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CP2105-EK

Rev. 0.5

3

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

Summary of Contents for CP2105

Page 1: ...ftware 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 ins...

Page 2: ...the other end of the USB cable to the USB connector on the CP2105 evaluation board 3 Connect one end of the RS232 serial cable to the DB 9 connector on the CP2105 evaluation board 4 Connect the other end of the RS232 serial cable to the target serial device 5 Optional Connect the second RS232 serial cable to the second DB 9 connector on the CP2105 evaluation board 6 Optional Connect the other end ...

Page 3: ...rom 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 US...

Page 4: ...nnector DSS DS4 Green GPIO LEDs DS5 Red SUSPEND indicator LED 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 communicatio...

Page 5: ...d 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 ...

Page 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 J7 2 3 connects CP2105 Enhan...

Page 7: ...CP2105 EK Rev 0 5 7 7 Schematic Figure 4 CP2105 Evaluation Board Schematic ...

Page 8: ...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 ...

Page 9: ...CP2105 EK Rev 0 5 9 NOTES ...

Page 10: ...sumes no responsibility for errors and omissions and disclaims responsibility for any consequences resulting from the use of information included herein Additionally Silicon Laboratories assumes no responsibility for the functioning of undescribed features or parameters Silicon Laboratories reserves the right to make changes without further notice Silicon Laboratories makes no warranty rep resenta...

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