MAX815TEPA+

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Integrated circuits (ICs) are critical components of all kinds of systems, and power management integrated circuits (PMICs) are especially important. PMICs not only supply power to droven devices, but also detect and control the state of the system or individual processes. The MAX815TEPA+ is a low-power microprocessor reset supervisor, giving designers an integrated solution for controlling the reset states of their designs.

The MAX815TEPA+ belongs to a family of supervisory circuits. As its name implies, these circuits monitor the voltages in a system and provide reset when appropriate. They are designed to maintain system stability, reset the processor, and provide an indication of power failure. The MAX815TEPA+ meets these needs in a tiny package. It takes only a few milliamps of current, requires minimal external components and offers low voltage, robust protection.

Applications:

The MAX815TEPA+ is ideally suited for providing reset control and power-fail indication in battery-powered and space-constrained applications. It is well suited for designs that are powered by a variety of battery types, as the device has an adjustable reset threshold voltage. It is suitable for use in a wide range of consumer, industrial and medical systems, including cell phones, handheld devices, medical devices and embedded systems.

Working Principle:

The MAX815TEPA+ is designed to protect the microprocessor from incorrect startup or undesired operations. It is based on a reset output generator with a high-gain comparator , which resets the microprocessor when the voltage level falls below the reset threshold. The reset output is usually held for 150ms after the supply voltage reaches the reset threshold. The reset threshold is adjustable and can be set from 1.25V to 5V with an external resistor. In addition, the MAX815TEPA+ features an active-low reset output that provides an indication of the power status. The reset output switches low when the Vcc voltage drops below the reset threshold and remains low until Vcc rises above the reset threshold. The PWRFAIL output is also active-low and switches low when Vcc drops below the reset threshold. This output is used to indicate a power failure condition.

The MAX815TEPA+ also features an under-voltage lockout (UVLO) that monitors the Vcc voltage to prevent the device from accidentally activating. This is useful in battery-powered applications, as the device will not operate when the battery level is low. Additionally, the MAX815TEPA+ has a built-in temperature compensation circuit that compensates for temperature variations, as well as an internal oscillator to generate the periodic reset pulse. It also provides a manual reset input that can be used to reset the microprocessor if desired.

The MAX815TEPA+ is an ideal solution for reset control and power-fail indication in microprocessor-based applications. It offers a small package, low-current operation, minimal external components and robust reset protection. It is a cost-effective solution that can be used in a wide range of applications.

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