AK8975 Datasheet, PDF (28/34 Pages) Asahi Kasei Microsystems – 3-axis Electronic Compass

[AK8975/C]
8.3.11.
ASAX, ASAY, ASAZ: Sensitivity Adjustment values
Register
Addr
D7
D6
D5
D4
D3
D2
D1
D0
name
Read-only register
10H
ASAX
11H
ASAY
12H
ASAZ
Reset
COEFX7 COEFX6 COEFX5 COEFX4 COEFX3 COEFX2 COEFX1 COEFX0
COEFY7 COEFY6 COEFY5 COEFY4 COEFY3 COEFY2 COEFY1 COEFY0
COEFZ7 COEFZ6 COEFZ5 COEFZ4 COEFZ3 COEFZ2 COEFZ1 COEFZ0
-
-
-
-
-
-
-
-
Sensitivity adjustment data for each axis is stored to fuse ROM on shipment.
ASAX[7:0]:
ASAY[7:0]:
ASAZ[7:0]:


Magnetic sensor X-axis sensitivity adjustment value
Magnetic sensor Y-axis sensitivity adjustment value
Magnetic sensor Z-axis sensitivity adjustment value
<How to adjust sensitivity>
The sensitivity adjustment is done by the equation below;
Hadj = H × _⎜⎛ ^{(ASA −128)× 0.5} + 1_⎟⎞ ,
⎝
128
⎠
where H is the measurement data read out from the measurement data register, ASA is the sensitivity
adjustment value, and Hadj is the adjusted measurement data.
MS1187-E-02
- 28 -
2010/05