ADM9690AR Analog Devices, ADM9690AR Datasheet

no-image

ADM9690AR

Manufacturer Part Number
ADM9690AR
Description
0.3-6V; 200mA; 400mW; power supply and swatchdog timer monitoring circuit
Manufacturer
Analog Devices
Datasheet

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ADM9690AR
Manufacturer:
AD
Quantity:
47
Part Number:
ADM9690AR
Manufacturer:
ADI/亚德诺
Quantity:
20 000
Part Number:
ADM9690ARZ
Manufacturer:
ADI/亚德诺
Quantity:
20 000
a
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
V
power-fail, two reset signals are generated. Both reset signals go
active (low) simultaneously. They will remain active while
V
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
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
CC
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
V
MON
FUNCTIONAL BLOCK DIAGRAM
4.31V
WATCHDOG
TIMEBASE
WATCHDOG
TRANSITION
DETECTOR
World Wide Web Site: http://www.analog.com
Monitoring Circuit
V
CC
GND
RESET(1)
RESET(2)
TIMER
TIMER
ADM9690
© Analog Devices, Inc., 2000
ADM9690
RESET(1)
RESET(2)

Related parts for ADM9690AR

ADM9690AR Summary of contents

Page 1

... V as low 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 ...

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

... Exposure to absolute maximum ratings for extended periods of time may affect device reliability. ORDERING GUIDE Temperature Package Model Range Description ADM9690AR –40°C to +85°C 8-Lead Narrow Body SOIC PIN CONFIGURATION MON ...

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