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contents features.............................................................. 1 applications......................................................... 1 selection guide................................................... 2 block diagram..................................................... 3 pin assignment ................................................... 4 pin description.................................................... 4 absolute maximum ratings................................. 4 electrical characteristics ..................................... 5 measuremnet circuits ......................................... 7 description .......................................................... 10 operation timing charts ..................................... 13 battery protection ic connection example ......... 14 precautions ......................................................... 16 dimensions ......................................................... 17 markings ............................................................. 17 taping ................................................................ 18 characteristcs (typical characteristics) ................ 20
seiko instruments inc. 1 12 nov,1997 battery protection ic (for a single-cell pack) s-8231 series the 8231 is a series of lithium-ion rechargeable battery protection ics incorporating high-accuracy voltage detection circuits and delay circuits. it is suitable for a single-cell lithium-ion battery pack. features (1) internal high-accuracy voltage detection circuit over charge detection voltage 4.00 v 25 mv to 4.60 v 25 mv 5 mv- step over charge release voltage 3.70 v 50 mv to 4.60 v 50m v 5 mv- step (the over charge release voltage can be selected within the range where the difference from over charge detection voltage is 0 to 0.3 v) over discharge detection voltage 1.70 v 80 mv to 2.50 v 80 mv 50 mv- step over discharge release voltage 1.70 v 100 mv to 3.50 v 100 mv 50 mv - step (the over discharge release voltage can be selected within the range where a difference from over discharge detection voltage is 0 to 1.0v) over current detection voltage 1 0.06 v 20 mv to 0.30 v 20 mv 5 mv-step (2) high input-voltage device (absolute maximum rating: 18 v) (3) wide operating voltage range: 1.5 v to 16 v (4) the delay time for every detection can be set via an external capacitor. each delay time for over charge detection, over discharge detection, over current detection are proportion of hundred to ten to one. or proportion of fifty to ten to one. (5) two over current detection levels (protection for short-circuiting) (6) internal auxiliary over voltage detection circuit (fail safe for over voltage) (7) internal charge circuit for 0v battery (unavailable is option) (8) low current consumption operation 7.5 m a typ. 13.7 m a max. (-40 to +85 c) power-down mode 0.2 na typ. 0.14 m a max. (-40 to +85 c) (9) msop package (8-pin) 4.0 mm2.95 mm applications lithium-ion rechargeable battery packs the information herein is subject to change without notice.
battery protection ic (for a single-cell pack) s-8231 series 12 nov , 1997 seiko instruments inc. 2 selection guide(12 nov , 1997) table1 model / item over charge detection voltage over charge release voltage over discharge detection voltage over discharge release voltage over current detection voltage1 over charge detection delay (c2=0.047 m f) 0v battery charging function s-8231aafn 4.25v25mv 4.0550mv 2.30v80mv 2.70v100mv 0.100v20mv 1.0 sec available s-8231abfn 4.35v25mv 4.1050mv 2.30v80mv 3.00v100mv 0.100v20mv 1.0 sec available s-8231acfn 4.25v25mv 4.0550mv 2.30v80mv 2.50v100mv 0.120v20mv 0.5 sec unavailable s-8231adfn 4.25v25mv 4.0550mv 2.30v80mv 2.50v100mv 0.240v20mv 0.5 sec unavailable s-8231aefn 4.25v25mv 3.9550mv 2.30v80mv 3.00v100mv 0.100v20mv 1.0 sec available s-8231agfn 4.25v25mv 4.0550mv 2.30v80mv 2.70v100mv 0.150v20mv 1.0 sec available s-8231ahfn 4.35v25mv 4.2850mv 2.30v80mv 2.80v100mv 0.100v20mv 1.0 sec available s-8231aifn 4.25v25mv 4.05v *2 2.30v80mv 2.70v100mv 0.150v20mv 1.0 sec available s-8231ajfn 4.25v25mv 4.0550mv 2.30v80mv 2.50v100mv 0.120v20mv 0.5 sec available s-8231akfn 4.25v25mv 4.0550mv 2.30v80mv 2.50v100mv 0.240v20mv 0.5 sec available s-8231alfn 4.295v25mv 4.2050mv *3 2.50v80mv 3.00v100mv 0.150v20mv 