HP203B Datasheet, PDF (13/18 Pages) List of Unclassifed Manufacturers – PRECISION BAROMETER AND ALTIMETER SENSOR

DataSheet
HP203B
number and its unit is in 0.02 mbar. When setting the pressure thresholds, the user must divide the
actual thresholds by 0.02, and then convert the result to a 2’s complement number. When the
PA_MODE bit is set to 1, the contents stored in these registers are the altitude thresholds. Its value
should be a 16-bit 2’s complement number and its unit is in meter.
For Example:
PA_MODE = 0 (pressure, unit in 0.02 mbar)
Threshold
800.06 mbar
900 mbar
Hex Value
0x9C43
0xAFC8
PA_H_TH_MSB
0x9C
0xAF
PA_H_TH_LSB
0x43
0xC8
PA_MODE = 1 (altitude, unit in meter)
Threshold
5000 m
Hex Value PA_H_TH_MSB
0x1388
0x13
PA_H_TH_LSB
0x88
These examples are also applied to setting the pressure (or altitude) middle and lower bound
threshold registers as introduced below.
6.2.2 PA_M_TH_LSB, PA_M_TH_MSB - (RW)
The two registers form the 16-bit value of PA_M_TH which saves the pressure (or altitude) middle
threshold for event detection. Similar to the PA_H_TH, the meaning of their values and the data
formats are selected by the PA_MODE bit.
6.2.3 PA_L_TH_LSB, PA_L_TH_MSB - (RW)
The two registers form the 16-bit value of PA_L_TH which saves the pressure (or altitude) lower
bound threshold for event detection. Similar to the PA_H_TH, the meaning of their values and the
data formats are selected by the PA_MODE bit.
6.2.4 T_H_TH - (RW)
This register stores the 8-bit temperature threshold for event detection. The data is in 2’s complement
format and the unit is in ^℃.
For Example:
Threshold
45℃
-20℃
Hex Value
0x2D
0xEC
T_H_TH
0x2D
0xEC
These examples are also applied for setting the temperature middle and lower bound threshold
registers as introduced below.
6.2.5 T_M_TH - (RW)
This register stores the 8-bit temperature middle threshold for event detection. The data is in 2’s
complement format and the unit is in ℃.
6.2.6 T_L_TH - (RW)
This register stores the 8-bit temperature lower bound threshold for event detection. The data is in 2’s
complement format and the unit is in ℃.
6.2.7 Improper Setting of Thresholds
Improperly setting the thresholds, such as setting the lower bound threshold to be larger than the
upper bound threshold, will lead to unexpected behavior of the device. It is recommended for the
user to check the status of the TH_ERR bit in the INT_SRC register after setting the thresholds into
the device. Logic 1 of this bit indicates that improper setting of the thresholds occurs.
HP203B_DataSheet_EN_V2.0
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