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ADM8323

更新时间： 2024-01-12 05:54:18
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亚德诺 - ADI /
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16页 283K
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Supervisory Circuits with Windowed Watchdog and Manual Reset in 5-Lead SOT-23

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Supervisory Circuits with Windowed  
Watchdog and Manual Reset in 5-Lead SOT-23  
Data Sheet  
ADM8323/ADM8324  
FEATURES  
FUNCTIONAL BLOCK DIAGRAMS  
Windowed watchdog, 8 timeout options  
26 reset threshold options  
ADM8323  
V
CC  
2.5 V to 5 V in 100 mV increments  
4 reset timeout options  
1 ms, 20 ms, 140 ms, and 1120 ms (minimum)  
Manual reset input  
V
CC  
RESET  
RESET  
GENERATOR  
V
REF  
DEBOUNCE  
MR  
RESET  
Open-drain or push-pull  
Low power consumption  
outputs  
WINDOWED  
WATCHDOG  
DETECTOR  
Specified over wide temperature range (−40°C to +125°C)  
Qualified for automotive applications  
5-lead SOT-23 package  
GND  
WDI  
Figure 1.  
ADM8324  
APPLICATIONS  
Automotive  
Microprocessor systems  
Computers  
RESET  
V
CC  
RESET  
GENERATOR  
V
REF  
Controllers  
MR  
DEBOUNCE  
Intelligent instruments  
Portable equipment  
WINDOWED  
WATCHDOG  
DETECTOR  
GND  
WDI  
Figure 2.  
GENERAL DESCRIPTION  
The ADM8323/ADM8324 are supervisory circuits that monitor  
power supply voltage levels and code execution integrity in  
microprocessor-based systems. An on-chip watchdog timer  
checks for activity within a preset timeout window. A reset  
signal can also be asserted by an external push-button switch  
pulse. The watchdog timeout is measured from the last falling  
edge of the watchdog input (WDI). There are eight different  
watchdog windows available, as shown in Table 5.  
Each device is available in a choice of 26 reset threshold options  
from 2.5 V to 5 V in 100 mV increments. There are also four  
reset timeout options of 1 ms, 20 ms, 140 ms, and 1120 ms  
(minimum).  
through a manual reset input. The  
output is either push-  
RESET  
pull (ADM8323) or open-drain (ADM8324).  
A watchdog failure results in a low output on the  
A failure can be triggered either by a fast watchdog error  
(watchdog pulses too close together) or by a slow watchdog  
error (no watchdog pulse within the timeout period). This  
effectively gives a window in which to observe the watchdog  
pin.  
RESET  
The ADM8323/ADM8324 are available in a 5-lead SOT-23  
package and typically consume only 10 μA, making them  
suitable for use in low power portable applications.  
Rev. 0  
Document Feedback  
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 that may result from its use. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks and registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Technical Support  
©2013 Analog Devices, Inc. All rights reserved.  
www.analog.com  
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