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Preliminary
CP2101
Single-Chip USB to UART Bridge
SINGLE-CHIP USB to UART DATA TRANSFER - Integrated USB Transceiver; No External Resistors VIRTUAL COM PORT DEVICE DRIVERS - Works with Existing COM Port PC Applications - Royalty-Free Distribution License - Windows 98/Me/2000/XP - MAC OS-9 - MAC OS-X - Windows CE * - Linux 2.40 and greater *
* (Contact factory for availability)
Required Integrated Clock; No External Crystal Required Integrated 512-Byte EEPROM for Vendor ID, Product ID, Serial Number, Power Descriptor, Release Number and Product Description Strings On-Chip Power-On Reset Circuit On-Chip Voltage Regulator: 3.3V Output
USB FUNCTION CONTROLLER - USB Specification 2.0 Compliant; Full Speed (12 Mbps) - USB suspend states supported via SUSPEND pins ASYNCHRONOUS SERIAL DATA BUS (UART) - All Handshaking and Modem Interface Signals - Data Formats Supported: * Data Bits: 8 * Stop Bits: 1, 2 * Parity: Odd, Even, No Parity - Baud Rates: 300bps to 921.6kbps - 512 Byte Receive Buffer; 512 Byte Transmit Buffer - Hardware or X-On / X-Off Handshaking Supported - Event Character and Line Break Condition Support
EXAMPLE APPLICATIONS - Upgrade of RS-232 Legacy Devices to USB - Cellular Phone USB Interface Cable - PDA USB Interface Cable - USB to RS-232 Serial Adapter SUPPLY VOLTAGE - Self-powered: 3.0V to 3.6V - USB Bus Powered: 4.0V to 5.25V PACKAGE - 28-pin MLP (5mm X 5mm) TEMPERATURE RANGE: -40C TO +85C
Example Circuit Diagram
7
C2 1uF
REGIN
IN
Voltage Regulator
OUT
CP2101
/RST SUSPEND 9 12 11
6
C1 4.7uF TANT
VDD
3.3V
(to external circuitry for USB suspend states)
/SUSPEND
3
GND
RI
2 1 28 27 26 25 24 23
8
USB CONNECTOR VBUS DD+ GND
6 5 1
2 3
VBUS
48MHz Oscillator
DCD DTR DSR TXD RXD RTS CTS
C3 0.1uF
External RS-232 transceiver or UART circuitry
5 4
DD+
4
USB Transceiver
USB Function Controller 512B 512B 512B Xmit Rcv EEPROM Buffer Buffer
UART
DS014-1.0 AUG03
CYGNAL Integrated Products, Inc. (c) 2003
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CP2101
Preliminary
Notes
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DS014-1.0 AUG03 (c) 2003 Cygnal Integrated Products, Inc.
Preliminary
TABLE OF CONTENTS
CP2101
1. SYSTEM OVERVIEW ...........................................................................................................5 2. ABSOLUTE MAXIMUM RATINGS ....................................................................................5 Table 2.1. Absolute Maximum Ratings* ..................................................................................5 3. GLOBAL DC ELECTRICAL CHARACTERISTICS ........................................................6 Table 3.1. Global DC Electrical Characteristics .......................................................................6 4. PINOUT AND PACKAGE DEFINITIONS..........................................................................6 Table 4.1. Pin Definitions for the CP2101................................................................................6 Figure 4.1. MLP-28 Pinout Diagram (Top View) .....................................................................7 Figure 4.2. MLP-28 Package Drawing ......................................................................................8 Table 4.2. MLP-28 Package Dimensions .................................................................................8 Figure 4.3. Typical MLP-28 Landing Diagram .........................................................................9 Figure 4.4. Typical MLP-28 Solder Mask ...............................................................................10 5. USB FUNCTION CONTROLLER AND TRANSCEIVER ..............................................11 6. ASYNCHRONOUS SERIAL DATA BUS (UART) INTERFACE ...................................11 Table 6.1. Data Formats and Baud Rates................................................................................11 7. INTERNAL EEPROM..........................................................................................................12 Table 7.1. Default USB Configuration Data...........................................................................12 8. VIRTUAL COM PORT DEVICE DRIVERS.....................................................................12 9. VOLTAGE REGULATOR...................................................................................................13 Table 9.1. Voltage Regulator Electrical Specifications ..........................................................13
(c) 2003 Cygnal Integrated Products, Inc. DS014-1.0 AUG03
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CP2101
Preliminary
Notes
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DS014-1.0 AUG03 (c) 2003 Cygnal Integrated Products, Inc.
