AK8998 Datasheet, PDF (44/59 Pages) Asahi Kasei Microsystems – Preliminary

[AK8998/W/D]
c) Offset voltage temperature drift adjustment (EEPROM name: OT)
The offset voltage temperature drift for the pressure sensor is adjusted, including the AK8998 internal
error.
After performing the offset voltage adjustment at 25°C, use the EEPROM's offset voltage temperature
characteristic coefficients for adjustment so that the absolute values of the AK8998's coefficient are
matched to those of the sensor's coefficient.
Address : 03 hex - 04 hex D[8:0]=EOT[8:0]
EOT[7:0]
Ratio
VDD:3V
EOT
EOT
Dec Hex
Bin
(%)
[8]=0
[8]=1
(mV/°C) (mV/°C)
0 00 00000000 0.00
1 01 00000001 0.39
2 02 00000010 0.78
0.000
0.087
0.173
0.000
-0.087
-0.173
3 03 00000011 1.18
0.260 -0.260
4 04 00000100 1.57
：：
：
：
122 7A 01111010 47.84
0.346
：
10.564
-0.346
：
-10.564
123 7B 01111011 48.24 10.650 -10.650
126 7E 01111110 49.41 10.910 -10.910
127 7F 01111111 49.80 10.997 -10.997
128 80 10000000 50.20 11.083 -11.083
129 81 10000001 50.59 11.170 -11.170
130 82 10000010 50.98 11.256 -11.256
131 83 10000011 51.37 11.343 -11.343
132 84 10000100 51.76
133 85 10000101 52.16
：：
：
：
236 EC 11101100 92.55
237 ED 11101101 92.94
238 EE 11101110 93.33
11.430
11.516
：
20.435
20.521
20.608
-11.430
-11.516
：
-20.435
-20.521
-20.608
239 EF 11101111 93.73
：：
：
：
255 FF 11111111 100.00
20.695
：
22.080
-20.695
：
-22.080
VDD:5V
EOT
EOT
[8]=0
[8]=1
(mV/°C) (mV/°C)
0.000
0.144
0.289
0.433
0.577
0.000
-0.144
-0.289
-0.433
-0.577
：
17.606
17.751
18.184
18.328
18.472
18.616
18.761
18.905
19.049
19.194
：
-17.606
-17.751
-18.184
-18.328
-18.472
-18.616
-18.761
-18.905
-19.049
-19.194
：
34.058
34.202
34.347
34.491
：
-34.058
-34.202
-34.347
-34.491
：
：
36.800 -36.800
Comments
Default
d) Sensitivity temperature drift adjustment range change (EEPROM name: ESTC)
The adjustment range of the sensitivity temperature drift coefficient is changed.
By setting the sensitivity temperature drift coefficient adjustment range (ESTC [0]) as "H", the
sensitivity temperature drift coefficient adjustment range will be set from +2500 ppm/°C to
-4000ppm/°C. By setting "L" is used, it will be set from +1000 ppm/°C to -2500 ppm/°C.
Address : 13 hex D[0]= ESTC[0]
D[0] Symbol
Mode setup
D[0] ESTC[0] Sensitivity temperature drift adjustment range change
0
ST25
Sensitivity temperature drift adjustment range :
-2500ppm/°C to +1000ppm/°C (Default)
1
ST40
Sensitivity temperature drift adjustment range :
-4000ppm/°C to +2500ppm/°C
MSxxxxx-E-00
- 41 -
2011/12