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MPL115A2 Coefficients

Question asked by Ben Griffiths on Feb 19, 2019
Latest reply on Feb 22, 2019 by Ben Griffiths

I've just started experimenting with the MPL115A2 Digital Barometer.

 

Maybe I’m having a bad day – but I can’t understand how to convert the Coefficient integers / binary values into numbers.

 

The data sheet doesn’t seem to make sense. For example a0 is defined as

 

a0 Signed, Integer Bits = 12, Fractional Bits = 3 : Coeff a0 = S I11 I10 I9 I8 I7 I6 I5 I4 I3 I2 I1 I0 . F2 F1 F0

 

Later the data sheet uses the example a0 = 0x3ECE = 2009.75

 

Maskign out - bits I11 to I0 gives 2009 - but the last 3 bits (the fractional bits) are 0x06 - I can't see how that taken to be 0.75?

 

Are there any examples of how to take these Coefficients in binary/hex form and convert them into actual numbers?

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