HMC5983-DEM Datasheet, PDF (21/28 Pages) Honeywell Accelerometers – 3-Axis Digital Compass IC

HMC5983
Identification Register B
The identification register B is used to identify the device. IRB0 through IRB7 indicate bit locations, with IRB denoting the
bits that are in the identification register A. IRB7 denotes the first bit of the data stream.
Register values. ASCII value 4
Table 19: Identification Register B Default Values
IRB7
0
IRB6
0
IRB5
1
IRB4
1
IRB3
0
IRB2
1
IRB1
0
IRB0
0
Identification Register C
The identification register C is used to identify the device. IRC0 through IRC7 indicate bit locations, with IRC denoting the
bits that are in the identification register A. IRC7 denotes the first bit of the data stream.
Register values. ASCII value 3
Table 20: Identification Register C Default Values
IRC7 IRC6
0
0
IRC5
1
IRC4
1
IRC3
0
IRC2
0
IRC1
1
IRC0
1
Temperature Output Registers H and L
The temperature output registers are two 8-bit registers, temperature output register H and temperature output register L.
These registers store the measurement result from the internal temperature sensor. Temperature output register H
contains the MSB from the measurement result, and temperature output register L contains the LSB from the
measurement result. The value stored in these two registers is a 16-bit value in 2’s complement form, whose range is
0xF800 to 0x07FF. TEMPH0 through TEMPH7 and TEMPL0 through TEMPL7 indicate bit locations, with TEMPH and
TEMPL denoting the bits that are in the temperature output registers. TEMPH7 and TEMPL7 denote the first bit of the
data stream. The number in parenthesis indicates the default value of that bit.
Table 21: Temperature Output Registers H and L
TEMPH7 TEMPH 6 TEMPH 5 TEMPH 4 TEMPH 3 TEMPH 2 TEMPH 1 TEMPH 0
(0)
(0)
(0)
(0)
(0)
(0)
(0)
(0)
TEMPL 7 TEMPL 6 TEMPL 5 TEMPL 4 TEMPL 3 TEMPL 2 TEMPL 1 TEMPL 0
(0)
(0)
(0)
(0)
(0)
(0)
(0)
(0)
Temperature output in C is related to the temperature output register values as follows.
Temperature = (MSB * 2^8 + LSB) / (2^4 * 8) + 25 in C
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