ADM9690ARNZ-REEL Analog Devices Inc, ADM9690ARNZ-REEL Datasheet

ADM9690ARNZ-REEL

Manufacturer Part Number

ADM9690ARNZ-REEL

Description

SUPERVISOR WITH 2 RESETS I.C.

Manufacturer

Analog Devices Inc

Type

Watchdog Circuitr

Datasheet

1.ADM9690ARNZ-REEL.pdf (6 pages)

Specifications of ADM9690ARNZ-REEL

Number Of Voltages Monitored

Output

Push-Pull, Totem Pole

Reset

Active Low

Reset Timeout

10 ms, 50 ms Typical

Voltage - Threshold

4.31V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

8-SOIC (3.9mm Width)

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Current page: 1 of 6
Download datasheet (78Kb)

GENERAL DESCRIPTION

The ADM9690 contains a voltage monitoring comparator and a

watchdog timer monitor. It is designed to monitor the 5 V

power supply to a microprocessor and the microprocessor opera-

tion via a watchdog function.

The voltage monitoring comparator monitors the voltage on

power-fail, two reset signals are generated. Both reset signals go

active (low) simultaneously. They will remain active while

60 ms (RESET(2)) after V

old. RESET(1) is intended to provide a power-on reset signal

for the µP while RESET(2) is used to hold additional circuitry

in a reset state until the µP has regained control following a

power-up. The voltage monitoring circuitry remains operational

with V

REV. A

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

MON

FEATURES

Precision Voltage Monitor (4.31 V)

Watchdog Timeout Monitor

Selectable Watchdog Timeout—0.75 ms, 1.5 ms,

Two RESET Outputs

APPLICATIONS

Microprocessor Systems

Computers

Printers

Controllers

Intelligent Instruments

12.5 ms, 25 ms

. If it drops outside tolerance, as will happen during a

is below the threshold, and for 50 ms (RESET(1)) or

as low as 2 V.

MON

climbs above the reset thresh-

Power Supply and Watchdog Timer

The watchdog timer monitoring circuit is designed to monitor

the activity on the WDI input. This input is normally connected

to an output line on the µP. Its function is to check that the

microprocessor has not stalled in an infinite loop. If there is a

period of inactivity for the watchdog timeout period, both reset

outputs are activated. As above, RESET(1) remains low for

50 ms while RESET(2) remains low for an additional 10 ms.

The watchdog timer is restarted when RESET(1) goes inactive.

The actual watchdog timeout period is adjustable using two

select inputs SEL1 and SEL2.

The ADM9690 is available in an 8-lead SOIC package. It is

specified over the industrial temperature range.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

Fax: 781/326-8703

WATCHDOG

INPUT (WDI)

OSC SEL2

OSC SEL1

MON

FUNCTIONAL BLOCK DIAGRAM

4.31V

WATCHDOG

TIMEBASE

WATCHDOG

TRANSITION

DETECTOR

World Wide Web Site: http://www.analog.com

Monitoring Circuit

GND

RESET(1)

RESET(2)

TIMER

ADM9690

RESET(1)

RESET(2)

Related parts for ADM9690ARNZ-REEL

ADM9690ARNZ-REEL Summary of contents

Page 1

FEATURES Precision Voltage Monitor (4.31 V) Watchdog Timeout Monitor Selectable Watchdog Timeout—0.75 ms, 1.5 ms, 12.5 ms Two RESET Outputs APPLICATIONS Microprocessor Systems Computers Printers Controllers Intelligent Instruments GENERAL DESCRIPTION The ADM9690 contains a voltage monitoring comparator ...

Page 2

ADM9690–SPECIFICATIONS Parameter V OPERATING VOLTAGE RANGE CC SUPPLY CURRENT RESET AND WATCHDOG TIMER Reset Voltage Threshold Reset Threshold Hysteresis Reset Timeout Delay ( RESET(2) Timeout Delay ( WATCHDOG TIMEOUT PERIOD (TWD) WDI INPUT PULSEWIDTH RESET(1)/(2) Output ...

Page 3

ABSOLUTE MAXIMUM RATINGS +25°C unless otherwise noted ...

Page 4

ADM9690 –Typical Performance Curves CH1 1.0V CH2 M 500ms 1.0V Figure 1. Reset Output Voltage vs. Supply 4.412 4.410 4.408 4.406 4.404 4.402 4.400 4.398 4.396 –60 – TEMPERATURE – C Figure 2. Reset Voltage Threshold vs. Temperature ...

Page 5

POWER SUPPLY AND WATCHDOG MONITORING CIRCUIT The ADM9690 contains a power supply voltage monitoring comparator and a watchdog timer monitor. Either V ping outside tolerance or the watchdog timer timing out results in a reset sequence as discussed below. Two ...

Page 6

ADM9690 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-Lead Narrow Body SOIC (SO-8) 0.1968 (5.00) 0.1890 (4.80 0.1574 (4.00) 0.2440 (6.20 0.1497 (3.80) 0.2284 (5.80) PIN 1 0.0688 (1.75) 0.0196 (0.50) 0.0098 (0.25) 0.0532 (1.35) ...

Related keywords

ADM9690ARNZ-REEL datasheet
ADM9690ARNZ-REEL data sheet
ADM9690ARNZ-REEL pdf datasheet
ADM9690ARNZ-REEL component
ADM9690ARNZ-REEL part
ADM9690ARNZ-REEL distributor
ADM9690ARNZ-REEL RoHS
ADM9690ARNZ-REEL datasheet download