Keep the Product Working—Microprocessor Supervisors Offer Big Insurance in Small Packages

Abstract: Discusses the value of a µP supervisor reset circuit in a microprocessor-based system. Explains the terms associated with a supervisory circuit and how they should be implemented. Subjects discussed include power-on reset (POR), brownout conditions, and low-power failure. Features discussed include undervoltage/overvoltage detection, manual reset input, power fail comparator, and watchdog timer.

Battery backup circuits with chip enable gating feature also explored. In addition, the document discusses future requirements such as multivoltage systems.