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rev.2.0 _00 battery protection ic for single-cell pack s-8201 series seiko instruments inc. 1 the s-8201 series are lithium-ion/lithium polyme r rechargeable battery protection ics incorporating high- accuracy voltage detection circuit and delay circuit. the s-8201 series are suitable for protection of single - cell lithium ion/lithium polymer battery packs from overcharge, overdischarge and overcurrent. ? features (1) internal high accuracy voltage detection circuit ? overcharge detection voltage 3.9 v to 4.4 v (5 mv step), accuracy 25 mv (+25 c), 30 mv ( ? 5 c to + 55 c) ? overcharge release voltage 3.8 v to 4.4 v *1 , accuracy 50mv ? overdischarge detection voltage 2.0 v to 3.0 v (10 mv step), accuracy 50 mv ? overdischarge release voltage 2.0 v to 3.4 v *2 , accuracy 100 mv ? overcurrent 1 detection voltage 0.05 v to 0.3 v (10 mv step) accuracy 15 mv ? overcurrent 2 detection voltage 0.5 v (fixed) accuracy 100 mv (2) high voltage device is used for charger connection pins. (vm pin and co pin: absolute maximum rating = 28 v) (3) delay times (overcharge: t cu , overdischarge: t dl , overcurrent 1: t lov1 , overcurrent 2: t lov2 ) are generated by an internal circuit. (no external capacitor is necessary.) accuracy 20% (4) the overcharge timer reset delay time (7 ms to 40 ms) is generated by an internal circuit only. (no external capacitor is necessary.) (5) three-step overcurrent detection circuit is included. (overcurrent 1, overcurrent 2, load short-circuiting) (6) either charge function or charge inhibition function for 0 v battery can be selected. (7) charger detection function and abnormal charge current detection function ? the overdischarge hysteresis is released by detecting negative voltage at the vm pin ( ? 0.7 v typ.). (charger detection function) ? when the output voltage of the do pin is high and the voltage at the vm pin is equal to or lower than the charger detection voltage ( ? 0.7 v typ.), the output voltage of the co pin goes low. (abnormal charge current detection function) (8) low current consumption ? operation 3.5 a typ., 7.0 a max. ? power-down 0.1 a max. (9) wide operating temperature range ? 40 c to + 85 c (10) small package 6-pin sot-23-6, 6-pin snb(b) *1. the overcharge hysteresis voltage is 0.0 v or can be selected from the range 0.1 v to 0.4 v in 50 mv step. overcharge hysterests voltage (v hc ) = overcharge detection voltage ? overcharge release voltage *2. the overdischarge hysteresis voltage is 0.0 v or can be selected from the range 0.1 v to 0.7 v in 100 mv step. overdischarge hysteresis voltage (v hd ) = overdischarge release voltage ? overdischarge detection voltage ? applications ? lithium-ion rechargeable battery packs ? lithium polymer rechargeable battery packs
battery protection ic for single pack s-8201 series rev.2.0 _00 2 seiko instruments inc. ? packages package name drawing code package tape reel sot-23-6 mp006-a mp006-a mp006-a 6-pin snb(b) bd006-a bd006-a bd006-a
battery protection ic for single-cell pack rev.2.0_00 s-8201 series seiko instruments inc. 3 ? block diagram vdd vss do co vm + ? + ? + ? + ? + ? oscillator control circuit 0 v battery charge/charge inhibition circuit divider control logic overcharge detection comparator overdischarge detection omparator load short-circuiting detection comparator overcurrent 2 detection comparator overcurrent 1 detection comparator charger detection circuit r vmd r vms dp output control circuit remark the diodes in the figure are all parasitic diodes. figure 1
battery protection ic for single pack s-8201 series rev.2.0 _00 4 seiko instruments inc. ? product name structure 1. product name s - 8201 x xx xx xxx - xx ic direction in tape specifications *1 t2: sot-23-6 tf: 6-pin snb(b) product code *2 package code md: sot-23-6 bd: 6-pin snb(b) serial code product type a: a type b: b type *1. refer to the taping specifications at the end of this book. *2 . refer to the ? table 1 to 2 ? in the ? 2. product name list ?.
battery protection ic for single-cell pack rev.2.0_00 s-8201 series seiko instruments inc. 5 2. product name list 2-1. a type table 1 (1/2) model no./item overdischarge detection voltage overcharge release voltage overdischarge detection voltage overdischarge release voltage overcurrent 1 detection voltage 0 v battery charge function s-8201aaabd-m5a-tf 4.3 v 4.1 v 2.3 v 2.3 v 0.13 v available s-8201aabbd-m5b-tf 4.305 v 4.005 v 2.3 v 2.9 v 0.1 v available S-8201AACBD-M5C-TF 4.295 v 3.995 v 2.3 v 2.9 v 0.1 v available s-8201aadbd-m5d-tf 4.325 v 4.075 v 2.5 v 2.9 v 0.15 v unavailable s-8201aaebd-m5e-tf 4.350 v 4.150 v 2.3 v 3.0 v 0.20 v unavailable s-8201aafbd-m5f-tf 4.350 v 4.150 v 2.3 v 3.0 v 0.20 v available table 1 (2/2) model no./item overcharge detection delay time overdischarge detection delay time overcurrent 1 detection delay time s-8201aaabd-m5a-tf 4.6 s 150 ms 9 ms s-8201aabbd-m5b-tf 4.6 s 150 ms 9 ms S-8201AACBD-M5C-TF 4.6 s 150 ms 9 ms s-8201aadbd-m5d-tf 1.2 s 150 ms 9 ms s-8201aaebd-m5e-tf 1.2 s 150 ms 9 ms s-8201aafbd-m5f-tf 1.2 s 150 ms 9 ms remark it is possible to change the detection voltages of the product other than above. the delay times can also be changed within the range-listed bellow. for details, contact sii marketing department. table 2 delay time symbol selection range remarks overcharge detection delay time t cu 0.15 s 1.2 s 4.6 s choose from the left overdischarge detection delay time t dl 37.5 ms 150 ms 300 ms choose from the left overcurrent 1 detection delay time t iov1 4.5 ms 9m s 18 ms choose from the left remark values surrounded by bold lines are used in standard products.
