AS1904C31-T

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Power management integrated circuit (PMIC) supervisors are a type of integrated circuits that are designed to provide system level monitoring, reset generation, and power supply sequencing. They are widely used in applications such as overvoltage, overcurrent, and over-temperature protection, and thus perform an important function in the prevention of system damage due to power supply failure or fluctuations. The AS1904C31-T is an example of a PMIC supervisor device, and its application field and working principle are described in this article.

The AS1904C31-T is a 3-pin, 8mm x 8mm, medium-density PMIC supervisor. It has an integrated voltage-level detector, and is capable of detecting input power supply voltages ranging from 2.4V to 11V, with an accuracy of +/- 10%. The device also features an integrated system-level reset generator, capable of generating reset signals with a pulse width of 100ms or 1ms depending on the external capacitor value.

The AS1904C31-T can be used in a variety of applications where system level monitoring and reset generation are required. It is suitable for use in ASICs, FPGAs and microcontrollers, providing overvoltage, overcurrent, and over-temperature protection. The device can also be used in industrial and automotive applications, providing protection against voltage and current spikes, as well as ESD protection.

The AS1904C31-T consists of two separate sections, comprising a voltage-level detector and a system-level reset generator. The voltage-level detector is used to monitor and detect the input voltage, and an optional input voltage range selection voltage. The voltage-level detector serves two functions: the first is to detect any voltages that exceed the adjustable trip thresholds and output a reset signal when they occur; the second is to perform a sequenced comparison of the input voltage and the voltage range selector (VRS) voltage. If the detected voltage is higher than the VRS voltage, the device will assert a reset signal.

The system-level reset generator is used to provide a reset signal when the voltage-level detector detects an overvoltage condition or when the user supplies an externally forced reset signal. The reset generator features low input and output propagation delays, accurate reset pulse width control, and hysteresis for optimal reset threshold control.

The AS1904C31-T is designed to be used in systems where accurate power supply monitoring and reset generation is required. It can be used in a wide range of applications, from automotive to industrial and consumer applications. The device is capable of detecting overvoltage and overcurrent conditions, which can help prevent system damage due to power supply failure or fluctuations, and provides robust protection against ESD and other stress conditions. In addition, its integrated voltage-level detector and reset generator enable easy implementation of advanced power supply monitoring and reset generation, making it an ideal choice for system designers who require a reliable and accurate system-level power management solution.

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