.100 v 2.3 v 3. 0 v 0.100 v unavailable (1) available s-8241abhmc-gbh-t2 4.325 v 4.125 v 2.3 v 2. 3 v 0.100 v available (1) available s-8241abimc-gbi-t2 4.280 v 4.080 v 2.3 v 2. 3 v 0.160 v unavailable (1) available s-8241abkmc-gbk-t2 4.325 v 4.075 v 2.5 v 2. 9 v 0.150 v unavailable (1) available s-8241ablmc-gbl-t2 4.320 v 4.070 v 2.5 v 2. 9 v 0.100 v unavailable (1) available s-8241abnpn-kbn-tf 4.350 v 4.050 v 2.35 v 2. 65 v 0.150 v available (1) available s-8241abomc-gbo-t2 4.350 v 4.15 v 2.3 v 3.0 v 0.150 v available (2) available s-8241abpmc-gbp-t2 4.350 v 4.15 v 2.3 v 3. 0 v 0.200 v available (2) available s-8241abqmc-gbq-t2 4.280 v 4.080 v 2.3 v 2. 3 v 0.130 v unavailable (1) available s-8241abspn-kbs-tf 4.350 v 4.150 v 2.35 v 2.65 v 0.200 v available (2) available s-8241abtpn-kbt-tf 4.300 v 4.100 v 2.3 v 2. 3 v 0.100 v available (1) available s-8241abumc-gbu-t2 4.200 v 4.100 v 2.3 v 2. 3 v 0.150 v unavailable (1) available s-8241abvmc-gbv-t2 4.295 v 4.095 v 2.3 v 2. 3 v 0.130 v available (1) available s-8241abwmc-gbw-t2 4.280 v 4.080 v 2.3 v 2. 3 v 0.130 v unavailable (3) available s-8241abxmc-gbx-t2 s-8241abxpn-kbx-tf 4.350 v 4.000 v 2.6 v 3.3 v 0.200 v unavailable (1) available s-8241abymc-gby-t2 4.220 v 4.220 v 2.3 v 2. 3 v 0.200 v available (3) available s-8241abzpn-kbz-tf 4.275 v 4.075 v 2.3 v 2. 4 v 0.140 v available (1) available s-8241acamc-gca-t2 s-8241acapn-kca-tf 4.280 v 4.080 v 2.3 v 2.3 v 0.200 v available (1) available s-8241acbmc-gcb-t2 4.300 v 4.100 v 2.3 v 2. 3 v 0.150 v available (1) available s-8241acdmc-gcd-t2 4.275 v 4.075 v 2.3 v 2. 3 v 0.100 v unavailable (4) available s-8241acemc-gce-t2 4.295 v 4.095 v 2.3 v 2. 3 v 0.080 v available (1) available s-8241acfmc-gcf-t2 4.295 v 4.095 v 2.3 v 2. 3 v 0.090 v available (1) available s-8241acgmc-gcg-t2 s-8241acgpn-kcg-tf 4.295 v 4.095 v 2.3 v 2.3 v 0.060 v available (1) available s-8241achmc-gch-t2 4.280 v 4.080 v 2.6 v 2. 6 v 0.200 v available (1) available s-8241acimc-gci-t2 4.350 v 4.150 v 2.05 v 2. 75 v 0.200 v available (2) available s-8241acjpn-kcj-tf 4.300 v 4.100 v 2.3 v 2. 3 v 0.120 v available (1) available s-8241ackmc-gck-t2 4.350 v 4.150 v 2.0 v 2. 0 v 0.200 v available (2) available s-8241aclmc-gcl-t2 4.200 v 4.200 v 2.5 v 3. 0 v 0.100 v available (1) available s-8241acnmc-gcn-t2 s-8241acnpn-kcn-tf 4.350 v 4.150 v 2.1 v 2.2 v 0.200 v available (2) available
