Precision Analog Output Temperature Sensing with the Microchip MCP9701A-E/TO Linear Active Thermistor IC

In the realm of temperature measurement, achieving a simple yet accurate and reliable solution is a common design challenge. The Microchip MCP9701A-E/TO addresses this need effectively, offering a robust analog output temperature sensing solution that stands out for its ease of use and integrated design.

Unlike traditional negative temperature coefficient (NTC) thermistors, which require complex signal conditioning circuits and linearization algorithms, the MCP9701A is a linear active thermistor IC. This key distinction means the device provides a voltage output that is directly proportional to the measured temperature, significantly simplifying the interface with a microcontroller's analog-to-digital converter (ADC). The device features a low operating voltage range from 2.3V to 5.5V, making it ideal for a wide array of battery-powered and low-power embedded applications.

Housed in a rugged TO-92 package, the MCP9701A-E/TO delivers a typical accuracy of ±2°C from 0°C to +70°C and ±4°C across a broader range of -40°C to +125°C. Its linear transfer function of 10.0 mV/°C allows for straightforward temperature calculation in the digital domain: simply digitize the output voltage, subtract the 0°C offset of 500 mV, and divide by the 10 mV per degree Celsius scale factor. With a quiescent current of just 12 µA (typical), it introduces minimal load on a system's power supply, which is critical for portable and always-on devices.

Typical applications extend across consumer electronics, HVAC systems, industrial process control, and environmental monitoring systems. Its analog output provides a simple, low-latency measurement, making it suitable for systems where a direct gauge reading is needed or where a microcontroller can easily process the signal.

ICGOODFIND: The MCP9701A-E/TO is an exemplary solution for designers seeking to eliminate the calibration and linearization headaches associated with NTC thermistors. Its integrated, low-power, and linear-vout architecture provides a superior blend of precision, simplicity, and power efficiency.

Keywords: Linear Active Thermistor, Analog Temperature Sensor, Low-Power Operation, TO-92 Package, Voltage Output.