ETC CP2101 Single-chip usb to uart bridge Datasheet

Preliminary
CP2101
Single-Chip USB to UART Bridge
SINGLE-CHIP USB to UART DATA TRANSFER
- Integrated USB Transceiver; No External Resistors
-
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
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)
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: -40°C TO +85°C
Example Circuit Diagram
7
REGIN
C2
1uF
IN
CP2101
Voltage
Regulator
/RST
OUT
SUSPEND
6
C1
4.7uF
TANT
3
8
USB
CONNECTOR
VBUS
DD+
GND
3.3V
VDD
/SUSPEND
GND
RI
48MHz
Oscillator
VBUS
DCD
C3
0.1uF
DTR
1
2
3
4
5
6
DS014-1.0 AUG03
5
4
DD+
USB
Transceiver
USB Function
Controller
UART
512B 512B
512B
Xmit
Rcv
EEPROM
Buffer Buffer
CYGNAL Integrated Products, Inc. © 2003
DSR
TXD
RXD
RTS
CTS
9
12
11
(to external circuitry
for USB suspend
states)
2
1
28
27
External RS-232
transceiver or
UART circuitry
26
25
24
23
Page 1
CP2101
Preliminary
Notes
Page 2
DS014-1.0 AUG03 © 2003 Cygnal Integrated Products, Inc.
Preliminary
CP2101
TABLE OF CONTENTS
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
© 2003 Cygnal Integrated Products, Inc. DS014-1.0 AUG03
Page 3
CP2101
Preliminary
Notes
Page 4
DS014-1.0 AUG03 © 2003 Cygnal Integrated Products, Inc.
Preliminary
1.
CP2101
SYSTEM OVERVIEW
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
TYP
MAX
UNITS
Ambient temperature under bias
-55
125
°C
Storage Temperature
-65
150
°C
Voltage on any I/O Pin or /RST with respect to
GND
-0.3
5.8
V
Voltage on VDD with respect to GND
-0.3
4.2
V
Maximum Total current through VDD and GND
500
mA
Maximum output current sunk by /RST or any
I/O pin
100
mA
*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.
© 2003 Cygnal Integrated Products, Inc. DS014-1.0 AUG03
Page 5
Preliminary
CP2101
3.
GLOBAL DC ELECTRICAL CHARACTERISTICS
Table 3.1. Global DC Electrical Characteristics
-40°C to +85°C unless otherwise specified
PARAMETER
CONDITIONS
Digital Supply Voltage
Digital Supply Current with USB active
TYP
MAX
UNITS
3.0
3.3
3.6
V
VDD=3.3V
Specified Operating Temperature Range
4.
MIN
TBD
-40
mA
+85
°C
PINOUT AND PACKAGE DEFINITIONS
Table 4.1. Pin Definitions for the CP2101
Name
Pin Number
VDD
6
Type
Description
Power In 3.0-3.6 V Power Supply Voltage Input.
Power Out 3.3 V Voltage Regulator Output. See Section 9.
GND
3
/RST
9
REGIN
7
VBUS
8
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.
D+
4
D I/O
USB D+
D-
5
D I/O
USB D-
TXD
26
D Out
Asynchronous data output (UART Transmit)
RXD
25
D In
Asynchronous data input (UART Receive)
CTS
23
D In
Clear To Send control input (active low)
RTS
24
D Out
Ready to Send control output (active low)
DSR
27
D in
Data Set Ready control output (active low)
DTR
28
D Out
DCD
1
D In
Data Carrier Detect control input (active low)
RI
2
D In
Ring Indicator control input (active low)
Page 6
Ground
D I/O
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 µs.
Power In 5 V Regulator Input. This pin is the input to the on-chip voltage regulator.
Data Terminal Ready control output (active low)
DS014-1.0 AUG03 © 2003 Cygnal Integrated Products, Inc.
Preliminary
CP2101
Table 4.1. Pin Definitions for the CP2101
Name
Pin Number
Type
Description
SUSPEND
12
D Out
This pin is driven high when the CP2101 enters the USB Suspend state.