battery protection ic for single pack s-8201 series rev.2.0 _00 6 seiko instruments inc. 2-2. b type table 3 (1/2) model no./item overdischarge detection voltage overcharge release voltage overdischarge detection voltage overdischarge release voltage overcurrent 1 detection voltage 0 v battery charge function s-8201baabd-m7a-tf 4.3 v 4.1 v 2.3 v 2.3 v 0.13 v available table 3 (2/2) model no./item overcharge detection delay time overdischarge detection delay time overdischarge release delay time overcurrent 1 detection delay time s-8201baabd-m7a-tf 4.6 s 150 ms 1.18 ms 9 ms remark it is possible to change the detection voltages of the product other than above. the delay times can also be changed within the range-listed bellow. for details, contact sii marketing department. table 4 delay time symbol selection range remarks overcharge detection delay time t cu 0.15 s 1.2 s 4.6 s choose from the left overdischarge detection delay time t dl 37.5 ms 150 ms 300 ms choose from the left overcurrent 1 detection delay time t iov1 4.5 ms 9m s 18 ms choose from the left remark values surrounded by bold lines are used in standard products.
battery protection ic for single-cell pack rev.2.0_00 s-8201 series seiko instruments inc. 7 ? pin configurations table 5 pin no. pin name pin description 1 do fet gate control pin for discharge (cmos output) 2 vm voltage detection pin between vm pin and vss pin (overcurrent detection pin) 3 co fet gate control pin for charge (cmos output) 4 dp test pin for delay time acceleration 5 vdd positive power input pin sot-23-6 top view 6 4 5 1 2 3 6 vss negative power input pin figure 2 table 6 pin no. pin name pin description 1 co fet gate control pin for charge (cmos output) 2 vm voltage detection pin between vm pin and vss pin (overcurrent detection pin) 3 do fet gate control pin for discharge (cmos output) 4 vss negative power input pin 6-pin snb(b) top view 6 4 5 3 1 2 5 dp test pin for delay time acceleration 6 vdd positive power input pin figure 3 ? absolute maximum ratings table 7 (ta = 25 c unless otherwise specified) item symbol applied pin absolute maximum ratings unit input voltage v ds between vdd and vss v ss ? 0.3 to v ss + 12 *1 v v dp dp v ss ? 0.3 to v dd + 0.3 v vm vm v dd ? 28 to v dd + 0.3 output voltage v co co v vm ? 0.3 to v dd + 0.3 v do do v ss ? 0.3 to v dd + 0.3 power dissipation sot-23-6 p d ? 250 mw 6-pin snb(b) 90 operating ambient temperature topr ? ? 40 to + 85 c storage temperature tstg ? ? 55 to + 125 *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 single pack s-8201 series rev.2.0 _00 8 seiko instruments inc. ? electrical characteristics 1. except detection delay time (ta = = = = 25c) table 8 (ta = 25 c unless otherwise specified) item symbol condition remark min. typ. max. unit test circuit [detection voltage, release 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 ? 0.03 v cu v cu + 0.03 overcharge release voltage, v cl = 3.8 to 4.4 v v cl 1 ? v cl ? 0.05 v cl v cl + 0.05 overdischarge detection voltage, v dl = 2.0 to 3.0 v, 10 mv step v dl 2 ? v dl ? 0.05 v dl v dl + 0.05 2 overdischarge release voltage, v du = 2.0 to 3.4 v, v du 2 ? v du ? 0.1 v du v du + 0.1 overcurrent detection voltage 1, v iov1 = 0.05 to 0.3 v, 10 mv step v iov1 3 ? v iov1 ? 0.015 v iov1 v iov1 + 0.015 overcurrent detection voltage 2 v iov2 3 ? 0.4 0.5 0.6 load short-circuiting detection voltage v short 3 ? 0.9 1.2 1.5 charger detection voltage v cha 4 ? ? 1.0 ? 0.7 ? 0.4 [operation voltage] operation voltage between vdd pin and vss pin v dsop1 ? internal circuit operating voltage 1.5 ? 8 v ? operation voltage between vdd pin and vm pin v dsop2 ? internal circuit operating voltage 1.5 ? 28 [current consumption] current consumption in normal operation i ope 5 v dd = 3.5 v, v vm = 0 v 1.0 3.5 7.0 a 2 current consumption at power down i pdn 5 v dd = v vm = 1.5 v ? ? 0.1 [output resistance] co pin high resistance r coh 7 v co = 3.0 v, v dd = 3.5 v, v vm = 0 v 2.5 5 10 k ? 4 co pin low resistance r col 7 v co = 0.5 v, v dd = 4.5 v, v vm = 0 v 2.5 5 10 do pin high resistance r doh 8 v do = 3.0 v, v dd = 3.5 v, v vm = 0 v 2.5 5 10 do pin low resistance r dol 8 v do = 0.5 v, v dd = v vm = 1.8 v 2.5 5 10 [vm internal resistance] internal resistance between vm pin and vdd pin r vmd 6 v dd = 1.8 v, v vm = 0 v 100 300 900 k ? 3 internal resistance between vm pin and vss pin r vms 6 v dd = 3.5 v, v vm = 1.0 v 10 20 40 [0 v battery charging function] 0 v battery charge starting charger voltage v 0cha 11 0 v battery charging available 1.2 ? ? v 2 0 v battery charge inhibition battery voltage v 0inh 12 0 v battery charging unavailable ? ? 0.5 *1 since products are not screened at low and high temperature, the specification for this temperature range is guaranteed by design, not tested in production.
