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low voltage detector r3111x series no. ea-056-070403 1 outline the r3111 series are cmos-based voltage detector ics with high detector threshold accuracy and ultra-low supply current, which can be operated at an extremely low voltage and is used for system reset as an example. each of these ics consists of a voltage reference unit, a comparator, resistors for detector threshold setting, an output driver and a hysteresis circuit. the detector threshold is fixed with high accuracy internally and does not require any adjustment. three output types, nch open drain type and cmos type are available. the r3111 series are operable at a lower voltage than that for the rx5vl series, and can be driven by a single battery. six types of packages, to-92, sot-89, sot-23-3, sot-23-5, sc-82ab, and son1612-6 are available. features ? ultra-low supply current ...................................................... typ. 0.8 a (v dd = 1.5v) ? wide range of operating voltage........................................ 0.7v to 10.0v (topt = 25 c) ? detector threshold ............................................................... stepwise setting with a step of 0.1v in the ra nge of 0.9v to 6.0v is possible. ? high accuracy detector threshold....................................... 2.0% ? low temperature-drift coefficient of detector threshold .... typ. 100ppm/ c ? two output types ................................................................ nch open drain and cmos ? six types of packages ......................................................... to-92, sot-89(mini-power mold), sot-23-3, sot-23-5 (mini-mold), sc-82ab, son1612-6 applications ? cpu and logic circuit reset ? battery checker ? window comparator ? wave shaping circuit ? battery back-up circuit ? power failure detector
r3111x 2 block diagrams r3111xxxxa r3111xxxxc v dd out gnd vref v dd out gnd vref r3111xxxxb timing chart r3111xxx1a/c t plh supply voltage output voltage (out) minimum operating voltage v ss v ss detector threshold hysteresis (v dd ) release voltage +v det detector threshold -v det v v v v dd dd dd dd vref vref vref vref out out out out gnd gnd gnd gnd + -
r3111x 3 r3111xxx1b definition of output delay time output delay time t plh /t phl is defined as follows: 1. in the case of nch open drain output:(r3111xxxxa/b) under the condition of the output pin (out) is pulled up through a resistor of 470k ? to 5v, the time interval between the rising edge of v dd pulse from 0.7v to ( + v det ) + 2.0v and becoming of the output voltage to 2.5v. 2. in the case of cmos output:(r3111xxxxc) the time interval between the rising edge of v dd pulse from 0.7v to ( + v det ) + 2.0v and becoming of the output voltage to (v dd / 2) v. +v det + 2.0v 5.0v 2.5v 0.7v input voltage (v dd ) output voltage gnd gnd t phl t plh +v det + 2.0v +v det +2.0v +v det +2.0v 0.7v input voltage (v dd ) output voltage gnd 2 gnd t phl t plh nch open drain output(r3111xxxxa) cmos output(r3111xxxxc) minimum operating voltage (v ddl ) gnd output voltage (v out ) power supply (v dd ) hysteresis(v hys ) released voltage (+v det ) detector threshold (-v det ) a b t plh gnd pull-up voltage
