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