battery protection ic for single-cell pack rev.2.0_00 s-8201 series seiko instruments inc. 9 2. except detection delay time (ta = = = = ? ? ? ? 40 to 85 c *1 ) table 9 (ta = ? 40 to 85 c unless otherwise specified) item symbol condition remark min. typ. max. unit test circuit [detection voltage, release voltage] overcharge detection voltage, v cu = 3.9 to 4.4 v, 5 mv step v cu 1 ? v cu ? 0.055 v cu v cu + 0.040 v 1 overcharge release voltage, v cl = 3.8 to 4.4 v v cl 1 ? v cl ? 0.08 v cl v cl + 0.065 overdischarge detection voltage, v dl = 2.0 to 3.0 v, 10 mv step v dl 2 ? v dl ? 0.08 v dl v dl + 0.08 2 overdischarge release voltage, v du = 2.0 to 3.4 v v du 2 ? v du ? 0.13 v du v du + 0.13 overcurrent 1 detection voltage, v iov1 = 0.05 to 0.3 v, 10 mv step v iov1 3 ? v iov1 ? 0.021 v iov1 v iov1 + 0.021 overcurrent 2 detection voltage v iov2 3 ? 0.37 0.5 0.63 load short-circuiting detection voltage v short 3 ? 0.7 1.2 1.7 charger detection voltage v cha 4 ? ? 1.2 ? 0.7 ? 0.2 [operation voltage] operation voltage between vdd pin and vss pin v dsop1 ? internal circuit operating voltage 1.5 ? 8 v ? operation voltage between vdd pin and vm pin v dsop2 ? internal circuit operating voltage 1.5 ? 28 [current consumption] current consumption in normal operation i ope 5 v dd = 3.5 v, v vm = 0 v 0.7 3.5 8.0 a 2 current consumption at power down i pdn 5 v dd = v vm = 1.5 v ? ? 0.1 [output resistance] co pin high resistance r coh 7 v co = 3.0 v, v dd = 3.5 v, v vm = 0 v 1.2 5 15 k ? 4 co pin low resistance r col 7 v co = 0.5 v, v dd = 4.5 v, v vm = 0 v 1.2 5 15 do pin high resistance r doh 8 v do = 3.0 v, v dd = 3.5 v, v vm = 0 v 1.2 5 15 do pin low resistance r dol 8 v do = 0.5 v, v dd = v vm = 1.8 v 1.2 5 15 [vm internal resistance] internal resistance between vm pin and vdd pin r vmd 6 v dd = 1.8 v, v vm = 0 v 78 300 1310 k ? 3 internal resistance between vm pin and vss pin r vms 6 v dd = 3.5v, v vm = 1.0 v 7.2 20 44 [0 v battery charging function] 0 v battery charge starting charger voltage v 0cha 11 0 v battery charging available 1.7 ? ? v 2 0 v battery charge inhibition battery voltage v 0inh 12 0 v battery charging unavailable ? ? 0.3 *1. since products are not screened at low and high temperature, the specification for this temperature range is guaranteed by design, not tested in production.
battery protection ic for single pack s-8201 series rev.2.0 _00 10 seiko instruments inc. 3. detection delay time 3-1. s-8201aaa, s-8201aab, s-8201aac table 10 item symbol condition remark min. typ. max. unit test circuit [delay time] 25 c overcharge detection delay time t cu 9 ? 3.7 4.6 5.5 s 5 overdischarge detection delay time t dl 9 ? 120 150 180 ms overcurrent 1 detection delay time t iov1 10 ? 7.2 9 11 overcurrent 2 detection delay time t iov2 10 ? 3.6 4.5 5.4 load short-circuiting detection delay time t short 10 ? 450 600 720 s overcharge timer reset delay time ttr 13 ? 10 18 28 ms [delay time] ? ? ? ? 40 to 85 c *1 overcharge detection delay time t cu 9 ? 2.5 4.6 7.8 s 5 overdischarge detection delay time t dl 9 ? 83 150 255 ms overcurrent 1 detection delay time t iov1 10 ? 5 9 15 overcurrent 2 detection delay time t iov2 10 ? 2.5 4.5 7.7 load short-circuiting detection delay time t short 10 ? 310 600 1020 s overcharge timer reset delay time ttr 13 ? 7 18 40 ms *1. since products are not screened at low and high temperature, the specification for this temperature range is guaranteed by design. 3-2. s-8201aad, s-8201aae, s-8201aaf table 11 item symbol condition remark min. typ. max. unit test circuit [delay time] 25 c overcharge detection delay time t cu 9 ? 0.96 1.2 1.4 s 5 overdischarge detection delay time t dl 9 ? 120 150 180 ms overcurrent 1 detection delay time t iov1 10 ? 7.2 9 11 overcurrent 2 detection delay time t iov2 10 ? 1.8 2.24 2.7 load short-circuiting detection delay time t short 10 ? 220 320 380 s overcharge timer reset delay time ttr 13 ? 10 18 28 ms [delay time] ? ? ? ? 40 to 85 c *1 overcharge detection delay time t cu 9 ? 0.7 1.2 2.0 s 5 overdischarge detection delay time t dl 9 ? 83 150 255 ms overcurrent 1 detection delay time t iov1 10 ? 5 9 15 overcurrent 2 detection delay time t iov2 10 ? 1.2 2.24 3.8 load short-circuiting detection delay time t short 10 ? 150 320 540 s overcharge timer reset delay time ttr 13 ? 7 18 40 ms *1. since products are not screened at low and high temperature, the specification for this temperature range is guaranteed by design.
