CP2105 User s Guide

CP2105-EK
CP2105 E VALUATION K IT U SER ’ S G UIDE
1. Kit Contents
The CP2105 Evaluation Kit contains the following items:
CP2105
Evaluation Board
RS232 Serial Cable
USB Cable
DVD
Quick Start Guide
2. Relevant Documentation
Application notes can be found on the Interface Application Notes page for all fixed-function devices:
www.silabs.com/interface-appnotes.
AN721:
CP210x/CP211x Device Customization Guide — Customize the VID, PID, serial number, and
other parameters stored in the CP2105 one-time programmable ROM.
AN197: Serial Communications Guide for CP210x — Programming guide for using the Virtual COM Port
(VCP) drivers.
AN169: USBXpress Programmer’s Guide — Programming guide for using the USBXpress drivers.
AN220: C8051F32x and CP210x USB Driver Customization — VCP or USBXpress driver customization
tool.
AN223: Port Configuration and GPIO for CP210x — Programming guide and DLL for runtime control of
the CP2105 GPIO pins.
AN571: CP210x Virtual COM Port Interface — USB interface details for CP210x devices.
3. Software Setup
The Software Development Kit (SDK) for the CP2105 kit is included on the kit DVD. The latest version of this
installer can also be downloaded from the www.silabs.com/interface-software website. This package includes:
Device
Customization Utility (AN721)
Documentation — data sheet, application notes, user’s guide, quick start guide, etc.
CP210x Virtual COM Port (VCP) Drivers
Software — Driver Customization Utility (AN220) and programming examples
The Windows installer should launch automatically after inserting the DVD. For Mac and Linux, browse to the
appropriate directory on the DVD to install the software package. Follow the instructions to install the SDK and
drivers to the system.
3.1. USBXpress Driver Development Kit
The Silicon Laboratories USBXpress® Development Kit provides a complete host software solution for interfacing to
CP210x devices. No USB protocol or host device driver expertise is required. Instead, a simple, high-level Application
Program Interface (API) for the host software is used to provide complete USB connectivity. The USBXpress
Development Kit includes Windows device drivers, Windows device driver installer, host interface function library
(host API) provided in the form of a Windows Dynamic Link Library (DLL). See Application Note AN169, “USBXpress
Programmer’s Guide” for detailed information on using the USBXpress drivers.
The USBXpress drivers are available here: www.silabs.com/usbxpress.
Click the USBXpress Development Kit link in the Download for Windows 2000/XP/Server 2003/Vista/Win7 section
to download the USBXpress drivers. Run the installer and follow the steps to install the software to the desired
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Copyright © 2013 by Silicon Laboratories
CP2105-EK
CP2105-EK
location. The default installation directory is C:\SiLabs\MCU\USBXpress_SDK.
Further installation instructions for the WinCE drivers can be found in the ReadMe.txt file contained inside the
driver package.
4. CP2105 Hardware Interface
The evaluation board is connected to a PC as shown in Figure 1.
1.
2.
3.
4.
5.
Connect one end of the USB cable to a USB Port on the PC.
Connect the other end of the USB cable to the USB connector on the CP2105 evaluation board.
Connect one end of the RS232 serial cable to the DB-9 connector on the CP2105 evaluation board.
Connect the other end of the RS232 serial cable to the target serial device.
(Optional) Connect the second RS232 serial cable to the second DB-9 connector on the CP2105 evaluation
board.
6. (Optional) Connect the other end of the second RS232 serial cable to the second target serial device.
1
2
USB
3
4
RS232
Serial Device
CP2105 USB-toUART Bridge
RS232
5
Serial Device
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Figure 1. Hardware Setup
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5. CP2105 Software Interface
If the Virtual COM Port drivers are used, the CP2105 will appear as two COM ports in the Device Manager, as
shown in Figure 2. The CP2105 will always use the lowest available COM ports for operation. For instance, if COM
ports 1 and 2 are in use by other peripherals and applications, the CP2105 will use COM 3 and COM 4.
The CP2105 functions identically to two COM ports from the reference point of both the host application and the
serial devices, and it can support serial device control requests defined in the Microsoft Win32® Communications
API. Examples for how to communicate with the device as two serial COM ports are included in AN197 on the
www.silabs.com/interface-appnotes page or in the SDK.
If the USBXpress drivers are used, the CP2105 will appear as two USB USBXpress devices as shown in Figure 2.
Examples for how to communicate with the device using the USBXpress interface are included in AN169 on the
