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PGA309EVM-USB: the data below 0°C cannot be written into EEPROM

Part Number: PGA309EVM-USB
Other Parts Discussed in Thread: PGA309

Hi Team,

PGA309EVM-USB EVM and sboc320c are being used.

The customer is testing with the three temperature (-40°C, 25°C, 70°C) calibration process of the PGA309, the hardware is in current loop mode and is sampled using the internal TEMP ADC.

Issue: Data below 0°C cannot be written to EEPROM, calibration data above 0°C is normal. 

Could you please help check this case? Thanks.

Best Regards,


  • Cherry,

    It is important to determine: 1) is the issue that data is corrupted when written at cold temperature, or 2) is the calibration data at cold temperature incorrect?  Do you have confirmation that you attempted to write a particular data byte into the EEPROM (for example 0xC4), and you actually wrote something different (for example 0xF3).  On the other hand, do you have a valid checksum and valid table data, but the device behaves well above 0C and poorly below 0C?

    I think it is unlikely that you hare having data communications errors below 0C if the hardware follows the recommendations in the data sheet.  If you think there is a data communications error connect a scope between the PGA309 and EEPROM at cold temperature and show the waveforms.

     I hope that your investigation on these items can help us to quickly resolve your issues.

    Best regards, Art