**ADM1066ASU: A Comprehensive Guide to Microprocessor Supervisory Circuits and Power Supply Sequencers**

In the world of complex electronic systems, ensuring reliable power-up and power-down sequences is paramount. The **ADM1066ASU** from Analog Devices stands as a sophisticated and highly integrated solution, designed to supervise and manage multiple power supply voltages in advanced microprocessor-based systems, such as servers, telecom hardware, and networking equipment.

The core function of the ADM1066ASU is to act as a **programmable power supply sequencer and supervisor**. It monitors up to ten system power supply voltages, ensuring they remain within specified tolerance limits. If any supply drifts beyond its predefined window, the device can initiate a system reset or a controlled shutdown, thereby protecting sensitive components from operating under unstable or out-of-spec conditions, which is **critical for system integrity and data protection**.

A key differentiator of this IC is its high degree of programmability. Unlike simpler supervisory circuits with fixed thresholds, the ADM1066ASU is configured via an industry-standard SMBus serial interface. This allows designers to **precisely set voltage thresholds, adjust timing delays, and define complex power-up sequences** tailored to the specific requirements of an FPGA, ASIC, or multi-core processor. The sequencer ensures that supplies turn on and off in a specific order, preventing latch-up and excessive inrush currents that could damage components.

The device integrates **ten analog-to-digital converters (ADCs)** for accurate voltage monitoring, two programmable push-pull outputs, and an open-drain reset output. It also features nonvolatile memory (NVM) to store custom configuration settings, eliminating the need for external components and simplifying board design. Its ability to provide detailed status information and fault logging over the SMBus makes it an invaluable tool for system diagnostics and debugging.

**ICGOOODFIND**: The ADM1066ASU is an essential component for designing robust and reliable high-performance electronic systems. Its integration of monitoring, sequencing, and programmability into a single package simplifies design complexity, enhances system safety, and ensures compliance with the strict power sequencing requirements of modern processors.

**Keywords**: Power Supply Sequencer, Voltage Supervisor, Programmable Threshold, System Monitoring, SMBus Interface.