HMC5983-DEM Datasheet, PDF (16/28 Pages) Honeywell Accelerometers – 3-Axis Digital Compass IC

HMC5983
The table below shows nominal gain settings. Use the “Gain” column to convert counts to Gauss. The “Digital Resolution”
column is the theoretical value in term of milli-Gauss per count (LSb) which is the inverse of the values in the “Gain”
column. The effective resolution of the usable signal also depends on the noise floor of the system, i.e.
Effective Resolution = Max (Digital Resolution, Noise Floor)
Choose a lower gain value (higher GN#) when total field strength causes overflow in one of the data output registers
(saturation). Note that the very first measurement after a gain change maintains the same gain as the previous setting.
The new gain setting is effective from the second measurement and on.
Table 9: Gain Settings
GN2
GN1
GN0
Recommended
Sensor Field
Range
0
0
0
± 0.88 Ga
0
0
1
± 1.3 Ga
0
1
0
± 1.9 Ga
0
1
1
± 2.5 Ga
1
0
0
± 4.0 Ga
1
0
1
± 4.7 Ga
1
1
0
± 5.6 Ga
1
1
1
± 8.1 Ga
Gain
(LSb/
Gauss)
1370
1090 (default)
820
660
440
390
330
230
Digital
Resolution
(mG/LSb)
0.73
0.92
1.22
1.52
2.27
2.56
3.03
4.35
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 )
16
www.honeywell.com