1.0 sec unavailable s-8231amfn 4.25v25mv 4.0550mv 2.30v80mv 2.70v100mv 0.130v20mv 1.0 sec unavailable s-8231anfn 4.35v25mv 4.1050mv 2.30v80mv 3.00v100mv 0.100v20mv 0.5 sec unavailable s-8231aofn 4.295v25mv 4.295v *1,3 2.30v80mv 3.00v100mv 0.300v20mv 1.0 sec unavailable s-8231aqfn 4.20v25mv 4.1050mv 2.30v80mv 2.50v100mv 0.200v20mv 1.0 sec unavailable s-8231arfn 4.20v25mv 4.1050mv 2.30v80mv 2.50v100mv 0.100v20mv 1.0 sec unavailable s-8231asfn 4.12v25mv 4.12 *1,3 2.30v80mv 2.50v100mv 0.200v20mv 1.0 sec unavailable s-8231atfn 4.35v25mv 4.1050mv 2.30v80mv 3.00v100mv 0.250v20mv 1.0 sec available s-8231avfn 4.28v25mv 4.0550mv 2.30v80mv 2.70v100mv 0.130v20mv 1.0 sec unavailable s-8231awfn 4.28v25mv 4.1850mv 2.30v80mv 2.90v100mv 0.080v20mv 1.0 sec unavailable *1) without over charge detection / release hysteresis. *2) discharging will be unable when over charge detected. (over charge lock type) *3) auxiliary over charge detection voltage(vcuaux) is vcuaux = vcu(over charge detection voltage) x 1.10, which is fixed internally. the others are vcuaux = vcu x 1.24. change in the detection voltage is available in products other than the above listed ones. please contact with our sales division. the over discharge detection voltage can be selected within the range from 1.7 to 3.0v. when the over discharge detection voltage is higher than 2.5v, the over charge detection voltage and the over charge release voltage are limited as follows table. table 2 over discharge detection voltage (vdd) over charge detection voltage (vcu) voltage difference between over charge detection voltage and over charge release voltage 1.70 to 2.50 v 4.00 to 4.60 v 0 to 0.30 v 1.70 to 2.70 v 4.00 to 4.50 v 0 to 0.20 v 1.70 to 3.00 v 4.00 to 4.35 v 0 to 0.10 v
battery protection ic (for a single-cell pack) 12 nov , 1997 s-8231 series seiko instruments inc. 3 block diagram control logic over discharge reference voltage over current detection circuit delay circuit - + - + vm ict vss sens vcc co do - - + delay circuit control si g nal control signal over charge auxiliary over charge delay circuit control signal delay circuit control signal rcol figure 1 output impedance when co terminal output l is higher than do terminal. resistor (rcol) is connected with co terminal. please refer electric characteristics.
battery protection ic (for a single-cell pack) s-8231 series 12 nov , 1997 seiko instruments inc. 4 pin assignment top view do ict nc vss sens vcc vm co 1 2 3 4 5 6 8 7 figure 2 msop - 8 pin description table.3 no. name description 1 sens detects voltage between vss to sens(over charge/discharge detection pin) 2 do connects fet gate for discharge control (cmos output) 3 co connects fet gate for charge control (cmos output) 4 vm detects voltage between vss to vm(over current detection pin) 5 vss negative power input 6 ict connects capacitor for every detection delay circuit 7 nc non connect 8 vcc positive power input and connects battery positive voltage absolute maximum ratings table 4 ta = 25 c item sym. applied pins rating unit input voltage between vcc and vss vds vcc vss-0.3 to vss+18 v ict input terminal voltage vict ict vss-0.3 to vcc+0.3 v vm input terminal voltage vvm vm vcc-18 to vcc+0.3 v do output terminal voltage vdo do vss-0.3 to vcc+0.3 v co output terminal voltage vco co vm-0.3 to vcc+0.3 v power dissipation pd 150 mw operating temperature range topr -40 to +85 c storage temperature range tstg -40 to +125 c
battery protection ic (for a single-cell pack) 12 nov , 1997 s-8231 series seiko instruments inc. 5 electrical characteristics table 5 ta = 25 c item symbol condition circuit notice min. typ. max. unit detection voltage over charge detection voltage vcu 1 1 4.00 to 4.60 adjustment vcu -0.025 vcu vcu +0.025 v auxiliary over charge detection voltage vcuaux 1 1 vcu1.24 fixed type vcu 1.20 vcu 1.24 vcu 1.28 v vcuaux 1 1 vcu1.10 fixed type vcu 1.06 vcu 1.10 vcu 1.14 v over charge release voltage vcd 1 1 3.70 to 4.60 adjustment vcd-0.05 vcd vcd+0.05 v over discharge detection voltage vdd 1 1 1.70 to 2.50 adjustment vdd-0.08 vdd vdd+0.08 v over discharge release voltage1 vdu 1 1 1.70 to 3.50 adjustment vdu-0.10 vdu vdu+0.10 v over current detection voltage1 viov1 2 1 0.06 to 0.30v adjustment viov1 -0.020 viov1 viov1 +0.020 v over current detection voltage 2 viov2 2 1 vcc reference -1.72 -1.35 -0.98 v voltage temperature factor 1 tcoe1 (*1)ta=-40 to 85c -0.5 0 0.5 mv/ c voltage temperature factor 2 tcoe2 (*2)ta=-40 to 85c -0.15 0 0.15 mv/ c delay time(c2=0.047 m f) over charge detection delay time tcu 7 5 1.0 s type 0.72 1.0 1.32 s tcu 7 5 0.5 s type 0.36 0.5 0.66 s over discharge detection delay time tdd 7 5 0.1 s 71 100 139 ms over current detection delay time tiov1 8 5 0.01 s 6.8 10 13.8 ms input voltage input voltage between vcc and vss vds --- --- absolute maximum rating -0.3 --- 18 v operating voltage operating voltage between vcc and vss vdsop --- --- (*3) 1.5 --- 16 v current consumption current consumption (during normal operation) iope 3 2 vcc=3.6v 2.3 7.5 12.2 m a current consumption at power down ipdn 3 2 vcc=1.5v 0 0.0002 0.06 m a output voltage do h voltage vdo(h) 5 3 iout=10ua vcc-0.07 vcc-0.006 vcc v do l voltage vdo(l) 5 3 iout=10ua vss vss+0.006 vss+0.07 v co h voltage vco(h) 6 4 iout=10ua vcc-0.25 vcc-0.032 vcc v co pin internal resistance resistance between vss and co rcol 6 4 vss-co=4.7v 0.29 0.60 1.43 m w internal resistance resistance between vcc and vm rvcm 4 2 vcc-vm=0.5v 0.07 0.16 0.38 m w resistance between vss and vm rvsm 4 2 vss-vm=1.1v 0.73 1.05 1.73 m w 0v battery charging function 0v charge starting voltage v0cha 9 6 0v batt. cha. available 0.52 0.73 1.32 v 0v charge inhibiting voltage v0inh 10 6 0v batt. cha. unavailable 0.40 0.61 1.11 v (*1) voltage temperature factor 1 indicates over charge detection voltage, over charge release voltage, over discharge detecti on voltage, and over discharge release voltage. (*2)voltage temperature factor 2 indicates over current detection voltage. (*3) the do and co logic must be established for the operating voltage.
battery protection ic (for a single-cell pack) s-8231 series 12 nov , 1997 seiko instruments inc. 6 table 6 ta = -40 ~ +85 c item symbol condition circuit notice min. typ. max. unit detection voltage over charge detection voltage vcu 1 1 4.00 to 4.60 adjustment vcu1 -0.060 vcu vcu1 +0.035 v auxiliary over charge detection voltage vcuaux 1 1 vcu1.24 fixed type vcu 1.18 vcu 1.24 vcu 1.30 v vcuaux 1 1 vcu1.10 fixed type vcu 1.04 vcu 1.10 vcu 1.16 v over charge release voltage vcd 1 1 3.70 to 4.60 adjustment vcd-0.085 vcd vcd+0.060 v over discharge detection voltage vdd 1 1 1.70 to 2.50 adjustment vdd-0.115 vdd vdd+0.090 v over discharge release voltage1 vdu 1 1 1.70 to 3.50 adjustment vdu-0.135 vdu vdu+0.110 v over current detection voltage1 viov1 2 1 0.06 to 0.30v adjustment viov1 -0.030 viov1 viov1 +0.030 v over current detection voltage 2 viov2 2 1 vcc reference -1.85 -1.35 -0.86 v voltage temperature factor 1 tcoe1 (*1)ta=-40 to 85c -0.5 0 0.5 mv/c voltage temperature factor 2 tcoe2 (*2)ta=-40 to 85c -0.15 0 0.15 mv/c delay time(c2=0.047 m f) over charge detection delay time tcu 7 5 1.0 s type 0.64 1.00 1.46 s tcu 7 5 0.5 s type 0.32 0.50 0.73 s over discharge detection delay time tdd 7 5 0.1 s 54 100 212 ms over current detection delay time tiov1 8 5 0.01 s 6.7 10 14.1 ms input voltage input voltage between vcc and vss vds --- --- absolute maximum rating -0.3 --- 18 v operating voltage operating voltage between vcc and vss vdsop --- --- (*3) 1.5 --- 16 v current consumption current consumption (during normal operation) iope 3 2 vcc=3.6v 2.0 7.5 13.7 m a current consumption at power down ipdn 3 2 vcc=1.5v 0 0.0002 0.14 m a output voltage do h voltage vdo(h) 5 3 iout=10ua vcc-0.19 vcc-0.006 vcc v do l voltage vdo(l) 5 3 iout=10ua vss vss+0.006 vss+0.19 v co h voltage vco(h) 6 4 iout=10ua vcc-0.37 vcc-0.032 vcc v co pin internal resistance resistance between vss and co rcol 6 4 vss-co=4.7v 0.22 0.60 2.18 m w internal resistance resistance between vcc and vm rvcm 4 2 vcc-vm=0.5v 0.05 0.16 0.58 m w resistance between vss and vm rvsm 4 2 vss-vm=1.1v 0.56 1.05 2.63 m w 0v battery charging function 0v charge starting voltage v0cha 9 6 0v batt. cha. available 0.40 0.73 1.45 v 0v charge inhibiting voltage v0inh 10 6 0v batt. cha. unavailable 0.28 0.61 1.24 v (*1) voltage temperature factor 1 indicates over charge detection voltage, over charge release voltage, over discharge detecti on voltage, and over discharge release voltage. (*2)voltage temperature factor 2 indicates over current detection voltage. (*3) the do and co logic must be established for the operating voltage.