battery protection ic for single-cell pack rev.2.0_00 s-8201 series seiko instruments inc. 11 3-3. s-8201baa table 12 item symbol condition remark min. typ. max. unit test circuit [delay time] 25 c overcharge detection delay time t cu 9 ? 3.7 4.6 5.5 s 5 overdischarge detection delay time t dl 9 ? 120 150 180 ms overdischarge release delay time t du 9 ? 0.94 1.18 1.42 overcurrent 1 detection delay time t iov1 10 ? 7.2 9 11 overcurrent 2 detection delay time t iov2 10 ? 3.6 4.5 5.4 load short-circuiting detection delay time t short 10 ? 450 600 720 s overcharge timer reset delay time ttr 13 ? 10 18 28 ms [delay time] ? ? ? ? 40 to 85 c *1 overcharge detection delay time t cu 9 ? 2.5 4.6 7.8 s 5 overdischarge detection delay time t dl 9 ? 83 150 255 ms overdischarge release delay time t du 9 ? 0.65 1.18 2.01 overcurrent 1 detection delay time t iov1 10 ? 5 9 15 overcurrent 2 detection delay time t iov2 10 ? 2.5 4.5 7.7 load short-circuiting detection delay time t short 10 ? 310 600 1020 s overcharge timer reset delay time ttr 13 ? 7 18 40 ms *1. since products are not screened at low and high temperature, the specification for this temperature range is guaranteed by design.
battery protection ic for single pack s-8201 series rev.2.0 _00 12 seiko instruments inc. ? test circuits caution unless otherwise specified, the output voltage (v co ) levels at co pin and do pin and ?h? and ?l? at the 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 the overcharge detection voltage (v cu ) is defined as the voltage between vdd pin and vss pin at which v co goes from "h" to "l" when the voltage v1 is gradually increased from the starting condition of v1 = 3.5 v. the overcharge release voltage (v cl ) is defined as the voltage between vdd pin and vss pin at which v co goes from "l" to "h" when the voltage v1 is then gradually decreased. the overcharge hysteresis voltage (v hc ) is defined as the difference between the overcharge detection voltage (v cu ) and the overcharge release voltage (v cl ). (2) test condition 2 (test circuit 2): overdischarge detection voltage, overdischarge release voltage the overdischarge detection voltage (v dl ) is defined as the voltage between vdd pin and vss pin at which v do goes from "h" to "l" when the voltage v1 is gradually decreased from the starting condition of v1 = 3.5 v, v2 = 0 v. the overdischarge release voltage (v du ) is defined as the voltage between vdd pin and vss pin at which v do goes from "l" to "h" when the voltage v1 is then gradually increased. the overdischarge hysteresis voltage (v hd ) is defined as the difference between the overcharge release voltage (v du ) and the overdischarge detection voltage (v dl ). (3) test condition 3 (test circuit 2): overcurrent 1 detection voltage, overcurrent 2 detection voltage, load short-circuiting detection voltage the overcurrent 1 detection voltage is defined by the voltage between vm pin and vss pin whose delay time for changing v do from ?h? to ?l? lies between the minimum and the maximum value of the overcurrent 1 detection delay time when the voltage v2 is increased rapidly within 10 s from the starting condition v1 = 3.5 v and v2 = 0 v. the overcurrent 2 detection voltage is defined by the voltage between vm pin and vss pin whose delay time for changing v do from ?h? to ?l? lies between the minimum and the maximum value of the overcurrent 2 detection delay time when the voltage v2 is increased rapidly within 10 s from the starting condition v1 = 3.5 v and v2 = 0 v. the load short-circuiting detection voltage is defined by the voltage between vm pin and vss pin whose delay time for changing v do from ?h? to ?l? lies between the minimum and the maximum value of the load short-circuiting detection delay time when the voltage v2 is increased rapidly within 10 s from the starting condition v1 = 3.5 v and v2 = 0 v. (4) test condition 4 (test circuit 2): charger detection voltage ( = = = = abnormal charge current detection voltage) set v1 = 1.8 v and v2 = 0 v. increase v1 gradually until v1 = v dl + (v hd /2), then decrease v2 from 0 v gradually. the voltage between vm pin and vss pin when v do goes from ?l? to ?h? is the charger detection voltage (v cha ). charger detection voltage can be measured only in the product whose overdischarge hysteresis v hd 0. set v1 = 3.5 v and v2 = 0 v. decrease v2 from 0 v gradually. the voltage between vm pin and vss pin when v co goes from ?h? to ?l? is the abnormal charge current detection voltage. the abnormal charge current detection voltage has the same value as the charger detection voltage (v cha ).
battery protection ic for single-cell pack rev.2.0_00 s-8201 series seiko instruments inc. 13 (5) test condition 5 (test circuit 2): normal operation current consumption, power-down 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 ). 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 ). (6) test condition 6 (test circuit 3): internal resistance between vm pin and vdd pin, internal resistance between vm pin and vss pin set v1 = 1.8 v and v2 = 0 v. the resistance between vm pin and vdd pin is the internal resistance (r vmd ) between vm pin and vdd pin. set v1 = 3.5 v and v2 = 1.0 v. the resistance between vm pin and vss pin is the internal resistance (r vms ) between vm pin and vss pin. (7) test condition 7 (test circuit 4): co pin h resistance, co pin l resistance set v1 = 3.5 v, v2 = 0 v and v3 = 3.0 v. co pin resistance is the co pin h resistance (r coh ). set v1 = 4.5 v, v2 = 0 v and v3 = 0.5 v. co pin resistance is the co pin l resistance (r col ). (8) test condition 8 (test circuit 4): do pin h resistance, do pin l resistance set v1 = 3.5 v, v2 = 0 v and v4 = 3.0 v. do pin resistance is the do pin h resistance (r doh ). set v1 = 1.8 v, v2 = 0 v and v4 = 0.5 v. do pin resistance is the do pin l resistance (r dol ). (9) test condition 9 (test circuit 5): overcharge detection delay time, overdischarge detection delay time, overdischarge release delay time the overcharge detection delay time (t cu ) is the time needed for v co to change from "h" to "l" just after the v1 rapid increase within 10 s from the overcharge detection voltage (v cu ) ? 0.2 v to the overcharge detection voltage (v cu ) + 0.2 v in the condition v2 = 0 v. the overdischarge detection delay time (t dl ) is the time needed for v do to change from "h" to "l" just after the v1 rapid decrease within 10 s from the overdischarge detection voltage (v dl ) + 0.2 v to the overdischarge detection voltage (v dl ) ? 0.2 v in the condition v2 = 0 v. the overdischarge release delay time (t du ) is the time needed for v do to change from "l" to "h" just after the v1 rapid increase within 10 s from the overdischarge release voltage (v du ) ? 0.2 v to the overdischarge release voltage (v du ) + 0.2 v in the condition v2 = 0 v.
