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HDC1080
SNAS672A –NOVEMBER 2015–REVISED JANUARY 2016 www.ti.com
8.6 Register Map
The HDC1080 contains data registers that hold configuration information, temperature and humidity
measurement results, and status information.
Table 1. Register Map
Pointer Name Reset value Description
0x00 Temperature 0x0000 Temperature measurement output
0x01 Humidity 0x0000 Relative Humidity measurement output
0x02 Configuration 0x1000 HDC1080 configuration and status
0xFB Serial ID device dependent First 2 bytes of the serial ID of the part
0xFC Serial ID device dependent Mid 2 bytes of the serial ID of the part
0xFD Serial ID device dependent Last byte bit of the serial ID of the part
0xFE Manufacturer ID 0x5449 ID of Texas Instruments
0xFF Device ID 0x1050 ID of the device
Registers addresses 0x03 to 0xFA are reserved and should not be written.
The HDC1080 has an 8-bit pointer used to address a given data register. The pointer identifies which of the data
registers should respond to a read or write command on the two-wire bus. This register is set with every write
command. A write command must be issued to set the proper value in the pointer before executing a read
command. The power-on reset (POR) value of the pointer is 0x00, which selects a temperature measurement.
8.6.1 Temperature Register
The temperature register is a 16-bit result register in binary format (the 2 LSBs D1 and D0 are always 0). The
result of the acquisition is always a 14 bit value. The accuracy of the result is related to the selected conversion
time (refer to Electrical Characteristics
(1)
). The temperature can be calculated from the output data with:
Table 2. Temperature Register Description (0x00)
Name Bits Description
TEMPERATURE [15:02] Temperature Temperature measurement (read only)
[01:00] Reserved Reserved, always 0 (read only)
(1) Electrical Characteristics Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions
result in very limited self-heating of the device such that TJ = TA. No guarantee of parametric performance is indicated in the electrical
tables under conditions of internal self-heating where TJ > TA. Absolute Maximum Ratings indicate junction temperature limits beyond
which the device may be permanently degraded, either mechanically or electrically.
8.6.2 Humidity Register
The humidity register is a 16-bit result register in binary format (the 2 LSBs D1 and D0 are always 0). The result
of the acquisition is always a 14 bit value, while the accuracy is related to the selected conversion time (refer to
Electrical Characteristics
(1)
). The humidity can be calculated from the output data with:
Table 3. Humidity Register Description (0x01)
Name Bits Description
HUMIDITY [15:02] Relative Relative Humidity measurement (read only)
Humidity
[01:00] Reserved Reserved, always 0 (read only)
(1) Electrical Characteristics Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions
result in very limited self-heating of the device such that TJ = TA. No guarantee of parametric performance is indicated in the electrical
tables under conditions of internal self-heating where TJ > TA. Absolute Maximum Ratings indicate junction temperature limits beyond
which the device may be permanently degraded, either mechanically or electrically.
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