AK8996 Datasheet, PDF (54/74 Pages) Asahi Kasei Microsystems – Pressure Sensor Interface IC

[AK8996/W]
5) Register Description
5.1) Description of EEPROM Register
5.1.1) Adjustment Section Register
Offset and span adjustment should be made after mode setup and adjustment of the reference
generator section including VREF, IREF, OSC and VTMP.
***** CAUTION *****
At the time of adjustment, set the EEPROM control mode to EEPROM Always Operating mode
(Control register Address 01 hex AEPEN[0]:1).
a) Offset voltage adjustment (Register names: OCR, OCF)
Rough adjustment should be performed first, followed by a fine adjustment for the offset voltage.
The content of the adjustment registers are shown here.
a-1) Offset voltage rough adjustment (OCR)
The offset voltage is coarsely tuned.
The offset adjustment voltage varies ratiometrically with respect to the supply voltage.
The ratio in the table below is benchmarked to a VOUT output of 4000 mV (@VDD: 5V) as 100%
(ratio = (Offset voltage @VDD: 5V)/4000[mV]*100[%]).
Address: 00 hex D[3:0]=ECO[10:7]
EOC[9: 7]
Ratio
VDD: 3V
EOC
EOC
Dec Hex Bin
(%) [10]=0 [10]=1
(mV)
(mV)
0
0
000 0.00
0
0
1
1
001 7.50
150
-150
2
2
010 15.00 300
-300
3
3
011 22.50 450
4
4
100 30.00 600
5
5
101 37.50 750
-450
-600
-750
6
6
110 45.00 900
-900
7
7
111 52.50 1050
-1050
VDD: 5V
EOC
EOC
[10]=0 [10]=1
(mV)
(mV)
0
0
300
-300
600
-600
900
-900
1200 -1200
1500 -1500
1800 -1800
2100 -2100
Comments
Default
MS1055-E-02
54
2011/12