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rev.1.0 _00 battery protection ic for 1-cell pack S-8211E series seiko instruments inc. 1 the S-8211E series has the high-accuracy voltage detection circuit and the delay circuit. this ic is suitable for monitoring overcharge and overdischarge of 1-cell lithium ion / lithium polymer secondary battery pack. ? features (1) high-accuracy voltage detection circuit ? overcharge detection voltage 3.6 v to 4.4 v (5 mv step) accuracy 25 mv ( + 25 c) accuracy 30 mv ( ? 5 c to + 55 c) ? overcharge release voltage 3.5 v to 4.4 v *1 accuracy 50 mv ? 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 (2) detection delay times are generated by an internal circuit (external capacitors are unnecessary) accuracy 20% (3) wide operating temperature range ? 40 c to + 85 c (4) low current consumption ? operation mode 3.0 a typ., 5.5 a max. ( + 25 c) ? overdischarge mode 2.0 a typ., 3.5 a max. ( + 25 c) (5) small package: sot-23-5, snt-6a (6) lead-free product *1. overcharge release voltage = overcharge detection voltage ? overcharge hysteresis voltage (overcharge hysteresis voltage can be selected as 0 v or from a range of 0.1 v to 0.4 v in 50 mv step.) *2. overdischarge release voltage = overdischarge detection voltage + overdischarge hysteresis voltage (overdischarge hysteresis voltage can be selected as 0 v or from a range of 0.1 v to 0.7 v in 100 mv step.) ? applications ? lithium-ion rechargeable battery packs ? lithium-polymer rechargeable battery packs ? packages drawing code package name package tape reel land sot-23-5 mp005-a mp005-a mp005-a ? snt-6a pg006-a pg006-a pg006-a pg006-a
battery protection ic for 1-cell pack S-8211E series rev.1.0 _00 seiko instruments inc. 2 ? block diagram vm vss vdd co do overcharge detection comparator output control circuit divider control circuit overdischarge detection comparator oscillator control circuit remark all diodes shown in figure are parasitic diodes. figure 1
battery protection ic for 1-cell pack rev.1.0 _00 S-8211E series seiko instruments inc. 3 ? product name structure 1. product name (1) sot-23-5 S-8211E xx - m5t1 u package name (abbreviation) and ic packing specifications *1 m5t1 : sot-23-5, tape serial code *2 sequentially set from aa to zz *1. refer to the tape specifications. *2. refer to the ? 2. product name list ?. (2) snt-6a S-8211E xx - i6t1 g package name (abbreviation) and ic packing specifications *1 i6t1 : snt-6a, tape serial code *2 sequentially set from aa to zz *1. refer to the tape specifications. *2. refer to the ? 2. product name list ?.
battery protection ic for 1-cell pack S-8211E series rev.1.0 _00 seiko instruments inc. 4 2. product name list (1) sot-23-5 table 1 product name / item overcharge detection voltage [v cu ] overcharge release voltage [v cl ] over-discharge detection voltage [v dl ] over-discharge release voltage [v du ] delay time combination *1 S-8211Eac-m5t1u 3.600 v 3.600 v 2.00 v 2.00 v (1) *1. refer to the table 3 about the details of the dela y time combinations (1). remark please contact our sales office for the products wi th detection voltage value other than those specified above. (2) snt-6a table 2 product name / item overcharge detection voltage [v cu ] overcharge release voltage [v cl ] over-discharge detection voltage [v dl ] over-discharge release voltage [v du ] delay time combination *1 S-8211Eaa-i6t1g 4.220 v 4.220 v 2.00 v 2.00 v (2) S-8211Eab-i6t1g 4.270 v 4.270 v 2.00 v 2.00 v (2) S-8211Ead-i6t1g 4.220 v 4.220 v 2.50 v 2.50 v (2) S-8211Eae-i6t1g 4.220 v 4.220 v 2.30 v 2.30 v (2) *1. refer to the table 3 about the details of the dela y time combinations (2). remark please contact our sales office for the products wi th detection voltage value other than those specified above. table 3 delay time combination overcharge detection delay time [t cu ] overdischarge detection delay time [t dl ] (1) 1.2 s 150 ms (2) 573 ms 300 ms remark the delay times can be changed within the range listed table 4 . for details, please contact our sales office. table 4 delay time symbol selection range remark overcharge detection delay time t cu 143 ms 573 ms 1.2 s select a value from the left. overdischarge detection delay time t dl 38 ms 150 ms 300 ms select a value from the left. remark the value surrounded by bold lines is the delay time of the standard products.
