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Application NoteNxp

NXP AN13209: RT500 ADC Temperature Sensor Usage

Technical guide for using the integrated RT500 temperature sensor via the ADC controller, covering register setup, calculation formulas, and MIMXRT595EVK implementation.

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Overview

This application note provides a technical overview of implementing the built-in temperature sensor in NXP RT500 microcontrollers using the ADC controller. The internal sensor is mapped to ADC input channel 7 and utilizes a pn-junction diode to produce a Complement To Absolute Temperature (CTAT) voltage output. The document outlines the sensor's characteristics, including an operating range of -40°C to +105°C with ±5°C accuracy. It details necessary register configurations for SYSCTL0 and PDRUNCFG, as well as ADC settings for differential mode and sample timing. A demonstration project using the MIMXRT595EVK and MCUXpresso SDK is included to illustrate the conversion of ADC results into ambient temperature values using linear-least-square formulas.

Use Cases

  • Internal device temperature monitoring
  • Thermal management in embedded systems
  • ADC configuration for internal sensor measurement
  • Validating RT500 hardware using SDK demo software

Topics

NXP
RT500
MIMXRT595
MIMXRT595EVK
ADC
Temperature Sensor
CTAT
SYSCTL0
MCUXpresso SDK
Application Note

Referenced Parts

MIMXRT595EVK

NXP

Board — MIMXRT595EVK

MIMXRT595

NXP

Getting Started with MCUXpresso SDK for MIMXRT595 (available inside SDK)

MIMXRT685

NXP

SDK\boards\evkmimxrt685\driver_examples\lpadc\temperature_measurement

SYSCTL0_PDRUNCFG0_ADC_TE

MPS

SYSCTL0->PDRUNCFG0_CLR = SYSCTL0_PDRUNCFG0_ADC_TEMPSNS_PD_MASK;

SYSCTL0_TE

MPS

2.3.1 Temperature sensor control (SYSCTL0_TEMPSENSORCTL)

NXP AN13209: RT500 ADC Temperature Sensor Usage | Design Resources