HP203B Datasheet, PDF (5/18 Pages) List of Unclassifed Manufacturers – PRECISION BAROMETER AND ALTIMETER SENSOR

DataSheet
HP203B
3.4 Sensor Output Conversion
For each pressure measurement, the temperature is always being measured prior to pressure
measurement automatically, while the temperature measurement can be done individually. The
conversion results are stored into the embedded memories that retain their contents when the device
is in the sleep state.
The conversion time depends on the value of the OSR parameter sent to the device within the
ADC_CVT command. Six options of the OSR can be chosen, range from 128, 256 … to 4096. The
below table shows the conversion time according to the different values of OSR:
Table 5: Conversion Time VS OSR
Conversion Time (ms)
OSR
Temperature
Temperature and
Pressure (or ltitude)
128
2.1
4.1
256
4.1
8.2
512
8.2
16.4
1024
16.4
32.8
2048
32.8
65.6
4096
65.6
131.1
The higher OSR will normally achieve higher measuring precision, but consume more time and
power.
The conversion results can be compensated or uncompensated. The user can enable/disable
the compensation by setting the PARA register before performing the conversions.
3.5 Altitude Computation
The device can compute the altitude according to the measured pressure and temperature. The
altitude value is updated and available to read as soon as the temperature and pressure
measurement is done.
4. Access Modes & Commands
4.1 Operation Flow
During each power-up/reset cycle, the device will only perform one calibration. After that it will enter
the SLEEP state waiting for any incoming commands. It will take actions after receiving different
proper commands, and re-enters the SLEEP state when it finishes the jobs.
4.2 Command
The Command Set (Table 6) allows the user to control the device to perform the measuring, results
reading and the miscellaneous normal operations.
HP203B_DataSheet_EN_V2.0
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