User Guide

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5.2 UART Interface (J1 and J5)

A RS232 transceiver circuit and DB9 connector (J5) are provided on the evaluation board to connect the CP2102N to external serial

devices.

Table 5.3. RS232 Pin Descriptions

Pin Signal CP2102N Direction Description

1 DCD Output Data Carrier Detect

2 RXD Input Receive Data

3 TXD Output Transmit Data

4 DTR Input 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

The J1 connector is provided to facilitate direct access to the CP2102N UART signals. Shorting blocks on J1 are required to connect

the UART signals to the J5 DB9 connector.

Table 5.4. J1 Pin Descriptions

Pins Signal CP2102N Direction Description

15-16 TXD Output Transmit Data

13-14 RXD Input Receive Data

11-12 DTR Output Data Terminal Ready

9-10 RI / CLK Input / Output Ring Indicator / Clock Output

7-8 DCD Input Data Carrier Detect

5-6 DSR Input Data Set Ready

3-4 CTS Input Clear to Send

1-2 RTS Output Request to Send

Note: To measure power of the CP2102N and achieve lowest power consumption, remove R22 and populate R12. This allows the

Sipex RS232 transceiver to enter shutdown mode when it is not receiving RS232 signals. The transceiver leaves shutdown mode only

when it receives RS232 signals (+-3V) on RxIN, not digital signals on TxIN.

UG205: CP2102N-EK Kit User's Guide

Hardware Overview

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