WWW.ICS-CTRL.COM
USER MANUAL FOR HARDWARE REV 3.11
07-APR-2018
PAGE 10
3.8
SPI EXPANSION
A SPI expansion header has been included for the user to be
able to install any SPI device desired. It should be noted that
this header only supports 5V logic devices. If you install 3.3V
logic devices, they may become damaged.
It is the user’s responsibility to provide logic level translation if
a 3V3 device is used in the port.
The Chip Select CS1 has been routed to this port, which is
supported natively with Device Tree Overlays for convenience,
additional SPI devices can be used on this port as well, but the user is responsible for providing the Chip
Select connectivity.
It is recommended to utilize MCP23S17 gpio expander device if a Chip Select source is needed for
multiple SPI devices are desired. The MCP23S17 device is recommended due to wide usage and
support provided by current Raspberry Pi distributions.
3.9
I2S EXPANSION
A 10 pin header has been included to allow for specialized I2S
sound card devices to be used. This is provided for user design.
INSTALLED I2S SOUND CHIPS IN LOCATIONS U7 OR U9
MUST BE REMOVED PRIOR TO INSTALLING ANYTHING ON
THIS HEADER.
3.10
1-WIRE HEADER
A 3 pin header has been included to allow for specialized 1-wire devices to be
used. This is provided for user design and devices on this port are not supported
by ICS-CTRL.
This port connects directly to the processor and misconnected devices may cause
damage to the system. Please use appropriate precautions to prevent damage to you Raspberry Pi.
