ASM161 / ASM162

2 of 9

Notice: The information in this document is subject to change without notice

µP Supervisory Circuit

rev 1.0

October 2003

Block Diagram

Pin Configuration

RESET is open drain

Pin Description

Pin #

Pin Name

Description

ASM161

ASM162

1

1

GND

Ground.

2

-

RESET

An external pull-up resistor is needed.

-

2

RESET

33

MR

Manual reset input. A negative going edge transition on MR asserts reset. Reset

remains asserted for one reset time-out period (800 ms min). This active-LOW

input has an internal pull-up resistor. It can be driven from a TTL or CMOS logic line

or shorted to ground with a switch. Leave open if unused.

44

Power supply input voltage.

+

-

Voltage

Divider

MR

Debounce

Bandgap

Reference

Reset Circuit

* Edge Trigger

RESET (ASM162)

RESET (ASM161)

MR

GND

1

2

3

4

ASM161/162

* Non-retriggerable, edge

triggered manual reset

Reset

Circuit

ASM161

2

4

1

2

3

4

GND

RESET

MR

SOT-143

ASM161

1

2

3

4

GND

RESET

MR

SOT-143

ASM162