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18 CY3270 PSoC® FirstTouch™ Guide, Document # 001-15945 Rev. **
Technical Reference
Noticed that the CY8C24894 PSoC device is the only active component in the entire circuit. This sin-
gle PSoC handles all communications between the applications, USB, and expansion card inter-
faces.
The FirstTouch expansion card connects to the FTPC bridge through the 8x2 Expansion Port (this is
a built-in port on the bridge). If you are using only the FirstTouch expansion card, it is generally not
necessary to understand everything about this expansion port or the signals that it contains. By
attaching an expansion card, all of the necessary connections are made.
Figure 3-2 is the pinout diagram for the FTPC Expansion Port. Refer to this figure as you create
projects. As you get more accustomed to the FirstTouch Kit and design flow, you may find yourself
wanting to make your own expansion cards. At that time, you may want to review the interface sig-
nals.
Figure 3-2. FTPC Expansion Port Pinout Diagram
8x2 0.100" FEMALE Expansion Receptacle
GPIO5
GPIO4
GPIO3
GPIO2
SCL_SCLK
SDA_MOSI
DETECT
ISSP_XRES
ISSP_CLK
ISSP_DAT
SPI_MISO
SPI_nSS
TYPE
V50
0805
R3
100K
J3
8X2 PIN RECPT RA
1
3
5
7
9
11
4
13
15
6
8
2
16
14
12
10
VEXP_IN
GND
ISSP_XRES
ISSP_CLK
ISSP_DAT
EXP_TYPE
VEXP_OUT
MISO
SPI_nss
SDA-MOSI
SCL-SCLK
VLOCAL
GPIO2
GPIO3
GPIO4
GPIO5
0805
R2
100K
+
A
C1
22 uFd 10v