AK8448 Datasheet, PDF (39/53 Pages) Asahi Kasei Microsystems – 6-Channel Linear Sensor compatible 10 Bit 40 MSPS x 3 Analog Pre-Processor

ASAHI KASEI
… R2~R7 Registers
„ D7-D0
Offset Data
D7-D0
( Straight Binary )
11111111
11111110
:
10000001
10000000 ( default )
01111111
:
00000001
00000000(Inhibition)
[AK8448]
Offset Voltage
−298.7mV
-296.3mV
:
−2.4mV
0mV
2.4mV
:
298.7mV
(298.7mV)
At Negative Mode
Maximum Shift to
White Level Side
( ADC code large )
↑
|
|
Maximum Shift to
Black Level Side
( ADC code small )
At Positive
Mode
Maximum Shift to
Black level side
( ADC code small )
|
|
↓
Maximum Shift to
White Level Side
( ADC code large )
Offset(x) = ^298.7 × (128 − x) 　mV
127
Default x=128
0≤ x ≤255
… R8~RD Registers
„ D7-D0
PGA Gain Data
Setting code and gain ( ideal value ) relation is expressed in the following equation.
Gain(x) = ^{2 × 208} 　Where x is register set value ( 0 < = x < = 255 )
33.3 + 255 − x
At default x = 0
20
18
16
14
12
10
8
6
4
2
0
0
64
128
192
256
Code
0.1 2
0 .1
0.0 8
0.0 6
0.0 4
0.0 2
0
0
64
12 8
1 92
2 56
Co de
Figure 3 PGA Gain Curves ( ideal values )
MS1513-E-00
39
2013/02