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PGA309 temperature Coefficients Write issue

huo lifeng
Prodigy 60 points
Other Parts Discussed in Thread: PGA309EVM-USB, PGA309

I  used  PGA309EVM-USB board in my application, the software is sboc320c 

 I found something wrong but i can't find out it.The issue:

      I compensate the PGA309 with 3 temperature point -40,0,60.     the Temp ADC may be 0xFF60,  0x0000,0x0078

    the temperature reg6 set as 1600,9-Bit + Sign, Right-Justified, Sign-Extended, Twos Complement,0.5°C (3ms)

just you can see from the E2PROM picture below

but when I finish the compensate , the E2PROM value just like this just like the picture below

the T1 ~T5 are 0x0000, the T6 is 0x 003 and the T6  to T16 is increasing but I can't find the FF60 and can't find the temperature below 0, what had happened when during wite the E2PROM,I doubt any bug in 320C software?

   

  • 0
    Prodigy 60 points

    I compensated the PGA309 ant -10 degree, just like the picture up

    but at the end of compenstate, The E2PROM datas just like the picture below,all the T0~T16 are 0x0000.

    but the problem did not happen where temperauure is higher to 0.

    obiously the PGA309 software has some bugs ,no one meet this problem?

  • 0 in reply to huo lifeng
    TI__Mastermind 27715 points

    Hello Huo,

    Right now it looks like your calibration is unsuccessful due to an improper configuration. You are getting improper values for your VOUT max and min, and the temp ADC is not reading good temperature data, so it makes sense that the EEPROM is not being written correctly.

    If you're using the EVM, I recommend testing with Register 6 = 1403h. This configures the Temp ADC for external signal mode with the signal applied to the TEMPIN pin. This is how the EVM is intended to be used with the built-in sensor and temperature emulator signals.

    I've attached an example pre-cal file and model file you can use to get this configuration.

    Best regards,

    Ian Williams
    Linear Applications Engineer
    Precision Analog - Op Amps

    PGA309EVM Configuration Files.zip
  • 0 in reply to Ian Williams
    Prodigy 60 points

    Dear Ian Williams

         thank you for your help

       followed your advise,   I set reg6=1403 ,and  set external Temp sensor to   the TEMPIN pin, then I do the experiment under 0 degree,and all the data can write to the E2PROM.