AS1910 - AS1915
Data Sheet - Detailed Description
Figure 11. Functional Diagram of RESETIN Supervisory Application
6
AS1910/AS1911/AS1912
VCC
1
Reset Timeout
Delay Generator
RESETN/
RESET
+
1.26V
–
0.63V
5
VCC
RESETIN
3
MRN
4
Watchdog Transition
Detector
Watchdog
Timer
2
WDI
GND
RESETIN
The AS1910/AS1911/AS1912 feature a user-adjustable supervisory voltage input (RESETIN). The threshold voltage
for RESETIN is between 0.61 and 0.65V (0.63 typ).
Figure 12. Voltage Monitoring Circuit
VMONITOR
R1
AS1910/
AS1911/
5
RESETIN
AS1912
R2
VCC ≥ VRESETIN
To monitor a voltage higher than 0.63V, connect a resistor divider network to the circuit as shown in Figure 12. For the
circuit shown in Figure 12, the threshold at VMONITOR is:
VMONITOR_TRIP = 0.63V [(R1 + R2)/R2]
(EQ 1)
Note: Since RESETIN is powered by VCC, VRESETIN must not be larger than VCC.
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