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August 2015
DocID010449 Rev 2
1/25
www.st.com
AN1957
Application note
Microprocessor supervisor functions
Introduction
Designers of microprocessor systems have to achieve high reliability, in the face of a large number of
threats to stability or even correct functioning (such as voltage drops, glitches, long ramp-up times,
programs stuck in endless loops, etc.).
Supervisor circuits from STMicroelectronics provide highly effective solutions for minimizing the risks of
system failure and for ensuring the safe running of the system at a low cost. The members of the ST
supervisor family offer various combinations of functions.
This application note describes the main supervisor functions and features, to help the user to
understand their principles and the advantages of using them, through the description of waveforms,
recommended values, and hardware hookup diagrams.
Overview of ST supervisors
Microprocessor supervisors
• STM705, STM706, STM706T/S/R, STM707, STM708, STM708T/S/R, STM813L, STM706P,
STM6321L/M, STM6321T/S/R, STM6821L/M, STM6821T/S/R, STM6823L/M, STM6823T/S/R,
STM6824L/M, STM6824T/S/R, STM6825L/M, STM6825T/S/R
Microprocessor supervisors with switchover
• STM690A, STM692A, STM690T/S/R, STM802L/M, STM802T/S/R, STM703, STM704,
STM704T/S/R, STM806T/S/R, STM805L, STM805T/S/R, STM804T/S/R, STM817L/M,
STM818L/M, STM819L/M, STM795T/S/R
This application note is dedicated to the microprocessor supervisor and microprocessor supervisor with
switchover families.
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