iC-TW2
8-BIT SIN/COS INTERPOLATION IC
WITH INTEGRATED EEPROM
Rev D3, Page 12/30
OUTPUT MODES
The iC-TW2 provides four different output modes,
which are configured by programming bits MODE(1:0)
of register 0x01. Modes 0, 1 and 2 are incremental
modes whereas mode 3 is a 3-phase commutation out-
put for brushless DC motors. Consider Figure 4 for a
comparison of the 3 incremental output modes.
MODE(1:0)
Addr. 0x01; bit 1:0
Code
Function,
defaults to eeprom setting
00
01
10
11
AB quadrature mode 0
up / dn mode 1
inc / dir mode 2
3 phase commutation mode 3
R/W
INTER
(7:0)
Code
Adr 0x02, Bit 7:0 R/W
STEP
Angle Steps
Per Period
256
1
2
3
4
5
...
60
61
62
63
64
65
66
67
68
69
...
124
125
126
127
128
129
130
131
132
133
...
250
251
252
253
254
255
IPF
Interpolation
Factor
64
0.25
0.5
0.75
1
1.25
...
15
15.25
15.5
15.75
16
16.25
16.5
16.75
17
17.25
...
31
31.25
31.5
31.75
32
32.25
32.5
32.75
33
33.25
...
62.5
62.75
63
63.25
63.5
63.75
fin()max
Maximum
Permissible Input
Frequency
*
115 kHz
**
460 kHz
460 kHz
460 kHz
460 kHz
460 kHz
460 kHz
460 kHz
460 kHz
460 kHz
460 kHz
460 kHz
230 kHz
230 kHz
230 kHz
230 kHz
230 kHz
230 kHz
230 kHz
230 kHz
230 kHz
230 kHz
230 kHz
115 kHz
115 kHz
115 kHz
115 kHz
115 kHz
115 kHz
115 kHz
115 kHz
115 kHz
115 kHz
115 kHz
115 kHz
0x00
0x01
0x02
0x03
0x04
0x05
...
0x3C
0x3D
0x3E
0x3F
0x40
0x41
0x42
0x43
0x44
0x45
...
0x7C
0x7D
0x7E
0x7F
0x80
0x81
0x82
0x83
0x84
0x85
...
0xFA
0xFB
0xFC
0xFD
0xFE
0xFF
Table 9: Output mode selection
In increment / direction mode the count direction can
be inverted via control bit DIR of register 0x01.
DIR
Code
0
1
Addr. 0x01; bit 2
Function,
defaults to eeprom setting
Normal count direction
Inverted count direction
R/W
Table 10: Count direction selection
Table 11: Converter resolution
*
Depending on configuration FREQ = 0, CLKDIV = 0
and f
cal
= 920 kHz.
**
Maximum permissible input frequency for commuta-
tion operation (mode = 3) .
ICHAUS [ IC-HAUS GMBH ]
