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ADM825TYRJZ-R7 产品设计参考手册 - ADI（亚德诺）
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ADI（亚德诺）
分类:
电源监控芯片
封装:
SOT-23-5
描述:
ANALOG DEVICES ADM825TYRJZ-R7 监控器电路, 手动复位, 高电平有效, 低电平有效复位, 3.15V-3.6V输入, SOT-23-5
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ADM825TYRJZ-R7数据手册
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Supervisory Circuits with Watchdog and
Manual Reset in 5-Lead SC70 and SOT-23
ADM823/ADM824/ADM825
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 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 registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2007 Analog Devices, Inc. All rights reserved.
FEATURES
Precision 2.5 V to 5 V power supply monitor
7 reset threshold options: 2.19 V to 4.63 V
140 ms (minimum) reset timeout
Watchdog timer with 1.6 sec timeout (ADM823, ADM824)
Manual reset input (ADM823, ADM825)
Push-pull output stages
RESET
(ADM823)
RESET
, RESET (ADM824/ADM825)
Low power consumption (5 μA)
Guaranteed reset output valid to V
CC
= 1 V
Power supply glitch immunity
Specified over automotive temperature range
5-lead SC70 and SOT-23 packages
APPLICATIONS
Microprocessor systems
Computers
Controllers
Intelligent instruments
Portable equipment
FUNCTIONAL BLOCK DIAGRAM
ADM823
V
CC
V
CC
MR
GND WDI
RESET
RESET
GENERATOR
WATCHDOG
DETECTOR
DEBOUNCE
V
REF
04534-001
Figure 1.
GENERAL DESCRIPTION
The ADM823/ADM824/ADM825 are supervisory circuits
which monitor power supply voltage levels and code execution
integrity in microprocessor-based systems. In addition to
providing power-on reset signals, an on-chip watchdog timer
can reset the microprocessor if it fails to strobe within a preset
timeout period. A reset signal can also be asserted by an
external push-button, through a manual reset input. The three
parts feature different combinations of watchdog input, manual
reset input, and output stage configuration, as shown in
Table 1 .
Each part is available in a choice of seven reset threshold
options ranging from 2.19 V to 4.63 V. The reset and watchdog
timeout periods are fixed at 140 ms (minimum) and 1.6 sec
(typical), respectively.
The ADM823/ADM824/ADM825 are available in 5-lead SC70
and SOT-23 packages and typically consume only 3 μA, making
them suitable for use in low power, portable applications.
Table 1. Selection Table
Output Stage
Part No. Watchdog Timer Manual Reset
RESET
RESET
ADM823 Yes Yes Push-Pull –
ADM824 Yes – Push-Pull Push-Pull
ADM825 – Yes Push-Pull Push-Pull
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