www.silabs.com/interface-appnotes page.
Figure 2. CP2105 in Device Manager
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3
CP2105-EK
6. Target Board
The CP2105 Evaluation Kit includes an evaluation board with a CP2105 device preinstalled for evaluation and preliminary software development. Numerous input/output (I/O) connections are provided to facilitate prototyping using
the evaluation board. Refer to Figure 3 for the locations of the various I/O connectors.
P1
P2
P3
J1
J2, J3
J4
J6
J7, J8
DSS–DS4
DS5
USB connector for USB interface
DB9 connector for Standard RS232 interface
DB9 connector for Enhanced RS232 interface
Enhanced UART signal access connector
GPIO access connector
Power connector
Standard UART signal access connector
SUSPEND LED source connector
Green GPIO LEDs
Red SUSPEND indicator LED
J6
CP2105-EK
P3
J2
DS0
DS1
RS232
Transceiver
Pin 1
Enhanced
Pin 2
P1
J8
______
CP2105
J7
SUSPEND LED
DS5
P2
RS232
Transceiver
Pin 1
J3
Standard
Pin 2
J4
J1
DS2
DS3
DS4
Figure 3. CP2105 Evaluation Board with Default Shorting Blocks Installed
6.1. LED Headers (J2, J3)
Connectors J2 and J3 are provided to allow access to the GPIO pins on the CP2105 when in GPIO mode. Place
shorting blocks on J2 and J3 to connect the GPIO pins to the five green LEDs DS0–DS4. These LEDs can be used
to indicate active communications through the CP2105. Table 1 shows the LED corresponding to each header
position. When using the CP2105 in Modem mode, the shorting blocks on J2 and J3 should be removed.
Table 1. J2 and J3 LED Locations
4
LED
Pins
DS0
J2[1:2]
DS1
J2[3:4]
DS2
J3[1:2]
DS3
J3[3:4]
DS4
J3[5:6]
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CP2105-EK
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.
Table 2. USB Connector Pin Descriptions
Pin #
Description
1
2
3
4
VBUS
DD+
GND (Ground)
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 3. RS232 Pin Descriptions
Pin
Signal
1
2
3
4
5
6
7
8
9
DCD
RXD
TXD
DTR
GND
DSR
RTS
CTS
RI
CP2105
Direction
Input
Input
Output
Output
Input
Output
Input
Input
Description
Data Carrier Detect
Receive Data
Transmit Data
Data Terminal Ready
Ground
Data Set Ready
Request to Send
Clear to Send
Ring Indicator
Table 4. J1, J6 Pin Descriptions
Pins
Signal
CP2105
Direction
Description
1-2
3-4
5-6
7-8
9-10
11-12
13-14
15-16
TXD
RXD
DTR
RI
DCD
DSR
CTS
RTS
Output
Input
Output
Input
Input
Input
Input
Output
Transmit Data
Receive Data
Data Terminal Ready
Ring Indicator
Data Carrier Detect
Data Set Ready
Clear to Send
Request to Send
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6.4. Power Connector (J4)
This header (J4) is included on the evaluation board to provide several power options. The following describes the
functions of the pins.
Pins
1–2 connect CP2105 VIO input (Pin 5) to CP2105 VDD (Pin 6). Remove the shorting block to power
VIO from an external source.
Pins 3–4 connect the main +3 V net to the CP2105 VDD (Pin 6). The main +3 V net powers the other
components (five green LEDs and RS-232 Sipex Part) on the board.
6.5. SUSPEND LED Source Selector(J7, J8)
These headers (J7, J8) are included on the evaluation board to provide several options for the SUSPEND LED
source. The following describes the function of each pin:
J7[1:2]
connects CP2105 Standard UART SUSPEND output (Pin 1) to the SUSPEND LED.
connects CP2105 Enhanced UART SUSPEND output (Pin 17) to the SUSPEND LED.
J7[2]:J8[1] connects the main +3 V net to the SUSPEND LED. This will cause the SUSPEND LED to act as
a power LED.
J7[2:3]
6
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Figure 4. CP2105 Evaluation Board Schematic
CP2105-EK
7. Schematic
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CP2105-EK
DOCUMENT CHANGE LIST
Revision 0.1 to Revision 0.2

Updated Windows installation instructions for VCP
drivers.
 Updated Windows installation instructions for
USBXpress drivers.
Revision 0.2 to Revision 0.3

Updated Figure 3 with shorting blocks installed.
Revision 0.3 to Revision 0.4

Updated "Figure 2. CP2105 in Device Manager" on
page 3.
Revision 0.4 to Revision 0.5

Updated “1. Kit Contents” to change CD-ROM to
DVD.
 Added “2. Relevant Documentation”.
 Updated “3. Software Setup” to point to the drivers
on the website.
 Updated Figure 1 and Figure 2.
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CP2105-EK
NOTES:
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CP2105-EK
CONTACT INFORMATION
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Austin, TX 78701
Tel: 1+(512) 416-8500
Fax: 1+(512) 416-9669
Toll Free: 1+(877) 444-3032
Please visit the Silicon Labs Technical Support web page:
https://www.silabs.com/support/pages/contacttechnicalsupport.aspx
and register to submit a technical support request.
Patent Notice
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