battery protection ic for 1-cell pack s-8241 series rev.4.1 _01 seiko instruments inc. 4 model no./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 ] 0v battery charging function delay time combi- nation *1 power down function s-8241acomc-gco-t2 4.100 v 3.850 v 2.5 v 2. 9 v 0.150 v unavailable (1) unavailable s-8241acpmc-gcp-t2 4.325 v 4.075 v 2.5 v 2.9 v 0.150 v unavailable (1) unavailable s-8241acqmc-gcq-t2 4.275 v 4.175 v 2.3 v 2. 4 v 0.100 v available (1) unavailable s-8241acrmc-gcr-t2 4.350 v 4.150 v 2.3 v 3. 0 v 0.100 v available (1) unavailable s-8241acsmc-gcs-t2 4.180 v 3.930 v 2.5 v 2.9 v 0.150 v unavailable (1) unavailable s-8241actmc-gct-t2 4.100 v 4.000 v 2.5 v 2.9 v 0.150 v unavailable (1) unavailable s-8241acumc-gcu-t2 4.180 v 4.080 v 2.5 v 2.9 v 0.150 v unavailable (1) unavailable s-8241acxmc-gcx-t2 4.275 v 4.075 v 2.5 v 2.9 v 0.150 v unavailable (1) unavailable s-8241acymc-gcy-t2 4.275 v 4.075 v 2.6 v 2.9 v 0.100 v unavailable (1) unavailable s-8241aczpn-kcz-tf 4.350 v 4.150 v 2.7 v 2. 7 v 0.200 v unavailable (2) available s-8241adamc-gda-t2 4.350 v 4.150 v 2.3 v 3. 0 v 0.100 v available (1) available s-8241adbpn-kdb-tf 4.280 v 4.080 v 2.3 v 2. 3 v 0.250 v unavailable (2) available *1. the delay time combination (1), (2), (3), (4) is as follows. delay time combination overcharge detection delay time overdischarge detection delay time overcurrent 1 detection delay time (1) 1.0 s 125 ms 8 ms (2) 0.125 s 31 ms 16 ms (3) 0.25 s 125 ms 8 ms (4) 2.0 s 125 ms 8 ms it is possible to change the detection voltage for products ot her than those listed above. also, delay time can be changed within the following range. for det ails, please contact our sales office. delay time symbol optional range remarks overcharge detection delay time t cu 0.25 s 0.5 s 1.0 s choose from the list at left. overdischarge detection delay time t dl 31 ms 62.5 ms 125 ms choose from the list at left. overcurrent 1 detection delay time t lov1 4 ms 8 ms 16 ms choose from the list at left. shaded boxes indicate standard values.
battery protection ic for 1-cell pack rev.4.1 _01 s-8241 series seiko instruments inc. 5 ? pin configurations pin no. symbol pin 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 pin no. symbol pin description 1 vm voltage detection pin between vm and vss (overcurrent detection pin) 2 vdd positive power input pin 3 co fet gate connection pin for charge control (cmos output) 4 do fet gate connection pin for discharge control (cmos output) 5 vss negative power input pin remark pin assignment of sot-23-5 and of 5-pin son(a) are different. 3 2 1 4 5 5-pin son(a) top view figure 3 ? absolute maximum ratings (ta = 25 c unless otherwise specified) item symbol applicable pin rating unit input voltage between vdd and vss *1 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 power dissipation sot-23-5 p d ? 250 mw 5-pin son(b) 150 operation ambient temperature topr ? ? 40 to +85 c storage temperature tstg ? ? 40 to +125 c *1. do not apply pulse-like noise of s order exceeding the above input voltage (v ss + 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.
