USB Based Temperature Monitor Using the ADuC7122 Precision Analog Microcontroller and an External Thermistor(AD)

This circuit shows how the ADuC7122 precision analog microcontroller can be used in an accurate thermistor temperature monitoring application. The ADuC7122 integrates a multichannel 12-bit SAR ADC, twelve 12-bit DACs, a 1.2 V internal reference, as well as an ARM7 core, 126 kB flash, 8 kB SRAM, and various digital peripherals, such as UART, timers, SPI, and two I2C interfaces. The ADuC7122 is connected to a 4.7 k? thermistor. Due to the small form factor of the ADuC7122 (7 mm ? 7 mm, 108-ball BGA package) the entire circuit will fit on an extremely small PCB, thus further reducing cost. Similar in function to an RTD, thermistors are low cost temperature sensitive resistors and are constructed of solid semiconductor materials, which exhibit a positive or negative temperature coefficient. Thermistors are inexpensive and have high sensitivity. They detect small variations in temperature, which could not be observed with an RTD or a thermocouple. However, thermistors are highly nonlinear; thus, they are limited to applications with very narrow temperature ranges if linearization techniques are not applied. Circuit linearization techniques can be accomplished in software; however, that will not be discussed here. Despite the powerful ARM7 core and high speed SAR ADCs, the ADuC7122 still provides a low power solution. With the ARM7 core running at 326.4 kHz and the primary ADC active and measuring the external temperature sensor, the entire circuit typically consumes 7 mA. Between temperature measurements, the ADC and/or the microcontroller can be switched off to further save on power consumption.  Figure 1. ADuC7122 Used As a Temperature Monitor Interfaced to a Thermistor (Simplified Schematic, All Connections Not Shown)

Возможности

  • Typical temperature range of -90 C to +150 C
  • Thermistor temperature monitor
  • Single chip solution with ARM 7 processing core

Используемые компоненты

Производитель: Analog Devices Inc.
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