battery protection ic for single pack s-8201 series rev.2.0 _00 14 seiko instruments inc. (10) test condition 10 (test circuit 5): 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. increase v2 from 0 v to 0.35 v momentarily (within 10 s ). the time needed for v do to go ?l? is overcurrent detection delay time 1 (t iov1 ). set v1 = 3.5 v and v2 = 0 v. increase v2 from 0 v to 0.7 v momentarily (within 10 s ). the time needed for v do to go ?l? is overcurrent detection delay time 2 (t iov2 ). set v1 = 3.5 v and v2 = 0 v. increase v2 from 0 v to 1.6 v momentarily (within 10 s ). the time needed for v do to go ?l? is the load short-circuiting detection delay time (t short ). set v1 = 3.5 v and v2 = 0 v. decrease v2 from 0 v to ? 1.1 v momentarily (within 10 s ). the time needed for v co to go ?l? is the abnormal charge current detection delay time. the abnormal charge current detection delay time has the same value as the overcharge detection delay time. (11) test condition 11 (test circuit 2): 0 v battery charge starting charger voltage (product with 0 v battery charge function) set v1 = v2 = 0 v and decrease v2 gradually. the voltage between vdd pin and vm pin when v co goes ?h? (v vm + 0.1 v or higher) is the 0 v battery charge starting charger voltage (v 0cha ). (12) test condition 12 (test circuit 2): 0 v battery charge inhibition battery voltage (product with 0 v battery charge inhibition function) set v1 = 0 v and v2 = ? 4 v and increase v1 gradually. the voltage between vdd pin and vss pin when v co goes ?h? (v vm + 0.1 v or higher) is the 0 v battery charge inhibition battery voltage (v 0inh ). (13) test condition 13 (test circuit 5): overcharge timer reset delay time set v2 = 0 v. increase v1 from overcharge detection voltage (v cu ) ?0.2 v to overcharge detection voltage (v cu ) + 0.2 v momentarily (within 10 s), then decrease v1 again to overcharge detection voltage (v cu ) ?0.2 v momentarily (within 10 s) after half the overcharge detection delay time (t cu ) has elapsed. following ttr min., again increase v1 to overcharge detection voltage (v cu ) + 0.2 v momentarily (within 10 s) and check that v co changes from ?h? to ?l? after the overcharge detection delay time from when v1 is first increased momentarily (within 10 s) to overcharge detection voltage (v cu ) + 0.2 v. set v2 = 0v. increase v1 from overcharge detection voltage (v cu ) ?0.2 v to overcharge detection voltage (v cu ) + 0.2 v momentarily (within 10 s), then decrease v1 again to overcharge detection voltage (v cu ) ?0.2 v momentarily (within 10 s) after half the overcharge detection delay time (t cu ) has elapsed. following ttr max., again increase v1 to overcharge detection voltage (v cu ) + 0.2 v momentarily (within 10 s) and check that v co stays ?h? after the overcharge detection delay time from when v1 is first increased momentarily (within 10 s) to overcharge detection voltage (v cu ) + 0.2 v.
battery protection ic for single-cell pack rev.2.0_00 s-8201 series seiko instruments inc. 15 s-8201 series vdd vss do co vm dp v1 com v v do v v co r1 = 470 ? s-8201 series vdd vss do co vm dp v2 v1 com v v do v v co i dd a figure 4 test circuit 1 figure 5 test circuit 2 s-8201 series vdd vss do co vm dp v2 v1 com a i vm a i do s-8201 series vdd vss do co vm dp v2 v1 com a i do v4 v3 a i co figure 6 test circuit 3 figure 7 test circuit 4 s-8201 series vdd vss do co vm dp v2 v1 com ocilloscope ocilloscope figure 8 test circuit 5
battery protection ic for single pack s-8201 series rev.2.0 _00 16 seiko instruments inc. ? operation remark refer to the ? ? example for battery protection ic connection ?. 1. normal condition the s-8201 series monitors the voltage of the battery connected between vdd pin and vss pin and the voltage difference between vm pin and vss pin to control charging and discharging. 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 ic turns both the charging and discharging control fets on. this condition is called the normal condition, and in this condition charging and discharging can be carried out freely. caution when a battery is connected to the ic for the first time, the battery may not enter dischargeable state. in this case, set the vm pin voltage equal to the vss pin voltage or connect a charger to enter the normal condition. 2. overcurrent condition (overcurrent 1 detection, overcurrent 2 detection, and load short- circuiting detection) when the condition in which vm pin voltage is equal to or higher than the overcurrent detection voltage, condition that caused by the excess of discharging current over a specified value, continues longer than the overcharge detection delay time in a battery under the normal condition, the s-8201 series turns the discharging control fet off to stop discharging. this condition is called the overcurrent condition. though the vm pin and vss pin are shorted by the resistor in the ic (r vms ) under the overcurrent condition provided that the vm pin voltage is pulled to the v dd level by the load as long as the load is connected. the vm pin voltage returns to v ss level when the load is released. the overcurrent condition returns to the normal condition when the impedance between the eb + and eb ? pin (refer to figure 14 ) becomes higher than the automatic recoverable impedance and the ic detects that the vm pin potential is lower than the overcurrent 1 detection voltage (v iov1 ). caution the automatic recoverable impedance changes depending on the battery voltage and overcurrent 1 detection voltage settings.
