AS1906C28-T

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AS1906C28-T is a fully integrated supervisory circuit that monitors and supervises the activity of power supplies, services, and systems. It combines functions for monitoring system power supply voltages, supply sequencing, temperature sensing, and fan speed monitoring. It has five power supply operations that are monitored, including power-on reset (POR), power-good (PG), reset time guard (RTG), system Activity (SYSA), and three open-drain signals that are used to control a system. AS1906C28-T is often used in devices such as laptops, desktops, servers, routers, digital media, automotive infotainment, medical, consumer electronics, and other digital systems.

The AS1906C28-T supervisory circuit works by sensing the voltage across its power supply pins (VCCA, VCCB and/or VDD) and monitoring its status. When the voltage is below a pre-configured threshold, the AS1906C28-T generates a reset pulse. If the voltage is above the pre-configured threshold, the AS1906C28-T generates a power-good signal. It also has an open-drain reset output that is controlled by the AS1906C28-T. This helps eliminate false reset signals.

The AS1906C28-T can be used in a variety of applications, including:

• PCs, Servers, and Routers: It can monitor microprocessor (CPUs) supply voltages, such as +12V, +5V and +3.3V.
• Consumer Electronics: It can be used to monitor voltage rails of devices such as TV sets and game consoles.
• Industrial Control: It is used to monitor supply voltages of industrial control systems such as PLCs and SCADA systems.
• Medical: It is used to monitor voltage rails of medical systems such as heartrate monitors and X-Ray machines.
• Automotive: It is used to monitor voltage rails of automotive systems such as infotainment systems and engine control systems.

The AS1906C28-T supervisory circuit also provides several optional functions. These include delayed power-on reset, selectable reset time, automatic reset time guard, system Activity (SYSA), and NMI (non-maskable Interrupt). The power-on reset delay is configurable and helps ensure that the system is stable before the reset pulse is generated. The selectable reset time selects the length of the reset pulse and the reset time guard prevents incorrect reset. The system Activity feature monitors the activity of the system and activates the reset when a predefined activity level is exceeded. Finally, the NMI feature generates a non-maskable interrupt when the reset pulse is generated.

In short, the AS1906C28-T supervisory circuit is a reliable and efficient solution for monitoring, supervising, and controlling the power supplies, services, and systems found in a variety of digital devices. With its advanced features and extensive operational range, it can be used in applications ranging from computers, routers, and servers, to medical, automotive, and consumer electronics.

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