iC-MSBSAFETY, iC-MSB2
SIN/COS SIGNAL CONDITIONER WITH 1Vpp DRIVER
Rev D2, Page 23/29
SIGNAL CONDITIONING CH0
The voltage signals needed to calibrate channel 0 are Offset Calibration CH0
available in Calibration Mode 1.
To calibrate the offset the source of supply must first
be selected using VOS0 (see Offset Calibration CH1
and CH2 for further information). For the CH0 path the
Gain Settings CH0
Parallel to the conditioning process for the CH1 and dependent source VDC is identical to source VDC1.
CH2 signals the CH0 gain is set in the following stages:
VOSZ
Code
0x0
Adr 0x13, bit 5:4
1. The sensor supply tracking unit is shut down and the
constant current source for the ACO output set to the
same output current as in the compensation of CH1
and CH2 (register ADJ; current value close to the later
operating point).
Source
0.05 · V(ACO)
0.5 V
0x1
0x2
0.25 V
0x3
VDC (ie. VDC1)
Table 40: Offset Reference Source CH0
2. The coarse gain is selected so that a differential sig-
nal amplitude of ca. 1 Vpp is produced internally (sig-
nal PCHx versus NCHx).
OR0
Code
0x0
Adr 0x12, bit 1:0
Range
x1
3. GF0 then permits fine gain adjustment to 1 Vpp.
0x1
x2
GR0
Code
0x0
0x1
0x2
0x3
0x4
0x5
0x6
0x7
Adr 0x11, bit 2:0
0x2
x6
Range with RIN0=0x9
Range with RIN0=0x9
0x3
x12
0.5
1.0
1.3
1.7
2.2
2.6
3.3
4.0
2.0
4.1
Table 41: Offser Range CH0
5.3
6.7
OF0
Code
0x00
0x01
...
Adr 0x12, bit 7:2
8.7
Factor
Code
0x20
0x21
...
Factor
10.5
13.2
16.0
0
0
0.0322
-0.0322
-0.0322 · OFZ
-1
0.0322 · OFZ
1
0x1F
0x3F
Table 38: Gain Range CH0
Table 42: Offset Factor CH0
GF0
Code
0x00
0x01
...
Adr 0x11, bit 7:3
Factor
1.00
1.06
6.25GFZ
31
0x1F
6.25
Table 39: Fine Gain Factor CH0
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