battery protection ic for 1-cell pack s-8241 series rev.4.1 _01 seiko instruments inc. 6 ? electrical characteristics (1) othe r than detection delay time (25 c) (ta = 25 c unless otherwise specified) item symbol measure- ment conditions remarks min. typ. max. unit measure- ment circuit detection voltage v cu 1 ? v cu -0.025 v cu v cu +0.025 v 1 overcharge detection voltage v cu =3.9 to 4.4 v, 5 mv step ta= -5 c to 55 c *1 v cu -0.030 v cu v cu +0.030 v cl 1 when v cl v cu v cl -0.050 v cl v cl +0.050 v 1 overcharge release voltage v cu ? v cl =0 to 0.4 v, 50mv step when v cl = v cu v cl -0.025 v cl v cl +0.025 overdischarge detection voltage v dl =2.0 to 3.0 v, 100mv step v dl 1 ? v dl -0.080 v dl v dl +0.080 v 1 v du 1 when v du v dl v du -0.100 v du v du +0.100 overdischarge release voltage v du ? v dl =0 to 0.7 v, 100mv step when v du = v dl v du -0.080 v du v du +0.080 v 1 overcurrent 1 detection voltage v iov1 =0.05 to 0.3v, 5mv step v iov1 2 ? v iov1 -0.02 0 v iov1 v iov1 +0.02 0 v 1 overcurrent 2 detection voltage v iov2 2 ? 0.4 0.5 0.6 v 1 load short-circuiting detection voltage v short 2 vm voltage based on v dd -1.7 -1.3 -0.9 v 1 charger detection voltage v cha 3 ? -2.0 -1.3 -0.6 v 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 4 v dd =3.5v, v vm =0 v 1.0 3.0 5.0 a 1 current consumption at power down i pdn 4 v dd =v vm =1.5 v ? ? 0.1 a 1 current consumption power-down function unavailable current consumption during normal operation i ope 4 v dd =3.5 v, v vm =0 v 1.0 3.0 5.0 a 1 overdischarge current consumption i oped 4 v dd =v vm =1.5 v 1.0 2.0 3.5 a 1 output resistance co pin h resistance r coh 6 v co =3.0 v,v dd =3.5 v,v vm =0 v 0.1 2 10 k ? 1 co pin l resistance r col 6 v co =0.5 v,v dd =4.5 v,v vm =0 v 150 600 2400 k ? 1 do pin h resistance r doh 7 v do =3.0 v,v dd =3.5 v,v vm =0 v 0.1 1.3 6.0 k ? 1 do pin l resistance r dol 7 v do =0.5 v,v dd =v vm =1.8 v 0.1 0.5 2.0 k ? 1 vm internal resistance internal resistance between vm and vdd r vmd 5 v dd =1.8 v, v vm =0 v 100 300 900 k ? 1 internal resistance between vm and vss r vms 5 v dd =v vm =3.5 v 50 100 150 k ? 1 0 v battery charging function the 0 v battery function is either "0 v battery chargi ng function" or "0 v battery charge inhibi ting function" depending upon the product type. 0 v battery charge starting charger voltage v 0cha 10 0 v battery charging available 0.0 0.8 1.5 v 1 0 v battery charge inhibiting battery voltage v 0inh 11 0 v battery charging unavailable 0.6 0.9 1.2 v 1 *1. since products are not screened at high and low temperatures, the specification for this temperature range is guaranteed by de sign, not tested in production.
battery protection ic for 1-cell pack rev.4.1 _01 s-8241 series seiko instruments inc. 7 ? electrical characteristics (2) other than detection delay time (-40 to 85 c *1 ) (ta = (-40 to 85 c *1 )unless otherwise specified) item symbol measure- ment conditions remarks min. typ. max. unit measure- ment circuit detection voltage overcharge detection voltage v cu =3.9 to 4.4 v, 5mv step v cu 1 ? v cu -0.055 v cu v cu +0.040 v 1 v cl 1 when v cl v cu v cl -0.095 v cl v cl +0.060 v 1 overcharge release voltage v cu ? v cl =0 to 0.4 v, 50mv step when v cl = v cu v cl -0.055 v cl v cl +0.040 overdischarge detection voltage v dl =2.0 to 3.0 v, 100mv step v dl 1 ? v dl -0.120 v dl v dl +0.120 v 1 v du 1 when v du v dl v du -0.140 v du v du +0.140 v 1 overdischarge release voltage v du ? v dl =0 to 0.7 v, 100mv step when v du = v dl v du -0.120 v du v du +0.120 overcurrent 1 detection voltage v iov1 =0.05 to 0.3v, 5mv step v iov1 2 ? v iov1 -0.02 6 v iov1 v iov1 +0.026 v 1 overcurrent 2 detection voltage v iov2 2 ? 