CP2102

CP2102_V01 SILABS | Alldatasheet

Document overview

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Technical content

Figure 1. Example System Diagram

48 MHz

of the CP2102/9. See the Silicon Labs website (www.silabs.com/usbxpress) for more information.

2 Rev. 1.8

Rev. 1.8 3 TABLE OF CONTENTS Section Page

4 Rev. 1.8 1. System Overview The CP2102/9 is a highly-integrated USB-to-UART Bridge Controller providing a simple solution for updating RS- 232 designs to USB using a minimum of components and PCB space. The CP2102/9 includes a USB 2.0 full- speed function controller, USB transceiver, oscillator, EEPROM or EPR OM, and asynchronous serial data bus (UART) with full modem control signals in a compact 5 x 5 mm QFN-28 package. No other external USB components are required. The on-chip programmable ROM may be used to customiz e the USB Vendor ID, Product ID, Product Description String, Power Descriptor, Device Release Number, and Device Serial Number as de sired for OEM applications. The programmable ROM is programmed on-board via th e USB, allowing the programming step to be easily integrated into the product manufacturing and testing process. Royalty-free Virtual COM Port (VCP) device drivers provided by Silic on Laboratories a llow a CP2102/9-based product to appear as a COM port to PC applications . The CP2102/9 UART interface implements all RS-232 signals, including control and handshaki ng signals, so existing system firmwa re does not need to be modified. In many existing RS-232 designs, all that is required to update the design from RS-232 to USB is to replace the RS- 232 level-translator with the CP2102/9. Direct access driver support is available through th e Silicon Laboratories USBXpress driver set. An evaluation kit for the CP2102 (Part Number: CP2102EK) is available. The kit includes a CP2102-based USB-to- UART/RS-232 evaluation board, a complete set of VC P device drivers, USB and RS-232 cables, and full documentation. Contact a Silicon Labs sales representative or go to www.silabs.com to order the CP2102 Evaluation Kit. The CP2102 Evaluation Kit serves as an evaluation kit for both the CP2102 and CP2109.

Table 1. Product Selection Guide *Note: Pin compatible with the CP2101-GM.

1. Electrical Specifications

Table 2. Absolute Maximum Ratings maximum rating conditions for extended periods may affect device reliability.

Table 3. Recommended Operating Conditions

1. The USB Pull-up supply current values are calculated values based on USB specifications. USB Pull-up supply current

is current flowing from VDD to GND through USB pull-down/pull-up resistors on D+ and D-.

1. Thermal resistance assumes a multi-layer PCB with any exposed pad soldered to a PCB pad.
2. USB Pull-up current should be added for total supply current. Normal and suspended supply current is current flowing

into VREGIN. Normal and suspended supply current is guaranteed by characterization.

Table 4. UART and Suspend I/O DC Electrical Characteristics Table 5. Reset Electrical Characteristics

Table 6. Voltage Regulator Electrical Specifications –40 to +85 °C unless otherwise specified. *Note: The maximum regulator supply current is 100 mA. Table 7. USB Transceiver Electrical Specifications VDD = 3.0 V to 3.6 V, –40 to +85 °C unless otherwise specified. *Note: Refer to the USB Specification for timing diagrams and symbol definitions.

Table 8. EPROM Electrical Characteristics

1. Pinout and Package Definitions

Table 9. CP2102/9 Pin Definitions 3.0–3.6 V Power Supply Voltage Input. 3.3 V Voltage Regulator Output. See "10. Voltage Regulator" on page 19. capacitor to maintain board compatibility with the CP2109.

113 D Out This pin is driven low when the CP2102/9 enters the USB suspend

1. For CP2102, pin is no connect (NC).
2. For CP2109, pin is VPP. VPP can be left unconnected when not used for in-application programming.
3. Pins can be left unconnected when not used.

Figure 2. QFN-28 Pinout Diagram (Top View)

1. QFN-28 Package Specifications

Figure 3. QFN-28 Package Drawing Table 10. QFN-28 Package Dimensions

1. All dimensions shown are in millimeters (mm) unless otherwise noted.
2. Dimensioning and Tolerancing per ANSI Y14.5M-1994.
3. This drawing conforms to the JEDEC Solid State Outline MO-220, variation VHHD except for

custom features D2, E2, Z, Y , and L, which are toleranced per supplier designation.

1. Recommended card reflow profile is per the JEDEC/IPC J-STD-020 specification for Small Body

Figure 4. QFN-28 Recommended PCB Land Pattern Table 11. QFN-28 PCB Land Pattern Dimensions

1. All dimensions shown are in millimeters (mm) unless otherwise noted.
2. Dimensioning and Tolerancing is per the ANSI Y14.5M-1994 specification.
3. This Land Pattern Design is based on the IPC-7351 guidelines.
4. All metal pads are to be non-solder mask defined (NSMD). Clearance between the solder

mask and the metal pad is to be 60 µm minimum, all the way around the pad.

