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LTC2983- receiving fault error values (0xBC, 0xBD , 0xBE and 0cBF ) in the RX buffer for any resistance provided

Thread Summary

The user is experiencing fault error values (0xBC, 0xBD, 0xBE, 0xBF) when using the LTC2983 to read temperature from a PT100 2-wire sensor, despite successful initialization and start reading process. The final answer suggests mentioning the issue to an Analog Devices support engineer for further assistance. Configuration includes a 5 kΩ sense resistor, 500 μA excitation current, and European curve. The user is using an STM32F446RCT6 MCU.
AI Generated Content
Category: Datasheet/Specs
Product Number: LTC2983

Hello,

I am working with the LTC2983 to read temperature values from a PT100 2-wire temperature sensor. My configuration is as follows:

  • Channel 14: Sense resistor (5 kΩ)
  • Excitation current: 500 µA
  • Curve: European
  • Temperature measurement: Channel 16 via SPI communication

During initialization and conversion (as per the datasheet), I successfully receive:

  • 0x80 for initialization complete
  • 0x40 for start reading process

However, after this, I consistently receive fault error values (0xBC, 0xBD, 0xBE, and 0xBF) in the RX buffer, regardless of the resistance value provided.

What I have tried so far:

  • Different resistance values
  • Using the curves provided in the datasheet
    Despite these attempts, the fault error values persist.

Additional Info:
I am using an STM32F446RCT6 MCU.

Could anyone suggest a specific solution or point out what might be wrong in this configuration?

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