0.37 0.5 0.63 v 1 load short-circuiting detection voltage v short 2 vm voltage based on v dd -1.9 -1.3 -0.7 v 1 charger detection voltage v cha 3 ? -2.2 -1.3 -0.4 v 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 4 v dd =3.5 v, v vm =0 v 0.7 3.0 6.0 a 1 current consumption at power down i pdn 4 v dd =v vm =1.5 v ? ? 0.1 a 1 current consumption power-down function unavailable current consumption during normal operation i ope 4 v dd =3.5 v, v vm =0 v 0.7 3.0 6.0 a 1 overdischarge current consumption i oped 4 v dd =v vm =1.5 v 0.6 2.0 4.5 a 1 output resistance co pin h resistance r coh 6 v co =3.0 v,v dd =3.5 v,v vm =0 v 0.07 2 13 k ? 1 co pin l resistance r col 6 v co =0.5 v,v dd =4.5 v,v vm =0 v 100 600 3500 k ? 1 do pin h resistance r doh 7 v do =3.0 v,v dd =3.5 v,v vm =0 v 0.07 1.3 7.3 k ? 1 do pin l resistance r dol 7 v do =0.5 v,v dd =v vm =1.8 v 0.07 0.5 2.5 k ? 1 vm internal resistance internal resistance between vm and vdd r vmd 5 v dd =1.8 v, v vm =0 v 78 300 1310 k ? 1 internal resistance between vm and vss r vms 5 v dd =v vm =3.5 v 39 100 220 k ? 1 0 v battery charging function the 0 v battery function is either "0 v battery chargi ng function" or "0 v battery charge inhibi ting function" depending upon the product type. 0 v battery charge starting charger voltage v 0cha 10 0 v battery charging available 0.0 0.8 1.7 v 1 0 v battery charge inhibiting battery voltage v 0inh 11 0 v battery charging unavailable 0.4 0.9 1.4 v 1 *1. since products are not screened at high and low temperatures, the specification fo r this temperature range is guaranteed by d esign, not tested in production.
battery protection ic for 1-cell pack s-8241 series rev.4.1 _01 seiko instruments inc. 8 ? electrical characteristics (3) detection delay time (25 c) (ta = 25 c unless otherwise specified) item symbol measurement conditions remarks min. typ. max. unit measurement circuit delay time (1) overcharge detecti on delay time t cu 8 ? 0.7 1.0 1.3 s 1 overdischarge detec tion delay time t dl 8 ? 87.5 125 162.5 ms 1 overcurrent 1 detection delay time t lov1 9 ? 5.6 8 10.4 ms 1 overcurrent 2 detection delay time t lov2 9 ? 1.4 2 2.6 ms 1 load short-circuiti ng detection delay time t short 9 ? ? 10 50 s 1 delay time (2) overcharge detecti on delay time t cu 8 ? 87.5 125 162.5 ms 1 overdischarge detec tion delay time t dl 8 ? 21 31 41 ms 1 overcurrent 1 detection delay time t lov1 9 ? 11 16 21 ms 1 overcurrent 2 detection delay time t lov2 9 ? 1.4 2 2.6 ms 1 load short-circuiti ng detection delay time t short 9 ? ? 10 50 s 1 delay time (3) overcharge detecti on delay time t cu 8 ? 0.175 0.25 0.325 s 1 overdischarge detec tion delay time t dl 8 ? 87.5 125 162.5 ms 1 overcurrent 1 detection delay time t lov1 9 ? 5.6 8 10.4 ms 1 overcurrent 2 detection delay time t lov2 9 ? 1.4 2 2.6 ms 1 delay time (4) overcharge detecti on delay time t cu 8 ? 1.4 2.0 2.6 s 1 overdischarge detec tion delay time t dl 8 ? 87.5 125 162.5 ms 1 overcurrent 1 detection delay time t lov1 9 ? 5.6 8 10.4 ms 1 overcurrent 2 detection delay time t lov2 9 ? 1.4 2 2.6 ms 1 load short-circuiti ng detection delay time t short 9 ? ? 10 50 s 1
battery protection ic for 1-cell pack rev.4.1 _01 s-8241 series seiko instruments inc. 9 ? electrical characteristics (4) detection delay time (-40 to 85 c *1 ) (ta = -40 to 85 c *1 unless otherwise specified) item symbol measurement conditions remarks min. typ. max. unit measurement circuit delay time (1) overcharge detecti on delay time t cu 8 ? 0.55 1.0 1.7 s 1 overdischarge detec tion delay time t dl 8 ? 69 125 212 ms 1 overcurrent 1 detection delay time t iov1 9 ? 4.4 8 14 ms 1 overcurrent 2 detection delay time t iov2 9 ? 1.1 2 3.4 ms 1 load short-circuiti ng detection delay time t short 9 ? ? 10 73 s 1 delay time (2) overcharge detecti on delay time t cu 8 ? 69 125 212 ms 1 overdischarge detec tion delay time t dl 8 ? 17 31 53 ms 1 overcurrent 1 detection delay time t iov1 9 ? 9 16 27 ms 1 overcurrent 2 detection delay time t iov2 9 ? 