1. A stainless steel, laser-cut and electro-polished stencil with trapezoidal walls should be used

to assure good solder paste release.

1. The stencil thickness should be 0.125 mm (5 mils).
2. The ratio of stencil aperture to land pad size should be 1:1 for all perimeter pins.
3. A 3x3 array of 0.90 mm openings on a 1.1 mm pitch should be used for the center pad to

assure the proper paste volume (67% Paste Coverage).

1. A No-Clean, Type-3 solder paste is recommended.
2. The recommended card reflow profile is per the JEDEC/IPC J-STD-020 specification for Small

1. USB Function Controller and Transceiver

commands for controlling the function of the UART. are also asserted after a CP2102/9 reset until device configuration during USB Enumeration is complete. SUSPEND and SUSPEND signals are de-asserted. Figure 5. Typical Connection Diagram

6 VDD

Option 1: A 4.7 k pull-up resistor can be added to increase noise immunity. Option 2: A 4.7 µF capacitor can be added if powering other devices from the on-chip regulator. Option 3: Avalanche transient voltage suppression diodes should be added for ESD protection. Option 3: Use Littlefuse p/n SP0503BAHT or equivalent. Option 4: 10 k resistor to ground to hold SUSPEND low on initial power on or device reset. Option 5: A 4.7 µF capacitor can be added for in-system programming (CP2109 only).

1. Asynchronous Serial Data Bus (UART) Interface

Table 12. Data Formats and Baud Rates

1. Additional baud rates are supported. See “AN721: CP210x/CP211x Device Customization Guide”.

1. Internal Programmable ROM

CP2109 includes an internal one-time programmable (OTP) erasable programmable read-only memory (EPROM). be written one time and cannot be erased. number management during manufacturing. write to the configuration ROM. Table 13. Default USB Configuration Data

18 Rev. 1.8 9. CP2102/9 Device Drivers There are two sets of device drivers available for the CP 2102/9 devices: the Virtual COM Port (VCP) drivers and the USBXpress Direct Access drivers. Only one set of drivers is necessary to interface with the device. The latest drivers are available at http://www.silabs.com/support/Pages/software-downloads.aspx. 9.1. Virtual COM Port Drivers The CP2102/9 Virtual COM Port (VCP) device drivers allow a CP2102/9-based device to appear to the PC's application software as a COM port. Application software running on the PC accesses the CP2102/9-based device as it would access a standard hardware COM port. However, actual data transfer between the PC and the CP2102/ 9 device is performed over the USB in terface. Therefore, existing COM port applications may be used to transfer data via the USB to the CP2102/9-based device witho ut modifying the application. See “AN197: Serial Communications Guide for the CP210x” for Example Code for Interfacing to a CP2102/9 using the Virtual COM drivers. 9.2. USBXpress Drivers The Silicon Laboratories USBXpress driv ers provide an alternate solution for interfacin g with CP2102/9 devices. No Serial Port protocol expertise is required. Instead, a simple, high-level application program interface (API) is used to provide simpler CP210x c onnectivity and functiona lity. The USBXpress for CP210x Development Kit includes Windows device drivers, Windows device driver installer and uninstallers, and a host interface function library (host API) provided in the fo rm of a Windows Dynamic Link Libr ary (DLL). The USBXpress driver set is recommended for new products that also include new PC software. The USBXpress interface is described in “AN169: USBXpress ® Programmer's Guide.” 9.3. Driver Customization In addition to customizing the device as described in "8. Internal Programmable ROM" on page 17, the drivers and the drivers installation package can be also be cust omized. See “AN220: USB Driv er Customization” for more information on generating customized VCP and USBXpress drivers. 9.4. Driver Certification The default drivers that are shipped with the CP2102/9 are Microsoft WHQL (Windows Hardware Quality Labs) certified. The certification means that the drivers have been tested by Microsoft and their latest operating systems (2000, Server 2003, XP , Vista, 7, and 8) will allow the drivers to be installed without an y warnings or errors. Some installations of Windows will prevent unsigned drivers from being installed at all. The customized drivers that are generated using the AN220 software are not automati cally certified. They must first go through the Microsoft Driver Reseller Submission process. Contac t Silicon Laboratories support for assistance with this process.

be used to power external 3 V devices. See Table 6 for the voltage regulator electrical characteristics. absolute maximum voltage on VBUS specification in Table 2. Figure 6. Configuration 1: USB Bus-Powered

3 V Out

Figure 7. CP2102 Configuration 2: USB Self-Powered Figure 8. CP2109 Configuration 2: USB Self-Powered