battery protection ic for single-cell pack rev.2.0_00 s-8201 series seiko instruments inc. 17 3. overcharge condition when the battery voltage becomes higher than the overcharge detection voltage (v cu ) during charging under the normal condition and the detection continues for the overcharge detection delay time (t cu ) or longer, the s-8201 series turns the charging control fet off to stop charging. this condition is called the overcharge condition. the overcharge condition is released by the following two cases ((1) and (2)): (1) when the battery voltage falls below the overcharge release voltage, which is equal to the overcharge detection voltage (v cu ) ? overcharge detection hysteresis voltage (v hc ), the s-8201 series turns the charging control fet on and turns to the normal condition. (2) when a load is connected and discharging starts, the s-8201 series turns the charging control fet on and returns to the normal condition. just after the load is connected and discharging starts, the discharging current flows through the parasitic diode in the charging control fet. at this moment the vm pin potential becomes v f voltage, the voltage for the parasitic diode, higher than v ss level. when the battery voltage goes under the overcharge detection voltage (v cu ) and provided that the vm pin voltage is higher than the overcurrent 1 detection voltage, the s-8201 series releases the overcharge condition. caution 1. if the battery is charged to a voltage higher than the overcharge detection voltage (v cu ) and the battery voltage does not fall below the overcharge detection voltage (v cu ) even when a heavy load is connected, the detection of overcurrent 1, overcurrent 2 and load short-circuiting does not work. since an actual battery has the internal impedance of several dozens of m ? ? ? ? , the battery voltage drops immediately after a heavy load which causes overcurrent is connected, and the detection of overcurrent 1, overcurrent 2 and load short-circuiting then works. 2. when a charger is connected after the overcharge detection, the overcharge condition is not released even if the battery voltage is below the overcharge release voltage v cl ( = = = = v cu ? ? ? ? v hc ). the overcharge condition is released when the vm pin voltage goes over the charger detection voltage (v cha ) by removing the charger. 3. if the overcharge release pulse for less than the overcharge timer reset delay time (ttr) is input during the overcharge detection delay time (t cu ) that after exceeding the overcharge detection voltage (v cu ), the t cu keeps the count. however, if the overcharge release pulse is input for ttr or longer under the same conditions, the t cu count is reset. 4. overdischarge condition when the battery voltage falls below the overdischarge detection voltage (v dl ) during discharging under the normal condition and the detection continues for the overdischarge detection delay time (t dl ) or longer, the s-8201 series turns the discharging control fet off to stop discharging. this condition is called the overdischarge condition. when the discharging control fet turns off, the vm pin voltage is pulled up by the resistor between vm pin and vdd pin in the ic (r vmd ). the voltage difference between vm pin and vdd pin then falls bellow 1.3 v (typ.), the current consumption is reduced to the power-down current consumption (i pdn ). this condition is called the power-down condition. the power-down condition is released when a charger is connected and the voltage difference between vm pin and vdd pin becomes 1.3 v (typ.) or higher. moreover when the battery voltage becomes the overdischarge detection voltage (v dl ) or higher the s-8201 series turns the discharging fet on and returns to the normal condition.
battery protection ic for single pack s-8201 series rev.2.0 _00 18 seiko instruments inc. 5. charger detection when a battery in the overdischarge condition is connected to a charger and provided that the vm pin voltage is lower than the charger detection voltage (v cha ), the s-8201 series releases the overdischarge condition and turns the discharging control fet on as the battery voltage becomes equal to or higher than the overdischarge detection voltage (v dl ) since the charger detection function works. this action is called charger detection. when a battery in the overdischarge condition is connected to a charger and provided that the vm pin voltage is not lower than the charger detection voltage (v cha ), the s-8201 series releases the overdischarge condition when the battery voltage reaches the overdischarge detection voltage (v dl ) + overdischarge hysteresis (v hd ) or higher. 6. abnormal charge current detection if the vm pin voltage falls below the charger detection voltage (v cha ) during charging under normal condition and it continues for the overcharge detection delay time (t cu ) or longer, the charging control fet turns off and charging stops. this action is called the abnormal charge current detection. abnormal charge current detection works when the do pin voltage is ?h? and the vm pin voltage falls below the charger detection voltage (v cha ). consequently, if an abnormal charge current flows to an over-discharged battery, the s-8201 series turns the charging control fet off and stops charging after the battery voltage becomes higher than the overdischarge detection voltage which make the do pin voltage ?h?, and still after the overcharge detection delay time (t cu ) elapses. abnormal charge current detection is released when the voltage difference between vm pin and vss pin becomes less than charger detection voltage (v cha ).
