6 Special Circuit Descriptions
SAM4S ER-600 SERIES
6
-3
6-2 RESET and Power Fail Circuit
6-2-1 Reset Circuit
Reset signal is a signal in order to start-up CPU under Power-on. Reset circuit uses a reset IC M51953B(U17). When
+5VDC is fallen under 4.3Vdc by Power-off, reset signal prohibits the system from misoperating by lowering down to
0V.
6-2-2 Power Fail Detect Circuit
Power Fail Sensing Circuit detects sudden power-off to backup the needed data and current CPU status into RAM
before 80ms just 5V drops. When power is turned on, the CPU does the operations which were working
before power-off. This system is designed to sense the time when the AC Line voltage is goes down to 89Vac(USA)
or 170Vac(Europe) . That is, when +24Vdc goes down to +14Vdc.
V80
D18
VCC
D22
VDRV_COMP
VDRV_COMP
INT0_PFAIL
1K
R36
1.2K
R38
VCC
C42
100nF
VCC
VCC
VCC
15K
R37
3.3K
R39
R40
4.7K
C41
100nF
[24V Power Fail Detect]
1
8
4
3
2
LM393D
U15:1
4.7uF
C36
50V
VDRV
6.8K
R35
if, VDRV
•Ó•§•£
8V
•¦‹}
""LOW"
Figure 6-2 Power Fail Detect Circuit
Summary of Contents for ER-600
Page 48: ...8 Exploded Views and Parts List 8 6 SAM4S ER 600 SERIES MEMO...
Page 54: ...9 PCB Layout and Parts List 9 6 SAM4S ER 600 SERIES MEMO...
Page 55: ...SAM4S ER 600 SERIES 10 1 10 Block Diagram 10 1 ER 600...
Page 56: ...10 Block Diagram 10 2 SAM4S ER 600 SERIES MEMO...
Page 58: ...11 Wiring Diagram 11 2 SAM4S ER 600 SERIES 11 2 Wiring Diagram Figure11 1 Wiring Diagram...
Page 68: ...Shin Heung Precision FEBRUARY 2004 Printed in KOREA V1 1 Code No JK68 60935A...
