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LS7217 Fiches technique(PDF) 5 Page - LSI Computer Systems

No de pièce LS7217
Description  PHOTO CONTROLLED OUTDOOR LIGHTING WITH PROGRAMMABLE TIMER
PDF  6 Pages
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Fabricant  LSI [LSI Computer Systems]
Site Internet  http://www.lsicsi.com
Logo LSI - LSI Computer Systems

LS7217 Fiches technique(HTML) 5 Page - LSI Computer Systems

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FIGURE 4. BATTERY BACK-UP FOR AC POWER FAILURE
R1=1k
Ω
R2=270k
Ω
R3=100k
Ω
R4=100k
Ω
R5=1M
Ω
7217-091814-5
R6=10k
Ω
R7=10k
Ω
R8=50k
Ω
R9=1M
Ω
D1=1N4004
D2=1N4004
D3=1N4004
D4=1N4004
D5=1N4004
Q1=2N2222
U1=ICM7555
C1=220uF
C2=470uF
C3=0.1uF
C4=0.1uF
C5=0.1uF
C6=470pF
Figure 4 shows how to connect a back-up battery circuit to the LS7217 timer in case of power failure.
Upon ac power failure, U1 generates either a 50Hz or 60Hz clock (set by R8) so that the LS7217 timeout
remains uninterrupted. When power returns timeout continues as if no ac interruption occurred.



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