Develop Low Energy Temperature Sensors Using This Reference Design

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Microchip Technology Inc. has released the reference design for MCP960X/L0X/RL0X temperature converters. It converts thermocouple EMF to degree Celsius. It supports integrated cold-junction compensation. The temperature correction coefficients are derived from the National Institute of Standards and Technology(NIST) ITS-90 thermocouple database.

Minimises sensor error

The MCP9600/01 corrects the thermocouple nonlinear error characteristics of eight thermocouple types. It minimises the error of up to ±0.5°C/±1.5°C (Typ./Max.). The MCP960X/L0X/RL0X digital temperature sensor comes with user-programmable registers. It provides design flexibility for various temperature sensing applications.

Adjustable digital filter for transient temperatures

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The registers allow user-selectable settings such as low-power modes for battery-powered applications. It also has an adjustable digital filter for fast transient temperatures. It also features four individually programmable temperature alert outputs which can be used to detect multiple temperature zones.

In addition, the MCP9601/L01/RL01 family provides integrated Thermocouple open-circuit and short-circuit detection features. An alert signal is asserted when the thermocouple wire is broken or disconnected. Similarly, an alert signal is asserted when the thermocouple is
shorted to ground or power.

User-programmable configurations

The temperature alert limits have multiple user-programmable configurations. It includes alert polarity as either an active-low or active-high push-pull output. The device produces output functions as a comparator mode (useful for thermostat-type operation) or interrupts mode for microprocessor-based systems.

Industry-standard two-wire serial interface

In addition, the alerts can detect either a rising or a falling temperature with up to +255°C hysteresis. This sensor uses an industry-standard two-wire and I2C compatible serial interface. It supports up to eight devices per bus. It does so by setting the device address using the ADDR pin.

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High-precision Heat/Cold Meter Reference Design

Four different temperature alerts

The hold and cold junctions have a measurement resolution of +0.0625°C. It consists of four programmable temperature alert outputs. It can monitor hot or cold-junction temperatures and detect the rising or falling temperatures of the system. Additionally, the device features a programmable hysteresis of up to 255°C.

Wide input operating range

The circuit works at an operating voltage from 2.7V up to 5.5V. The device The design supports different low power modes. It has a shutdown mode for low power consumption mode. It also has a burst mode that can record and convert up to 128 samples at a time. The design supports the 2-Wire Interface.

Compatible with I2C interface

The device is compatible with I2C interface at an operating frequency of 100 kHz. The MCP9600/01 supports a maximum of up to eight devices in a single I2C bus. For working in low power modes, the device features an operating current of up to 300uA and a shutdown current of 2uA.

All the designs and documents are available on the Microchip Technology website. The device can be used in many applications including petrochemical thermal management, hand-held measurement equipment, industrial equipment thermal management, commercial and industrial ovens, industrial engine thermal monitor and temperature detection racks.


 

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