Figure 9. CP2102 Configuration 3: USB Self-Powered, Regulator Bypassed Figure 10. CP2109 Configuration 3: USB Self-Powered, Regulator Bypassed

1. Porting Considerations from CP2102 to CP2109

updated, cost-reduced version of the CP2102 with a one-time programmable ROM. EPROM has been successfully programmed or if the CP2109 does not need to be customized in system. EPROM can only be written one time. The CP2109 may require an additional capacitor on VPP if in-application programming is desired. CP2109. Refer to "3. Electrical Specifications" on page 6 for the comprehensive electrical specifications. Table 14. Differences in Absolute Maximum Specifications between CP2102 and CP2109 Table 15. Differences in Electrical Specifications between CP2102 and CP2109

Table 15. Differences in Electrical Specifications between CP2102 and CP2109 (Continued)

24 Rev. 1.8 12. Relevant Application Notes The following application notes are applicable to the CP2102/9. The latest versions of these application notes and their accompanying software are available at: http://www.silabs.com/products/mcu/Pages/ApplicationNotes.aspx.  AN169: USBXpress® Programmer's Guide—This application note describes the USBXpress API interface and includes example code.  AN197: Serial Communications Guide for the CP210x—This application note describes how to use the standard Windows COM port function to communicate with the CP2102/9 and includes example code.  AN220: USB Driver Customization—This application note describes how to use the AN220 software to customize the VCP or USBXpress drivers with OEM information.  AN721: CP210x/CP211x Device Customization Guide—This application note describes how to use the AN721 software to configure the USB parameters on the CP2102/9 devices.

Rev. 1.8 25 DOCUMENT CHANGE LIST Revision 1.0 to Revision 1.1  Updated “Linux 2.40” bullet on page 1.  Changed MLP to QFN throughout. Revision 1.1 to Revision 1.2  Added additional supported operating systems on page 1.  Changed VDD conditions of Tables 3 and 4 from a minimum of 2.7 to 3.0 V.  Updated typical and max Supply Current number in Table 3.  Removed tantalum requirement in Figure 5.  Consolidated Sections 8 and 9.  Added Section "12. Relevant Application Notes" on page 24. Revision 1.2 to Revision 1.3  Updated Figure 1 on page 1.  Updated Figure 5 on page 15.  Updated Maximum VBUS Detection Input Threshold in Table 6 on page 9. Revision 1.3 to Revision 1.4  Updated Table 4 RST Input Low Voltage  Updated Table 10, Note 4.  Updated Table 11, Note 10. Revision 1.4 to Revision 1.5  Added CP2109.  Updated Single-Chip USB to UART Data Transfer bullet on page 1.  Added CP2109 to Ordering Part Numbers on page  Updated Section "1. System Overview" on page 4.  Updated Figure 1.  Added Section "2. Ordering Information" on page 5.  Added Symbol columns to Tables in Section "3. Electrical Specifications" on page 6.  Updated Table 3. - Added CP2109, Note 1, Note 2. - Updated thermal resistance spec. - Updated normal supply current spec.  Updated Table 4, added CP2109, added Baud Rate.  Updated Table 5, added CP2109, added VDD Ramp Time.  Moved Table 6.  Updated Table 6, added CP2109.  Added Table 7.  Added Table 8.  Updated Table 9. - Updated pin 18 spec, Note 1, Note 2.  Updated Figure 2, added CP2109, pin 18.  Updated Section "6. USB Function Controller and Transceiver" on page 15, added CP2109.  Updated Figure 5, added CP2109, Option 5.  Updated Section "8. Internal Programmable ROM" on page 17, added CP2109.  Updated Table 12. - Updated Note 2 app note reference.  Updated Table 13. - Added CP2109.  Updated Table 15. - Updated normal maximum and suspended maximum supply current specs.  Updated Section "10. Voltage Regulator" on page 19, changed AN144 to AN721.  Added Section "11. Porting Considerations from CP2102 to CP2109" on page 22.  Updated "11.2. Distinguishing Factors" on page 22. - Updated CP2102 default serial number to “0001”.  Updated Section "12. Relevant Application Notes" on page 24. - Replaced AN144/AN205 with AN721. Revision 1.5 to Revision 1.6  Added mention of VBUS in Table 2, “Absolute Maximum Ratings,” on page 6 and split out port I/O maximums for CP2102 and CP2109.  Added VPP voltage specifications to Table 8, “EPROM Electrical Characteristics,” on page 10.  Updated "10. Voltage Regulator" on page 19 to add CP2109 absolute maximum voltage on VBUS requirements in self-powered systems.  Updated "11.3. Differences in Electrical Specifications" on page 22 to include the new or modified specifications. Revision 1.6 to Revision 1.7  Added Note to front page. Revision 1.7 to Revision 1.8 January 20, 2017  Revised front page note.

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