For many years now, the supervisory circuit has func-tioned to ensure that microprocessors and microcontrollers operate correctly. Although circuit designers have utilized the most popular supervisor function, the power-on reset, understanding how to select and apply the supervisory circuit is often imprecise. Moreover, improvements to this circuit continue to appear. This article describes the power-on reset and related supervisory functions (such as voltage sequencing, voltage tracking, manual reset, and power-fail and low-line signals), and explains some of the nuances of making them work properly.
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