battery protection ic (for a single-cell pack) 12 nov , 1997 s-8231 series seiko instruments inc. 7 measurement circuits (1) measurement 1 measurement circuit 1 set s1=off, v1=3.6v, and v2=0v under normal condition. increase v1 from 3.6v gradually. the v1 voltage when co = 'l' is over charge detection voltage 1 (vcu). decrease v1 gradually. the v1 voltage when co = 'h' is over charge release voltage 1 (vcd). further decrease v1. the v1 voltage when do = 'l' is over discharge voltage 1 (vdd). increase v1 gradually. the v1 voltage when do = 'h' is over discharge release voltage 1 (vdu). set s1=on,and v1=3.6v and v2=0v under normal condition. increase v1 from 3.6v gradually. the v1 voltage when co = 'l' is auxiliary over charge detection voltage 1 (vcuaux). (2) measurement 2 measurement circuit 1 set s1=off,v1=3.6v, and v2=0v under normal condition. increase v2 from 0v gradually. the v2 voltage when do = 'l' is over current detection voltage 1 (viov1). set s1=on,v1=3.6v, and v2=0v under normal condition. increase v2 gradually from 0v (the voltage change rate < 1.0v/msec). (v2-v1) voltage when do = 'l' is over current detection voltage 2 (viov2). (3) measurement 3 measurement circuit 2 set s1=on, v1=3.6v, and v2=0 v under normal condition and measure current consumption. current consumption i1 is the normal condition current consumption (iope). set s1=off, v1=v2=1.5 v under over discharge condition and measure current consumption. current consumption i1 is the power-down current consumption (ipdn). (4) measurement 4 measurement circuit 2 set s1=on, v1=1.5v and v2=1.0v under over discharge condition. (v1-v2)/i2 is the internal resistance between vcc and vm (rvcm). set s1=on, v1=3.6 v, and v2=1.1v under over current condition. v2/i2 is the internal resistance between vss and vm (rvsm). (5) measurement 5 measurement circuit 3 set s1=on, s2=off, v1=3.6v, and v2=0v under normal condition. increase v3 from 0 v gradually. the v3 voltage when i1 = 10 m a is do 'h' voltage (vdo (h)). set s1=off, s2=on, v1=3.6v, and v2=0.5 v under over current condition. increase v4 from 0 v gradually. the v4 voltage when i2 = 10 m a is the do 'l' voltage (vdo (l)). (6) measurement 6 measurement circuit 4 set s1=on, s2=off, v1=3.6v and v2=0 v under normal condition. increase v3 from 0 v gradually. the v3 voltage when i1 = 10 m a is the co'h' voltage (vco (h)). set s1=off s2=on, v1=4.7 v2=0 v and v4=4.7v under over voltage condition. (v4)/i2 is the co pin internal resistance (rcol).
battery protection ic (for a single-cell pack) s-8231 series 12 nov , 1997 seiko instruments inc. 8 (7) measurement 7 measurement circuit 5 set v1=3.6v , v2=0 v and v1 = (vcu - 0.2v) under normal condition. increase v1 from (vcu - 0.2v) to (vcu + 0.2v) immediately (within 10 m s). the time after v1 becomes (vcu + 0.2v) until co goes 'l' is the over charge detection delay time (tcu). set v1=3.6v , v2=0v and v1 = (vdd + 0.2v) under normal condition. decrease v1 from (vdd + 0.2v) to (vdd - 0.2 v) immediately (within 10 m s). the time after v1 becomes (vdd - 0.2 v) until do goes 'l' is the over discharge detection delay time 1 (tdd). (8) measurement 8 measurement circuit 5 set v1=3.6v under normal condition. increase v2 from 0 v to 0.5 v immediately (within 10 m s). the time after v2 becomes 0.5v until do goes 'l' is the over current detection delay time 1 (tiov1). (9) measurement 9 measurement circuit 6 set v1=0 v, and v2=2 v, and decrease v2 gradually. the v2 voltage when co = 'l' (vcc- 0.3 v or lower) is the 0v charge starting voltage (v0cha). (10) measurement 10 measurement circuit 6 set v1=0 v, and v2=16 v, and increase v1 gradually. the v1 voltage when co = 'h' (vm+0.3 v or higher) is the 0v charge inhibiting voltage (v0inh).