1.1 2 3.4 ms 1 load short-circuiti ng detection delay time t short 9 ? ? 10 73 s 1 delay time (3) overcharge detecti on delay time t cu 8 ? 0.138 0.25 0.425 s 1 overdischarge detec tion delay time t dl 8 ? 69 125 212 ms 1 overcurrent 1 detection delay time t iov1 9 ? 4.4 8 14 ms 1 overcurrent 2 detection delay time t iov2 9 ? 1.1 2 3.4 ms 1 load short-circuiti ng detection delay time t short 9 ? ? 10 73 s 1 delay time (4) overcharge detecti on delay time t cu 8 ? 1.1 2.0 3.4 s 1 overdischarge detec tion delay time t dl 8 ? 69 125 212 ms 1 overcurrent 1 detection delay time t iov1 9 ? 4.4 8 14 ms 1 overcurrent 2 detection delay time t iov2 9 ? 1.1 2 3.4 ms 1 load short-circuiti ng detection delay time t short 9 ? ? 10 73 s 1 *1. since products are not screened at high and low temperatures, the specification for this temperature range is guaranteed by de sign, not tested in production.
battery protection ic for 1-cell pack s-8241 series rev.4.1 _01 seiko instruments inc. 10 ? measurement circuits unless otherwise specified, the output voltage levels "h" and "l" at co and do pins are judged by the threshold voltage (1.0 v) of a nch fet. judge the co pin level with respect to v vm and the do pin level with respect to v ss . voltages v1 to v4 are shown in the figure 4. (1) measurement condition 1, measurement circuit 1 ?? overcharge detection voltage, overcharge rel ease 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 increas ed 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 voltage v1 is then gradually increased. (2) measurement condition 2, measurement circuit 1 ?? overcurrent 1 detection voltage, ov ercurrent 2 detection 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 increas ed 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) measurement condition 3, measurement circuit 1 ?? charger detection voltage, (=abnormal charge current detection voltage) ?? ? applied only for products wi th overdischarge hysteresis set v1=1.8 v and v2=0 v under overdischarge c ondition. increase v1 gradually, set v1=(v du +v dl )/2 (within overdischarge hysteresis, overdischarge condition), then decreas e 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 wi thout 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. the abnormal charge current detection voltage has t he same value as the charger detection voltage (v cha ).
battery protection ic for 1-cell pack rev.4.1 _01 s-8241 series seiko instruments inc. 11 (4) measurement condition 4, measurement circuit 1 ?? normal operation current consumption, power-dow n 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 overdischarge 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 overdischarge condition. the current i dd flowing through vdd pin is the overdischarge current consumption (i oped ). (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 overdisc harge 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 overcurrent 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) 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 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) 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 i do flowing through do pin. 0.5v/|i do | gives the do pin h resistance (r doh ). set v1=1.8 v, v2=0 v and v4=0.5 v under ov erdischarge condition. measure current i do flowing through do pin. 0.5 v/|i do | gives the do pin l resistance (r dol ). (8) measurement condition 8, measurement circuit 1 ?? overcharge detection delay time, ov erdischarge detection delay time ?? set v1=3.5 v and v2=0 v under normal condition. in crease v1 gradually to overcharge detection voltage v cu - 0.2 v and increase v1 to the overcharge 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. decrease v1 gradually to overdischarge 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 ).
