iC-MQ PROGRAMMABLE 9-BIT
Sin/Cos INTERPOLATION IC WITH RS422 DRIVER
Rev D4, Page 26/39
SINE-TO-DIGITAL CONVERSION
SELRES
Adr 0x1C, bit 6:0; Adr 0x1B, bit 7:0
iC-MQ’s converter resolution can be set using SEL-
RES. For a resolution of 4, four angle steps per in-
put signal period are generated so that the switching
frequency at the A and B output matches the sine fre-
quency at the input.
Value
STEP
IPF
fin()max
Angle Steps
Per Period
Interpolation
Factor
Permissible Input
Frequency
(MTD=0x8)
0x00E0
0x01B0
0x02A0
0x0398
0x0414
0x0590
0x078C
0x090A
0x0B88
0x0F86
0x1305
0x1784
0x1804
0x1F83
0x2F82
0x3102
0x5F81
0x6301
4
1
500 kHz
500 kHz
200 kHz
200 kHz
200 kHz
166 kHz
125 kHz
100 kHz
83 kHz
62.5 kHz
50 kHz
40 kHz
40 kHz
30 kHz
20 kHz
20 kHz
10 kHz
10 kHz
8
2
The programmable converter hysteresis is determined
by SELHYS. It is set in multiples of the increment size
and may have a maximum of 45° of the input signal
period.
12
3
16
4
20
5
24
6
32
8
SELHYS
Code
0x0
Adr 0x1D, bit 3:0
40
10
12
16
20
24
25
32
48
50
96
100
Function
48
Nearly no hysteresis
64
0x1
1 increment (≈ 0.9°)
80
0x2
2 increments (≈ 1.8°)
96
0x3-0xD
0xE
3-13 increments (≈ 2.7°-11.7°)
SELRES(6:1) increments (0.5 LSB)
SELRES(6:0) increments
*) Not permissible with SELRES = 0x00E0
100
128
192
200
384
400
0xF*
Notes
Table 44: Converter Hysteresis
Table 43: Converter Resolution
ICHAUS [ IC-HAUS GMBH ]
