Silicon Laboratories CP2104, Руководство пользователя

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CP2104-EK
Rev. 0.7 5
6.3. UART Signals (P2, J1)
An RS232 transceiver circuit and DB9 connector (P2) are provided on the evaluation board to connect the CP2104
virtual serial port to external serial devices. See Table 3 for the RS232 P2 pin descriptions. The J1 connector is
provided to facilitate direct access to the CP2104’s UART signals. Shorting blocks on J1 are required to connect
the UART signals to P2. See Table 4 for J1 pin descriptions.
6.4. Power Connector (J4)
This header (J4) is included on the evaluation board to provide several power options. The following describes the
function of each pin:
 Pins 1–2: Connects CP2104 VIO input (Pin 5) to CP2104 VDD (Pin 6). Remove the shorting block to power
VIO from an external source.
 Pins 3–4: Connects the main +3 V net to the CP2104 VDD (Pin 6). The main +3 V net powers the other
components (four green LEDs and RS232 Sipex Part) on the evaluation board.
Table 3. RS232 Pin Descriptions
Pin Signal CP2104
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 Pin Descriptions
Pins Signal CP2104
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