battery protection ic for 1-cell pack rev.1.0 _00 S-8211E series seiko instruments inc. 5 ? pin configurations table 5 pin no. symbol description 1 vm negative power supply for co pin 2 vdd connection for positive power supply input 3 vss connection for negative power supply input 4 do connection for overdischarge detection output (cmos output) 5 co connection for overcharge detection output (cmos output) sot-23-5 top view 5 4 3 2 1 figure 2 table 6 pin no. symbol description 1 nc *1 no connection 2 co connection for overcharge detection output (cmos output) 3 do connection for overdischarge detection output (cmos output) snt-6a top view 1 2 3 4 6 5 4 vss connection for negative power supply input figure 3 5 vdd connection for positive power supply input 6 vm negative power supply for co pin *1. the nc pin is electrically open. the nc pin can be con nected to vdd or vss.
battery protection ic for 1-cell pack S-8211E series rev.1.0 _00 seiko instruments inc. 6 ? absolute maximum ratings table 7 (ta = 25 c unless otherwise specified) item symbol applied pin absolute maximum ratings unit input voltage between vdd pin and vss pin v ds vdd v ss ? 0.3 to v ss + 12 v vm pin input voltage v vm vm v dd ? 28 to v dd + 0.3 v do pin output voltage v do do v ss ? 0.3 to v dd + 0.3 v co pin output voltage v co co v vm ? 0.3 to v dd + 0.3 v sot-23-5 ? 600 *1 mw power dissipation snt-6a p d ? 400 *1 mw operating ambient temperature t opr ? ? 40 to + 85 c storage temperature t stg ? ? 55 to + 125 c *1. when mounted on board [mounted board] (1) board size: 114.3 mm 76.2 mm t1.6 mm (2) board name: jedec standard51-7 caution the absolute maximum ratings are rated values exceeding which the product could suffer physical damage. these values must therefore not be exceeded under any conditions. 0 50 100 150 700 400 0 power dissi p ation ( p d ) [ mw ] ambient tem p erature ( ta ) [ c ] 200 600 500 300 100 snt-6a sot-23-5 figure 4 power dissipation of package (when mounted on board)
battery protection ic for 1-cell pack rev.1.0 _00 S-8211E series seiko instruments inc. 7 ? electrical characteristics 1. except detection delay time (25 c) table 8 (ta = 25 c unless otherwise specified) item symbol condition min. typ. max. unit test condi- tion test circuit detection voltage 3.60 v to 4.40 v, adjustable v cu ? 0.025 v cu v cu + 0.025 v 1 1 overcharge detection voltage v cu 3.60 v to 4.40 v, adjustable, ta = ? 5 c to + 55 c *1 v cu ? 0.03 v cu v cu + 0.03 v 1 1 v cl v cu v cl ? 0.05 v cl v cl + 0.05 v 1 1 overcharge release voltage v cl 3.50 v to 4.40 v, adjustable v cl = v cu v cl ? 0.05 v cl v cl + 0.025 v 1 1 overdischarge detection voltage v dl 2.00 v to 3.00 v, adjustable v dl ? 0.05 v dl v dl + 0.05 v 2 2 v du v dl v du ? 0.10 v du v du + 0.10 v 2 2 overdischarge release voltage v du 2.00 v to 3.40 v, adjustable v du = v dl v du ? 0.05 v du v du + 0.05 v 2 2 input voltage operating voltage between vdd pin and vss pin v dsop1 ? 1.5 ? 8 v ? ? input current current consumption during operation i ope v dd = 3.5 v, v vm = 0 v 1.0 3.0 5.5 a 3 2 current consumption during overdischarge i oped v dd = 1.5 v, v vm = 0 v 0.3 2.0 3.5 a 3 2 output resistance co pin resistance ?h? r coh v co = 3.0 v, v dd = 3.5 v, v vm = 0 v 2.5 5 10 k ? 4 3 co pin resistance ?l? r col v co = 0.5 v, v dd = 4.5 v, v vm = 0 v 2.5 5 10 k ? 4 3 do pin resistance ?h? r doh v do = 3.0 v, v dd = 3.5 v, v vm = 0 v 2.5 5 10 k ? 5 3 do pin resistance ?l? r dol v do = 0.5 v, v dd = 1.8 v, v vm = 0 v 2.5 5 10 k ? 5 3 *1. since products are not screened at high a nd low temperature, the s pecification for this tem perature range is guaranteed by design, not tested in production.
