AS1902C31

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Type:	Simple Reset/Power-On Reset
Number of Voltages Monitored:	1
Output:	Push-Pull, Totem Pole
Reset:	Active High
Reset Timeout:	60 ms Minimum
Voltage - Threshold:	3.08V
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	TO-236-3, SC-59, SOT-23-3
Supplier Device Package:	SOT-23-3

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AS1902C31 PMIC - Supervisors

PMIC (Power Management Integrated Circuits) supervisors are essential for controlling the power on a circuit board. Supervisory circuits are used to monitor the voltage levels on the circuit and switch off or reset the circuitry when a fault or other condition is detected. The AS1902C31 PMIC Supervisory Circuit is a 3-pin solution to a wide range of problems in power-related applications. The device is designed to reduce system costs by eliminating the need for discrete components, while providing high reliability and compactness.The AS1902C31 PMIC Supervisor consists of an internal oscillator which sets up a programmable frequency. This frequency drives a comparator which compares the input voltage to the reference voltage. The comparator output is monitored by an external capacitor connected between the comparator output and ground. Once the capacitor gets charged to a preset level, the microprocessor takes the appropriate steps to shut down the system.The most common application of the AS1902C31 is in the protection of computer CPUs from overvoltage and/or undervoltage conditions. It is designed to detect an overvoltage condition (generated by a sudden spike in the power line) and shutdown the system. It is also designed to detect an undervoltage condition (caused by the sudden power loss) and automatically restart the system. The AS1902C31 is particularly useful for the protection of high-end CPUs, such as those found in server systems, as it supports several different levels of protection.The AS1902C31 PMIC Supervisor is also a popular choice for applications requiring a reset function, such as network equipment, medical equipment, and operating systems. These applications typically require a reset to be triggered when asserted by either an internal or external signal. The AS1902C31 is designed to detect a reset condition when either a high or low level is detected on the reset input. When a reset condition is detected, the device will initiate the reset sequence via an output pin connected to the appropriate circuit.The AS1902C31 also provides a frequency tracking mode for applications where the frequency of the system must be precisely maintained for optimal operations. In this mode, the microprocessor is allowed to sample the input voltage and make any necessary adjustments to keep the frequency of the system constant within a specific range.Finally, the AS1902C31 can be used in applications where the input voltage must be monitored for both low-level and high-level events. This feature is especially useful for monitoring of power supplies and is ideal for applications such as telecom and datacom equipment.In conclusion, the AS1902C31 PMIC Supervisor is an excellent choice for a wide range of power management applications. It is a reliable, cost effective solution as it eliminates the need for discrete components, while providing several different protection levels and a reset function. The device also offers several useful features, such as frequency tracking and voltage monitoring, making it a great choice for many applications.

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