r3111x 4 nch open drain output (r3111xxxxb) selection guide the package type, the detector threshold, the output type and the taping type of r3111 series can be designated at the users? request by specifying the part number as follows; r3111xxx xx-xx part number a b c d e code descriptions a designation of package type; e: to-92 q: sc-82ab h: sot-89 n: sot-23-5 / sot-23-3 d: son1612-6 b setting detector threshold ( ? v det ); stepwise setting with a step of 0.1v in the range of 0.9v to 6.0v is possible. c designation of package type 1: except sot-23-3 2: sot-23-3 d designation of output type; a: nch open drain(output "l" at v dd =-vdet) b: nch open drain(output "h" at v dd =-vdet) c: cmos (output "l" at v dd =-vdet) e designation of packing or taping type; ex.to-92: tz, sot-89: t1, sot-23-3, sot-23-5, sc-82ab, son1612-6: tr prescribed as standard directions. (refer to taping specifications.) antistatic bag for samples: c +v det +2.0v 0.7v gnd 5.0v 2.5v gn output voltage input voltage (v dd ) tp lh tp hl
r3111x 5 pin configuration to-92 sot-89 sot-23-3 sot-23-5 sc-82ab son1612-6 123 (mark side) 123 (mark side) 12 3 (mark side) 123 54 (mark side) 43 12 (mark side) 123 654 pin description to-92 sot-89 sot-23-3 sot-23-5 sc-82ab pin no. symbol pin no. symbol pin no. symbol pin no. symbol pin no. symbol 1 v dd 1 out 1 out 1 out 1 out 2 gnd 2 v dd 2 gnd 2 v dd 2 v dd 3 out 3 gnd 3 v dd 3 gnd 3 nc 4 nc 4 gnd 5 nc son1612-6 pin no. symbol 1 out 2 v dd 3 gnd 4 nc 5 v dd 6 nc
r3111x 6 absolute maximum ratings symbol item rating unit v dd supply voltage 12 v v out1 output voltage (cmos) v ss ? 0.3 to v dd + 0.3 v v out2 output voltage (nch) v ss ? 0.3 to 12 v i out output current 70 ma p d power dissipation 1 ? note1 300 mw p d power dissipation 2 ? note2 150 mw p d power dissipation 3 ? note3 500 mw topt operating temperature range ? 40 to 85 c tstg storage temperature range ? 55 to 125 c tsolder lead temperature (soldering) 260 c, 10s ? note 1: applied to sot-89 and to-92 single suspended in the air ? note 2: applied to sot-23-3, sot-23-5 and sc-82ab single suspended in the air ? note 3: applied to son1612-6 at mounted on board p d depends on conditions of mounting on board. this specification is based on the measurement at the condition below: ? measurement conditions environment: mounted on board (wind velocity 0m/s) board material: fr-4 (2-layer) board dimensions : 40mm x 40mm x t1.6mm copper area: 50% electrical characteristics r3111x09xa/c topt = 25 c symbol item conditions min. typ. max. unit ? v det detector threshold 0.882 0.900 0.918 v v hys detector threshold hysteresis 0.027 0.045 0.063 v i ss supply current v dd = 0.80v 2.90v 0.8 0.9 2.4 2.7 a v ddh maximum operating voltage 10 v topt = 25 c 0.55 0.70 v ddl minimum operating voltage ? note1 ? 40 c < = topt < = 85 c 0.65 0.80 v nch v ds = 0.05v, v dd = 0.70v v ds = 0.50v, v dd = 0.85v 0.01 0.05 0.05 0.50 ma i out output current (driver output pin) pch v ds =? 2.1v,v dd = 4.5v 1.0 2.0 ma t plh output delay time ? note2 100 s ?? v det / ? t detector threshold temperature coefficient ? 40 c < = topt < = 85 c 100 ppm/ c
r3111x 7 r3111x18xa/c topt = 25 c symbol item conditions min. typ. max. u = = = = nit ? v det detector threshold 1.764 1.800 1.836 v v hys detector threshold hysteresis 0.054 0.090 0.126 v i ss supply current v dd = 1.70v 3.80v 0.8 1.0 2.4 3.0 a v ddh maximum operating voltage 10 v topt = 25 c 0.55 0.70 v ddl minimum operating voltage ? note1 ? 40 c < = topt < = 85 c 0.65 0.80 v nch v ds = 0.05v, v dd = 0.70v v ds = 0.50v, v dd = 0.85v 0.01 1.00 0.05 2.00 ma i out output current (driver output pin) pch v ds =? 2.1v, v dd = 4.5v 1.0 2.0 ma t plh output delay time ? note2 100 s ?? v det / ? t detector threshold temperature coefficient ? 40 c < = topt < = 85 c 100 ppm/ c r3111x27xa/c topt = 25 c symbol item conditions min. typ. max. unit ? v det detector threshold 2.646 2.700 2.754 v v hys detector threshold hysteresis 0.081 0.135 0.189 v i ss supply current v dd = 2.60v 4.70v 0.9 1.1 2.7 3.3 a v ddh maximum operating voltage 10 v topt = 25 c 0.55 0.70 v ddl minimum operating voltage ? note1 ? 40 c < = topt < = 85 c 0.65 0.80 v nch v ds = 0.05v, v dd = 0.70v v ds = 0.50v,v dd = 1.50v 0.01 1.00 0.05 2.00 ma i out output current (driver output pin) pch v ds =? 2.1v, v dd = 4.5v 1.0 2.0 ma t plh output delay time ? note2 100 s ?? v det / ? t detector threshold temperature coefficient ? 40 c < = topt < = 85 c 100 ppm/ c