battery protection ic (for a single-cell pack) 12 nov , 1997 s-8231 series seiko instruments inc. 9 vss do co vm ict vcc sens v1 s1 s8231 series v2 measurement circuit 1 vss do co vm ict vcc sens v1 v2 s1 i1 i2 s8231 series measurement circuit 2 vss do co vm ict vcc sens v1 v2 v3 s1 v4 s2 i1 i2 s8231 series vss do co vm ict vcc sens v1 v2 i1 v3 s1 v4 s2 i2 s8231 series measurement circuit 3 measurement circuit 4 vss do co vm ict vcc sens v1 c2 c2 = 0.047 m f v2 s8231 series measurement circuit 5 vss do co vm ict vcc sens v1 4.7m w v2 s8231 series measurement circuit 6
battery protection ic (for a single-cell pack) s-8231 series 12 nov , 1997 seiko instruments inc. 10 description normal condition(*1) this ic monitors the voltages of the battery and the discharge current to control charging and discharging. if the voltages of the battery is in the range from the over discharge detection voltage (vdd) to the over charge detection voltage (vcu), and the current flowing through the battery becomes equal or lower than a specified value (the vm terminal voltage is equal or lower than over current detection voltage 1), the charging and discharging fets turn on. in this condition, charging and discharging can be carried out freely. this condition is called the normal condition. in this condition, the vm and vss terminals are shorted by the rvsm resistor. over current condition if the discharging current becomes equal to or higher than a specified value (the vm terminal voltage is equal to or higher than the over current detection voltage) during discharging under normal condition and it continues for the over current detection delay time (tiov1) or longer, the discharging fet turns off to stop discharging. this condition is called an over current condition. the vm and vss terminals are shorted by the rvsm resistor at this time. also the charging fet turns off. when the discharging fet is off and a load is connected, the vm terminal voltage equals the vcc potential. the over current condition returns to the normal condition when the load is released and the impedance between the eb- and eb+ terminals (see figure 7 for a connection example) is 200m w or higher. when the load is released, the vm terminal, which and the vss terminal are shorted with the rvsm resistor, goes back to the vss potential. the ic detects that the vm terminal potential returns to over current detection voltage 1 (viov1) and returns to the normal condition. over charge condition the over charge condition is detected in two cases: (1) if the battery voltages becomes higher than the over charge detection voltage (vcu) during charging under normal condition and it continues for the over charge detection delay time (tcu) or longer, the charging fet turns off to stop charging. (2) if the battery voltages becomes higher than the auxiliary over charge detection voltage (vcuaux) the charging fet turns off immediately to stop charging. the vm and vss terminals are shorted by the rvsm resistor under the over charge condition. the auxiliary over charge detection voltage (vcuaux) is fixed internally and calculated by the over charge detection voltage (vcu) as follows: vcuaux [v] = 1.24 x vcu [v] [ for without over charge detection / release hysteresis ] vcuaux [v] = 1.10 x vcu [v] the over charge condition is released in two cases: the battery voltage which exceeded the over charge detection voltage (vcu) falls below the over charge release voltage (vcd), the charging fet turns on and the normal condition returns. if the battery voltage which exceeded the over charge detection voltage (vcu) is equal or higher than the over charge release voltage (vcd), but the charger is removed, a load is placed, and discharging starts, the charging fet turns on and the normal condition returns.
battery protection ic (for a single-cell pack) 12 nov , 1997 s-8231 series seiko instruments inc. 11 the release mechanism is as follows: the discharge current flows through an internal parasitic diode of the charging fet immediately after a load is installed and discharging starts, and the vm terminal voltage increases by about 0.6 v from the vss terminal voltage momentarily. the ic detects this voltage (over current detection voltage 1 or higher), releases the over charge condition and returns to the normal condition. note: function of [ over charge lock type (s-8231aifn) ] if the battery voltages becomes higher than the over charge detection voltage (vcu), the charging fet turns off to stop charging. when a load is placed, at that condition, the discharging fet turns off too. both charging and discharging are unable once over charge detected. this mechanism can realize more safety li-ion battery pack. over discharge condition if the battery voltages falls below the over discharge detection voltage (vdd) during discharging under normal condition and it continues for the over discharge detection delay time (tdd) or longer, the discharging fet turns off and discharging stops. this condition is called the over discharge condition. when the discharging fet turns off, the vm terminal voltage becomes equal to the vcc voltage and the ic's current consumption falls below the power-down current consumption (ipdn). this condition is