IC-TW2_13 Datasheet, PDF (14/28 Pages) IC-Haus GmbH – 8-BIT SIN/COS INTERPOLATION IC

iC-TW2 8-BIT SIN/COS INTERPOLATION IC
WITH INTEGRATED EEPROM
3 Phase Commutation Mode
The 3 phase commutation output (mode 3) is shown
in Figure 6. It is important that register INTER(7:0)
is programmed with the value 0x00 in order for the
commutation mode to work. The mode = 3 requires
an internal interpolation INTER(7:0) of 256. Register
IPOS(7:0) is used to accurately position the commu-
tation. IWIDTH(7:4) and IWIDTH(3:0) is subsequently
used to fine tune V and W in respect to U. All used
offsets within the commutation mode (mode 3) as are
IPOS(7:0), IWIDTH(3:0) and IWIDTH(7:4) operate in
this step width of 1.4° . There is no other pole count
commutation possible to configure as the described 3
phase commutation.
0° 120° 240° 0°
A_U
IPOS
(7:0)
B_V
Z_W
IWIDTH
(3:0) _IWIDTH
(7:4)
Figure 6: 3-Phase commutation output (mode 3)
IPOS(7:0)
Code
0
1
2
...
...
255
Addr. 0x03; bit 7:0
R/W
Function, defaults to eeprom setting
0°
1.40°
2.81°
...
Programmed value is within the range of 0 to
INTER(7:0) - 1.
...
358,59°
Table 14: UVW commutation signal position offset
Rev E2, Page 14/28
IWIDTH(3:0)
Addr. 0x04; bit 3:0
R/W
Code
V output offset, defaults to eeprom setting
0111
9.84°
...
...
0010
2.81°
0001
1.40°
0000
0°
1111
-1.40°
1110
-2.81°
...
...
1111
11.25°
Table 15: V commutation signal position offset
IWIDTH(7:4)
Addr. 0x04; bit 7:4
R/W
Code
W output offset, defaults to eeprom setting
0111
9.84°
...
...
0010
2.81°
0001
1.40°
0000
0°
1111
-1.40°
1110
-2.81°
...
...
1111
11.25°
Table 16: W commutation signal position offset