r3111x 8 r3111x36xa/c topt = 25 c symbol item conditions min. typ. max. unit ? v det detector threshold 3.528 3.600 3.672 v v hys detector threshold hysteresis 0.108 0.180 0.252 v i ss supply current v dd = 3.47v 5.60v 1.0 1.2 3.0 3.6 a v ddh maximum operating voltage 10 v topt = 25 c 0.55 0.70 v ddl minimum operating voltage ? note1 ? 40 c < = topt < = 85 c 0.65 0.80 v nch v ds = 0.05v, v dd = 0.70v v ds = 0.50v, v dd = 1.50v 0.01 1.00 0.05 2.00 ma i out output current (driver output pin) pch v ds =? 2.1v, v dd = 4.5v 1.0 2.0 ma t plh output delay time ? note2 100 s ?? v det / ? t detector threshold temperature coefficient ? 40 c < = topt < = 85 c 100 ppm/ c r3111x45xa/c topt = 25 c symbol item conditions min. typ. max. unit ? v det detector threshold 4.410 4.500 4.590 v v hys detector threshold hysteresis 0.135 0.225 0.315 v i ss supply current v dd = 4.34v 6.50v 1.1 1.3 3.3 3.9 a v ddh maximum operating voltage 10 v topt = 25 c 0.55 0.70 v ddl minimum operating voltage ? note1 ? 40 c < = topt < = 85 c 0.65 0.80 v nch v ds = 0.05v, v dd = 0.70v v ds = 0.50v, v dd = 1.50v 0.01 1.00 0.05 2.00 ma i out output current (driver output pin) pch v ds =? 2.1v, v dd = 8.0v 1.5 3.0 ma t plh output delay time ? note2 100 s ?? v det / ? t detector threshold temperature coefficient ? 40 c < = topt < = 85 c 100 ppm/ c
r3111x 9 r3111x54xa/c topt = 25 c symbol item conditions min. typ. max. unit ? v det detector threshold 5.292 5.400 5.508 v v hys detector threshold hysteresis 0.162 0.270 0.378 v i ss supply current v dd = 5.20v 7.40v 1.2 1.4 3.6 4.2 a v ddh maximum operating voltage 10 v topt = 25 c 0.55 0.70 v ddl minimum operating voltage ? note1 ? 40 c < = topt < = 85 c 0.65 0.80 v nch v ds = 0.05v, v dd = 0.70v v ds = 0.50v, v dd = 1.50v 0.01 1.00 0.05 2.00 ma i out output current (driver output pin) pch v ds =? 2.1v, v dd = 8.0v 1.5 3.0 ma t plh output delay time ? note2 100 s ?? v det / ? t detector threshold temperature coefficient ? 40 c < = topt < = 85 c 100 ppm/ c ? note1: minimum operating voltage means the value of input voltage when output voltage maintains 0.1v or less. (in the case of nch open drain output type, the output pin is pulled up with a resistance of 470k ? to 5.0v.) ? note2: in the case of cmos output type: the time interval between the rising edge of v dd input pulse from 0.7v to ( + v det ) + 2.0v and output voltage level becoming to v dd /2. in the case of nch open drain output type: the output pin is pulled up with a resistance of 470k ? to 5.0v, the time interval between the rising edge of v dd input pulse from 0.7v to ( + v det ) + 2.0v and output voltage level becoming to 2.5v. r3111q231b topt = 25 c symbol item conditions min. typ. max. unit ? v det detector threshold 2.254 2.300 2.346 v v hys detector threshold hysteresis 0.069 0.115 0.161 v i ss supply current v dd = 2.20v 4.30v 0.9 1.1 2.7 3.3 a v ddh maximum operating voltage 10 v topt = 25 c 0.55 0.70 v ddl minimum operating voltage ? note1 ? 40 c < = topt < = 85 c 0.65 0.80 v i out output current (driver output pin) nch v ds = 0.50v,v dd = 3.00v 10 ma plh output delay time ? note2 100 s ?? v det / ? t detector threshold temperature coefficient ? 40 c < = topt < = 85 c 100 ppm/ c
