iC-MQ
PROGRAMMABLE 9-BIT
Sin/Cos INTERPOLATION IC WITH RS422 DRIVER
Rev D4, Page 26/39
SINE-TO-DIGITAL CONVERSION
SELRES
Value
Adr 0x1C, bit 6:0; Adr 0x1B, bit 7:0
STEP
IPF
fin()max
Angle Steps
Interpolation
Permissible Input
Per Period
Factor
Frequency
(MTD=0x8)
4
8
12
16
20
24
32
40
48
64
80
96
100
128
192
200
384
400
1
2
3
4
5
6
8
10
12
16
20
24
25
32
48
50
96
100
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
0x00E0
0x01B0
0x02A0
0x0398
0x0414
0x0590
0x078C
0x090A
0x0B88
0x0F86
0x1305
0x1784
0x1804
0x1F83
0x2F82
0x3102
0x5F81
0x6301
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.
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.
SELHYS
Code
0x0
0x1
0x2
0x3-0xD
0xE
0xF*
Notes
Adr 0x1D, bit 3:0
Function
Nearly no hysteresis
1 increment (≈ 0.9°)
2 increments (≈ 1.8°)
3-13 increments (≈ 2.7°-11.7°)
SELRES(6:1) increments (0.5 LSB)
SELRES(6:0) increments
*) Not permissible with SELRES = 0x00E0
Table 44: Converter Hysteresis
Table 43: Converter Resolution
ICHAUS [ IC-HAUS GMBH ]
