iC-Haus iC-TW29 - SPI Port; Reserved Pins

preliminary preliminary
iC-TW29 26-BIT ENCODER PROCESSOR
WITH INTERPOLATION AND BiSS INTERFACE
Rev C1, Page 25/28
SPI Port
The iC-TW29 provides a standard SPI (Serial Periph-
eral Interface) slave port that can be used for device
conguration and communication with a host proces-
sor. Connect the SPI port pins to the host processor as
shown in Figure 24.
SO
SI
SCLK
xSS xCS
SCLK
MO
MI
iC-TW29
Host µP
or µC
3.3V
Figure 24: SPI Port Connection
If the host processor or microcontroller can be discon-
nected, the SPI port pins must be pulled up or down as
shown in Figure 24. Do not allow any of the SPI port
pins to oat.
Although Figure 24 shows a single-device application,
multiple iC-TW29’s can also communicate over a single
SPI channel to a host processor.
Reserved Pins
All reserved pins must be tied to ground as shown in
Figures 15, 16, and 17 for proper operation.