battery protection ic for single-cell pack rev.2.0_00 s-8201 series seiko instruments inc. 19 7. delay circuits the detection delay times are generated by dividing the approximate 3.5 khz clock with a counter. caution1. the detection delay time for overcurrent 2 and load and short-circuiting start when the overcurrent 1 is detected. as soon as the overcurrent 2 or load short-circuiting is detected over the detection delay time for overcurrent 2 or load short-circuiting after the detection of overcurrent 1, the s-8201 series turns the discharging control fet off. do pin vm pin v dd v dd time time v iov1 v ss v ss v iov2 overcurrent 2 detection delay time (t iov2 ) figure 9 2. when the overcurrent is detected and it continues for longer than the overdischarge detection delay time without releasing the load, the condition changes to the power- down condition when the battery voltage falls below the overdischarge detection voltage. 3. when the battery voltage falls below the overdischarge detection voltage due to the overcurrent, the s-8201 series turns the discharging control fet off by the overcurrent detection. and in this case the recovery of the battery voltage is so slow that the battery voltage after the overdischarge detection delay time is still lower than the overdischarge detection voltage, the s-8201 series transits to the power-down condition. 8. dp pin the dp pin is a test pin for delay time acceleration. when the dp pin is set to the vdd pin potential, the delay time is reduced by about 1/15 to 1/40. (25 c). the dp pin should be left open during normal operation.
battery protection ic for single pack s-8201 series rev.2.0 _00 20 seiko instruments inc. 9. 0 v battery charge function this function is used to recharge the connected battery whose voltage is 0 v due to the self-discharge. when the 0v battery charge starting charger voltage (v 0cha ) or higher is applied between eb + and eb ? pins by connecting a charger, the charging control fet gate is fixed to vdd pin voltage. when the voltage between the gate and source of the charging control fet becomes equal to or higher than the turn-on voltage by the charger voltage, the charging control fet turns on to start charging. at this time, the discharging control fet is off and the charging current flows through the internal parasitic diode in the discharging control fet. when the battery voltage becomes equal to or higher than the overdischarge release voltage (v du ), the s-8201 series enters the normal condition. caution 1. some battery providers do not recommend charging for completely self-discharged battery. please ask battery providers before determining the 0 v battery charge function. 2. the 0 v battery charge function has higher priority than the abnormal charge current detection function. consequently, a product with the 0 v battery charge function charges a battery forcedly and abnormal charge current cannot be detected when the battery voltage is low. 10. 0 v battery charge inhibition function this function inhibits the recharging when a battery which is short-circuited (0 v) internally is connected. when the battery voltage is 0.6 v (typ.) or lower, the charging control fet gate is fixed to eb ? pin voltage to inhibit charging. when the battery voltage is the 0 v battery charge inhibition battery voltage (v 0inh ) or higher, charging can be performed. caution some battery providers do not recommend charging for completely self-discharged battery. please ask battery providers before determining the 0 v battery charge function.
battery protection ic for single-cell pack rev.2.0_00 s-8201 series seiko instruments inc. 21 ? timing chart 1. overcharge and overdischarge detection v du (v dl + v hd ) v dl v cu v cl (v cu ? v hc ) v dd v ss (2) (1) (1) (1) (3) battery voltage do pin co pin vm pin charger connection load connection mode overcharge detection delay time (t dl ) note: (1) normal condition, (2) overcharge condition, (3) overdischarge condition, (4) overcurrent condition the charger is supposed to charge with constant current. overcharge detection delay time (t cu ) v dd v dd v iov1 v ss v cha v ss figure 10
battery protection ic for single pack s-8201 series rev.2.0 _00 22 seiko instruments inc. 2. overcurrent detection v cu v cl (v cu ? ? ? ? v hc ) v du (v dl + + + + v hd ) 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 1 detection delay time (t iov1 ) overcurrent 2 detection delay time (t iov2 ) load short-circuitin g detection dela y time ( t short ) battery voltage do pin co pin vm pin charger connection load connection mode note: (1) normal condition, (2) overcharge condition, (3) overdischarge condition, (4) overcurrent condition the charger is supposed to charge with constant current. figure 11
battery protection ic for single-cell pack rev.2.0_00 s-8201 series seiko instruments inc. 23 3. charger detection v cu v cl (v cu ? ? ? ? v hc ) v du (v dl + + + + v hd ) v dl v dd v ss v dd v ss v dd v ss v cha overdischarge detection delay time (t dl ) in case vm pin voltage < v cha overdischarge is released at the overdischarge detection voltage (v dl ) (1) (3) (1) battery voltage do pin co pin vm pin charger connection load connection mode note: (1) normal condition, (2) overcharge condition, (3) overdischarge condition, (4) overcurrent condition the charger is supposed to charge with constant current. figure 12
battery protection ic for single pack s-8201 series rev.2.0 _00 24 seiko instruments inc. 4. abnormal charge current detection abnormal 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 condition, (2) overcharge condition, (3) overdischarge condition, (4) overcurrent condition the charger is supposed to charge with constant current. v cu v cl (v cu ? ? ? ? v hc ) v du (v dl +v hd ) v dl v dd v ss v dd v ss v dd v ss v cha figure 13
battery protection ic for single-cell pack rev.2.0_00 s-8201 series seiko instruments inc. 25 ? example for battery protection ic connection batter y r1 470 ? c1 0.1 f vdd vss s-8201series vm co do dp r2 2 k ? fet2 fet1 eb ? eb + figure 14 table 13 constant for external components symbol parts purpose recommend min. max. remarks fet1 nch mos fet charge control ? ? ? threshold voltage overdischarge detection voltage *1 , gate to source withstand voltage charger voltage fet2 nch mos fet discharge control ? ? ? threshold voltage overdischarge detection voltage *1 , gate to source withstand voltage charger voltage r1 resistor esd protection, for power fluctuation 470 ? 300 ? 1 k ? resistance should be as small as possible to avoid lowering of the overcharge detection accuracy caused by vdd pin current. *2 c1 capacitor for power fluctuation 0.1 f 0.022 f1.0 f install a capacitor of 0.022 f or higher between vdd pin and vss pin. *3 r2 resistor protection for reverse connection of a charger 2 k ? 300 ? 4 k ? select a resistance as large as possible to prevent current when a charger is reversely connected. *4 *1. if the threshold voltage of an eft is low, the fet may not cut the charging current. if an fet with a threshold voltage equal to or higher than the overdischarge detection voltage is used, discharging may be stopped before overdischarge is detected. if the withstand voltage between the gate and source is lower than the charger voltage, the fet may destroy. *2. if r1 has a high resistance, the voltage between vdd pin and vss pin may exceed the absolute maximum rating when a charger is connected reversely since the current flows from the charger to the ic. insert a resistor of 300 ? or higher as r1 for esd protection. *3. if a capacitor of less than 0.022 f is installed as c1, do may oscillate when load short-circuiting is detected. be sure to install a capacitor of 0.022 f or higher as c1. *4. if r2 has a resistance higher than 4 k ? , the charging current may not be cut when a high-voltage charger is connected. caution 1. the dp pin should be open. 2. the above connection diagram and constants will not guarantees successful operation. perform through evaluation using the actual application to set the constant.
