ADM706R AD [Analog Devices], ADM706R Datasheet - Page 7

• Manufacturer Part Number: ADM706R
• Description: +3 V, Voltage Monitoring uP Supervisory Circuits
• Manufacturer: AD [Analog Devices]

REV. A
1.3V
1.2V
PFO
+3V
PFI
+3V
0V
0V
Figure 11. PFI Deassertion Response Time
Figure 10. PFI Assertion Response Time
V
T
A
CC
V
T
= +25 C
Figure 12. RESET , RESET Assertion
CC
A
= +5V
= +25 C
= V
RESET
RT
500ns/DIV
500ns/DIV
100ns/DIV
RESET
V
T
A
CC
= +25 C
= +5V
+1.3V
PFI
+3V
+1.2V
PFO
0V
+3V
0V
–7–
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 P. Monitoring the
preregulator input gives additional time to execute an orderly
shutdown procedure before power is lost.
UNREGULATED
RESET
Figure 14. ADM706/ADM708 RESET Response Time
+3V
0V
V
+3V
+3V
CC
DC
Figure 13. RESET , RESET Deassertion
ADM706P/R/S/T, ADM708R/S/T
Figure 15. Typical Application Circuit
RESET
MANUAL
RESET
IN
ADM666A
GND
OUT
MR
PFI
100ns/DIV
ADM706
2 s/DIV
GND
V
CC
+3.3V
RESET
WDO
PFO
WDI
RESET
V
T
A
CC
T
= +25 C
A
= V
= +25 C
RT
RESET
I/O LINE
NMI
INTERRUPT
GND
+3V
0V
V
+2V
0V
CC
P