/SUSPEND
11
D Out
This pin is driven low when the CP2101 enters the USB Suspend state.
NC
10, 13-22
These pins should be left unconnected or tied to VDD.
DTR
DSR
TXD
RXD
RTS
CTS
NC
27
26
25
24
23
22
GND
28
Figure 4.1. MLP-28 Pinout Diagram (Top View)
DCD
1
21
NC
RI
2
20
NC
GND
3
19
NC
D+
4
18
NC
D-
5
17
NC
VDD
6
16
NC
REGIN
7
15
NC
CP2101
Top View
8
9
10
11
12
13
14
VBUS
/RST
NC
/SUSPEND
SUSPEND
NC
NC
GND
© 2003 Cygnal Integrated Products, Inc. DS014-1.0 AUG03
Page 7
Preliminary
CP2101
Figure 4.2. MLP-28 Package Drawing
L
7
15
16
D2
5
17
D2
2
e
E2
4
18
19
E2
2
3
R
6xe
E
b
6
20
2
21
22
23
24
25
26
27
DETAIL 1
28
1
Table 4.2. MLP-28 Package
Dimensions
14
13
12
11
10
9
8
Bottom View
6xe
D
MAX
1.00
0.05
1.00
0.30
3.35
3.35
0.65
-
A1
e
A3
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
A
A2
Side View
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
-
DETAIL 1
CC
Page 8
DD
BB
AA
DS014-1.0 AUG03 © 2003 Cygnal Integrated Products, Inc.
Preliminary
CP2101
Figure 4.3. Typical MLP-28 Landing Diagram
0.50 mm
0.35 mm
0.50 mm
0.10 mm
0.85 mm
0.30 mm
0.20 mm
0.20 mm
0.50 mm
Top View
b
0.20 mm
D
D2
Optional
GND
Connection
L
e
E2
0.20 mm
0.30 mm
0.50 mm
0.85 mm
0.35 mm
0.10 mm
E
© 2003 Cygnal Integrated Products, Inc. DS014-1.0 AUG03
Page 9
Preliminary
CP2101
Figure 4.4. Typical MLP-28 Solder Mask
0.50 mm
0.35 mm
0.50 mm
0.60 mm
0.20 mm
0.10 mm
0.85 mm
0.30 mm
0.20 mm
0.20 mm
0.50 mm
Top View
0.60 mm
0.30 mm
0.70 mm
b
0.20 mm
D
D2
0.40 mm
e
L
E2
0.20 mm
0.30 mm
0.50 mm
0.85 mm
0.35 mm
0.10 mm
E
Page 10
DS014-1.0 AUG03 © 2003 Cygnal Integrated Products, Inc.
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
8
Stop Bits
1
Parity Type
None, Even, Odd
Baud Rates
300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
© 2003 Cygnal Integrated Products, Inc. DS014-1.0 AUG03
Page 11
Preliminary
CP2101
7.
INTERNAL EEPROM
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
VALUE
Vendor ID
10C4h
Product ID
EA60h
Power Descriptor (Attributes)
80h
Power Descriptor (Max. Power) 0Fh
Release Number
0100h
Serial Number
0001 (63 characters maximum)
Product Description String
“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.
Page 12
DS014-1.0 AUG03 © 2003 Cygnal Integrated Products, Inc.
Preliminary
9.
CP2101
VOLTAGE REGULATOR
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. 0.1µF in parallel with 1.0µF) be provided on the REGIN input.
Table 9.1. Voltage Regulator Electrical Specifications
VDD = 3.0 V; -40°C to +85°C unless otherwise specified
PARAMETER
CONDITIONS
Input Voltage Range
Output Voltage
MIN
TYP
4.0
Output Current = 1 to 100 mA
VBUS Detection Input Threshold
Bias Current
© 2003 Cygnal Integrated Products, Inc. DS014-1.0 AUG03
MAX UNITS
5.25
V
3.0
3.3
3.6
V
1.0
1.8
4.0
V
90
TBD
µA
Page 13
CP2101
Preliminary
Disclaimers:
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
Page 14
DS014-1.0 AUG03 © 2003 Cygnal Integrated Products, Inc.
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