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AS1910R-T

Dual-Voltage Microprocessor Supervisory Circuits with Manual Reset and Watchdog

austriamicrosystems AG 

AS1910 - AS1915

Data Sheet - Detailed Description

Figure 11. Functional Diagram of RESETIN Supervisory Application

6

AS1910/AS1911/AS1912

VCC

Reset Timeout

Delay Generator

5

RESETIN

3

MRN

4

WDI

0.63V

+

–

1.26V

VCC

Watchdog Transition

Detector

Watchdog

Timer

1

RESETN/

RESET

2

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

R2

5

RESETIN

AS1910/

AS1911/

AS1912

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]

Note: Since RESETIN is powered by VCC, VRESETIN must not be larger than VCC.

(EQ 1)

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