IC-MSB_17 Datasheet, PDF (26/32 Pages) IC-Haus GmbH – SIN/COS SIGNAL CONDITIONER

iC-MSB^SAFETY, iC-MSB2
SIN/COS SIGNAL CONDITIONER WITH 1Vpp DRIVER
SIGNAL CONDITIONING CH0
Rev F3, Page 26/32
The voltage signals needed to calibrate channel 0 are
available in Calibration Mode 1.
GF0
Code
0x00
0x01
Gain Settings CH0
...
Parallel to the conditioning process for the CH1 and ^0x1F
CH2 signals the CH0 gain is set in the following stages:
Adr 0x11, bit 7:3
Factor
1.00
1.06
GFZ
6.25 31
6.25
Table 39: Fine Gain Factor CH0
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).
Offset Calibration CH0
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
dependent source VDC is identical to source VDC1.
2. The coarse gain is selected so that a differential sig-
nal amplitude of approx. 1 Vpp is produced internally
(signal PCHx versus NCHx).
VOS0
Code
0x0
0x1
0x2
0x3
Adr 0x13, bit 5:4
Source
0.05 · V(ACO)
0.5 V
0.25 V
VDC (ie. VDC1)
3. GF0 then permits fine gain adjustment to 1 Vpp.
Table 40: Offset Reference Source CH0
GR0
Code
0x0
0x1
0x2
0x3
0x4
0x5
0x6
0x7
Notes
Adr 0x11, bit 2:0
Factor
2.0
4.1
5.3
6.7
8.7
10.5
13.2
16.0
The effective total gain calculates as:
G0_eff = GF0 x GR0, respectively
G0_eff = 1/4 x GF0 x GR0
if using the input voltage divider (RIN0 = 0x9).
OR0
Code
0x0
0x1
0x2
0x3
OF0
Code
0x00
0x01
...
0x1F
Adr 0x12, bit 1:0
Range
x1
x2
x6
x12
Table 41: Offset Range CH0
Adr 0x12, bit 7:2
Factor
0
+ 0.0322
+ OF0 /31
+1
Code
0x20
0x21
...
0x3F
Factor
0
− 0.0322
− (OF0 - 32 ) /31
−1
Table 38: Gain Range CH0
Table 42: Offset Factor CH0