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AS1916 Datasheet(PDF) 6 Page - ams AG

Part No. AS1916
Description  Microprocessor Supervisory Circuits with Manual Reset and Watchdog
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Maker  AMSCO [ams AG]
Homepage  http://www.ams.com
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AS1916 Datasheet(HTML) 6 Page - ams AG

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www.austriamicrosystems.com
Revision 0.52
6 - 13
AS1916 - AS1918
austriamicrosystems
Data Sheet
Pin Assignments
7 Pinout
Pin Assignments
Figure 8. Pin Assignments (Top View)
Pin Descriptions
Table 4. Pin Descriptions
Pin
Number
Pin
Name
Description
1
RESETN
Active-Low Reset Output
(AS1916, AS1918). The RESETN signal toggles from high to low
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.
RESET
Active-High Reset Output
(AS1917). The RESET signal toggles from low to high when
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.
2GND
Ground
3MRN
Active-Low Manual Reset Input
. Pulling this pin low asserts a reset. This pin is connected
to the internal 50k
Ω pullup to VCC. This reset remains active as long as MRN is low and for
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.
4WDI
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
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.
5VCC
Supervised Voltage Input
. This pin serves as the supervised supply voltage input.
AS1916 -
AS1918
2
GND
3
MRN
1
RESETN/RESET
4 WDI
5 VCC


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