AK8998 Datasheet, PDF (52/59 Pages) Asahi Kasei Microsystems – Preliminary

[AK8998/W/D]
m) OSC frequency adjustment (EEPROM name: OSC)
EEPROM for adjusting the AK8998 operation clock. Perform an adjustment to attain a frequency
of 1000kHz. Reading the ratio data from the OSC variable ratio register (CT[7:0]), the adjustment
data of the OSC frequency adjustment EERPOM is calculated.
Frequency ∆f in the table below indicates a value varying with the setup values of the EEPROM.
The ratio is benchmarked to 1.000kHz (OSC ideal value) as 100% (Ratio = Frequency ∆f/( Frequency
∆f+1000[kHz])*100[%]).
Address : 10 hex D[3:0]=EFR[3:0]
EFR[3:0]
Ratio Frequency ∆f
Dec Hex
Bin
(%)
(kHz)
-5
B
1011
-34
-251
-4
C
1100
-25
-197
-3
D
1101
-17
-146
-2
E
1110
-11
-99
-1
F
1111
-5
-52
0
0
0000
0
0
1
1
0001
5
49
2
2
0010
10
106
3
3
0011
14
162
4
4
0100
18
224
5
5
0101
22
274
6
6
0110
25
329
7
7
0111
28
384
Note1) Hex 8 to A are prohibited for setup.
Comments
Default
MSxxxxx-E-00
- 49 -
2011/12