Preliminary
1. SYSTEM OVERVIEW
CP2101
The CP2101 is a highly-integrated USB-to-UART Bridge Controller providing a simple solution for updating RS232 designs to USB using a minimum of components and PCB space. The CP2101 includes a USB 2.0 full-speed function controller, USB transceiver, oscillator, EEPROM and asynchronous serial data bus (UART) with full modem control signals in a compact 5mm X 5mm MLP-28 package. No other external USB components are required. The on-chip EEPROM may be used to customize the USB Vendor ID, Product ID, Product Description String, Power Descriptor, Device Release Number and Device Serial Number as desired for OEM applications. The EEPROM is programmed on-board via the 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 Cygnal allow a CP2101-based product to appear as a COM port to PC applications. The CP2101 UART interface implements all RS232 signals, including control and handshaking signals, so existing system firmware does not need to be modified. In many existing RS232 designs, all that is required to update the design from RS232 to USB is to replace the RS232 level-translator with the CP2101. An evaluation kit for the CP2101 (Part Number: CP2101EK) is available. It includes a CP2101-based USB-toUART/RS232 evaluation board, a complete set of VCP device drivers, USB and RS232 cables and full documentation. Contact any of Cygnal's sales representatives or go to www.cygnal.com to order the CP2101 Evaluation Kit.
2.
ABSOLUTE MAXIMUM RATINGS
Table 2.1. Absolute Maximum Ratings*
PARAMETER CONDITIONS MIN -55 -65 -0.3 -0.3 TYP MAX 125 150 5.8 4.2 500 100 UNITS C C V V mA mA
Ambient temperature under bias Storage Temperature Voltage on any I/O Pin or /RST with respect to GND Voltage on VDD with respect to GND Maximum Total current through VDD and GND Maximum output current sunk by /RST or any I/O pin
*Note: stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device.
This is a stress rating only and functional operation of the devices at those or any other conditions above those indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.
(c) 2003 Cygnal Integrated Products, Inc. DS014-1.0 AUG03
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CP2101
3.
Preliminary
GLOBAL DC ELECTRICAL CHARACTERISTICS
Table 3.1. Global DC Electrical Characteristics
-40C to +85C unless otherwise specified PARAMETER Digital Supply Voltage Digital Supply Current with USB active Specified Operating Temperature Range VDD=3.3V -40 CONDITIONS MIN 3.0 TYP 3.3 TBD +85 MAX 3.6 UNITS V mA C
4.
PINOUT AND PACKAGE DEFINITIONS
Table 4.1. Pin Definitions for the CP2101
Name VDD GND /RST REGIN VBUS D+ DTXD RXD CTS RTS DSR DTR DCD RI Pin Number 6 Power Out 3.3 V Voltage Regulator Output. See Section 9. 3 9 7 8 4 5 26 25 23 24 27 28 1 2 D I/O Ground Device Reset. Open-drain output of internal POR or VDD monitor. An external source can initiate a system reset by driving this pin low for at least 15 s. Type Description
Power In 3.0-3.6 V Power Supply Voltage Input.
Power In 5 V Regulator Input. This pin is the input to the on-chip voltage regulator. D In D I/O D I/O D Out D In D In D Out D in D Out D In D In VBUS Sense Input. This pin should be connected to the VBUS signal of a USB network. A 5 V signal on this pin indicates a USB network connection. USB D+ USB DAsynchronous data output (UART Transmit) Asynchronous data input (UART Receive) Clear To Send control input (active low) Ready to Send control output (active low) Data Set Ready control output (active low) Data Terminal Ready control output (active low) Data Carrier Detect control input (active low) Ring Indicator control input (active low)
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Preliminary
Table 4.1. Pin Definitions for the CP2101
Name SUSPEND /SUSPEND NC Pin Number 12 11 10, 13-22 Type D Out D Out Description
CP2101
This pin is driven high when the CP2101 enters the USB Suspend state. This pin is driven low when the CP2101 enters the USB Suspend state. These pins should be left unconnected or tied to VDD.