battery protection ic for 1-cell pack s-8241 series rev.4.1 _01 seiko instruments inc. 12 (9) measurement condition 9, measurement circuit 1 ?? overcurrent 1 detection delay time, overcurrent 2 detection delay time, load short-circuiting detection delay time, abnormal charge current detection delay time ?? set v1=3.5v and v2=0v under normal condition. increas e 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. incr ease 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 ). note: the overcurrent 2 detection delay time starts when t he overcurrent 1 is detected, since the delay circuit is common. set v1=3.5 v and v2=0 v under normal condition. incr ease v2 from 0 v to 3.0 v momentarily (within 1 s). the time after v2 becomes the load short-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. decreas e 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 char ge current detection delay time has the same value as the overcharge detection delay time. (10) measurement condition 10, measurement circui t 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 v co goes h (v vm + 0.1 v or higher) is the 0 v battery charge start charger voltage (v 0cha ). (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 gradua lly. the voltage between vdd and vss at which v co goes h (v vm + 0.1 v or higher) is the 0v battery charge inhibiting battery voltage (v 0inh ). vss do co vdd s-8241 series v1 i dd vm v2 measurement circuit 1 i vm a v a v do com a i do v v co a i co v4 v3 figure 4
battery protection ic for 1-cell pack rev.4.1 _01 s-8241 series seiko instruments inc. 13 ? operation remark refer to the ? ? battery protection ic connection example ?. normal condition the s-8241 monitors the voltage of the battery c onnected to vdd and vss pins and the voltage difference between vm and vss pins to control charging and dischar ging. 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 discharging control fets on. this c ondition 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 hi gher 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 overcu rrent 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 r vms resistor under the overcurrent condition. when a load is connected, the vm pin voltage equals the v dd 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 fo r a connection example) becomes higher than the automatic recoverable impedance (see the equation [1] bel ow). 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 overcurrent 1 detection voltage (v iov1 ), the ic returns to the normal condition. automatic recoverable impedance = {battery voltage / (m inimum value of overcurrent 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 t he battery voltage and overcu rrent 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 c hecking the overcurrent 1 det ection voltage setting for the ic.
battery protection ic for 1-cell pack s-8241 series rev.4.1 _01 seiko instruments inc. 14 overcharge condition when the battery voltage becomes higher than the overcharge detection voltage (v cu ) during charging under normal condition and the state continues fo r the overcharge detection delay time (t cu ) or longer, the s-8241 turns the charging control fet off to stop charging. this condition is called the overcharge condition. the overcharge condition is released in the following two cases ( c and d ) depending on the products with and without overcharge hysteresis: ? products with overcharge hyster esis (overcharge detection voltage (v cu ) > overcharge release voltage (v cl )) c when the battery voltage drops bel ow the overcharge release voltage (v cl ), the s-8241 turns the charging control fet on and returns to the normal condition. d when a load is connected and discharging starts , the s-8241 turns the charging control fet on and returns to the normal condition. the release mec hanism is as follows: the discharging current flows through an internal parasitic diode of the chargi ng 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 vo ltage (being higher than the overcurrent 1 detection voltage) and releases the overcharge condition. cons equently, in the case that the battery voltage is equal to or lower than the overcharge detection voltage (v cu ), the ic returns to the normal condition immediately, but in the case the battery volt age is higher than the overcharge detection voltage (v cu ), the ic does not return to the normal condition unt il 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 connected and discharging starts, the ic does not return to the normal condition. 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 drops below the ov ercharge detection voltage (v cu ) even when a heavy load, which causes an overcurrent, is connected, the over current 1 and overcurrent 2 do not wo rk until the battery voltage drops below the overchar ge detection voltage (v cu ). since an actual battery has, however, an internal impedance of several dozens of m ? , and the battery voltage drops immediat ely after a heavy load which causes an overcurrent is connected, t he overcurrent 1 and overcurrent 2 work. detection of load short-circuiting works regardless of the battery voltage. ? products without overcharge hyst eresis (overcharge detection voltage (v cu ) = overcharge release voltage (v cl )) c when the battery voltage drops bel ow the overcharge release voltage (v cl ), the s-8241 turn the charging control fet on and returns to the normal condition. d when a load is connected and discharging starts, the s-8241 turns the charging control fet on and returns to the normal condition. the release me chanism 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 vo ltage 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 increas es the overcharge detection voltage about 50 mv, and releases the overcharge condition. consequently, w hen the battery voltage is equal to or lower than the overcharge detection voltage (v cu ) + 50 mv, the s-8241 immediately returns to the norma l condition. but the battery voltage is higher than the overcharge detection voltage (v cu ) + 50 mv, the s-8241 does not return to the normal condition until the battery voltage drops below the overcharge detection voltage (v cu ) + 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 hi gher than the overchar ge detection voltage (v cu ) and the battery voltage does not drop below the ov ercharge detection voltage (v cu ) + 50 mv even when a heavy load, which causes an overcurrent, is connected, the overcu rrent 1 and overcurrent 2 do not work until the battery voltage drops bellow the 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 immediat ely after a heavy load which causes an overcurrent is connected, t he overcurrent 1 and overcurrent 2 work. detection of load short-circuiting works regardless of the battery voltage.
