ADM811S(RevH) データシートの表示（PDF） - Analog Devices

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ADM811S
(Rev.:RevH)

Microprocessor Supervisory Circuit in 4-Lead SOT-143 with DSP

Analog Devices 

Data Sheet

Microprocessor Supervisory

Circuit in 4-Lead SOT-143 with DSP

ADM811/ADM812

FEATURES

Superior upgrade for MAX811/MAX812

Specified over temperature

Low power consumption: 5 μA typical

Precision voltage monitor: 2.5 V, 3 V, 3.3 V, 5 V options

Reset assertion down to 1 VCC

Power-on reset: 140 ms minimum

Logic low RESET output (ADM811)

Logic high RESET output (ADM812)

Built-in manual reset

APPLICATIONS

Microprocessor systems

Controllers

Intelligent instruments

Automotive systems

Safety systems

Portable instruments

GENERAL DESCRIPTION

The ADM811/ADM812 are reliable voltage monitoring devices

suitable for use in most voltage monitoring applications. The

ADM811/ADM812 are designed to monitor six different voltages,

each allowing a 5% or 10% degradation of standard PSU voltages

before a reset occurs. These voltages have been selected for the

effective monitoring of 2.5 V, 3 V, 3.3 V, and 5 V supply voltage

levels.

Included in this circuit is a debounced manual reset input.

Reset can be activated using an electrical switch (or an input

from another digital device) or by a degradation of the supply

voltage. The manual reset function is very useful, especially if

the circuit in which the ADM811/ADM812 are operating enters

FUNCTIONAL BLOCK DIAGRAM

VCC

VREF

ADM811/ADM812

RESET

GENERATOR

RESET/RESET

MR

DEBOUNCE

GND

Figure 1.

into a state that can only be detected by the user. Allowing the

user to reset a system manually can reduce the damage or

danger that could otherwise be caused by an out-of-control

or locked system.

VCC

ADM811

MR

RESET

GND

100kΩ

VCC

MICROPROCESSOR

SYSTEM

RESET

GND

Figure 2. Typical ADM811 Operating Circuit

Rev. H

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