DC2254A - Schematic

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
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