参数资料
| 型号： | ADM9690ARNZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/6页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR PS/WATCHDOG 8SOIC |
| 标准包装： | 98 |
| 类型： | 监视器电路 |
| 监视电压数目： | 1 |
| 输出： | 推挽式，图腾柱 |
| 复位： | 低有效 |
| 复位超时： | 标准为 10 ms、50 ms |
| 电压 - 阀值： | 4.31V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
a
FEATURES
Precision Voltage Monitor (4.31 V)
Watchdog Timeout Monitor
Selectable Watchdog Timeout—0.75 ms, 1.5 ms,
Power Supply and Watchdog Timer
Monitoring Circuit
ADM9690
FUNCTIONAL BLOCK DIAGRAM
V CC
12.5 ms, 25 ms
Two RESET Outputs
V MON
ADM9690
4.31V
APPLICATIONS
Microprocessor Systems
Computers
Printers
Controllers
Intelligent Instruments
OSC SEL1
OSC SEL2
WATCHDOG
INPUT (WDI)
WATCHDOG
TIMEBASE
WATCHDOG
TRANSITION
DETECTOR
RESET(1)
TIMER
RESET(2)
TIMER
RESET(1)
RESET(2)
GND
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.
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.
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.
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
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