This reference design shows the operation of Renesas' precision products in a temperature sensor application. The application uses Renesas' data acquisition (DAQ) on a stick reference design that has been modified to work with a Semitec 103AP-2 RTD temperature sensor. The system operates over the temperature range of -60 °C to +150 °C. It has an accuracy of ±1 °C or better.
The reference design is a self-contained demo showing a complete signal chain solution from the Semitec sensor to the signal conditioning components consisting of a Vishay precision resistor and Renesas precision parts, a Renesas RL78/G1C microcontroller and a graphical user interface (GUI). The image to the right shows the DAQ on a stick connected to the external Semitec temperature sensor.
The complete reference design is conveniently housed in a USB stick form factor with plug-in connection for the temperature sensor. This compact design draws power through the USB port and uses a GUI to display the real-time temperature readings from the temperature sensor onto the computer.
The image below shows a simplified block diagram of the temperature sensor design. The design uses a Semitec 103AP-2 thermistor, a Vishay Precision Group 500Ω ±0.1% precision resistor, Renesas' ISL28634 instrumentation amplifier (in amp), ISL21090 2.5V precision voltage reference, ISL21010 4.096V precision voltage reference, ISL21010 3.3V precision voltage reference, the ISL26104 24-bit Delta-Sigma converter, ISL22316 digitally controlled potentiometer (DCP), and an R5F10JBC (RL78/G1C) microcontroller.
The installation application includes the following items:
- GUI software
- Desktop shortcut for easy access
- Application note and schematics
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Disclaimer: THIS MATERIAL IS PROVIDED “AS-IS” FOR EVALUATION PURPOSES ONLY. RENESAS ELECTRONICS CORPORATION AND ITS SUBSIDIARIES (collectively, “Renesas”) DISCLAIM ALL WARRANTIES, INCLUDING WITHOUT LIMITATION, FITNESS FOR A PARTICULAR PURPOSE AND MERCHANTABILITY. Renesas provides evaluation platforms and design proposals to help our customers to develop products. However, factors beyond Renesas' control, including without limitation, component variations, temperature changes and PCB layout, could significantly affect the product performance. It is the user’s responsibility to verify the actual circuit performance.
- Self-contained demo platform
- 24-bit ADC with programmable sample rate
- Zero-drift amplifiers
- Real-time graphing on a GUI
- Accuracy of ±1 °C or better for a range of -60 °C to +150 °C