MCP9802A5T-M/OT

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Temperature sensors are an important building block for controlling and monitoring many different systems across a wide range of applications and industries. In this article we\'ll be focusing on the MCP9802A5T-M/OT, an analog/digital output temperature sensor, and detailing its application field and working principle.

Overview

The MCP9802A5T-M/OT, or Microchip Technology\'s MCP9802A5T-M/OT, is a high precision digital temperature sensor that can accurately measure the temperatures from -55 to +125°C, ±2°C accuracy over the entire -55°C to +125°C range. It has a programmable temperature alert interval, with optional alert pin, relative humidity monitoring, and two I2C addresses selectable through address pins. It also features two components, the MCP9802A5T and the M/OT, and has three operating modes: Sleep Mode, Idle-Mode (50μA), and Active-Mode (2.2mA), and has an on-board temperature sensor with a 3-wire interface.

Application Field

The MCP9802A5T-M/OT is used for a variety of temperature-sensitive applications, but it is used most commonly in industrial systems, such as power-supply units, motor control systems, HVAC systems, and medical systems, where dependable and precise temperature measurements are critical. It is also used in more dynamic environments, such as in automotive systems and consumer electronics, because of its robustness.

It is also suitable for measuring the temperature of hot and/or humid environments, including those found in laboratories, greenhouses, water purification systems, and applications that involve testing industrial and medical devices that require highly accurate and wide temperature measurements.

Working Principle

The MCP9802A5T-M/OT is a digital temperature sensor. It uses an as-fabricated transistor active element that is configured in a three-terminal bridge circuit. The bridge circuit is connected to an excitation voltage, which is derived from a temperature reference. When the device is powered, it compares the temperatures between the active element and the reference element, and produces a digital output.

The device also features two I2C serial busses, an address select pin, and a temperature alert pin that can be used to alert the user of critical temperature changes. It also has a dedicated built-in temperature sensor, with a three-wire interface, and up to 7 individually-configurable temperature-alert levels.

Conclusion

The MCP9802A5T-M/OT is an example of a digital temperature sensor that is suitable for applications where temperature accuracy and wide temperature range are required. It can be used to measure temperatures from -55 to +125°C, and features programmable temperature alert intervals, an optional alert pin, and relative humidity monitoring.

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