iC-TW2 8-BIT SIN/COS INTERPOLATION IC
WITH INTEGRATED EEPROM
Rev D3, Page 14/30
IWIDTH(3:0)
Addr. 0x04; bit 3:0
R/W
3 Phase Commutation Mode
Code
0111
. . .
V output offset, defaults to eeprom setting
The 3 phase commutation output (mode 3) is shown
in Figure 5. 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.
9.84°
. . .
0010
0001
0000
1111
1110
. . .
2.81°
1.40°
0°
-1.40°
-2.81°
. . .
1111
11.25°
Table 15: V commutation signal position offset
IWIDTH(7:4)
Addr. 0x04; bit 7:4
R/W
0°
IPOS
(7:0)
120° 240°
0°
Code
0111
. . .
W output offset, defaults to eeprom setting
9.84°
. . .
0010
0001
0000
1111
1110
. . .
2.81°
1.40°
0°
A_U
B_V
Z_W
IWIDTH
(3:0)
-1.40°
-2.81°
. . .
IWIDTH
(7:4)
1111
11.25°
Figure 5: 3-Phase commutation output (mode 3)
Table 16: W commutation signal position offset
IPOS(7:0)
Addr. 0x03; bit 7:0
R/W
Code
Function, defaults to eeprom setting
0
0°
1
1.40°
2.81°
. . .
2
. . .
Programmed value is within the range of 0 to
INTER(7:0) - 1.
. . .
. . .
255
358,59°
Table 14: UVW commutation signal position offset
ICHAUS [ IC-HAUS GMBH ]
