CP2101 Single-Chip USB to UART Bridge

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: 3.3 V Output
USBXpress™ Direct Driver Support
- Royalty-Free Distribution License
- Windows Vista/XP/Server 2003/2000
- Windows CE 6.0, 5.0, and 4.2
USB Function Controller
- USB Specification 2.0 Compliant; Full Speed
-
Virtual COM Port Device Drivers
- Works with Existing COM Port PC Applications
- Royalty-Free Distribution License
- Windows Vista/XP/Server 2003/2000/98SE
- Mac OS-X/OS-9
- Linux 2.40
(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
• Parity: Odd, Even, No Parity
- Baud Rates: 300 bps to 921.6 kbps
- 512 Byte Receive Buffer; 512 Byte Transmit Buffer
- Hardware or X-On / X-Off Handshaking Supported
- Event Character 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: 3.0 to 3.6 V
- USB Bus Powered: 4.0 to 5.25 V
Package
- Pb-free 28-pin QFN (5 x 5 mm)
Ordering Part Number
- CP2101-GM
Temperature Range: -40 to +85 °C
Note: The CP2101 is a mature product and is not recommended for new designs. The CP2102 is a pin and
software compatible alternative for the CP2101. The
CP2102 is recommended for all new designs.
7
REGIN
CP2101
Voltage
IN
Regulator
VDD
RST
OUT
SUSPEND
6
3
8
USB
CONNECTOR
VBUS
D–
D+
GND
3.3 V
VDD
SUSPEND
GND
RI
48 MHz
Oscillator
VBUS
DCD
DTR
1
5
2
3
4
4
5
6
D1 D2 D3
D–
D+
USB
Transceiver
USB Function
Controller
UART
512B 512B
512B
TX
RX
EEPROM
Buffer Buffer
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
Example System Diagram
Rev. 1.8 5/07
Copyright © 2007 by Silicon Laboratories
CP2101
CP2101
2
Rev. 1.8
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
Table 3.2. UART and Suspend I/O DC Electrical Characteristics ........................ 6
Table 3.3. Reset Electrical Characteristics .......................................................... 6
4. Pinout and Package Definitions............................................................................. 7
Table 4.1. Pin Definitions for the CP2101 ............................................................ 7
Figure 4.1. QFN-28 Pinout Diagram (Top View) .................................................. 8
Figure 4.2. QFN-28 Package Drawing ................................................................. 9
Table 4.2. QFN-28 Package Dimensions............................................................. 9
Figure 4.3. Typical QFN-28 Landing Diagram ................................................... 10
Figure 4.4. Typical QFN-28 Solder Paste Recommendation ............................. 11
5. USB Function Controller and Transceiver .......................................................... 12
Figure 5.1. Typical Connection Diagram ............................................................ 12
6. Asynchronous Serial Data Bus (UART) Interface............................................... 12
Table 6.1. Data Formats and Baud Rates.......................................................... 13
7. Internal EEPROM ................................................................................................... 13
Table 7.1. Default USB Configuration Data ....................................................... 13
8. CP2101 Device Drivers.......................................................................................... 14
8.1. Virtual COM Port Drivers .................................................................................. 14
8.2. USBXpress Drivers ........................................................................................... 14
8.3. Driver Customization ........................................................................................ 14
8.4. Driver Certification ............................................................................................ 14
9. Voltage Regulator.................................................................................................. 15
Table 9.1. Voltage Regulator Electrical Specifications ....................................... 15
Figure 9.1. Configuration 1: USB Bus-Powered ................................................. 15
Figure 9.2. Configuration 2: USB Self-Powered ................................................. 16
Figure 9.3. Configuration 3: USB Self-Powered, Regulator Bypassed .............. 16
10. Relevant Application Notes .................................................................................. 17
Document Change List ............................................................................................... 18
Contact Information .................................................................................................... 20
Rev. 1.8
3
CP2101
NOTES:
4
Rev. 1.8
CP2101
1.
System Overview
The CP2101 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 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 5 x 5 mm QFN-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 Silicon Laboratories allow a CP2101based product to appear as a COM port to PC applications. The CP2101 UART interface implements all
RS-232 signals, including control and handshaking signals, so existing system firmware 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 CP2101. Direct access driver support is available
through the Silicon Laboratories USBXpress driver set.
