CP2105-EK
Rev. 0.5
5
6.2. Universal Serial Bus (USB) Interface (P1)
A Universal Serial Bus (USB) connector (P1) is provided to facilitate connections to the USB interface on the
CP2105. See Table 2 for the USB pin definitions.
6.3. UART Signals (P2, P3, J1, J6)
Two RS232 transceiver circuits and DB-9 connectors (P2, P3) are provided on the evaluation board to connect the
CP2105 virtual serial ports to external serial devices. See Table 3 for the RS232 P2 and P3 pin descriptions. The
J2 and J6 connectors are provided to facilitate direct access to the CP2105’s UART signals. Shorting blocks on J1
are required to connect the Standard UART signals to P2, and the shorting blocks on J6 are required to connect
the Enhanced UART signals to P3. See Table 4 for J1 and J6 pin descriptions.
Table 2. USB Connector Pin Descriptions
Pin #
Description
1
VBUS
2
D-
3
D+
4
GND (Ground)
Table 3. RS232 Pin Descriptions
Pin
Signal
CP2105
Direction
Description
1
DCD
Input
Data Carrier Detect
2
RXD
Input
Receive Data
3
TXD
Output
Transmit Data
4
DTR
Output
Data Terminal Ready
5
GND
Ground
6
DSR
Input
Data Set Ready
7
RTS
Output
Request to Send
8
CTS
Input
Clear to Send
9
RI
Input
Ring Indicator
Table 4. J1, J6 Pin Descriptions
Pins
Signal
CP2105
Direction
Description
1-2
TXD
Output
Transmit Data
3-4
RXD
Input
Receive Data
5-6
DTR
Output
Data Terminal Ready
7-8
RI
Input
Ring Indicator
9-10
DCD
Input
Data Carrier Detect
11-12
DSR
Input
Data Set Ready
13-14
CTS
Input
Clear to Send
15-16
RTS
Output
Request to Send