battery protection ic for 1-cell pack rev.4.1 _01 s-8241 series seiko instruments inc. 15 overdischarge condition (for products with power-down function) when the battery voltage drops below the overdischarge detection voltage (v dl ) during discharging under normal condition and it continues for t he overdischarge detection delay time (t dl ) or longer, the s-8241 turns the discharging control fet off and stops disc harging. this condition is called overdischarge condition. 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. meanwhile the potent ial 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 (i pdn ). this condition is called power-down condition. the vm and vdd pins are shorted by the r vmd resistor in the ic under the ov erdischarge and power-down conditions. the power-down condition is released when a charger is connected and the potential difference between vm and vdd becomes 1.3 v (typ.) or higher (load short- circuiting detection voltage). at this time, the fet is still off. when the battery voltage becomes t he overdischarge detection voltage (v dl ) or higher (see note), the s-8241 turns the fet on and changes to the normal condition from the overdischarge condition. remark if the vm pin voltage is no less t han the charger detection voltage (v cha ), when the battery under overdischarge condition is connected to a charger, t he overdischarge condition is released (the discharging control fet is turned on) as usual, provided that the battery voltage reaches the overdischarge release voltage (v du ) or higher. overdischarge condition (for products without power-down function) when the battery voltage drops below the overdischarge detection voltage (v dl ) during discharging under normal condition and it continues for t he overdischarge detection delay time (t dl ) or longer, the s-8241 turns the discharging control fet off and stops dischar ging. 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 (t yp.) (the load short-circuiting detection voltage), current consumption of the ic is reduced to the overdischarge current consumption (i oped ). 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 ov erdischarge condition is released in the same way as explained above in respect to products having the power-down function. for products wi thout 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 overdischar ge condition provided that the load is disconnected 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 rvms resistor between vm and vss in the ic when the battery voltage reaches the overdischarge release voltage (v du ) or higher. charger detection if the vm pin voltage is lower than the charger detection voltage (v cha ) when a battery in overdischarge condition is connected to a charger , overdischarge hysteresis is re leased, and when the battery voltage becomes equal to or higher than the overdischarge detection voltage (v dl ), the overdischarge condition is released (the discharging control fet is turned on). th is action is called charger detection. (the charger detection reduces the time for charging in which char ging 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 condition is connected to a charger, the overdischarge condition is releas ed (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 s-8241 series rev.4.1 _01 seiko instruments inc. 16 abnormal charge current detection if the vm pin voltage drops below the charger detection voltage (v cha ) during charging under the normal condition and it continues for the overcharge detection delay time (t cu ) 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 disc harging control fet is on (do pin voltage is ?h?) and the vm pin voltage drops below the charger detection voltage (v cha ). when an abnormal charge current flows into a battery in the overdischar ge 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 (t cu ) elapses. abnormal charge current detection is released w hen the 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 priority 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. delay circuits the following detection delay times are generated by di viding the approximate 2 khz clock with a counter. [example] overcharge detection delay time (= abnor mal charge current detection delay time): 1.0s overdischarge detection delay time: 125 ms overcurrent 1 detection delay time: 8 ms overcurrent 2 detection delay time: 2 ms caution 1. after having detected an overcurrent (overcurrent 1, overcurrent 2, short-circuiting), the state is held for the overdischarge detection delay time or longer without releasing the load, the condition changes to the power-down condition when the battery voltage drops below the overdischarge detection voltage. if the battery voltage drops below the overdischarge detection voltage due to overcurrent, the discharging control fet is turned off when the overcurrent is detected. if the battery voltage recovers slowly and if the battery voltage after the overdischarge detection delay time is equal to or lower than the overdischarge detection voltage, the s-8241 changes to the power-down condition. do pin v m p in v dd v dd time time v iov1 v ss v ss v iov2 overcurrent 2 detection dela y time ( t iov2 ) figure 5 2. counting for the overcurrent 2 detection delay time starts when the overcurrent 1 is detected. having detected the overcurrent 1, if the overcurrent 2 is detected after the overcurrent 2 detection delay time, the s-8241 turns the discharging control fet off as shown in the figure 5. in this case, the overcurrent 2 detection delay time may seem to be longer or overcurrent 1 detection delay time may seem to be shorter than expected.
