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AK8998 Datasheet, PDF (45/59 Pages) Asahi Kasei Microsystems – Preliminary
[AK8998/W/D]
e) Sensitivity temperature drift adjustment (EEPROM name: ST)
The sensitivity temperature drift for the pressure sensor is adjusted, including the AK8998 internal
error.
After performing the span voltage adjustment at 25ºC, use the EEPROM's sensitivity
temperature drift coefficients for adjustment so that the absolute values of the AK8998's
coefficient are matched to those of the sensor's coefficient.
Address : 05 hex - 06 hex D[8:0]=EST[8:0]
EST[7:0]
Ratio
VDD:3V
VDD:5V
Dec Hex
Bin
0
0 00000000
1
1 00000001
2
2 00000010
(%)
0.00
0.39
0.78
EST
[8]=0
(ppm/°C)
0
18
36
EST
[8]=1
(ppm/°C)
0
-18
-36
EST
[8]=0
(ppm/°C)
0
18
36
EST
[8]=1
(ppm/°C)
0
-18
-36
Comments
Default
::
:
:
:
:
:
:
25 19 00011001 9.80
451
-451
451
-451
26 1A 00011010 10.20
469
-469
469
-469
27 1B 00011011 10.59
487
-487
487
-487
28 1C 00011100 10.98
505
-505
505
-505
::
:
:
137 89 10001001 53.73
138 8A 10001010 54.12
139 8B 10001011 54.51
140 8C 10001100 54.90
:
2471
2489
2507
2525
:
-2471
-2489
-2507
-2525
:
2471
2489
2507
2525
:
-2471
-2489
-2507
-2525
::
:
:
220 DC 11011100 86.27
221 DD 11011101 86.67
222 DE 11011110 87.06
223 DF 11011111 87.45
:
3969
3987
4005
4023
:
-3969
-3987
-4005
-4023
:
3969
3987
4005
4023
:
-3969
-3987
-4005
-4023
::
:
:
:
:
:
:
254 FE 11111110 99.61 4582
-4582
4582
-4582
255 FF 11111111 100.00 4600
-4600
4600
-4600
Note) When ESTC[0] is set to 1hex, adjust in -4000ppm/°C to +2500 ppm/°C. When ESTC[0] is
set to 0hex, adjust in -2500ppm/°C to +1000 ppm/°C.
MSxxxxx-E-00
- 42 -
2011/12