AS1916(2005) 데이터 시트보기 (PDF) - austriamicrosystems AG

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AS1916
(Rev.:2005)

Microprocessor Supervisory Circuits with Manual Reset and Watchdog

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AS1916 - AS1918

Data Sheet

7 Pinout

Pin Assignments

Figure 8. Pin Assignments (Top View)

RESETN/RESET 1

5 VCC

GND 2

AS1916 -

AS1918

MRN 3

4 WDI

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Pin Assignments

Pin Descriptions

Table 4. Pin Descriptions

Pin

Pin

Number Name

Description

Active-Low Reset Output (AS1916, AS1918). The RESETN signal toggles from high to low

RESETN

when VCC, or MRN is pulled low, or the watchdog triggers a reset. This output signal remains

low for the reset timeout period after all supervised voltages exceed their reset threshold, or

MRN goes low to high, or the watchdog triggers a reset.

1

Active-High Reset Output (AS1917). The RESET signal toggles from low to high when

RESET

VCC, or MRN is pulled low, or the watchdog triggers a reset. This output signal remains high

for the reset timeout period (see tRP on page 3) after all supervised voltages exceed their

reset threshold, or MRN goes low to high, or the watchdog triggers a reset.

2

GND Ground

Active-Low Manual Reset Input. Pulling this pin low asserts a reset. This pin is connected

to the internal 50kΩ pullup to VCC. This reset remains active as long as MRN is low and for

3

MRN the reset timeout period (see tRP on page 3) after MRN goes high.

Note: If the manual reset feature is not used, this pin should be unconnected or connected

to VCC.

Watchdog Input. If WDI remains high or low for longer than the watchdog timeout period

(see tWD on page 4), the internal watchdog timer period expires and a reset is triggered for

the reset timeout period (see tRP on page 3). The internal watchdog timer clears whenever a

4

WDI reset is a asserted or when WDI senses a rising or falling edge.

Note: To disable the watchdog feature, this pin must be unconnected or connected to a tri-

state buffer output.

5

VCC Supervised Voltage Input. This pin serves as the supervised supply voltage input.

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