Thermocouple and Strain Gauge Reference Design
For Freescale Microcontrollers

Measuring tiny signals from sensors in noisy environments is very challenging. Intersil provides an effective solution for a high performance analog front end (AFE) to condition the sensor signal before being processed by a microcontroller. The “Intersil & Freescale Thermocouple and Strain Gauge Reference Design” illustrates two sensor applications using Intersil’s precision and power products coupled with the Freescale Kinetis KL25Z microcontroller. The demo platform consists of two separate boards (a mother board and a daughter board). Please refer to App Note AN1818 for details.

Thermocouple and Strain Gauge Reference Design For Freescale Microcontrollers


  • Limits of Error down to ±0.75% for the Thermocouple
  • Low Noise Sensor Signal Chain
       - Low Noise 24-bit Delta-Sigma ADC
       - Low Noise Chopper Stabilized Zero Drift
       - Low Noise High Performance
         Instrumentation Amplifier
       - Low Noise Voltage Reference
       - Precision Digitally Controlled
  • Power
       - 40V Linear Regular
       - PWM Step-up Regulator and
         Step-down Regulator
       - Voltage Converters
  • Freescale Kinetis KL25Z Microcontroller


  • Industrial controls
  • Thermocouple sensor
  • Weigh scale
  • Strain gauge sensor
  • Temperature monitors & controls
  • Pressure Sensors
  • Instrumentation
  • Data Acquisition Systems
  • Medical Instrumentations


Disclaimer: THIS MATERIAL IS PROVIDED ‘AS-IS’ FOR EVALUATION PURPOSES ONLY.  INTERSIL CORPORATION AND ITS SUBSIDIARIES (‘INTERSIL’) DISCLAIM ALL WARRANTIES, INCLUDING WITHOUT LIMITATION FITNESS FOR A PARTICULAR PURPOSE AND MERCHANTABILITY.  Intersil provides evaluation platforms and design proposals to help our customers to develop products. However, factors beyond Intersil’s control, including without limitation component variations, temperature changes and PCB layout, could significantly affect Intersil product performance. It remains the customers' responsibility to verify the actual circuit performance.

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