AS1911S-T

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AS1911S-T, commonly known as "Supervisors" in Power Management Integrated Circuit (PMIC) industry, is a type of integrated circuit that functions as a watchdog timer, resetting itself or the system when necessary to ensure reliable operation of the application circuit. Supervisors are typically programmed to monitor the proper functioning of an embedded system, providing an asynchronous reset signal in case of improper operation. This helps ensure reliable circuit operation, preventing system malfunctions and unexpected behavior.

The AS1911S-T, specifically, is a positive-triggered reset supervisor voltage supervisor that is characterized by a wide supply range (1.4 V to 5.5 V) and low quiescent current consumption for both high, medium, and low pin-count applications. The AS1911S-T features a reset signal assertion that is guaranteed to be held for a minimum of 140 ms. The assertion maintains a valid voltage level from falling below the reset threshold. The AS1911S-T also includes adjustable active-low or open-drain reset output. In addition to its reset output, the supervisor provides a push/pull signal that indicates when reset is asserted.

In terms of application fields, the AS1911S-T is primarily used in consumer, automotive, and industrial applications. It can be used in consumer-facing products such as cell phones, set-top boxes, digital cameras, audio devices, gaming consoles, and more. The supervisor is designed to protect components in these high-reliability applications, as well as in critical automotive and industrial locations. The AS1911S-T is housed in a six-pin, dual-function surface-mount package that allows for installation in limited areas.

The AS1911S-T contains several internal circuitry including an oscillator, voltage references, comparators, latch, and reset driver circuits. The supervisor monitors the supply voltage of a circuit to make sure it stays within the programmed range. It is typically used on industrial monitoring circuits and embedded systems.

The AS1911S-T oscillator starts after the power supplies exceed the user-selected reset threshold. It begins to operate as soon as the supply voltage reaches the threshold and oscillates as long as it remains within the programmed range. When the power supply drops below the reset threshold, the oscillator will stop, triggering the internal reset signal. This reset signal will remain active until the power supply voltage returns to its normal range.

The AS1911S-T can also be used in a power-fail reset mode. In this mode, it monitors the power supply and asserted a reset signal in the event of a power supply failure. This reset signal is then sent to the primary processor to reset the system. The AS1911S-T also has a microprocessor-controlled power-up/power-down sequencing that provides order management in the system.

Finally, the AS1911S-T also features a couple of special features. These include a “Dual 100 ms” reset option, which allows the application to implement two separate reset times for each environment based on the selected reset sources (Power-On Reset, Watchdog Timer), and an Adjustable Reset De-assert Time (PDRTD) feature. This feature enables the user to program the de-assert time depending on application expectations, allowing an extra margin of safety.

In conclusion, the AS1911S-T is a reliable integrated circuit which is ideally suited for a variety of applications requiring a reliable power-fail reset system. By containing a wide supply range, low quiescent current consumption, as well as a variety of additional features, the AS1911S-T solutions streamline design and shorten development time for applications in the most competitive markets.

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