Version 4 SHEET 1 880 680 WIRE -672 -176 -880 -176 WIRE -544 -176 -672 -176 WIRE -432 -176 -544 -176 WIRE -192 -176 -304 -176 WIRE -32 -176 -192 -176 WIRE 16 -176 -32 -176 WIRE 496 -176 400 -176 WIRE -880 -144 -880 -176 WIRE -544 -144 -544 -176 WIRE -432 -144 -432 -176 WIRE -304 -144 -304 -176 WIRE -192 -144 -192 -176 WIRE 496 -144 496 -176 WIRE -16 -80 -112 -80 WIRE 16 -80 -16 -80 WIRE -112 -64 -112 -80 WIRE -304 -48 -304 -64 WIRE -192 -48 -192 -80 WIRE -880 -32 -880 -64 WIRE -544 -32 -544 -80 WIRE -432 -32 -432 -64 WIRE -432 -32 -544 -32 WIRE 496 -32 496 -64 WIRE -112 16 -112 0 WIRE 16 16 -112 16 WIRE -672 96 -672 -176 WIRE -672 96 -992 96 WIRE -432 96 -432 -32 WIRE 432 144 400 144 WIRE 608 144 432 144 WIRE 608 160 608 144 WIRE -992 176 -992 96 WIRE -944 176 -992 176 WIRE -640 176 -720 176 WIRE -480 176 -560 176 WIRE -432 240 -432 192 WIRE 16 240 -16 240 WIRE -944 256 -976 256 WIRE -672 256 -672 96 WIRE -672 256 -720 256 WIRE 16 288 -80 288 WIRE 432 288 400 288 WIRE 448 288 432 288 WIRE 544 288 448 288 WIRE 608 288 608 224 WIRE -80 304 -80 288 WIRE 448 304 448 288 WIRE 544 304 544 288 WIRE -944 336 -976 336 WIRE -688 336 -720 336 WIRE -976 384 -976 336 WIRE -80 400 -80 384 WIRE 208 400 208 368 WIRE 448 400 448 368 WIRE 544 400 544 384 WIRE -976 496 -976 464 FLAG 208 400 0 FLAG -192 -48 0 FLAG -304 -48 0 FLAG -80 400 0 FLAG -16 240 0 FLAG 448 400 0 FLAG 608 288 0 FLAG -32 -176 ACIN FLAG -16 -80 Vcc FLAG 432 144 BAT FLAG 432 288 OUT FLAG 496 -32 0 FLAG 544 400 0 FLAG -432 240 0 FLAG -688 336 0 FLAG -880 -32 0 FLAG -976 256 0 FLAG -976 496 0 SYMBOL cap -208 -144 R0 WINDOW 39 24 36 Left 2 SYMATTR InstName Crx SYMATTR Value 47n SYMBOL ind2 -288 -48 R180 WINDOW 0 -33 84 Left 2 WINDOW 3 -37 33 Left 2 SYMATTR InstName Lrx SYMATTR Value 13µ SYMATTR Type ind SYMBOL LED -128 -64 R0 SYMATTR InstName D1 SYMATTR Value NSCW100 SYMATTR Description Diode SYMATTR Type diode SYMBOL res -96 288 R0 SYMATTR InstName R1 SYMATTR Value 12.4k SYMBOL cap 432 304 R0 SYMATTR InstName C1 SYMATTR Value 2.2µ SYMBOL cap 592 160 R0 WINDOW 123 24 84 Left 2 WINDOW 39 24 112 Left 2 SYMATTR Value2 IC=3.5 SYMATTR SpiceLine Rser=1m SYMATTR InstName BAT SYMATTR Value 0.1m SYMBOL ind2 -448 -48 M180 WINDOW 0 43 84 Left 2 WINDOW 3 47 33 Left 2 SYMATTR InstName Ltx SYMATTR Value 6.8µ SYMATTR Type ind SYMBOL voltage 496 -160 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V2 SYMATTR Value 3.3 SYMBOL res 528 288 R0 SYMATTR InstName R3 SYMATTR Value 10k SYMBOL cap -560 -144 R0 WINDOW 39 24 36 Left 2 SYMATTR InstName Ctx SYMATTR Value 47n SYMBOL LTC6990 -832 256 R0 SYMATTR InstName U2 SYMBOL nmos -480 96 R0 SYMATTR InstName M1 SYMATTR Value Si2316DS SYMBOL voltage -880 -160 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 5 SYMBOL res -992 368 R0 SYMATTR InstName R2 SYMATTR Value 243k SYMBOL res -544 160 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 10 SYMBOL LTC4126-ADJ 208 80 R0 SYMATTR InstName U1 SYMATTR Value2 S_Timer=20m TEXT -320 528 Left 2 !.tran 25m startup TEXT -440 -208 Left 2 !K1 Ltx Lrx 0.2 TEXT 0 472 Left 2 ;To reduce simulation time, the safety timer \ntermination period, the fast blink frequency,\nand the slow blink frequency are parametrized.