r3111x 10 r3111q441b topt = 25 c symbol item conditions min. typ. max. unit ? v det detector threshold 4.312 4.400 4.488 v v hys detector threshold hysteresis 0.132 0.220 0.308 v i ss supply current v dd = 4.24v 6.40v 1.1 1.3 3.3 3.9 a v ddh maximum operating voltage 10 v topt = 25 c 0.55 0.70 v ddl minimum operating voltage ? note1 ? 40 c < = topt < = 85 c 0.65 0.80 v i out output current (driver output pin) nch v ds = 0.50v, v dd =5 .50v 18 ma t plh output delay time ? note2 100 s ?? v det / ? t detector threshold temperature coefficient ? 40 c < = topt < = 85 c 100 ppm/ c ? note1: minimum operating voltage means the value of input voltage when output voltage maintains 0.1v or less. (in the case of nch open drain output type, the output pin is pulled up with a resistance of 470k ? to 5.0v.) ? note2: in the case of cmos output type: the time interval between the rising edge of v dd input pulse from 0.7v to ( + v det ) + 2.0v and output voltage level becoming to v dd /2. in the case of nch open drain output type: the output pin is pulled up with a resistance of 470k ? to 5.0v, the time interval between the rising edge of v dd input pulse from 0.7v to ( + v det ) + 2.0v and output voltage level becoming to 2.5v. operation v dd out gnd vref ra rb rc pch nch comparator figure 1. block diagram (r3111xxxxc)
r3111x 11 t plh supply voltage (v dd ) output voltage (v out ) released voltage(+v det ) detector threshold(-v det ) detector threshold hysteresis 12 3 4 5 a b minimum operating voltage gnd gnd step 1 2 3 4 5 comparator pin input voltage i ii iii iv v comparator output h l inde-finite l h tr.1 off on inde-finite on off pch on off inde-finite off on output tr. nch off on inde-finite on off rb + rc i. ra + rb + rc v dd rb ii. ra + rb v dd figure 2. operation diagram step 1. the output voltage is equal to the supply voltage (v dd ). step 2. at point ?a?, vref > = v dd (rb + rc)/(ra + rb + rc) is true, as a result, the output of comparator is reverse, and output voltage becomes to gnd level. the voltage level of point a means detector threshold voltage, or ( ? v det ). step 3. when the supply voltage is less than minimum operating voltage, the operation of output transistor becomes indefinite, and in the case that output is pulled up to v dd , the output voltage equals to v dd voltage. step 4. the output voltage equals to gnd level. step 5. at point ?b?, vref > = v dd rb/(ra + rb) is true, output of the comparator is reverse, and output voltage is equal to the supply voltage, or (v dd ). the voltage level of point b means released voltage, or ( + v det ). ? the difference between released voltage and detector threshold voltage is the detector threshold hysteresis. vref v dd gnd out + - ra rb rc comparator n ch ? ? out pin should be pulled up to vdd or another voltage source. figure 3. block diagram (r3111xxxxb)
r3111x 12 minimum operating vo l t a g e ( v ddl ) gnd output voltage (v out ) supply vo l t a g e (v dd ) hysteresis range (v hys ) released voltage (+v det ) detector threshold (-v det ) a b t plh gnd pull-up voltage step 1 2 3 comparator pin input voltage i ii iii comparator output h l h tr.1 off on off output tr. nch on off on rb + rc i. ra + rb + rc v dd rb ii. ra + rb v dd figure 4. operation diagram step 1. the output voltage is equal to the supply voltage (v dd ). step 2. at point ?a?, vref > = v dd (rb + rc)/(ra + rb + rc) is true, as a result, the output of comparator is reverse, and output voltage becomes to pull-up level. the voltage level of point a means detector threshold voltage, or ( ? v det ). step 3. at point ?b?, vref > = v dd rb/(ra + rb) is true, output of the comparator is reverse, and output voltage is equal to the gnd after tphl. the voltage level of point b means released voltage, or ( + v det ). ? the difference between released voltage and detector threshold voltage is the detector threshold hysteresis. test circuits i ss v dd out gnd v in r3111 x series r3111 x series v dd v out 5.0v out gnd v in 470k pull-up circuit is not necessary for cmos output type, or r3111xxxxc. supply current test circuit detector threshold test circuit v dd v ds out i out gnd v in r3111 x series r3111 x series v dd v dd- v ds v ds out i out gnd v in ? apply to cmos output type only
