IC-MG_14 Datasheet, PDF (15/22 Pages) IC-Haus GmbH – 8-Bit Sin/Cos INTERPOLATION IC WITH RS422 DRIVER

iC-MG
8-Bit Sin/Cos INTERPOLATION IC WITH RS422 DRIVER
Z SIGNAL PATH and CALIBRATION
Rev D1, Page 15/22
The analog voltage signals needed to calibrate the
zero signal are available in Calibration Mode 1. In ad-
dition it is possible to check the phase position of the
PZERO/NZERO enable signal in System Test Mode.
Gain Settings
Parallel to the conditioning process for the S/C signals
the zero signal gain is also set step by step:
1. The tracking of the sensor supply is shut down and
the constant current source for the PWR output set to
a suitable output current (register ADJ; current value
close to the later operating point).
2. Coarse gain is selected so that differential signal
amplitudes of ca. 1 Vpp are generated internally (sig-
nal PCHx vs. NCHx).
3. GFC then permits fine gain adjustment to 1 Vpp.
GRZ
Code
0x0
0x1
0x2
0x3
0x4
0x5
0x6
0x7
Adr 0x11, bit 2:0
Range with RZ=0x9
0.5
1.0
1.3
1.7
2.2
2.6
3.3
4.0
Range with RZ=0x9
2.0
4.1
5.3
6.7
8.7
10.5
13.2
16.0
Table 18: Z-Channel Gain Range
Offset Calibration
To calibrate the offset the source of supply must first
be selected using VOSZ (see S/C Offset Calibration
for further information). For the zero signal path the
signal dependent source is VDCS.
VOSZ
Code
0x0
0x1
0x2
0x3
Adr 0x13, bit 5:4
Type of source
0.05 · V(PWR)
0.5 V
0.25 V
VDC= VDCS
Table 20: Z-Channel Offset Reference Source
ORZ
Code
00
01
10
11
Adr 0x12, bit 1:0
Range
x1
x2
x6
x12
Table 21: Z-Channel Offset Range
OFZ
Code
0x00
0x01
...
0x1F
Adr 0x12, bit 7:2
Factor
0
0.032
...
1
Code
0x20
0x21
...
0x3F
Factor
0
-0.032
...
-1
Table 22: Z-Channel Offset Factor
GFZ
Code
0x00
0x01
...
0x1F
Adr 0x11, bit 7:3
Factor
1.00
1.06
GFZ
6.25 31
6.25
Table 19: Z-Channel Gain Factor