Table of Contents
Advertisement
3.2.2 Pressure Sensor Temperature
Starting in the May 2011 timeframe, coefficients for converting 16-bit Pressure Sensor Temperature
values to °C have been appended to the EEPROM contents of new IPT transducers. This supplemental
information allows users, if desired, to separately monitor the temperature of the pressure sensor. The
algorithm is a simple 3
3.2.2.1 Algorithm
Y = g1 + (g2 × t) + (g3 × t
Output: Y = pressure sensor temperature in °C
Inputs: t = 16-bit temperature channel ADC value, normalized 0 – 1:
Normalized temperature channel ADC value = temperature channel ADC value / 65,535
Coefficients (g1, g2, g3 and g4) for the identified algorithm are stored in the IPT EEPROM.
3.2.2.1.1 Horner's Method
Horner's method is a suggested microcontroller-friendly alternative for evaluating the above equation:
rd
order polynomial as described below:
2
3
) + (g4 × t
)
Y = g1 + t(g2 + t(g3 + t(g4)))
(3 multiplies, 3 additions)
14
Advertisement
Table of Contents