battery protection ic for 1-cell pack S-8211E series rev.1.0 _00 seiko instruments inc. 8 2. except detection delay time ( ? 40c to + 85c *1 ) table 9 (ta = ? 40c to + 85c *1 unless otherwise specified) item symbol condition min. typ. max. unit test condi- tion test circuit detection voltage overcharge detection voltage v cu 3.60 v to 4.40 v, adjustable v cu ? 0.060 v cu v cu + 0.040 v 1 1 v cl v cu v cl ? 0.08 v cl v cl + 0.065 v 1 1 overcharge release voltage v cl 3.50 v to 4.40 v, adjustable v cl = v cu v cl ? 0.08 v cl v cl + 0.04 v 1 1 overdischarge detection voltage v dl 2.00 v to 3.00 v, adjustable v dl ? 0.11 v dl v dl + 0.13 v 2 2 v du v dl v du ? 0.15 v du v du + 0.19 v 2 2 overdischarge release voltage v du 2.00 v to 3.40 v, adjustable v du = v dl v du ? 0.11 v du v du + 0.13 v 2 2 input voltage operating voltage betw een vdd pin and vss pin v dsop1 ? 1.5 ? 8 v ? ? input current current consumption during operation i ope v dd = 3.5 v, v vm = 0 v 0.7 3.0 6.0 a 3 2 current consumption during overdischarge i oped v dd = 1.5 v, v vm = 0 v 0.2 2.0 3.8 a 3 2 output resistance co pin resistance ?h? r coh v co = 3.0 v, v dd = 3.5 v, v vm = 0 v 1.2 5 15 k ? 4 3 co pin resistance ?l? r col v co = 0.5 v, v dd = 4.5 v, v vm = 0 v 1.2 5 15 k ? 4 3 do pin resistance ?h? r doh v do = 3.0 v, v dd = 3.5 v, v vm = 0 v 1.2 5 15 k ? 5 3 do pin resistance ?l? r dol v do = 0.5 v, v dd = 1.8 v, v vm = 0 v 1.2 5 15 k ? 5 3 *1. since products are not screened at high a nd low temperature, the s pecification for this tem perature range is guaranteed by design, not tested in production.
battery protection ic for 1-cell pack rev.1.0 _00 S-8211E series seiko instruments inc. 9 3. detection delay time (1) S-8211Eac table 10 item symbol condition min. typ. max. unit test condi- tion test circuit delay time (ta = 25c) overcharge detection delay time t cu ? 0.96 1.2 1.4 s 6 4 overdischarge detection delay time t dl ? 120 150 180 ms 6 4 delay time (ta = ? 40c to + 85c) *1 overcharge detection delay time t cu ? 0.7 1.2 2.0 s 6 4 overdischarge detection delay time t dl ? 83 150 255 ms 6 4 *1. since products are not screened at high a nd low temperature, the s pecification for this tem perature range is guaranteed by design, not tested in production. (2) S-8211Eaa, S-8211Eab, S-8211Ead, S-8211Eae table 11 item symbol condition min. typ. max. unit test condi- tion test circuit delay time (ta = 25c) overcharge detection delay time t cu ? 458 573 687 ms 6 4 overdischarge detection delay time t dl ? 240 300 360 ms 6 4 delay time (ta = ? 40c to + 85c) *1 overcharge detection delay time t cu ? 334 573 955 ms 6 4 overdischarge detection delay time t dl ? 166 300 510 ms 6 4 *1. since products are not screened at high a nd low temperature, the s pecification for this tem perature range is guaranteed by design, not tested in production.