battery protection ic for single pack s-8201 series rev.2.0 _00 26 seiko instruments inc. ? precautions ? the application condition for input voltage, output voltage and load current should not exceed the package power dissipation. ? do not apply an electrostatic discharge to this ic that exceeds the performance ratings of the built-in electrostatic protection circuit. ? sii claims no responsibility for any and all disputes arising out of or in connection with any infringement of the products including this ic upon patents owned by a third party.
battery protection ic for single-cell pack rev.2.0_00 s-8201 series seiko instruments inc. 27 ? typical characteristics (typical data) 1. detection/release voltage temperature characteristics 4.34 4.36 4.38 4.40 4.42 4.44 -25 0 25 50 75 ta(c) v cu (v) overcharge detection voltage vs.temperature -50 100 3.92 3.94 3.96 3.98 4.00 4.02 -25 0 25 50 75 ta(c) v cl (v) overcharge release voltage vs. temperature -50 100 2.94 2.96 2.98 3.00 3.02 3.04 -25 0 25 50 75 ta(c) v dl (v) overdischarge detection voltage vs. temperature -50 100 3.34 3.36 3.38 3.40 3.42 3.44 -25 0 25 50 75 ta(c) v du (v) overdischarge release voltage vs.temperature -50 100 0.15 0.20 0.25 0.30 0.35 0.40 0.45 -25 0 25 50 75 ta(c) v iov1 (v) overcurrent1 detection voltage vs.temperature -50 100 0.40 0.45 0.50 0.55 0.60 0.65 -25 0 25 50 75 ta(c) v iov2 (v) overcurrent 2 detection voltage vs.temperature -50 100 1.0 1.1 1.2 1.3 1.4 1.5 -25 0 25 50 75 ta(c) v short (v) load short-circuiting detection voltage vs. temperature -50 100
battery protection ic for single pack s-8201 series rev.2.0 _00 28 seiko instruments inc. 2. current consumption temperature characteristics 0 1 2 3 4 5 current consumption vs.temperature in normal mode -25 0 25 50 75 ta(c) i ope ( a) -50 100 0.00 0.02 0.04 0.06 0.08 0.10 current consumption vs.temperature in power-down mode -25 0 25 50 75 ta(c) i pdn ( a) -50 100 3. current consumption power voltage characteristics (ta = = = = 25c) 0 1 2 3 4 5 6 0 2 4 6 8 10 12 v dd (v) current consumption power supply voltage dependency i ope ( a) 4. detection/release delay time temperature characteristics 0.50 0.75 1.00 1.25 1.50 -25 0 25 50 75 ta(c) t cu (s) overcharge detection delay time vs. temperature -50 100 10 20 30 40 50 60 -25 0 25 50 75 ta(c) t cl (ms) overcharge release delay time vs. temperature -50 100 100 120 140 160 180 200 -25 0 25 50 75 ta(c) t dl (ms) overdischarge detection delay time vs. temperature -50 100
battery protection ic for single-cell pack rev.2.0_00 s-8201 series seiko instruments inc. 29 5 7 9 11 13 15 -25 0 25 50 75 ta(c) t iov1 (ms) overcurrent 1 detection delay time vs. temperature -50 100 1.4 1.8 2.2 2.6 3.0 3.4 -25 0 25 50 75 ta(c) t iov2 (ms) overcurrent 2 detection delay time vs. temperature -50 100 0.16 0.20 0.24 0.28 0.32 0.36 0.40 -25 0 25 50 75 ta(c) t short (ms) load short-circuiting delay time vs. temperature -50 100 5. delay time power-voltage characteristics (ta = = = = 25c) 5 7 9 11 13 15 2 2.5 3 3.5 4 4.5 overcurrent 1 detection delay time vs. power supply voltage dependency t iov1 (ms) v dd (v) 1.4 1.8 2.2 2.6 3.0 3.4 2 2.5 3 3.5 4 4.5 v dd (v) overcurrent 2 detection delay time vs. power supply voltage dependency t iov2 (ms) 0.16 0.2 0.24 0.28 0.32 2.533.544.5 v dd (v) t short (ms) load short-circuiting delay time vs. power supply voltage dependency
battery protection ic for single pack s-8201 series rev.2.0 _00 30 seiko instruments inc. 6. co pin/do pin output current characteristics (ta = = = = 25c) -0.5 -0.4 -0.3 -0.2 -0.1 0 01234 v co (v) i co (ma) co pin source current characteristics v dd =3.5v,v m =v ss =0v 0 0.1 0.2 0.3 0.4 0.5 012345 v co (v) i co (ma) co pin sink current characteristics v dd =4.5v,v m =v ss =0v -0.5 -0.4 -0.3 -0.2 -0.1 0 01234 v do (v) i do (ma) do pin source current characteristics v dd =3.5v,v m =v ss =0v 0 0.1 0.2 0.3 0.4 0.5 00.511.52 v do (v) i do (ma) do pin sink current characteristics v dd =1.8v,v m =v ss =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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