MAX694EPA+

MAX694EPA+ Application Field and Working Principle

Maxim Integrated\'s MAX694EPA+ is a low power reset supervisor monitoring voltage supply and resetting them in the event of a brown-out. This chip is mainly intended to be used in applications requiring reliable system control and reset from an RTL or TTL signal. The MAX694EPA+ possess a wide range of features designed for fault-protection and operational stability in stabilized system supply and reset operations.

Applications

The MAX694EPA+ is used in a wide variety of industrial and medical applications, although primarily due to its low power operation and solid reset operation. It is also capable of handling a wide supply range, making it a popular choice among engineers requiring reliable fault protection. Typical application areas include:

• Industrial Automation Systems
• Low and High Voltage Detection
• Consumer Electronics
• Computer and Network Systems
• Security and Medical Equipment

Features

The MAX694EPA+ is an advanced version of the MAX694/MAX695 reset supervisors and provides a number of useful features not available on the earlier chips. It offers an extremely low quiescent current supply at 160nA and can support 1.5V voltage levels with a reset pulse length of 550ms or 1.0V at 1ms. In addition, it is backwards compatible with the earlier MAX603/MAX604 reset supervisors.

The MAX694EPA+ is able to reset itself in the event of an overtemperature event and offers an adjustable reset threshold and dual reset outputs. It is also able to provide a reset signal during each start-up cycle. This chip also features an active-low reset input and provides various levels of glitch immunity. Furthermore, it is RoHS compliant and offers a shut down mode of operation for when the chip is not in use.

Working Principle

The MAX694EPA+ works on the principle of monitoring the voltage supply through a circuit, that when voltage falls below a preset threshold, a reset signal is sent in order to restore normal system operation. When the voltage drops below the threshold, the chip\'s internal circuitry generates a reset effect on the reset output pins. In most reset supervisor implementations, the MAX694EPA+ will reset the system, followed by a period of low power operation as the voltage stabilizes.

As mentioned above, the MAX694EPA+ has the ability to reset itself in the event of an overtemperature event. In this case, an internal temperature sensor used to detect when the temperature exceeds a specified threshold. The chip will then reset itself, effectively restarting the system in order to avoid further damage.

The MAX694EPA+ is a reliable and highly efficient reset supervisor chip, offering a wide range of features designed to provide maximum system stability. It is capable of handling a wide supply range and is suitable for applications requiring reliable fault protection. Its low power operation and solid reset operation make it an ideal choice for industrial and medical applications.