Figure 4.1. MLP-28 Pinout Diagram (Top View)
DSR
RXD
DTR
TXD
RTS
CTS 23
28
27
26
25
24
GND DCD RI GND D+ DVDD REGIN 1 2 3 4 5 6
22
NC
21 20 19
NC NC NC NC NC NC NC
CP2101 Top View
18 17 16
GND 7 15
10
11
12
13 NC
/SUSPEND
SUSPEND
NC
VBUS
(c) 2003 Cygnal Integrated Products, Inc. DS014-1.0 AUG03
/RST
NC
14
8
9
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CP2101
Preliminary
Figure 4.2. MLP-28 Package Drawing
Bottom View
Table 4.2. MLP-28 Package Dimensions
15 D2 D2 2 E2 R 16 17 18 19 20 DETAIL 1 28 27 26 25 24 23 22 21 6xe E
A A1 A2 A3 b D D2 E E2 e L N ND NE R AA BB CC DD MIN 0.80 0 0 0.18 2.90 2.90 0.45 0.09 MM TYP 0.90 0.02 0.65 0.25 0.23 5.00 3.15 5.00 3.15 0.5 0.55 28 7 7 0.435 0.435 0.18 0.18 MAX 1.00 0.05 1.00 0.30 3.35 3.35 0.65 -
10
11
12
13
L 7
6 5 4 e b
2 1
6xe D
Side View
A2 A DD BB
A3
DETAIL 1 AA
CC
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DS014-1.0 AUG03 (c) 2003 Cygnal Integrated Products, Inc.
A1
e
E2 2
3
14
8
9
Preliminary
CP2101
Figure 4.3. Typical MLP-28 Landing Diagram
Top View
0.20 mm 0.50 mm 0.20 mm 0.30 mm 0.85 mm
0.50 mm D2 0.35 mm
0.50 mm
0.20 mm
Optional GND Connection
b
0.10 mm
L E2
0.20 mm
0.30 mm
e
0.50 mm 0.10 mm
0.35 mm
0.85 mm
E
(c) 2003 Cygnal Integrated Products, Inc. DS014-1.0 AUG03
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D
CP2101
Preliminary
Figure 4.4. Typical MLP-28 Solder Mask
Top View
0.50 mm 0.20 mm 0.20 mm 0.30 mm 0.85 mm
0.50 mm 0.60 mm 0.60 mm 0.70 mm 0.30 mm 0.20 mm 0.40 mm D2 0.35 mm
0.50 mm
0.20 mm
b
0.10 mm
L
e
E2
0.20 mm
0.30 mm
0.50 mm 0.10 mm
0.35 mm
0.85 mm
E
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DS014-1.0 AUG03 (c) 2003 Cygnal Integrated Products, Inc.
D
Preliminary
5.
CP2101
USB FUNCTION CONTROLLER AND TRANSCEIVER
The Universal Serial Bus function controller in the CP2101 is a USB 2.0 compliant full-speed device with integrated transceiver and on-chip matching and pull-up resistors. The USB function controller manages all data transfers between the USB and the UART as well as command requests generated by the USB host controller and commands for controlling the function of the UART. The USB Suspend and Resume signals are supported for power management of both the CP2101 device as well as external circuitry. The CP2101 will enter Suspend mode when Suspend signaling is detected on the bus. On entering Suspend mode, the CP2101 asserts the SUSPEND and /SUSPEND signals. SUSPEND and /SUSPEND are also asserted after a CP2101 reset until device configuration during USB Enumeration is complete The CP2101 exits the Suspend mode when any of the following occur: (1) Resume signaling is detected or generated, (2) a USB Reset signal is detected, or (3) a device reset occurs. On exit of Suspend mode, the SUSPEND and /SUSPEND signals are de-asserted. Note: both SUSPEND and /SUSPEND temporarily float high during a CP2101 reset. If this behavior is undesirable, a strong pull-down (10K ohms) can be used to ensure /SUSPEND remains low during reset.
6.
ASYNCHRONOUS SERIAL DATA BUS (UART) INTERFACE
The CP2101 UART interface consists of the TX (transmit) and RX (receive) data signals as well as the RTS, CTS, DSR, DTR, DCD and RI control signals. The UART supports RTS/CTS, DSR/DTR and X-On/X-Off handshaking. The UART is programmable to support a variety of data formats and baud rates. The data format and baud rate programmed into the UART is set during COM port configuration on the PC. The data formats and baud rates available are listed in Table 6.1.