battery protection ic for 1-cell pack S-8211E series rev.1.0 _00 seiko instruments inc. 10 ? test circuits caution unless otherwise specified, the output voltage levels ?h? and ?l? at co pin (v co ) and do pin (v do ) are judged by the threshold voltage (1.0 v) of the n-channel fet. judge the co pin level with respect to v vm and the do pin level with respect to v ss . (1) overcharge detection voltage, overcharge release voltage (test condition 1, test circuit 1) overcharge detection voltage (v cu ) is defined as the voltage between the 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. overcharge release voltage (v cl ) is defined as the volt age between the vdd pin and vss pin at which v co goes from ?l? to ?h? when the voltage v1 is then gradually decr eased. overcharge hysteresis voltage (v hc ) is defined as the difference between overcharge detection voltage (v cu ) and overcharge release voltage (v cl ). (2) overdischarge detection voltage, overdischarge release voltage (test condition 2, test circuit 2) overdischarge detection voltage (v dl ) is defined as the voltage between the vdd pin and vss pin at which v do goes from ?h? to ?l? when the voltage v1 is gradually decreased fr om the starting condition of v1 = 3.5 v, v2 = 0 v. overdischarge release voltage (v du ) is defined as the volt age between the vdd pin and vss pin at which v do goes from ?l? to ?h? when the voltage v1 is then gradual ly increased. overdischarge hysteresis voltage (v hd ) is defined as the difference between overdischarge release voltage (v du ) and overdischarge detection voltage (v dl ). (3) operating current consumption (test condition 3, test circuit 2) the operating current consumption (i ope ) is the current that flows through the vdd pin (i dd ) under the set conditions of v1 = 3.5 v and v2 = 0 v (normal status). (4) overdischarge current consumption (test condition 3, test circuit 2) the overdischarge current consumption (i oped ) is the current that fl ows through the vdd pin (i dd ) under the set conditions of v1 = 1.5 v, v2 = 0v (overdischarge status). (5) co pin resistance ?h? (test condition 4, test circuit 3) the co pin resistance ?h? (r coh ) is the resistance at the co pin under t he set conditions of v1 = 3.5 v, v2 = 0 v, v3 = 3.0 v. (6) co pin resistance ?l? (test condition 4, test circuit 3) the co pin resistance ?l? (r col ) is the resistance at the co pin under t he set conditions of v1 = 4.5 v, v2 = 0 v, v3 = 0.5 v. (7) do pin resistance ?h? (test condition 5, test circuit 3) the do pin h resistance (r doh ) is the resistance at the do pin under th e set conditions of v1 = 3.5 v, v2 = 0 v, v4 = 3.0 v. (8) do pin resistance ?l? (test condition 5, test circuit 3) the do pin l resistance (r dol ) is the resistance at the do pin under the set conditions of v1 = 1.8 v, v2 = 0 v, v4 = 0.5 v.
