IC-MQ_15 Datasheet, PDF (24/43 Pages) IC-Haus GmbH – Sin/Cos INTERPOLATION IC WITH RS422 DRIVER

iC-MQ PROGRAMMABLE 9-BIT
Sin/Cos INTERPOLATION IC WITH RS422 DRIVER
SIGNAL CONDITIONING CH0
Rev F3, Page 24/43
The voltage signals needed to calibrate the zero chan-
nel are available in mode Calibration 1. The relative
phase position of the ungated zero signal Zin compared
to A and B can be determined in mode System Test.
Gain Settings CH0
Parallel to the conditioning process for the CH1 and
CH2 signals the CH0 gain is also set in the following
steps:
1. The sensor supply controller is shut down and the
constant current source for the ACO output set to the
same output current as in the calibration of CH1 and
CH2 (register ADJ; current value close to the later op-
erating point).
2. The coarse gain is selected so that a differential sig-
nal amplitude of ca. 1 Vpp is produced internally (signal
PCHi versus NCHi).
3. GF0 then permits fine gain adjustment to 1 Vpp. The
total gain is accrued from GR0 x GF0.
GR0
Code
0x0
0x1
0x2
0x3
0x4
0x5
0x6
0x7
Addr 0x11, bit 2:0
Range RIN0 = 0x9
0.5
1.0
1.3
1.7
2.2
2.6
3.3
4.0
Range RIN0 ̸= 0x9
2.0
4.1
5.3
6.7
8.7
10.5
13.2
16.0
Offset Calibration CH0
To calibrate the offset the reference source 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.
VOS0
Code
0x0
0x1
0x2
0x3
Addr 0x13, bit 5:4
Source
0.05 · V(ACO)
0.5 V
0.25 V
VDC (i.e. VDC1)
Table 33: Offset Reference Source CH0
OR0
Code
0x0
0x1
0x2
0x3
Addr 0x12, bit 1:0
Range
x1
x2
x6
x12
Table 34: Offset Range CH0
OF0
Code
0x00
0x01
...
0x1F
Addr 0x12, bit 7:2
Factor
0
+ 0.0322
+ OF0 /31
+1
Code
0x20
0x21
...
0x3F
Factor
0
− 0.0322
− (OF0 - 32 ) /31
−1
Table 35: Offset Factor CH0
Table 31: Gain Range CH0
GF0
Code
0x00
0x01
...
0x1F
Addr 0x11, bit 7:3
Factor
1.00
1.06
GF0
6.25 31
6.25
Table 32: Fine Gain Factor CH0