Copyright © Parallax Inc. Altimeter Module MS5607 (#29124) v1.0 11/3/2011 Page 4 of 5
Theory of Operation
The MS5607 consists of a piezo-resistive sensor and a sensor interface IC. The main function of the
MS5607 is to convert the uncompensated analogue output voltage from the piezo-resistive pressure
sensor to a 24-bit digital value, as well as providing a 24-bit digital value for the temperature of the
sensor.
For details on pressure and temperature calculations, please refer to the data sheet and to application
note #501 located on the 29124 product page at www.parallax.com.
In order to obtain best accuracy over temperature range, particularly in low temperature, it is
recommended to compensate the non-linearity over the temperature. For a full description and flow chart
on setting up this compensation, see page 9 of the datasheet located on the Altimeter Module’s product
page at www.parallax.com.
Pressure Output Characteristics (VDD = 3V, T = 25°C)
Parameter Conditions Minimum Typical Maximum Unit
Operating Pressure
Range
Full Accuracy 300 1100
mbar
Extended Pressure
Range
Linear Range of ADC 10 1200
Total Error band,
no autozero
at 25°C, 700..1100 mbar
at 0..50°C, 300..1100 mbar
at -20..85°C, 300..1100 mbar
at -40..85°C, 300..1100 mbar
-1.5
-2.0
-3.5
-6.0
+1.5
+2.0
+3.5
+6.0
Total Error band,
autozero at one
pressure point
at 25°C, 700..1100 mbar
at 0..50°C, 300..1100 mbar
at -20..85°C, 300..1100 mbar
at -40..85°C, 300..1100 mbar
-0.5
-1.0
-2.5
-5.0
+0.5
+1.0
+2.5
+5.0
Resolution RMS
Oversampling Ratio (OSR)
4096
2048
1024
512
256
0.024
0.036
0.054
0.084
0.130
Long-term stability -1 mbar/yr
Table data is taken from the MS5607 datasheet.
Temperature Output Characteristics (VDD = 3V, T = 25°C)
Parameter Conditions Minimum Typical Maximum Unit
Absolute Accuracy
at 25°C
-20..85°C
-40..85°C
-0.8
-2.0
-4.0
+0.8
+2.0
+4.0
°C
Resolution RMS
Oversampling Ratio (OSR)
4096
2048
1024
512
256
0.002
0.003
0.005
0.008
0.012
Table data is taken from the MS5607 datasheet.