battery protection ic for 1-cell pack rev.1.0 _00 S-8211E series seiko instruments inc. 11 (9) overcharge detection delay time (test condition 6, test circuit 4) the overcharge detection delay time (t cu ) is the time needed for v co to change from ?h? to ?l? just after the voltage v1 momentarily increases (within 10 s) from overcharge detection voltage (v cu ) ? 0.2 v to overcharge detection voltage (v cu ) + 0.2 v under the set conditions of v2 = 0 v. (10) overdischarge detection delay time (test condition 6, test circuit 4) the overdischarge detection delay time (t dl ) is the time needed for v do to change from ?h? to ?l? just after the voltage v1 momentarily decreases (within 10 s) from overdischarge detection voltage (v dl ) + 0.2 v to overdischarge detection voltage (v dl ) ? 0.2 v under the set condition of v2 = 0 v. v v do v v co co do vss vdd vm S-8211E series r1 = 220 ? v1 com v v do v v co co do vss vdd vm S-8211E series v1 v2 com a i dd figure 5 test circuit 1 figure 6 test circuit 2 a i do a i co co do vss vdd vm S-8211E series v1 v2 com v4 v3 co do vss vdd vm S-8211E series v1 v2 com oscilloscope oscilloscope figure 7 test circuit 3 figure 8 test circuit 4
battery protection ic for 1-cell pack S-8211E series rev.1.0 _00 seiko instruments inc. 12 ? operation remark refer to the ? ? battery protection ic connection example ?. 1. normal status this ic monitors the voltage of the battery connected between the vdd pin and the vss pi n. the co pin and the do pin output the vdd voltage when the battery vo ltage is overdischarge detection voltage (v dl ) or more and overcharge detection voltage (v cu ) or less. this is the normal status. 2. overcharge status when the battery voltage in the normal status exceeds the overcharge detection voltage (v cu ) during charge, and this status is held for the over charge detection delay time (t cu ) or more, the co pin outputs the vss potential. this is the overcharge status. this overcharge status is released when the battery voltage decreases to the overcharge release voltage (v cl ) or less. 3. overdischarge status when the battery voltage in the normal status decreases than the overc harge detection voltage (v dl ) during discharge, and this status is held for the overdischarge detection delay time (t dl ) or more, the do pin outputs the vss potential. this is the overdischarge status. this overdischarge status is released when the battery voltage increases to the overdischarge release voltage (v du ) or more. 4. delay circuit the detection delay times are determined by dividing a clock of approximately 3.5 khz by the counter.
battery protection ic for 1-cell pack rev.1.0 _00 S-8211E series seiko instruments inc. 13 ? timing chart (1) overcharge detection, overdischarge detection v cu v du v dl v cl battery voltage co pin voltage v dd do pin voltage v ss status *1 overcharge detecti on delay time (t cu ) (1) (2) (1) (3) (1) v ss v dd overdischarge detecti on delay time (t dl ) *1. (1) : normal status (2) : overcharge status (3) : overdischarge status figure 9
battery protection ic for 1-cell pack S-8211E series rev.1.0 _00 seiko instruments inc. 14 ? battery protection ic connection example r1 battery c1 vss do vdd co vm S-8211E series co do r2 figure 10 table 13 constants for external components symbol part purpose typ. min. max. remark r1 resistor esd protection, for power fluctuation 220 ? 100 ? 330 ? resistance should be as small as possible to avoid lowering the overcharge detection accuracy due to current consumption. *1 c1 capacitor for power fluctuation 0.1 f 0.022 f 1.0 f connect a capacitor of 0.022 f or higher between vdd pin and vss pin. *2 r2 * 3 resistor esd protection 1 k ? 300 ? 4 k ? - *1. insert a resistor of 100 ? or higher as r1 for esd protection. *2. if a capacitor of less than 0.022 f is connected to c1, do pin may oscillate. be sure to connect a capacitor of 0.022 f or higher to c1. *3. be sure to using r2, connect the vm pin with the vss pin. caution 1. the above constants may be changed without notice. 2. it has not been confirmed whether the operation is normal or not in circuits other than the above example of connection. in additi on, the example of connection show n above and the constant do not guarantee proper operation. perform thorough evaluation using the actual application to set the constant.
battery protection ic for 1-cell pack rev.1.0 _00 S-8211E series seiko instruments inc. 15 ? application circuit examples 1. protection circuits series multi-cells r2 r2 r2 r2 r1 battery c1 vss do vdd co vm S-8211E series co do r1 battery c1 vss do vdd co vm S-8211E series co do r1 battery c1 vss do vdd co vm S-8211E series co do r1 battery c1 vss do vdd co vm S-8211E series co do figure 11
battery protection ic for 1-cell pack S-8211E series rev.1.0 _00 seiko instruments inc. 16 2. charge cell-balance detection circuit r2 r2 r2 r2 r1 battery c1 vss do vdd co vm S-8211E series r1 battery c1 vss do vdd co vm S-8211E series r1 battery c1 vss do vdd co vm S-8211E series r1 battery c1 vss do vdd co vm S-8211E series protection ic eb ? eb + figure 12
battery protection ic for 1-cell pack rev.1.0 _00 S-8211E series seiko instruments inc. 17 ? precautions ? the application conditions for the i nput voltage, output voltage, and load curre nt should not exceed the package power dissipation. ? be sure to using r2, connect the vm pin with the vss pin. ? do not apply an electrostatic discharge to this ic that ex ceeds the performance ratings of the built-in electrostatic protection circuit. ? sii claims no responsibility for any and all disputes arisi ng out of or in connection with any infringement by products including this ic of patents owned by a third party.