The CP2101 is a mature product and is not recommended for new designs. The CP2102 is a pin and software compatible alternative for the CP2101. The CP2102 is recommended for all new designs. Contact
Silicon Laboratories customer support at www.silabs.com for any questions about replacing the CP2101.
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.
Rev. 1.8
5
CP2101
3.
Global DC Electrical Characteristics
Table 3.1. Global DC Electrical Characteristics
VDD = 3.0 to 3.6 V, –40 to +85 °C unless otherwise specified.
Parameter
Conditions
Supply Voltage
Min
Typ
Max
Units
3.0
3.3
3.6
V
Supply Current1
Normal Operation;
VREG Enable
—
22
26
mA
Supply Current1
Suspended;
VREG Enable
—
78
200
µA
—
200
228
µA
–40
—
+85
°C
Supply Current - USB Pull-up2
Specified Operating Temperature Range
Notes:
1. USB Pull-up Current should be added for total supply current.
2. The USB Pull-up supply current values are calculated values based on USB specifications.
Table 3.2. UART and Suspend I/O DC Electrical Characteristics
VDD = 3.0 to 3.6 V, -40 to +85 °C unless otherwise specified.
Parameters
Conditions
Min
Typ
Max
Units
Output High Voltage
IOH = –3 mA
IOH = –10 µA
IOH = –10 mA
VDD – 0.7
VDD – 0.1
—
—
—
VDD – 0.8
—
—
—
V
Output Low Voltage
IOL = 8.5 mA
IOL = 10 µA
IOL = 25 mA
—
—
—
—
—
1.0
0.6
0.1
—
V
Input High Voltage
2.0
—
—
V
Input Low Voltage
—
—
0.8
V
Input Leakage Current
—
25
50
µA
Table 3.3. Reset Electrical Characteristics
-40°C to +85°C unless otherwise specified.
Parameter
Conditions
Min
Typ
Max
Units
IOL = 8.5 mA,
VDD = 3.0 V to 3.6 V
—
—
0.6
V
/RST Input High Voltage
0.7 x VDD
—
—
V
/RST Input Low Voltage
—
—
0.3 x VDD
—
25
40
µA
15
—
—
µs
/RST Output Low Voltage
/RST Input Pull-Up Current
/RST = 0.0 V
Minimum /RST Low Time to
Generate a System Reset
6
Rev. 1.8
CP2101
4.
Pinout and Package Definitions
Table 4.1. Pin Definitions for the CP2101
Name
Pin #
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 input (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)
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
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)
These pins should be left unconnected or tied to VDD.
*Note: Pins can be left unconnected when not used.
Rev. 1.8
7
DTR
DSR
TXD
RXD
RTS
CTS
NC
27
26
25
24
23
22
GND
28
CP2101
DCD
1
21
NC
RI
2
20
NC
GND
3
19
NC
D+
4
18
NC
D-
5
17
NC
VDD
6
16
NC
15
NC
CP2101
Top View
GND
12
13
14
SUSPEND
NC
NC
10
NC
11
9
RST
SUSPEND
8
7
VBUS
REGIN
Figure 4.1. QFN-28 Pinout Diagram (Top View)
8
Rev. 1.8
CP2101
Figure 4.2. QFN-28 Package Drawing
Table 4.2. QFN-28 Package Dimensions
Dimension
Min
Nom
Max
Dimension
Min
Nom
Max
A
A1
A3
0.80
0.03
0.90
0.07
0.25 REF
1.00
0.11
E2
L
aaa
2.90
0.45
3.15
0.55
0.15
3.35
0.65
b
D
0.18
0.25
5.00 BSC.
0.30
bbb
ddd
0.10
0.05
D2
e
2.90
3.15
0.50 BSC.
3.35
eee
Z
0.08
0.435
Y
0.18
E
5.00 BSC.
Notes:
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 JEDEC outline MO-243, variation VHHD except for custom features D2, E2, L, Z, and
Y which are toleranced per supplier designation.
4. Recommended card reflow profile is per the JEDEC/IPC J-STD-020C specification for Small Body
Components.
Rev. 1.8
9
CP2101
Figure 4.3. Typical QFN-28 Landing Diagram
10
Rev. 1.8
CP2101
Figure 4.4. Typical QFN-28 Solder Paste Recommendation
Rev. 1.8
11
CP2101
5.
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.
Both SUSPEND and SUSPEND temporarily float high during a CP2101 reset. If this behavior is undesirable, a strong pulldown (10 kΩ) can be used to ensure SUSPEND remains low during reset. See
Figure 5.1 for other recommended options.
