AS1916 - AS1918

Microprocessor Supervisory Circuits with Manual Reset and Watchdog

www.austriamicrosystems.com/Supervisors/AS1916

Revision 1.04

1 - 14

Datasheet

1 General Description

The AS1916 - AS1918 microprocessor supervisory circuits were

designed to generate a reset when the monitored supply voltage falls

below a factory-trimmed threshold. The reset remains asserted for a

minimum timeout period after the supply voltage stabilizes.

these devices are ideal for portable and battery-powered systems

with strict monitoring requirements.

The devices feature factory-trimmed thresholds to monitor a supply

voltage between 1.8 and 3.6V.

The devices are available with the reset output types listed in Table

1.

The AS1916 - AS1918 include a manual-reset input for systems that

never fully power down the microprocessor.

Additionally, these devices feature a watchdog timer to help ensure

that the processor is operating within proper code boundaries.

The AS1916 - AS1918 are available in a 5-pin SOT23 package.

Figure 1. Typical Application Diagram

2 Key Features

Reset Timeout Delay: 215ms

Manual Reset Input

Three Reset Output Types

- Active-Low Push/Pull (AS1916)

- Active-High Push/Pull (AS1917)

- Active-Low Open-Drain (AS1918)

Watchdog Timeout Period: 1.5s

External Components Not Required

Operating Temperature Range: -40 to +125°C

5-pin SOT23 Package

3 Applications

The devices are ideal for portable and battery-powered systems,

embedded controllers, intelligent instruments, automotive systems,

and critical CPU monitoring applications.

Table 1. Standard Products

Model

Reset Output Type

AS1916

Active-Low Push/Pull

AS1917

Active-High Push/Pull

AS1918

Active-Low Open-Drain

AS1916/

AS1918

External

Reset

CPU

I/O Supply

GND

RESETN

I/O

4

WDI

5

VCC

3

MRN

GND 2

1

RESETN