Microprocessor Supervisory Circuit in 4-Lead SOT-143 with DSP Data Sheet ADM811/ADM812 FEATURES FUNCTIONAL BLOCK DIAGRAM Superior upgrade for MAX811/MAX812 ADM811/ADM812 Specified over temperature V CC RESET Low power consumption: 5 A typical RESET/RESET GENERATOR V REF Precision voltage monitor: 2.5 V, 3 V, 3.3 V, 5 V options Reset assertion down to 1 V CC MR DEBOUNCE GND Power-on reset: 140 ms minimum RESET Logic low output (ADM811) Figure 1. Logic high RESET output (ADM812) Built-in manual reset APPLICATIONS Microprocessor systems Controllers Intelligent instruments Automotive systems Safety systems Portable instruments GENERAL DESCRIPTION The ADM811/ADM812 are reliable voltage monitoring devices into a state that can only be detected by the user. Allowing the suitable for use in most voltage monitoring applications. The user to reset a system manually can reduce the damage or ADM811/ADM812 are designed to monitor six different voltages, danger that could otherwise be caused by an out-of-control each allowing a 5% or 10% degradation of standard PSU voltages or locked system. before a reset occurs. These voltages have been selected for the effective monitoring of 2.5 V, 3 V, 3.3 V, and 5 V supply voltage V V CC CC levels. ADM811 MICROPROCESSOR Included in this circuit is a debounced manual reset input. SYSTEM MR RESET RESET Reset can be activated using an electrical switch (or an input 100k from another digital device) or by a degradation of the supply GND GND voltage. The manual reset function is very useful, especially if the circuit in which the ADM811/ADM812 are operating enters Figure 2. Typical ADM811 Operating Circuit Rev. H 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 19992016 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 00092-002 00092-001ADM811/ADM812 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Reset Thresholds ...........................................................................8 Applications ....................................................................................... 1 Reset Output ..................................................................................8 Functional Block Diagram .............................................................. 1 Manual Reset ..................................................................................8 General Description ......................................................................... 1 Glitch Immunity ............................................................................8 Revision History ............................................................................... 2 Interfacing to Other Devices ............................................................9 Specif icat ions ..................................................................................... 3 Output .............................................................................................9 Absolute Maximum Ratings ............................................................ 5 Benefits of a Very Accurate Reset Threshold ............................9 ESD Caution .................................................................................. 5 RESET Ensuring a Valid /Reset Output Down to VCC = 0 V....9 Pin Configuration and Function Descriptions ............................. 6 Outline Dimensions ....................................................................... 10 Typical Performance Characteristics ............................................. 7 Ordering Guide .......................................................................... 10 Circuit Information .......................................................................... 8 REVISION HISTORY 3/16Rev. G to Rev. H 2/03Rev. B to Rev. C Changed ADM81x to ADM811/ADM812 ................. Throughout Changes to Features Section ............................................................ 1 Change RESET/ Output Voltage Parameter, Table 1 ......... 3 Changes to General Description Section ....................................... 1 RESET Changes to Specifications Section ................................................... 2 Changes to Ordering Guide .......................................................... 10 Removed Note 2 from Ordering Guide .......................................... 3 Changes to Pin Function Descriptions ........................................... 4 3/13Rev. F to Rev. G Removed Note from Table I ............................................................ 6 Changes to Pin 4 Description Table 3 ........................................... 5 Updated Outline Dimensions ......................................................... 9 1/03Rev. A to Rev. B Changes to Ordering Guide .......................................................... 10 Added ADM812 ................................................................. Universal Changes to Specifications ................................................................. 2 8/09Rev. E to Rev. F Changes to Ordering Guide ............................................................. 3 Changes to Ordering Guide .......................................................... 10 Changes to Pin Configuration ......................................................... 4 Changes to Pin Function Description ............................................ 4 5/08Rev. D to Rev. E Additions to Table I ........................................................................... 6 Changes to Table 2 ............................................................................ 4 Changes to Manual Reset section .................................................... 6 Updated Outline Dimensions ......................................................... 9 Changes to Ordering Guide .......................................................... 10 5/02Rev. 0 to Rev. A Deleted ADM812 ................................................................ Universal 5/06Rev. C to Rev. D Changes to Ordering Guide ............................................................ 9 4/99Revision 0: Initial Version Rev. H Page 2 of 12