DESIGN SHOWCASE
1 30 1 Q1 Q1 IC1
20mA 70µA µP (IC1) (
3 AA 5556 555
IC1
)
60µA 40µA
IC1
(Q3) C2=µF
WDS
500 30
R7 / ( IC2) Q1 1s
B MAX6304
:
(IC3)
140ms Q4 A tRESET =()(C1)(in µF) =
R1 R2 ; 3V
tWATCHDOG=()(C2)(in µF)(500)=30
Q2
( D3)
1/1/98 EDN
3V
30 1
D3 C3
µF
R1 7 IC2 Q3 4
18k V+ VCC
INB- 4 BUZZER
MAX933 IC3
1 8 3 INA+
THREE RESET IN VCC MAX811R
8 32
AA CELLS MR RESET
2 7 A B
GRD IC1 RESET OUTB GRD
1 Q4
3 6
SRT WDI
MAX6304 R2 1/2 Si992
11k REF HYS OUTA V-
4 5
C1 SWT WDS 6512 Q2
µF BC182 R7 R8
R5 10k 100k
D1
C2 1k
µF 1N4148
R3 R4 R6
10k D2 39Ω
Q1
1/2 Si9926
1. 3 AA
13
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