VDD
CP2101
7
R1
4.7 kΩ
RST
SUSPEND
6
C4
4.7 µF
C2
0.1 µF
3
VDD
SUSPEND
GND
RI
Option 2
8
USB
CONNECTOR
VBUS
DD+
GND
DCD
VBUS
DTR
DSR
1
2
5
3
4
4
5
6
D1
D2
D-
TXD
D+
RXD
RTS
D3
Option 3
Option
Option
Option
Option
Option
1:
2:
3:
3:
4:
Option 1
REGIN
C1
1 µF
CTS
9
(to external circuitry
for USB suspend
states)
12
11
R2
10 kΩ
2
1
28
27
Option 4
External RS-232
transceiver or
UART circuitry
26
25
24
23
A 4.7 kΩ pull-up resistor can be added to increase noise immunity.
A 4.7 µF capacitor can be added if powering other devices from the on-chip regulator.
Avalanche transient voltage suppression diodes can be added for ESD protection .
Use Littlefuse p/n SP0503BAHT or equivalent.
10 kΩ resistor to ground to hold SUSPEND low on initial power on or device reset.
Figure 5.1. Typical Connection Diagram
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/XOff handshaking.
12
Rev. 1.8
CP2101
The UART is programmable to support a variety of data formats and baud rates. If the Virtual COM Port
drivers are used, the data format and baud rate are set during COM port configuration on the PC. If the
USBXpress drivers are used, the CP2101 is configured through the USBXpress API. The data formats
and baud rates available are listed in Table 6.1.
Table 6.1. Data Formats and Baud Rates
7.
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
Internal EEPROM
The CP2101 includes an internal EEPROM that may be used to customize the USB Vendor ID (VID), Product ID (PID), Product Description String, Power Descriptor, Device Release Number and Device Serial
Number as desired for OEM applications. If the EEPROM is not programmed with OEM data, the default
configuration data shown in Table 7.1 is used.
While customization of the USB configuration data is optional, it is recommended to customize the VID/PID
combination. A unique VID/PID combination will prevent the driver from conflicting with any other USB
driver. A vendor ID can be obtained from www.usb.org or Silicon Laboratories can provide a free PID for
the OEM product that can be used with the Silicon Laboratories VID. It is also recommended to customize
the serial number if the OEM application is one 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 Silicon Laboratories. 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) 32h
Release Number
0100h
Serial Number
0001 (63 characters maximum)
Product Description String
“CP2101 USB to UART Bridge Controller” (126 characters maximum)
Rev. 1.8
13
CP2101
8.
CP2101 Device Drivers
There are two sets of device drivers available for the CP2101 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/products/microcontroller/downloads.asp.
8.1.
Virtual COM Port Drivers
The CP2101 Virtual COM Port (VCP) device drivers allow a CP2101-based device to appear to the PC's
application software as a COM port. 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 interface. Therefore, existing COM port applications
may be used to transfer data via the USB to the CP2101-based device without modifying the application.
See Application Note AN197: Code for Example Code for Interfacing to a CP2102 using the Virtual COM
drivers.
8.2.
USBXpress Drivers
The Silicon Laboratories USBXpress drivers provide an alternate solution for interfacing with CP2102
devices. No Serial Port protocol expertise is required. Instead, a simple, high-level application program
interface (API) is used to provide simpler CP201x connectivity and functionality. 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 form of a Windows Dynamic Link
Library (DLL). The USBXpress driver set is recommended for new products that also include new PC software. The USBXpress interface is described in Application Note “AN169: USBXpress Programmer's
Guide.”
8.3.
Driver Customization
In addition to customizing the device as described in Section 7. "Internal EEPROM" on page 13, the drivers and the drivers installation package can be also be customized. See Application Note “AN220: USB
Driver Customization” for more information on generating customized VCP and USBXpress drivers.
8.4.
Driver Certification
The default drivers that are shipped with the CP2101 are Microsoft WHQL (Windows Hardware Quality
Labs) certified. The certification means that the drivers have been tested by Microsoft and their latest
operating systems (XP and Vista) will allow the drivers to be installed without any warnings or errors.
The customized drivers that are generated using the AN220 software are not automatically certified. They
must go first through the Microsoft Driver Reseller Submission process. Contact Silicon Laboratories support for assistance with this process.
14
Rev. 1.8
CP2101
9.