called the power-down condition. the vm and vcc terminals are shorted by the rvcm resistor under the over discharge and power-down conditions. the power-down condition is canceled when the charger is connected and the voltage between vm and vcc is 1.35 v or higher (over current detection voltage 2). when the battery voltages becomes equal to or higher than the over discharge release voltage (vdu) in this condition, the over discharge condition changes to the normal condition. delay circuits the over charge detection delay time (tcu), over discharge detection delay time (tdd), and over current detection delay time 1 (tiov1) are changed with external capacitors (c2).the delay time for over charge and over discharge and over current detection is changed via an external capacitor. those three detection delay times are consistent with each other, describe as below. [for tcu=1.0 s type] over charge delay time : over discharge delay time: over current delay time = 100 : 10 : 1 [for tcu=0.5 s type] over charge delay time : over discharge delay time: over current delay time = 50 : 10 : 1
battery protection ic (for a single-cell pack) s-8231 series 12 nov , 1997 seiko instruments inc. 12 the delay times are calculated by the following equations: (ta=-40 ~ +85 c) over charge detection delay time min typ. max. [ tcu=1.0 s type ] tcu[s] = delay factor ( 13.62, 21.28, 31.06 ) x c2 [uf] [ tcu=0.5 s type ] tcu[s] = delay factor ( 6.809, 10.63, 15.53 ) x c2 [uf] over discharge detection delay time tdd[s] = delay factor ( 1.149, 2.128, 4.511 ) x c2 [uf] over current detection delay time tiov1[s] = delay factor ( 0.143, 0.213, 0.300 ) x c2 [uf] ! note:the delay time for over current detection 2 is fixed by an internal ic circuit. the delay time cannot be changed via an external capacitor. 0v battery charging function (*2) this function is used to recharge the connected battery after it self-discharge to 0v. when the 0v charging start voltage (v0cha) or higher is applied to between vm and vcc by connecting the charger, the charging fet gate is fixed to vcc potential. when the voltage between the gate sources of the charging fet becomes equal to or higher than the turn- on voltage by the charger voltage, the charging fet turns on to start charging. at this time, the discharging fet turns off and the charging current flows through the internal parasitic diode in the discharging fet. if the battery voltages become equal to or higher than the over discharge release voltage (vdu), the normal condition returns. 0v battery charge inhibiting function (*2) this function is used to inhibit recharge the connected battery after it self-discharge to 0v or shorted internally. if the battery voltages become 0.6v or lower, the charging fet gate is fixed to eb- potential. if the battery voltages is 0.6v or higher, the charging fet gate turns on. 4.7m w resistor is required between co terminal and eb- terminal. please refer figure 5. (*1) if the battery voltages is equal to or lower than the over discharge release voltage (vdu) when they are connected for the first time, the normal condition may not be entered. if the vm terminal voltage is made equal to or lower than the vss voltage (if a charger is connected), the normal condition is entered. (*2) some battery providers do not recommend charge for 0v batteries(complete self-discharged). please refer to battery providers.
battery protection ic (for a single-cell pack) 12 nov , 1997 s-8231 series seiko instruments inc. 13 operation timing charts 1. over charge and over discharge detection vcu vcd vdu vdd vcc vss vcc vss vcha vcc vss vcha vcuaux battery voltage do terminal co terminal vm terminal mode charger connecte load connecte note: normal mode, over charge mode, over discharge mode, over current mode the charger is assumed to charge with a constant current. delay delay figure 3 2. over current detection vcc viov2 vcc vss viov1 vcu vcd vdu vdd vcc vss vss battery voltage do termina l co termina vm termina l mode charger connected load connecte note: normal mode, over charge mode, over discharge mode, over current mode the charger is assumed to charge with a constant current. dela y tiov1 dela y tiov2 figure 4
battery protection ic (for a single-cell pack) s-8231 series 12 nov , 1997 seiko instruments inc. 14 battery protection ic connection example eb+ eb - s-8231 series 1k w vss battery do vcc ict r3 c1 c2 co vm delay time setting fet1 fet2 r2 sens r1 0.047 m f 1k w 1k w 0.047 m f r4 4.7m w figure 5 circuit table 7 constant symbol parts purpose recommend min. max. remarks fet1 nch mosfet charge control ----- ----- ----- ----- fet2 nch mosfet discharge control ----- ----- ----- ----- r1 chip resistor for esd 1k w 300 w 1k w *1) c1r1>2.21e-5 is recommended c1 chip capacitor filter 0.047 m f 0.022 m f1 m f *1) c1r1>2.21e-5 is recommended r2 chip resistor for esd 1k w =r1min =r1max *2) put same value resistor as r1 c2 chip capacitor setting delay time 0.047 m f0 m f 1.0 m f *3) note leak current of c2 r3 chip resistor protection at reverse connecting of a charger 1k w 300 w 5k w *4) 300 w or higher resistor is necessary. r4 chip resistor 0v battery charge prevent (4.7m w ) (1.0m w ) (10m w ) *5) lower resistor increases current consumption.
