Technical Reference
3.2Expansion Card Overview
The FirstTouch expansion card is designed to plug and play with the FTPC bridge. All power for the included expansion cards is provided by the FTPC bridge directly from the USB bus. No other power supply is necessary when an expansion card is connected to the FTPC bridge. Connection to the FTPC Expansion Port is through the 8x2 or 5x2 pin header on the expansion card.
The FirstTouch expansion cards have a dedicated host PSoC device installed. The particular PSoC installed was chosen to act as an example as to which PSoC is most suitable for the types of appli- cations that the particular expansion card supports. This also makes it easier to transfer your design from the FirstTouch kit to your hardware.
By having a dedicated host PSoC, you can program then remove the expansion card from the FTPC bridge. Once removed, it operates in a standalone mode or connects to your system level hardware. This creates a design that provides ‘PSoC Powered Peripherals’ and quickly integrate them into your system. Before doing so, it is important to review the schematic for the particular expansion card, to determine the proper power and ground connections and voltage levels.
The expansion card contain a variety of peripheral components that allow you to experiment with many different sensors and signal types. Each of the sensors use dedicated host PSoC IO pins. Therefore, it is important to note which pins connect the various sensors to the host PSoC. These details are provided in the expansion card specific portion of this guide.
3.3Expansion Card Details
This section provides details for the expansion cards included with the FirstTouch Kit. Future expan- sion cards will include additional documentation and demonstration projects that are specific to their operation and configuration.
3.3.1FirstTouch MultiFunction Expansion (FTMF) Card
The FTMF Expansion Card contains a CY8C21434 PSoC that acts as the ‘host’ for various demon- strations. The FTMF Expansion Card has hardware to support the following PSoC powered periph- eral applications:
■CapSense ‘Touch Button’
■CapSense
■CapSense
■Ambient
■
In addition to the above input sensors, the FTMF card also provides the following output devices:
■
■Audible magnet transducer or speaker, or both
■I2C digital communications
■Four unused A/D GPIO lines for user functions
CY3270 PSoC® FirstTouch™ Guide, Document # | 19 |