Voltage Regulator
The CP2101 includes an on-chip 5-to-3 V voltage regulator. This allows the CP2101 to be configured as
either a USB bus-powered device or a USB self-powered device. These configurations are shown in
Figure 9.1 and Figure 9.2. When enabled, the 3 V voltage regulator output appears on the VDD pin and can
be used to power external 3V devices. See Table 9.1 for the voltage regulator electrical characteristics.
Alternatively, if 3 V power is supplied to the VDD pin, the CP2101 can function as a USB self-powered
device with the voltage regulator disabled. For this configuration, it is recommended that the REGIN input
be tied to the 3 V net to disable the voltage regulator. This configuration is shown in Figure 9.3.
The USB max power and power attributes descriptor must match the device power usage and configuration. See application note “AN144: CP2101 Customization Guide” for information on how to customize USB
descriptors for the CP2101.
Note: It is recommended that additional decoupling capacitance (e.g., 0.1 µF in parallel with 1.0 µF) be pro-
vided on the REGIN input.
Table 9.1. Voltage Regulator Electrical Specifications
–40 to +85 °C unless otherwise specified.
Parameter
Conditions
Min
Typ
Max
Units
4.0
—
5.25
V
3.0
3.3
3.6
V
VBUS Detection Input Threshold
1.0
1.8
4.0
V
Bias Current
—
90
TBD
µA
Input Voltage Range
Output Current = 1 to 100 mA*
Output Voltage
*Note: The maximum regulator supply current is 100 mA.
CP2101
VBUS
VBUS Sense
From VBUS
REGIN
5 V In
Voltage Regulator (REG0)
3 V Out
To 3 V
Power Net
VDD
Device
Power Net
Figure 9.1. Configuration 1: USB Bus-Powered
Rev. 1.8
15
CP2101
CP2101
From VBUS
VBUS
VBUS Sense
From 5 V
Power Net
REGIN
5 V In
Voltage Regulator (REG0)
3 V Out
To 3V
Power Net
VDD
Device
Power Net
Figure 9.2. Configuration 2: USB Self-Powered
CP2101
From VBUS
VBUS
VBUS Sense
REGIN
5 V In
Voltage Regulator (REG0)
3 V Out
From 3 V
Power Net
VDD
Device
Power Net
Figure 9.3. Configuration 3: USB Self-Powered, Regulator Bypassed
16
Rev. 1.8
CP2101
10. Relevant Application Notes
The following Application Notes are applicable to the CP2101. The latest versions of these application
notes and their accompanying software are available at:
http://www.silabs.com/products/microcontroller/applications.asp.
AN144: CP210x Device Customization Guide. This application note describes how to use the AN144
software to configure the USB parameters on the CP2101 devices.
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 CP2101 and includes example code.
AN220: CP210x USB Driver Customization. This application note describes how to use the AN220 software to customize the VCP or USBXpress drivers with OEM information.
Rev. 1.8
17
CP2101
DOCUMENT CHANGE LIST
Revision 1.6 to Revision 1.7
„
„
Updated “Linux 2.40” bullet on page 1.
Changed MLP to QFN throughout.
Revision 1.7 to Revision 1.71
„
Removed “Windows CE” bullet from page 1.
Revision 1.71 to Revision 1.8
„
„
„
„
„
„
„
„
„
18
Added note on pages 1 and 4 regarding CP2101 not recommend for new designs.
Added additional supported operating systems on page 1.
Changed VDD conditions of Tables 3.1 and 3.2 from a minimum of 2.7 to 3.0 V.
Added values to Table 3.1, “Global DC Electrical Characteristics,” on page 6.
Updated package drawings in Figure 4.2, Figure 4.3, and Figure 4.4.
Changed Figure 4.4 title.
Removed tantalum requirement in Figure 5.1.
Updated Section 8. "CP2101 Device Drivers" on page 14 with USBXpress, customization, and
certification information.
Added Section 10. "Relevant Application Notes" on page 17.
Rev. 1.8
CP2101
NOTES:
Rev. 1.8
19
CP2101
CONTACT INFORMATION
Silicon Laboratories Inc.
400 West Cesar Chavez
Austin, TX 78701
Tel: 1+(512) 416-8500
Fax: 1+(512) 416-9669
Toll Free: 1+(877) 444-3032
Email: [email protected]
Internet: www.silabs.com
The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without
notice. Silicon Laboratories assumes 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
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20
Rev. 1.8
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