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information and/or support, visit www.analog.com/CN0221. peripherals such as UART, timers, SPIs, and I2C interfaces. detector (RTD). The RTD is used for cold junction compensation. ADuCM361 is greater than 18 bits. Figure 1. ADuCM360/ADuCM361 as a Temperature Monitor Controller with a Thermocouple Interface (Simplified Schematic, All Connections Not Shown) Fax: 781.461.3113 ©2012–2014 Analog Devices, Inc. All rights reserved.
introduced by the RTD self-heating. internal voltage reference was used due to its precision. communications over the UART/USB interface. flash can be reprogrammed through the UART interface. therefore, a PGA is required to amplify those signals. constantan) that has a temperature range of −200°C to +350°C. entire temperature range of the thermocouple. package. This RTD has a temperature variation of 0.385 Ω/°C. converts USB signals directly to the UART. which have an impedance of 1000 Ω at 100 MHz. Techniques, and the ADuCM360TCZ Evaluation Board layout). The PCB used for evaluating this circuit is shown in Figure 2. Figure 2. EVAL-ADuCM360TCZ Board Used for this Circuit
program to the UART, as shown in Figure 3. Figure 3. Output of HyperTerminal Communication Port Viewing Application this is then converted to the final temperature measurement. Figure 4. Error When Using Simple Linear Approximation error using ideal thermocouple voltages. Figure 5. Error When Using Piecewise Linear Approximation Using
52 Calibration Points and Ideal Measurements
Figure 6. Error When Using Piecewise Linear Approximation Using
52 Calibration Points Measured by ADuCM360/ADuCM361
implemented for the RTD the same way as for the thermocouple. temperatures as a function of resistance. and Linearization Using an ADuC706x Microcontroller. debugged via a standard serial wire interface. contact with the actual cold junction instead of on the PCB. the ADuM3160/ADuM4160 isolation devices must be added. and the RTD measurements were evaluated separately. Figure 7. Test Setup Used to Calibrate and Test the Circuit Over Full