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## HP203B Datasheet(PDF) 7 Page - List of Unclassifed Manufacturers

 Part No. HP203B Description PRECISION BAROMETER AND ALTIMETER SENSOR Download 18 Pages Scroll/Zoom 100% Maker ETC2 [List of Unclassifed Manufacturers] Homepage Logo

## HP203B Datasheet(HTML) 7 Page - List of Unclassifed Manufacturers

 7 / 18 page DataSheetHP203BHP203B_DataSheet_EN_V2.0www.hoperf.com7 / 18temperature value. The user shall convert this 20-bit 2’s complement binary value into an integer, andthen divide the integer by 100 to obtain the final result.The altitude data is arranged as 20-bit 2’s complement format and the unit is in meters. Altitude valueis stored in all 24 bits of OUT_T_MSB, OUT_T_CSB and OUT_T_LSB. The 4 most significant bits ofthe 24-bit data is useless, while the 20 least significant bits represent the altitude value. The usershall convert this 20-bit unsigned binary value into an integer, and then divide the integer by 100 toobtain the final result.For Example :(Altitude)Hex valueOUT_A_MSBOUT_A_CSBOUT_A_LSBDec value0x0013880x000x130x8850.000xFFEC780xFF0xEC0x78-50.004. 2.5 Read the Pressure Value.READ_P (0x30)The pressure data is arranged as 20-bit 2’s complement format and the unit is in Pascal. Pressurevalue is stored in all 24 bits of OUT_T_MSB, OUT_T_CSB and OUT_T_LSB. The 4 mostsignificant bits of the 24-bit data is useless, while the 20 least significant bits represent thepressure value. The user shall convert this 20-bit unsigned binary value into an integer, and thendivide the integer by 100 to obtain the final result.4. 2.6 Read the Altitude Value.READ_A (0x31)The altitude data is arranged as 20-bit 2’s complement format and the unit is in meters. Altitudevalue is stored in all 24 bits of OUT_T_MSB, OUT_T_CSB and OUT_T_LSB. The 4 mostsignificant bits of the 24-bit data is useless, while the 20 least significant bits represent the altitudevalue. The user shall convert this 20-bit unsigned binary value into an integer, and then divide theinteger by 100 to obtain the final result.4. 2.7 Read the Temperature Value.READ_T (0x32)The temperature data is arranged as 20-bit 2’s complement format and the unit is in degreesC.Temperature value is stored in all 24 bits of OUT_T_MSB, OUT_T_CSB and OUT_T_LSB. The 4most significant bits of the 24-bit data is useless, while the 20 least significant bits represent thetemperature value. The user shall convert this 20-bit 2’s complement binary value into an integer, andthen divide the integer by 100 to obtain the final result.4. 2.8 Re-calibrate the Internal analog Blocks.ANA_CAL (0x28)This command allows the user to re-calibrate the internal circuitries in a shorter time compare tosoft resetting the device. It is designed for the applications where the device needs to work in arapidly changed environment. In those environments, since the temperature and supply voltagemay have changed significantly since the first power-up sequence during which the calibrationshave been performed, the circuitries may not adept to the world as better as they were justcalibrated. Therefore, in this case, re-calibrating the circuitries before performing any sensorconversions can give a more accurate result. Once the device received this command, itcalibrates all the circuitries and enters the sleep state when it finishes. The user can simply sendthis command to the device before sending the ADC_CVT command. However, it is not necessaryto use this command when the environment is stable.