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PMIC - Thermal Management

MCP9843T-BE/MC is a digital thermal sensor embedded in an 8-pin package that is designed for detection of high-performance mobile devices and PCs. It is suitable for thermal management applications in portable devices such as notebooks and cell phones. The MCP9843T-BE/MC is capable of being used as a personal thermal protection unit, to measure the temperature of either a heatsink, air, or any other medium to be monitored.

The MCP9843T-BE/MC has a temperature range of -40°C to +125°C and provides high-accuracy temperature sensing and monitoring. It also uses an I2C communications interface to provide two-wire communication between the device and the system\'s microcontroller. The MCP9843T-BE/MC also features a watchdog timer, which provides reset or interrupt outputs when triggered which can initiate a system shutdown in the event of a temperature excursion.

Features

• Temperature range of -40°C to +125°C.
• ±1°C accuracy over temperature range.
• High and low temperature alert limit settings.
• I2C communications interface.
• Watchdog timer with reset output.

Applications

• Thermal monitoring.
• PCs.
• Notebooks.
• Cell phones.
• Battery charging and protection.
• System management.
• Power management.

Working Principle

The MCP9843T-BE/MC utilizes a temperature measurement principal known as contact current temperature measurement. This principle compares the resistance of a temperature sensing element to a reference resistor with resistance that varies in a known manner with temperature. The resistance of the temperature sensing element is converted, via an operational amplifier circuit, into a replicated output proportional to temperature. The output is then digitized via an Analog to Digital (A/D) converter. The data is then transmitted via an I2C communications port to the microcontroller.

The MCP9843T-BE/MC also includes a watchdog timer that can be programmed to provide an interrupt or system reset output when the temperature exceeds a certain threshold. This is useful for alerting the system of potential thermal issues, and for protecting the device from damage due to excessive temperature.

The data from the MCP9843T-BE/MC can be used as input for a temperature control system or monitored by the system\'s microcontroller to provide thermal protection from excessive temperatures.

Conclusion

The MCP9843T-BE/MC is a digital thermal sensor with a temperature range of -40°C to +125°C and ±1°C accuracy. It offers high-accuracy temperature sensing and monitoring, an I2C communications interface, and a watchdog timer with reset output. It is suitable for thermal management applications in portable devices such as notebooks and cell phones as well as other temperature control applications.

The MCP9843T-BE/MC can be used to monitor temperature levels and can provide thermal protection to prevent device damage. By using the MCP9843T-BE/MC, designers can create safe, reliable, and cost-effective thermal control systems.

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