battery protection ic (for a single-cell pack) 12 nov , 1997 s-8231 series seiko instruments inc. 15 *1) r1 and c1 prevent from oscillation under over current condition. c1 x r1 > 2.2 x 1e-5 is required. if c1 x r1 is lower than 2.2 x 1e-5, condition moved to power down mode when load is shorted. *2) r2 =r1 is required. over charge detection voltage is increased by r2. for example 10k w (r2) increase over charge detection voltage by 6.3mv. *3) the over charge detection delay time(tcu), the over discharge detection delay time(tcd), and the over current detection delay time(tiov) are changed with external capacitor c2. see the electrical characteristics. *4) r3 is necessary to protect the ic when the charger is connected in reverse. connect 300 w or more. but excessive r3 causes increasing of over current detection voltage 1 (viov1). please refer the following formulation. d viov1=(r3+rvsm)/rvsmviov1-viov1 for example 50k w (r3) increase over current detection voltage 1 (viov1=0.100v) by 19mv. *5) 4.7m w (r4) prevents 0v battery from charging. current consumption is increased by r4. don t connect r4 for 0v charging available type. !note: the above connection diagram and constants do not guarantee proper operations. evaluate your actual application and set constants properly.
battery protection ic (for a single-cell pack) s-8231 series 12 nov , 1997 seiko instruments inc. 16 precautions after the over current detection delay, if the battery voltage is equal to the over discharge detection voltage(vdd) or lower, the over discharge detection delay time becomes shorter than 10ms(min.). it occurs because capacitor c2 sets all delay times. [ cause ] capacitor c2 sets all delay times. when over current detection is released until tiov1 , the capacitor c2 is being charged by s-8231. if the battery voltage is lower than vdd at that time, charging to c2 goes on. so delay time is shorter than typical under the condition. [ conclusion ] this phenomenon occurs when battery voltage is nearly equal to the over discharge voltage(vdd) after over current detected. it means that the battery capacity is small and must be charged in the near future. even if the state changes to over discharge condition , the battery package capacity is same as typical. (refer fig.6) vcc viov2 vcu vcd vdu vdd vcc vss discharge to load load connect viov1 vss over discharge delay time the over current returns to normal current. over discharge detected the battery voltages is equal to or less the over discharge voltage. the delay time becomes shorter than usual. battery voltage do terminal vm terminal figure 6
battery protection ic (for a single-cell pack) 12 nov , 1997 s-8231 series seiko instruments inc. 17 dimensions figure7 markings 2.95 0.1 8 5 1 4 2.8 0.2 4.0 0.3 0.45 0.2 0.13 +0.1 -0.05 (1) ~ (3) : product name (4) : assembly year(last digit of the year) (5): assembly month(1~ 9,x,y,z) (6): assembly week(1~ 3) figure8 0.65 0.1 0.2 0.1 f 0.12 m 0.1 to 0.15 1.3 max. 1.1 0.05 (unit: mm) (4) (3) (2) (1) (5) (6) 8 5 1 4
battery protection ic (for a single-cell pack) s-8231 series 12 nov , 1997 seiko instruments inc. 18 taping 1. tape specifications f 1.050.05 f 1.550.05 4.00.1 2.00.1 4.00.1 3.10.15 0.3 0.30.05 1.350.15 feed direction t2 1.750.1 5.50.05 (4.75) 12.00.2 4.3 +0.2 -0.15 5 max figure 9 unit : mm
battery protection ic (for a single-cell pack) 12 nov , 1997 s-8231 series seiko instruments inc. 19 2. reel specifications one reel holds 3000 ics. f 180 +0 -3 10.50.4 2.00.2 (60 ) eiaj-rrm-008 np 13.00.3 15.41.0 16.5max. (1.5) f 13.00.2 (60 ) f 60 +1 -0 figure 10 unit : mm
battery protection ic (for a single-cell pack) s-8231 series 12 nov , 1997 seiko instruments inc. 20 characteristics (typical characteristics) detection voltage temperature characteristics over charge detection voltage vs. temperature over charge release voltage vs. temperature 4.2 4.3 4.4 -40 -20 0 20 40 60 80 100 ta[ c] vcu [v] vcu=4.30[v] 3.9 4 4.1 -40 -20 0 20 40 60 80 100 ta[ c] vcd [ v ] vcd=4.00[v] over discharge detection voltage vs. temperature over discharge release voltage vs. temperature 1.9 2 2.1 -40 -20 0 20 40 60 80 100 ta[ c] vdd [v] vdd=2.00[v] 2.5 2.6 2.7 -40 -20 0 20 40 60 80 100 ta[ c] vdu [ v ] vdu=2.60[v] over current 1 detection voltage vs. temperature over current 2 detection voltage vs. temperature 0.07 0.1 0.13 -40 -20 0 20 40 60 80 100 ta[ c] viov1 [ v ] viov1=0.1[v] 1 1.2 1.4 1.6 -40 -20 0 20 40 60 80 100 ta[ c] viov2 [v] viov2=1.35[v] (vcc reference)
battery protection ic (for a single-cell pack) 12 nov , 1997 s-8231 series seiko instruments inc. 21 2. current consumption temperature characteristics current consumption vs. temperature in normal mode current consumption vs. temperature in power-down mode 0 2 4 6 8 10 12 14 -40 -20 0 20 40 60 80 100 ta[ c] iope [ ua ] vcc=3.60[v] 0 50 100 -40-20 0 20406080100 ta[ c] ipdn [na] vcc=1.50[v] 3. delay time temperature characteristics over charge detection time vs. temperature over discharge detection time vs. temperature 0.5 1 1.5 -40 -20 0 20 40 60 80 100 ta[ c] tcu [ s ] c2=0.047[uf] | vcc=4.3[v] 50 100 150 -40-20 0 20406080100 ta[ c] tdd [ms] c2=0.047[uf] vcc=1.9[v] over current 1 detection time vs. temperature 5 10 15 -40 -20 0 20 40 60 80 100 ta[ c] tiov1 [ ms ] c2=0.047[uf] vcc=3.6[v]
battery protection ic (for a single-cell pack) s-8231 series 12 nov , 1997 seiko instruments inc. 22 * please design all applications of the s-8231 series with safety in mind.