Table 6.1. Data Formats and Baud Rates
Data Bits Stop Bits Parity Type Baud Rates 8 1 None, Even, Odd 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
(c) 2003 Cygnal Integrated Products, Inc. DS014-1.0 AUG03
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CP2101
7. INTERNAL EEPROM
Preliminary
The CP2101 includes an internal EEPROM which may be used to customize the USB Vendor ID, Product ID, Product Description String, Power Descriptor, Device Release Number and Device Serial Number as desired for OEM applications. Customization of the USB configuration data is optional. If the EEPROM is not programmed with OEM data, the default configuration data shown in Table 6.1 is used. Note, however, a unique serial number is required for OEM applications in which it is possible for multiple CP2101-based devices to be connected to the same PC. The internal EEPROM is programmed via the USB. This allows the OEM's USB configuration data and serial number to be written to the CP2101 on-board during the manufacturing and testing process. A stand-alone utility for programming the internal EEPROM is available from Cygnal. A library of routines provided in the form of a Windows DLL is also available. This library can be used to integrate the EEPROM programming step into custom software used by the OEM to streamline testing and serial number management during manufacturing. The EEPROM has a typical endurance of 100,000 write cycles with a data retention of 100 years.
Table 7.1. Default USB Configuration Data
NAME Vendor ID Product ID Power Descriptor (Attributes) VALUE 10C4h EA60h 80h
Power Descriptor (Max. Power) 0Fh Release Number Serial Number Product Description String 0100h 0001 (63 characters maximum) "Cygnal CP2101 USB to UART Bridge Controller" (126 characters maximum)
8.
VIRTUAL COM PORT DEVICE DRIVERS
The CP2101 Virtual COM Port (VCP) device drivers allow a CP2101-based device to appear to the PC's application software as an additional COM port (in addition to any existing hardware COM ports). Application software running on the PC accesses the CP2101-based device as it would access a standard hardware COM port. However, actual data transfer between the PC and the CP2101 device is performed over the USB. Therefore, existing COM port applications may be used to transfer data via the USB to the CP2101-based device without modifying the application. Contact Cygnal Integrated Products for the latest list of supported operating systems. Note: the Cygnal VCP device drivers are required for device operation and are only distributed as part of the CP2101 Evaluation Kit (Part Number: CP2101EK). Contact any of Cygnal's sales representatives or go to www.cygnal.com to order the CP2101 Evaluation Kit.
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Preliminary
9. VOLTAGE REGULATOR
CP2101
The CP2101 is designed to be a USB bus-powered device taking power from the USB VBUS signal. It includes an on-chip 5 V-to-3 V voltage regulator for this purpose. The 3 V output of the voltage regulator appears on the VDD pin allowing external 3 V devices to be powered from the USB. See Table 9.1 for the voltage regulator's electrical specifications. Note: both the VBUS and REGIN pins of the CP2101 should always be connected to the USB VBUS signal. It is recommended that additional decoupling capacitance (ex. 0.1F in parallel with 1.0F) be provided on the REGIN input.
Table 9.1. Voltage Regulator Electrical Specifications
VDD = 3.0 V; -40C to +85C unless otherwise specified PARAMETER Input Voltage Range Output Voltage VBUS Detection Input Threshold Bias Current Output Current = 1 to 100 mA CONDITIONS MIN 4.0 3.0 1.0 3.3 1.8 90 TYP MAX UNITS 5.25 3.6 4.0 TBD V V V A
(c) 2003 Cygnal Integrated Products, Inc. DS014-1.0 AUG03
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CP2101
Disclaimers:
Preliminary
Life support: These products are not designed for use in life support appliances or systems where malfunction of these products can reasonably be expected to result in personal injury. Cygnal Integrated Products customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Cygnal Integrated Products for any damages resulting from such applications. Right to make changes: Cygnal Integrated Products reserves the right to make changes, without notice, in the products, including circuits and/or software, described or contained herein in order to improve design and/or performance. Cygnal Integrated Products assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work infringement, unless otherwise specified. CIP-51 is a trademark of Cygnal Integrated Products, Inc. MCS-51 and SMBus are trademarks of Intel Corporation. I2C is a trademark of Philips Semiconductor. SPI is a trademark of Motorola, Inc. USB is a trademark of Universal Serial Bus Implementers Forum, Inc.
CYGNAL INTEGRATED PRODUCTS 4301 Westbank Drive Suite B-100 Austin, TX 78746 www.cygnal.com
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DS014-1.0 AUG03 (c) 2003 Cygnal Integrated Products, Inc.

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