參數(shù)資料
型號(hào): ADM708RAR
廠商: ANALOG DEVICES INC
元件分類(lèi): 電源管理
英文描述: +3 V, Voltage Monitoring uP Supervisory Circuits
中文描述: 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
封裝: SOIC-8
文件頁(yè)數(shù): 7/8頁(yè)
文件大小: 129K
代理商: ADM708RAR
REV. A
–7–
ADM706P/R/S/T, ADM708R/S/T
+1.2V
0V
+3V
1.3V
PFI
PFO
500ns/DIV
V
CC
= +5V
T
A
= +25
8
C
Figure 10. PFI Assertion Response Time
+1.3V
PFI
+3V
0V
1.2V
PFO
500ns/DIV
V
CC
= +5V
T
A
= +25
8
C
Figure 11. PFI Deassertion Response Time
0V
0V
100ns/DIV
V
CC
= V
RT
T
A
= +25
8
C
RESET
+3V
RESET
+3V
Figure 12.
RESET
, RESET Assertion
APPLICATIONS
A typical operating Circuit is shown in Figure 15. The unregu-
lated dc input supply is monitored using the PFI input via the
resistive divider network. Resistors R1 and R2 should be selected
such that when the supply voltage drops below the desired level
(e.g., 5 V) the voltage on PFI drops below the 1.25 V threshold
thereby generating an interrupt to the
μ
P. Monitoring the
preregulator input gives additional time to execute an orderly
shutdown procedure before power is lost.
ADM706
PFI
RESET
I/O LINE
GND
m
P
MR
WDI
PFO
RESET
V
CC
+3.3V
WDO
V
CC
UNREGULATED
DC
INTERRUPT
GND
NMI
MANUAL
RESET
GND
IN
OUT
ADM666A
Figure 15. Typical Application Circuit
+3V
0V
0V
+3V
100ns/DIV
V
CC
= V
RT
T
A
= +25
8
C
RESET
RESET
Figure 13.
RESET
, RESET Deassertion
+2V
0V
V
CC
RESET
2
m
s/DIV
T
A
= +25
8
C
+3V
+3V
Figure 14. ADM706/ADM708
RESET
Response Time
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