*1) without over charge detection / release hysteresis. *2) both charging and discharging will be unable when over charge detected. (over charge lock type) *3) in the range between 0?c and 50?c, an accuracy of detection volt- age is assured as 30mv. model/item s-8231aafn-caa-t2 s-8231abfn-cab-t2 s-8231acfn-cac-t2 s-8231adfn-cad-t2 s-8231aefn-cae-t2 s-8231agfn-cag-t2 s-8231ahfn-cah-t2 s-8231aifn-cai-t2 s-8231ajfn-caj-t2 s-8231akfn-cak-t2 s-8231alfn-cal-t2 s-8231amfn-cam-t2 s-8231anfn-can-t2 s-8231aofn-cao-t2 s-8231aqfn-caq-t2 s-8231arfn-car-t2 s-8231asfn-cas-t2 s-8231atfn-cat-t2 s-8231aufn-cau-t2 s-8231avfn-cav-t2 s-8231awfn-caw-t2 s-8231axfn-cax-t2 s-8231ayfn-cay-t2 s-8231bafn-cca-t2 s-8231bbfn-ccb-t2 4.25 4.35 4.25 4.25 4.25 4.25 4.35 4.25 4.25 4.25 4.295 4.25 4.35 4.295 4.20 4.20 4.12 4.35 4.28 4.28 4.28 4.295 4.35 4.18 *3 4.18 *3 4.05 4.10 4.05 4.05 3.95 4.05 4.28 4.05 *2 4.05 4.05 4.20 4.05 4.10 4.295 *1 4.10 4.10 4.12 *1 4.10 4.05 4.05 4.18 4.295 *1 4.28 3.98 4.08 2.30 2.30 2.30 2.30 2.30 2.30 2.30 2.30 2.30 2.30 2.50 2.30 2.30 2.30 2.30 2.30 2.30 2.30 2.30 2.30 2.30 2.30 2.30 2.60 2.30 2.70 3.00 2.50 2.50 3.00 2.70 2.80 2.70 2.50 2.50 3.00 2.70 3.00 3.00 2.50 2.50 2.50 3.00 2.70 2.70 2.90 3.00 2.80 2.90 2.90 0.100 0.100 0.120 0.240 0.100 0.150 0.100 0.150 0.120 0.240 0.150 0.130 0.100 0.300 0.200 0.100 0.200 0.250 0.130 0.130 0.080 0.300 0.100 0.110 0.110 1.0 1.0 0.5 0.5 1.0 1.0 1.0 1.0 0.5 0.5 1.0 1.0 0.5 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 available available unavailable unavailable available available available available available available unavailable unavailable unavailable unavailable unavailable unavailable unavailable available available unavailable unavailable unavailable available available availabl 1.24 1.24 1.24 1.24 1.24 1.24 1.24 1.24 1.24 1.24 1.10 1.24 1.24 1.10 1.24 1.24 1.10 1.24 1.24 1.24 1.24 unavailable unavailable 1.24 1.24 accuracy differs depending on products. 25mv accuracy 50mv accuracy 80mv accuracy 100mv accuracy 20mv accuracy 50mv accuracy 80mv accuracy 100mv accuracy 20mv accuracy a series b series over charge detection voltage (v) over charge release voltage (v) over discharge detection voltage (v) over discharge release voltage (v) over current detection voltage over charge detection delay (c=0.047 f)(sec) 0v battery charging function final over charge magnification change in the detection voltage is available in products other than the above listed ones. contact the sii semiconductor products sales department.

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