CP2103-EK
Rev. 0.4
5
6.3. UART Signals (J1, J2)
A RS232 transceiver circuit and DB-9 connector (J1) are provided on the evaluation board to connect the CP2103
virtual serial port to external serial devices. See Table 3 for the RS232 J1 pin descriptions. The J2 connector is pro-
vided to facilitate direct access to the CP2103’s UART signals. Shorting blocks on J2 are required to connect the
UART signals to J1. See Table 4 for J2 pin descriptions.
6.4. Power Connectors (J4, J7)
Two headers, J4 and J7, are included on the evaluation board to provide several power options. The following
describes the function of each connector:
J4 - Connects the CP2103 VDD (pin 6) to the main +3 V net that powers the other components (4 green
LEDs and RS-232 Sipex Part) on the board.
J7 - Connects CP2103 VIO input (pin 5) to the main +3 V net. Remove the shorting block to power VIO
from an external source.
Table 3. RS232 Pin Descriptions
Pin
Signal
CP2103
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. J2 Pin Descriptions
Pins
Signal
CP2103
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
8-10
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
