AS1916 查看數據表（PDF） - austriamicrosystems AG

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AS1916

Microprocessor Supervisory Circuits with Manual Reset and Watchdog

austriamicrosystems AG 

AS1916 - AS1918

Datasheet - Pin Assignments

4 Pin Assignments

Figure 2. Pin Assignments (Top View)

RESETN/RESET 1

5 VCC

lid GND 2 AS1916 - AS1918

va MRN 3

4 WDI

G still 4.1 Pin Descriptions

A t Table 2. Pin Descriptions

s n Pin Number Pin Name

Description

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

m te RESETN

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.

a n 1

Active-High Reset Output (AS1917). The RESET signal toggles from low to high when VCC, or MRN is pulled

o RESET

low, or the watchdog triggers a reset. This output signal remains high for the reset timeout period (see tRP on

page 4) after all supervised voltages exceed their reset threshold, or MRN goes low to high, or the watchdog

triggers a reset.

c 2

GND Ground

l 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 the reset timeout period (see tRP on

a 3

MRN

page 4) after MRN goes high.

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

ic Watchdog Input. If WDI remains high or low for longer than the watchdog timeout period (see tWD on page 5),

the internal watchdog timer period expires and a reset is triggered for the reset timeout period (see tRP on page

4). The internal watchdog timer clears whenever a reset is a asserted or when WDI senses a rising or falling

n 4

WDI

edge.

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

hWDI must be low or unconnected (tristate) during the reset timeout period tRP, (see Figure 11 on page 8).

Tec 5

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

www.austriamicrosystems.com/Supervisors/AS1916

Revision 1.04

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