HMC5843 Datasheet, PDF (12/19 Pages) Honeywell Solid State Electronics Center – 3-Axis Digital Compass IC

HMC5843
Configuration Register B
The configuration register B for setting the device gain. CRB0 through CRB7 indicate bit locations, with CRB denoting the
bits that are in the configuration register. CRB7 denotes the first bit of the data stream. The number in parenthesis
indicates the default value of that bit.
CRB7
GN2 (0)
CRB6
GN1 (0)
CRB5
CRB4
CRB3
CRB2
GN0 (1) (0)
(0)
(0)
Table 10: Configuration B Register
CRB1
(0)
CRB0
(0)
Location
CRB7 to CRB5
Name
GN2 to GN0
Description
Gain Configuration Bits. These bits configure the gain for
the device. The gain configuration is common for all
channels.
CRB4 to CRB0 0
This bit must be cleared for correct operation.
Table 11: Configuration Register B Bit Designations
The table below shows nominal gain settings.
GN2
GN1
GN0
Sensor Input Field
Range:
Gain
(counts/
milli-gauss)
0
0
0
±0.7Ga
1620
0
0
1
±1.0Ga (default)
1300
0
1
0
±1.5Ga
970
0
1
1
±2.0Ga
780
1
0
0
±3.2Ga
530
1
0
1
±3.8Ga
460
1
1
0
±4.5Ga
390
1
1
1
±6.5Ga
(Not Recommended)
280
Table 12: Gain Settings
Output Range
0xF800 –0x07FF
(-2048–2047 )
0xF800 –0x07FF
(-2048–2047 )
0xF800 –0x07FF
(-2048–2047 )
0xF800 –0x07FF
(-2048–2047 )
0xF800 –0x07FF
(-2048–2047 )
0xF800 –0x07FF
(-2048–2047 )
0xF800 –0x07FF
(-2048–2047 )
0xF800 –0x07FF
(-2048–2047 )
12
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