DS1708ESA/T&R

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Power Management Integrated Circuit (PMIC) components are widely used in a variety of applications, from consumer electronics to industrial applications. One of the most important PMIC components is the Supervisors, or system supervisors, which provide integrated monitoring and adjustable reset signals for CPU and power system designs. The Dallas Semiconductor DS1708ESA/T&R is an example of one such supervisor. This application note will discuss its application field and working principle.

The DS1708ESA/T&R is used to monitor power supplies in microprocessor-based systems, and to generate the reset signals required in such systems. The supervisor provides an adjustable timeout delay that allows the system design to respond quickly to system events. The adjustable timeout delay can be used to help to minimize power-on-reset (POR) time in applications that require faster response times.

The DS1708ESA/T&R provides several features that make it suitable for many applications. It has an open-drain reset output, a slew rate-limited input/output, and a precision voltage reference. It also features overvoltage, undervoltage, and thermal-shutdown protection. With these features, it can be used to monitor both input and output voltage levels, and provide reset protection from a wide range of system failure conditions.

In terms of operation, the DS1708ESA/T&R works by providing an adjustable, open-drain reset output that is triggered when the voltage drops below a predetermined threshold. The timeout delay is adjustable and can be set to respond to as quickly as 1 µs or as slowly as 16 s. Once the reset output is triggered, the supervisor immediately brings the reset output to a logic-low state and keeps it there until the voltage rises back above the threshold.

The DS1708ESA/T&R is also equipped with an internal, adjustable voltage threshold circuit. This allows the supervisor to be used to monitor both input and output voltages. The supervisor also features an adjustable slew rate-limited input/output, allowing the device to provide an output voltage that is limited to a predetermined maximum. This feature helps to protect system components from overvoltage transients.

Finally, the DS1708ESA/T&R is equipped with a precision voltage reference. This ensures that the supervisor provides reliable, accurate monitoring of the system supply voltages. The voltage reference also helps the supervisor remain immune to the effects of noise, supply voltage variations, and EMI.

As can be seen, the DS1708ESA/T&R is a robust and reliable power management IC that is well-suited for a number of applications. Its adjustable timeout delay and overvoltage, undervoltage, and thermal-shutdown protection make it suitable for a wide range of systems. It is also equipped with a precision voltage reference, which helps to increase its accuracy and consistency. All of these features make the DS1708ESA/T&R ideal for use as a system supervisor.

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