5 4 3 2 1 REVISION HISTORY ECO E1 REV __ ONMAX D R1 9.76k R2 26.1k R3 35.7k R4 47.5k R5 127k R6 210k R7 280k R8 383k 1 DESCRIPTION APPROVED DATE PRODUCTION SAL H. 08-11-14 ON SW1 1 2 3 4 5 6 7 8 0.128S SHUT DOWN 0.512S SHUT DOWN 1.024s SHUT DOWN 2.048s SHUT DOWN 0.128S RUN 0.512S RUN 1.024s RUN 2.048s RUN 1 16 15 14 13 12 11 10 9 AWAKE TIMER EXTERNAL 3 2 13.3ms/nF 1 19.9ms C1 JP1 1500pF D E2 ONALERT 1 OFFALERT VIN PBOUT E7 Q1 * 3 2 R16 OPT R17 R18 * * R19 100k 2 SW2 EVQPE105K OUT SHDN 2 3 GND 4 GND GND ADJ 1 C5 1uF E10 1 IN REF/BYP 7 C3 OPT R25 158k 8 C6 0.01uF LT3060ETS8 C4 2.2uF R27 49.9k 2 GND NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN OHMS, 0402. ALL CAPACITORS ARE IN MICROFARADS, 0603. A ASSY U1 SUFFIX E7, LED1 Q1 R17 R18 A LTC2956 - 1 1 EN 2N7002 OPT 430 B LTC2956 - 2 2 LED1 L ED1 GREEN R23 100k ONALERT LED2 YELLOW R24 430 OFFALERT LED3 RED PBOUT LED4 YELLOW EN OPT 430 4 B E8 R26 470 LDO_OUT 2.5V, 100mA E9 GND LED SUPPLY LED5 GREEN CUSTOMER NOTICE APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 3 TECHNOLOGY KIM T. SAL H. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC WAKE UP TIMER WITH PUSH BUTTON CONTROL SIZE OPT THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 R22 430 6 E11 * R21 100k 1 5 JP3 LDO_IN 5V - 36V * U2 LDO_IN 1 INT 2 3 EXT R20 430 1 B * 2 1 PB 1 * 2 PB PBOUT C 1 EP 7 13 U1 LTC2956 - R15 1k E12 OFFALERT E6 10 2 C2 0.1uF GND ONALERT PERIOD 1 E13 C 6 SLEEP E4 11 2 R14 1k E3 12 EN/EN R12 9.76k E5 5 SLEEP 9 R13 100k R10 100k RANGE GND VIN 1.6V - 36V 4 PB JP2 R11 17.4k 8 RANGE TIME PERIOD 1 1s 2 3 250ms LONG R9 100k ONMAX 3 2 BD08 N/A SCALE = NONE 2 DATE: IC NO. LTC2956IUD-1 / 2 DEMO CIRCUIT 2254A Monday, August 11, 2014 REV. 1 SHEET 1 1 OF 1 A