MAX792MESE+

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Introduction

The MAX792MESE+ is a specialized voltage supervisor integrated circuit (VSI) from Maxim Integrated Products, Inc., widely used for monitoring voltage and playing a critical role in the protection or reset of microcontroller (MCU) based systems. It features two independent supervised capacitor-programmable thresholds, adjustable reset output delay, a push-pull active-low reset output, and low-power consumption.

Function and Application Field

The devices are widely used to guard against sudden voltage surges and drops and to ensure orderly restarting in the presence of serious system mistakes. They are commonly found in automotive systems, such as powertrains, centralized body controllers, and computers, as well as other applications, such as high-end internet routers, storage systems, and industrial equipment.

The MAX792MESE+ provides a function that allows it to detect a power loss on one of its controlled supply voltage lines and initiate a reset signal suitable for microcontroller-based systems. This reset signal can be used to reset the system or force the system into an inactive state. The reset signal can also be used to turn off other components on the board or to save important data gathered prior to the power loss.

Working Principle

The MAX792MESE+ contains two independent voltage supervision circuits. Each of these circuits consists of two comparators. The first one is referenced to ground and compares the voltage between pins 4 and 6 to a single RAMP voltage calibration. The second comparator is a window comparator, with the reference voltage of the lower limit at pin 8 and the reference voltage of the upper limit at pin 10. When the voltage at pins 4 and 6 is within the predefined limits set by pins 8 and 10, the output of the MAX792MESE+ is reset low.

When the voltage at pins 4 and 6 is at or below the reference voltage at pin 8, the output of the MAX792MESE+ remains reset low. If the voltage at pins 4 and 6 is above the reference voltage at pin 10, the output of the MAX7921MESE+ goes high. This can be used as a signal to reset and/or power off the system.

The MAX792MESE+ can also be used to provide a reset signal when the output from a power supervisor IC goes low. In this configuration, pin 2 of the MAX792MESE+ can be connected to the output of the power supervisor and configured as a comparator so that it trips when the power supervisor output is low.

Conclusion

The MAX792MESE+ is a specialized voltage supervisor integrated circuit commonly used for monitoring voltage and playing a critical role in the protection or reset of MCU-based systems. It offers a reset signal suitable for microcontroller-based systems, can detect a power loss on one of its controlled supply voltage lines, and can provide a reset signal when the output from a power supervisor IC goes low. Its two independent voltage supervision circuits each consist of two comparators, allowing it to compare the voltage between pins 4 and 6 to a single RAMP voltage calibration, and also offer a window comparator with predefined limits set by pins 8 and 10. The MAX792MESE+ is widely utilized in automotive systems and other applications such as high-end internet routers, storage systems, and industrial equipment.

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