IC-TW2 Datasheet, PDF (12/30 Pages) IC-Haus GmbH – 8-BIT SIN/COS INTERPOLATION IC WITH INTEGRATED EEPROM

iC-TW2 8-BIT SIN/COS INTERPOLATION IC
WITH INTEGRATED EEPROM
OUTPUT MODES
Rev D3, Page 12/30
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
R/W
Code
Function, defaults to eeprom setting
00
AB quadrature mode 0
01
up / dn mode 1
10
inc / dir mode 2
11
3 phase commutation mode 3
Table 9: Output mode selection
In increment / direction mode the count direction can
be inverted via control bit DIR of register 0x01.
DIR
Addr. 0x01; bit 2
R/W
Code
Function, defaults to eeprom setting
0
Normal count direction
1
Inverted count direction
Table 10: Count direction selection
INTER
(7:0)
Code
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
Adr 0x02, Bit 7:0 R/W
STEP
Angle Steps
Per Period
256
IPF
Interpolation
Factor
64
fin()max
Maximum
Permissible Input
Frequency ^*
115 kHz ^**
1
0.25
460 kHz
2
0.5
460 kHz
3
0.75
460 kHz
4
1
460 kHz
5
1.25
460 kHz
...
...
460 kHz
60
15
460 kHz
61
15.25
460 kHz
62
15.5
460 kHz
63
15.75
460 kHz
64
16
460 kHz
65
16.25
230 kHz
66
16.5
230 kHz
67
16.75
230 kHz
68
17
230 kHz
69
17.25
230 kHz
...
...
230 kHz
124
31
230 kHz
125
31.25
230 kHz
126
31.5
230 kHz
127
31.75
230 kHz
128
32
230 kHz
129
32.25
115 kHz
130
32.5
115 kHz
131
32.75
115 kHz
132
33
115 kHz
133
33.25
115 kHz
...
...
115 kHz
250
62.5
115 kHz
251
62.75
115 kHz
252
63
115 kHz
253
63.25
115 kHz
254
63.5
115 kHz
255
63.75
115 kHz
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) .