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AD7327 Temperature Indicator (More)

Question asked by spirov on Feb 10, 2017
Latest reply on Feb 22, 2017 by AFrost

I have a question about Figure 46 in the AD7327 datasheet , Rev B .  Our application also uses +/10V range, but our Vcc is 3.3V, not 5V as in said figure.  How does the curve/equation change for Vcc = 3.3V?    Somehow, our software team is using this equation in our product and I don't know where it came from:

temperature in Celsius =  (-1.772)*(decimal value of the 13bit temperature value from TEMP_SENSE register) + 7811.1

[example: -1.772 * 4320 + 7811.11 = 156.07 156.06 C when the TEMP_SENSE register's 13 bits are 1000011100000]

 I'm wondering if your answer to my question will match the mystery equation.


Best Regards,

Spiros Villis