r3111x 13 nch driver output current test circuit pch driver output current test circuit v dd v ss v ss out out gnd p.g. r3111 xxxx a series 470k c out +5.0v 0.7v r out +v det +2.0v out p. g . v dd v ss v ss out gnd r3111 xxxx a series 470k 100k c in +5.0v 0.7v r out r in +v det +2.0v output delay time test circuit (1) output delay time test circuit (2) typical characteristics 1) supply current vs. input voltage r3111x09xc r3111x27xc topt=85 c 25 c -40 c 2.5 2.0 1.5 1.0 0.5 0.0 input voltage v in (v) 0246810 supply current i ss ( a) topt=85 c 25 c -40 c 2.0 1.5 1.0 0.5 0.0 input voltage v in (v) 0246810 supply current i ss ( a)
r3111x 14 r3111x45xc topt=85 c 25 c -40 c 2.0 1.5 1.0 0.5 0.0 input voltage v in (v) 0246810 supply current i ss ( a) 2) detector threshold hysteresis vs. temperature r3111x09xc r3111x27xc +v det -v det 1.00 0.98 0.96 0.94 0.92 0.90 0.88 0.84 0.86 temperature topt( c) -60 0 20 40 60 80 -40 -20 100 detector threshold -v det (v) 2.9 2.8 2.7 2.6 2.5 +v det -v det temperature topt( c) -60 0 20 40 60 80 -40 -20 100 detector threshold -v det (v) r3111x45xc 4.8 4.7 4.6 4.5 4.4 +v det -v det temperature topt( c) -60 0 20 40 60 80 -40 -20 100 detector threshold -v det (v)
r3111x 15 3) output voltage vs. input voltage r3111x09xc r3111x09xa topt=-40 c 25 c 85 c 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.0 0.2 input voltage v in (v) 0 0.6 0.8 1 1.2 1.4 0.2 0.4 1.6 output voltage v out (v) 5v pull-up 470k ? 6 5 4 3 2 0 1 input voltage v in (v) 0 0.6 0.8 1 1.2 1.4 0.2 0.4 1.6 output voltage v out (v) topt=-40 c 25 c 85 c r3111x27xc r3111x27xa topt=-40 c 25 c 85 c 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.0 0.5 input voltage v in (v) 0 1.5 2 2.5 3 3.5 0.5 1 4 output voltage v out (v) 5v pull-up 470k ? 6 5 4 3 2 0 1 input voltage v in (v) 0 1.5 2 2.5 3 3.5 0.5 1 4 output voltage v out (v) topt=-40 c 25 c 85 c r3111x45xc r3111x45xa topt=-40 c 25 c 85 c 6 5 4 3 2 0 1 input voltage v in (v) 023 16 5 4 output voltage v out (v) 5v pull-up 470k ? 6 5 4 3 2 0 1 input voltage v in (v) 023 16 5 4 output voltage v out (v) topt=-40 c 25 c 85 c
r3111x 16 4) nch driver output current vs. v ds r3111x09xc r3111x09xc topt=25 c v dd =0.85v 0.7v 700 600 500 400 300 200 0 100 v ds (v) 0 0.2 0.4 0.6 0.8 output current i out ( a) v dd =0.8v 0.7v topt=25 c 300 250 200 150 100 0 50 v ds (v) 0 0.02 0.04 0.06 0.08 0.1 output current i out ( a) r3111x27xc r3111x27xc topt=25 c v dd =2.5v 2.0v 1.5v 20 18 14 16 12 10 8 6 4 0 2 v ds (v) 0 0.5 1 1.5 2 2.5 output current i out (ma) v dd =0.8v 0.7v topt=25 c 300 250 200 150 100 0 50 v ds (v) 0 0.02 0.04 0.06 0.08 0.1 output current i out ( a) r3111x45xc r3111x45xc topt=25 c v dd =4.5v 4.0v 3.5v 3.0v 2.5v 2.0v 1.5v 60 50 40 30 20 0 10 v ds (v) 0 0.5 1 1.5 2 2.5 3 4 3.5 4.5 output current i out (ma) v dd =0.8v 0.7v topt=25 c 300 250 200 150 100 0 50 v ds (v) 0 0.02 0.04 0.06 0.08 0.1 output current i out ( a)
