IC-TW2 Datasheet, PDF (20/30 Pages) IC-Haus GmbH – 8-BIT SIN/COS INTERPOLATION IC WITH INTEGRATED EEPROM

iC-TW2 8-BIT SIN/COS INTERPOLATION IC
WITH INTEGRATED EEPROM
FREQ(6:0)
Code
0x00
Addr. 0x05; bit 6:0
Function, defaults to eeprom setting
f core = f _system
...
0x7F
f core
=
f _system
1 + FREQ(6
:
0)
f core
=
f _system
128
Rev D3, Page 20/30
R/W Hysteresis is dependent upon chosen accuracy. The
Table below is valid for high accuracy operation.
HYST(1:0)
Addr. 0x06; bit 1:0
R/W
Code
Function, defaults to eeprom setting
00
no hysteresis
01
±1.4 °
10
±2.81 °
11
±5.63 °
Table 25: Master clock divider
Table 23: Maximum input frequency selection
Interpolation setting (register 0x02) in conjunction with
the frequency divider (register 0x05) defines the iC-
TW2’s accuracy mode. Table 21 explains the corre-
lation. Based on the selected accuracy mode other
system parameters are defined as shown in Table 22.
It is recommended to use the divider at all times when
support for high input frequencies is not required.
CLKDIV
Code
0
1
Addr. 0x0B; bit 1
Function, defaults to eeprom setting
fsystem = fosc
fsystem
=
f _osc
2
R/W
Table 24: Master clock divider
An averaging filter can be enabled to remove loop in-
stability noise. It is recommended to enable the fil-
ter in almost all cases. Enabling the filter increases
SIN/COS input to A/B output latency. See Table 22 on
page 19 for details.
FILTER(1:0)
Addr. 0x06; bit 3:2
R/W
Code
Function, defaults to eeprom setting
00
filter disabled
01
Average of 8 samples
10
Average of 16 samples
11
undefined
Table 26: Datapath filter control
DEVICE IDENTIFICATION
IDA(3:0)
Code
Addr. 0x00; bit 7:4
R/W
Function, Major device identification
Mask Programmed Value Identifies Major Revision
Table 27: Major device revision
IDB(3:0)
Code
Addr. 0x00; bit 3:0
R/W
Function, Minor device identification
Mask Programmed Value Identifies Minor Revision
Table 28: Minor device revision