DataSheet

HP203B

HP203B_DataSheet_EN_V2.0

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temperature value. The user shall convert this 20-bit 2’s complement binary value into an integer, and

then 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 value

is stored in all 24 bits of OUT_T_MSB, OUT_T_CSB and OUT_T_LSB. The 4 most significant bits of

the 24-bit data is useless, while the 20 least significant bits represent the altitude value. The user

shall convert this 20-bit unsigned binary value into an integer, and then divide the integer by 100 to

obtain the final result.

)

Hex value

OUT_A_MSB

OUT_A_CSB

OUT_A_LSB

Dec value

0x001388

0x00

0x13

0x88

50.00

0xFFEC78

0xFF

0xEC

0x78

-50.00

4. 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. Pressure

value is stored in all 24 bits of OUT_T_MSB, OUT_T_CSB and OUT_T_LSB. The 4 most

significant bits of the 24-bit data is useless, while the 20 least significant bits represent the

pressure value. The user shall convert this 20-bit unsigned binary value into an integer, and then

divide 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. Altitude

value is stored in all 24 bits of OUT_T_MSB, OUT_T_CSB and OUT_T_LSB. The 4 most

significant bits of the 24-bit data is useless, while the 20 least significant bits represent the altitude

value. The user shall convert this 20-bit unsigned binary value into an integer, and then divide the

integer 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 degrees

C.Temperature value is stored in all 24 bits of OUT_T_MSB, OUT_T_CSB and OUT_T_LSB. The 4

most significant bits of the 24-bit data is useless, while the 20 least significant bits represent the

temperature value. The user shall convert this 20-bit 2’s complement binary value into an integer, and

then 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 to

soft resetting the device. It is designed for the applications where the device needs to work in a

rapidly changed environment. In those environments, since the temperature and supply voltage

may have changed significantly since the first power-up sequence during which the calibrations

have been performed, the circuitries may not adept to the world as better as they were just

calibrated. Therefore, in this case, re-calibrating the circuitries before performing any sensor

conversions can give a more accurate result. Once the device received this command, it

calibrates all the circuitries and enters the sleep state when it finishes. The user can simply send

this command to the device before sending the ADC_CVT command. However, it is not necessary

to use this command when the environment is stable.