battery protection ic for 1-cell pack S-8211E series rev.1.0 _00 seiko instruments inc. 18 ? characteristics (typical data) 1. current consumption (1) i ope vs. ta (2) i oped vs. ta ? 40 ? 25 0 25 50 75 85 6 5 4 3 2 1 0 ta [ c] i ope [ a] ? 40 ? 25 0 25 50 75 85 4 3 2 1 0 ta [ c] i oped [ a] (3) i ope vs. v dd 0 2 4 6 v dd [v] 6 5 4 3 2 1 0 i ope [ a] 8 2. overcharge detection / release voltage, overdi scharge detection / release voltage, overcurrent detection voltage, and delay time (1) v cu vs. ta (2) v cl vs. ta ? 40 ? 25 0 25 50 75 85 ta [ c] 4.350 4.345 4.340 4.335 4.330 4.325 4.300 v cu [v] 4.320 4.315 4.310 4.305 ? 40 ? 25 0 25 50 75 85 ta [ c] 4.125 4.115 4.105 4.095 4.085 4.075 4.025 v cl [v] 4.065 4.055 4.045 4.035 (3) v du vs. ta (4) v dl vs. ta ? 40 ? 25 0 25 50 75 85 ta [ c] 2.95 2.94 2.93 2.92 2.91 2.90 2.85 v du [v] 2.89 2.88 2.87 2.86 ? 40 ? 25 0 25 50 75 85 ta [ c] 2.60 2.58 2.56 2.54 2.52 2.50 2.40 v dl [v] 2.48 2.46 2.44 2.42
battery protection ic for 1-cell pack rev.1.0 _00 S-8211E series seiko instruments inc. 19 (5) t cu vs. ta (6) t dl vs. ta ? 40 ? 25 0 25 50 7585 ta [ c] 1.50 1.45 1.40 1.35 1.30 1.25 1.00 t cu [s] 1.20 1.15 1.10 1.05 ? 40 ? 25 0 25 50 7585 ta [ c] 200 190 180 170 160 150 100 t dl [ms] 140 130 120 110 3. co pin / do pin (1) i coh vs. v co (2) i col vs. v co 0 ? 0.1 ? 0.2 ? 0.5 i coh [ma] ? 0.3 ? 0.4 0 1 2 3 4 v co [v] 0.5 0.4 0.3 0 i col [ma] 0.2 0.1 0 1 2 3 4 v co [v] (3) i doh vs. v do (4) i dol vs. v do 0 1 2 3 4 v do [v] 0 ? 0.05 ? 0.10 ? 0.15 ? 0.30 i doh [ma] ? 0.20 ? 0.25 0 0.5 1.0 1.5 v do [v] 0.20 0.15 0.10 0 i dol [ma] 0.05
battery protection ic for 1-cell pack S-8211E series rev.1.0 _00 seiko instruments inc. 20 ? marking specifications (1) sot-23-5 (1) to (3): product code (refer to product name vs. product code ) (4) : lot number 1 sot-23-5 to p view 2 3 4 (1) (2) (3) (4) 5 product name vs. product code product code product name (1) (2) (3) S-8211Eac-m5t1u r 3 c remark please contact our sales office for the products other than t hose specified above. (2) snt-6a (1) to (3): product code (refer to product name vs. product code ) (4) to (6): lot number snt-6a to p view 1 2 3 4 6 5 (1) (4) (2) (5) (3) (6) product name vs. product code product code product name (1) (2) (3) S-8211Eaa-i6t1g r 3 a S-8211Eab-i6t1g r 3 b S-8211Ead-i6t1g r 3 d S-8211Eae-i6t1g r 3 e remark please contact our sales office for the products other than t hose specified above.

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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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