battery protection ic for 1-cell pack rev.4.1 _01 s-8241 series seiko instruments inc. 17 0v battery charging function (1) (2) (3) this function enables the charging of a connected battery whose voltage is 0 v by self-discharge. when a charger having 0 v battery st art charging charger voltage (v 0cha ) or higher is connected between eb+ and eb- pins, the charging control fet gate is fixed to v dd 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 c harging. at this time, the discharging control fet is off and the charging current flows through the internal par asitic diode in the discharging control fet. if the battery voltage becomes equal to or higher than the overdischarge release voltage (v du ), the normal condition returns. 0v battery charge inhibiting function (1) (3) this function forbids the charging of a connected battery which is short-circuited in ternally (0v battery). when the battery voltage becomes 0.9 v (typ.) or lowe r, the charging control fet 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. (1) some battery providers do not recommend charging of comp letely discharged batteries. please refer to battery providers before the selection of 0 v battery charging function. (2) the 0v battery charging function has higher priori ty than the abnormal charge cu rrent 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 volt age 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 v ss voltage (short the vm and vss pins or connect a charger) to enter the normal condition.
battery protection ic for 1-cell pack s-8241 series rev.4.1 _01 seiko instruments inc. 18 ? timing chart 1-1. 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 mode (2) (1) (1) note: (1) normal mode, (2) overcharge mode, (3) overdischarge mode, (4) overcurrent mode 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 6 1-2. overcharge and overdischarge detection (f or 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 io v 1 v ss v cha co pin vm pin charger connected overcharge detection delay time (t cu ) load connected mode (2) ( 1 ) n ote: (1) n orm al m ode, (2) o vercharge m ode, (3) o verdischarge m ode, (4) o vercurrent m ode t he charger is assum ed to charge with a constant current. ( 1 ) (3) ( 1 ) (3) ( 1 ) overdischarge detection delay time (t dl ) overdischarge detection delay time (t dl ) figure 7
battery protection ic for 1-cell pack rev.4.1 _01 s-8241 series seiko instruments inc. 19 2. overcurrent detection figure 8 3. 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 9 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 mode note: (1) normal mode, (2) overcharge mode, (3) overdischarge mode, (4) overcurrent mode the charger is assumed to charge with constant current. overcurrent 1 detection delay time (t iov1 )
battery protection ic for 1-cell pack s-8241 series rev.4.1 _01 seiko instruments inc. 20 4. 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 10
battery protection ic for 1-cell pack rev.4.1 _01 s-8241 series seiko instruments inc. 21 ? battery protection ic connection example eb+ eb ? s-8241 series 470 ? vss battery do vdd r2 c1 co vm fet1 fet2 r1 0.1 f 1 k ? figure 11 table 1 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 0.0 1 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 constant s may be changed without notice. 2. it has not been confirmed whether the operation is nor mal or not in circuits other than the above example of connection. in addition, the exam ple of connection shown above and the constant do not guarantee proper operation. perform th rough evaluation using the actual application to set the constant.
battery protection ic for 1-cell pack s-8241 series rev.4.1 _01 seiko instruments inc. 22 ? precautions ? pay attention to the operating conditions for input/ output voltage and load current so that the power loss in the ic does not exceed the power dissipation of the package. ? do not apply an electrostatic disc harge to this ic that exceeds the performance ratings of the built-in electrostatic protection circuit. ? sii claims no responsibility for any and all disputes ar ising 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 rev.4.1 _01 s-8241 series seiko instruments inc. 23 ? typical characteristics 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) overcharge detection voltage vs. temperature 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 te mperature characteristics 0 1 2 3 4 5 6 -25 0 25 50 75 ta(c) i ope ( current consumption vs. temperature 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 s-8241 series rev.4.1 _01 seiko instruments inc. 24 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 ti me 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 (
battery protection ic for 1-cell pack rev.4.1 _01 s-8241 series seiko instruments inc. 25 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 =3.5v,v ss =v m =0v 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 =4.5v,v ss =v m =0v 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 =3.5v,v ss =v m =0v 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 =1.8v,v ss =v m =0v

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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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