r3111x 17 5) nch driver output current vs. input voltage r3111x09xc r3111x27xc 900 800 700 600 500 400 300 200 0 100 input voltage v in (v) 0 0.2 0.4 0.6 1 0.8 output current i out (ma) topt=-85 c 25 c -40 c 14 12 10 8 6 4 0 2 input voltage v in (v) 0 0.5 1 1.5 1 2.5 3 output current i out (ma) topt=-40 c 25 c 85 c r3111x45xc 25 20 15 10 5 0 input voltage v in (v) 0123456 output current i out (ma) topt=-40 c 25 c 85 c 6) pch driver output current vs. input voltage r3111x09xc r3111x27xc topt=25 c v ds =0.7v 0.5v 1.4 1.2 1.0 0.8 0.6 0.4 0.0 0.2 input voltage v in (v) 02468 output current i out (ma) topt=25 c v ds =2.1v 1.5v 0.5v 1.0v 3.5 3.0 2.5 2.0 1.5 1.0 0.0 0.5 input voltage v in (v) 012 4 36 57 output current i out (ma)
r3111x 18 r3111x45xc topt=25 c v ds =2.1v 1.5v 0.5v 1.0v 4.5 3.5 4.0 3.0 2.5 2.0 1.5 1.0 0.0 0.5 input voltage v in (v) 024 8 610 output current i out (ma) 7) output delay time vs. load capacitance r3111x09xa r3111x27xa tplh tphl 100 10 1 0.1 0.01 0.001 load capacitance c out ( f) 0.0001 0.01 0.001 0.1 output delay time tp(ms) tplh tphl 100 10 1 0.1 0.01 0.001 load capacitance c out ( f) 0.0001 0.01 0.001 0.1 output delay time tp(ms) r3111x45xa t plh t phl 100 10 1 0.1 0.01 0.001 load capacitance c out ( f) 0.0001 0.01 0.001 0.1 output delay time tp(ms)
r3111x 19 8) output delay time vs. input pin capacitance r3111x09xa r3111x27xa t phl t plh 100 10 1 0.1 0.01 0.001 input pin capacitance c in ( f) 0.0001 0.01 0.001 0.1 output delay time tp(ms) t plh t phl 100 10 1 0.1 0.01 0.001 input load capacitance c in ( f) 0.0001 0.01 0.001 0.1 output delay time tp(ms) r3111x45xa t plh t phl 100 10 1 0.1 0.01 0.001 input pin capacitance c in ( f) 0.001 0.1 0.01 1 output delay time tp(ms) typical applications r3111xxxxa cpu reset circuit (nch open drain output) case 1. input voltage to r3111xxxxa is equal to input voltage to cpu case 2. input voltage to r3111xxxxa is unequal to input voltage to cpu v dd v dd v dd out gnd gnd r3111 xxxx a series 470k cpu reset r v dd v dd2 v dd v dd1 out gnd gnd r3111 xxxx a series cpu reset r 470k
r3111x 20 r3111xxxxa cpu reset circuit cmos output v dd v dd v dd out gnd gnd r3111 xxxx c series cpu reset r3111xxxxa output delay time circuit 1 (nch open drain output) r3111xxxxa output delay time circuit 2 (nch open drain output) v dd v dd v dd out gnd gnd r3111 xxxx a series cpu reset r 470k vdd v dd v dd out gnd gnd r3111 xxxx a series cpu reset r2 r1 470k 100k memory back-up circuit v dd v dd out r3111 xxx x c series d1 v cc gnd gnd a b g y1 y2 y3 y4 d2 v cc gnd cs v cc gnd cs v cc gnd cs v cc gnd cs ram1 ram2 ram3 ram4 voltage level indicator circuit (lighted when the power runs out) (nch open drain output) v dd v dd out gnd r3111 xxxx a series
r3111x 21 detector threshold adjustable circuit (nch open drain output) v dd v dd out gnd r3111 xxxx a series c + ra rb adjusted detector threshold = ( ? v det ) ? (ra + rb)/rb hysteresis voltage = (v hys ) ? (ra + rb)/rb ? ) if the value of ra is set excessively large, voltage drop may occur caused by the supply current of ic itself, and detector threshold may vary. window comparator circuit (nch open drain output) v dd v dd v dd out out out gnd gnd r3111 xxxx a series r3111 xxxx a series v det 2 v det 1 v dd v ss v ss out v det 2 v det 1 over-charge preventing circuit v dd out gnd r3111 xxxx c series light r1 r2 r4 r3 d1 solar battery load
r3111x 22 technical notes v dd v dd out gnd r3111 series r v dd v dd out gnd r1 r2 r3111 series figure 9 figure 10 1. in figure 9, when r3111xxxxc is used, and if an impedance is connected between voltage supplier and the v dd pin of r3111xxxxc series, the operation might be unstable by cross conduction current at detection. when r3111xxxxa/b is used in figure 9, if the value of r is set excessively large, voltage drop may occur caused by supply current of ic itself and detector threshold may vary. 2. wiring as shown in figure 10 may cause the oscillation in both output types of r3111 series.

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