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參數(shù)資料
| 型號： | ADM9690 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Power Supply and Watchdog Timer Monitoring Circuit |
| 中文描述： | 電源供應器和看門狗定時器監(jiān)測電路 |
| 文件頁數(shù)： | 1/6頁 |
| 文件大?。?/td> | 76K |
| 代理商： | ADM9690 |
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.
a
ADM9690
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 2000
Power Supply and Watchdog Timer
Monitoring Circuit
FUNCTIONAL BLOCK DIAGRAM
WATCHDOG
TRANSITION
DETECTOR
V
CC
V
MON
OSC SEL1
OSC SEL2
RESET(2)
TIMER
RESET(1)
TIMER
4.31V
ADM9690
RESET(1)
RESET(2)
WATCHDOG
INPUT (WDI)
GND
WATCHDOG
TIMEBASE
FEATURES
Precision Voltage Monitor (4.31 V)
Watchdog Timeout Monitor
Selectable Watchdog Timeout—0.75 ms, 1.5 ms,
12.5 ms, 25 ms
Two RESET Outputs
APPLICATIONS
Microprocessor Systems
Computers
Printers
Controllers
Intelligent Instruments
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
MON
. If it drops outside tolerance, as will happen during a
power-fail, two reset signals are generated. Both reset signals go
active (low) simultaneously. They will remain active while
V
MON
is below the threshold, and for 50 ms (RESET(1
)
) or
60 ms (RESET(2
)
) after V
MON
climbs above the reset thresh-
old. RESET(1) is intended to provide a power-on reset signal
for the
μ
P while RESET(2
)
is used to hold additional circuitry
in a reset state until the
μ
P has regained control following a
power-up. The voltage monitoring circuitry remains operational
with V
CC
as low as 2 V.
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
μ
P. 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.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADM9690AR | 制造商:AD 制造商全稱:Analog Devices 功能描述:Power Supply and Watchdog Timer Monitoring Circuit |
| ADM9690ARN | 制造商:Rochester Electronics LLC 功能描述:SUPERVISOR WITH 2 RESETS I.C. - Bulk 制造商:Analog Devices 功能描述:SUPERVISORY CIRCUIT 9690 SOIC8 |
| ADM9690ARN-REEL | 制造商:Analog Devices 功能描述:Processor Supervisor 4.31V 4.31V 8-Pin SOIC N T/R |
| ADM9690ARNZ | 功能描述:IC SUPERVISOR PS/WATCHDOG 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標準包裝:1 系列:- 類型:簡單復位/加電復位 監(jiān)視電壓數(shù)目:1 輸出:開路漏極或開路集電極 復位:高有效 復位超時:- 電壓 - 閥值:1.8V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線 供應商設備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱:NCP301HSN18T1GOSCT |
| ADM9690ARNZ-REEL | 功能描述:IC SUPERVISOR PS/WATCHDOG 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標準包裝:400 系列:- 類型:備用電池電路 監(jiān)視電壓數(shù)目:1 輸出:開路漏極，推挽式 復位:高有效/低有效 復位超時:最小為 35 ms 電壓 - 閥值:4.65V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:16-SOIC W 包裝:帶卷 (TR) 其它名稱:ADM691ARZ-REEL7TR |
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