AK8998 Datasheet, PDF (53/59 Pages) Asahi Kasei Microsystems – Preliminary

[AK8998/W/D]
n) VTMP voltage adjustment (EEPROM name: VTMP)
Compensates the offset values for the AK8998's internal temperature sensor and external
temperature sensor. Adjusts the values so that the difference between VTMP voltage and VREF
voltage is close to 0 mV (If VREF is 1005mV, adjust so that VTMP is also 1005mV).
The rough adjustment (ETM[8:6]) is invalid when the internal temperature sensor is used
(ETMP[0]=”H”). The rough adjustment is effective when the external temperature sensor is used
(ETMP[0]=”L”).
∆VTMP in the table below indicates a value varying with the setup values of the EEPROM. The
ratio is benchmarked to 1000mV (VREF ideal value) as 100% (Ratio = ∆VTMP/1000[mV]*100[%]).
Address : 11 hex D[5:0]=ETM[5:0]
ETM[5:0]
Dec Hex
Bin
-32 20 100000
…..
-16 30 110000
…..
-8
38 111000
…..
-4
3C 111100
…..
-1
3F
111111
0
00 000000
1
01 000001
…..
4
04 000100
…..
8
08 001000
…..
16
10
010000
…..
31
1F
011111
Ratio
(%)
+6.4
+3.2
+1.6
+0.8
+0.2
0.0
-0.2
-0.8
-1.6
-3.2
-6.2
∆VTMP
(mV)
+64
+32
+16
+8
+2
0
-2
-8
-16
-32
-62
Comments
Default
Address : 11 hex D[7:6]=ETM[7:6], 13 hex D[1]=ETM[8]
ETM[8:6]
Ratio
∆VTMP
Dec Hex
Bin
(%)
(mV)
4
4
100
Setup prohibited Setup prohibited
5
5
101
Setup prohibited Setup prohibited
6
6
110
+17.0
+170
7
7
111
+8.5
+85
0
0
000
0.0
0
1
1
001
-8.5
-85
2
2
010
-17.0
-170
3
3
011
Setup prohibited Setup prohibited
Comments
Default
MSxxxxx-E-00
- 50 -
2011/12