Thermocouple IC integrates multiple devices on one chip

3rd September 2015

Barney Scott

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Datasheet

Microchip announces the MCP9600, the world’s first thermocouple-conditioning integrated circuit to combine precision instrumentation, a precision temperature sensor and a precision, high-resolution ADC, in addition to a maths engine pre-programmed with the firmware to support a broad range of standard thermocouple types: K, J, T, N, S, E, B and R.

Thermocouples are one of the most ubiquitous temperature-measurement devices, due to their robustness and accuracy in harsh, high-temperature environments, and their ability to measure temperature over an extremely wide range. The MCP9600 simplifies thermocouple designs by integrating a number of discrete devices into one chip, which also lowers board area, cost and power consumption.

Thermocouples are widely used to measure temperature by the designers of industrial, consumer, automotive/aerospace and petrochemical applications, among others. The MCP9600 provides them with the world’s first plug-and-play solution for creating thermocouple-based designs, because it eliminates the design expertise required for a discrete implementation, such as firmware development using an MCU’s maths engine.

Designers no longer have to create precision instrumentation circuitry to accurately measure a thermocouple’s microvolt-level signals, nor do they have to design ADC circuitry for precise temperature calculations. With the MCP9600’s integrated cold-junction compensation, calculating the “Hot” junction temperature of a thermocouple does not necessitate thermal design expertise to precisely measure the reference temperature of the thermocouple’s “Cold” junction.

Other features of the MCP9600 include a temperature-data digital filter, which minimises the effects of temperature fluctuations, system noise and electromagnetic interference. Its shutdown modes reduce overall system power consumption, while its four user-programmable temperature-alert outputs reduce the system microcontroller’s overhead and code space, while further simplifying designs. Finally, the MCP9600 comes in a 5x5 mm, 20-lead mQFN package, which further reduces board area and manufacturing cost.

The MCP9600 Thermocouple IC Evaluation Board (ADM00665), priced at $65.00, has also been announced, to simplify development.

The MCP9600 is available for sampling and volume production, in a 5x5 mm, 20-lead mQFN package.