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
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
USBXpress™ Direct Driver Support
-
Royalty-Free Distribution License
-
Windows Vista/XP/Server 2003/2000
-
Windows CE 6.0, 5.0, and 4.2
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 rec-
ommended for new designs. The CP2102 is a pin and
software compatible alternative for the CP2101. The
CP2102 is recommended for all new designs.
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
•
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
7
REGIN
IN
Voltage
Regulator
OUT
CP2101
RST
SUSPEND
9
12
11
VDD
6
VDD
GND
3.3 V
(to external circuitry
for USB suspend
states)
SUSPEND
3
RI
2
1
28
27
26
25
24
23
8
USB
CONNECTOR
VBUS
D–
D+
GND
6
5
1
2
3
VBUS
48 MHz
Oscillator
DCD
DTR
DSR
TXD
RXD
RTS
CTS
External RS-232
transceiver or
UART circuitry
5
4
D–
D+
4
USB
Transceiver
USB Function
Controller
512B
EEPROM
512B 512B
TX
RX
Buffer Buffer
UART
D1 D2 D3
Example System Diagram
Rev. 1.8 5/07
Copyright © 2007 by Silicon Laboratories
CP2101
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
N
OTES:
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 applica-
tions. The EEPROM is programmed on-board via the USB allowing the programming step to be easily inte-
grated into the product manufacturing and testing process.
Royalty-free Virtual COM Port (VCP) device drivers provided by Silicon Laboratories allow a CP2101-
based 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 soft-
ware 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
Ambient temperature under bias
Storage Temperature
Voltage on any I/O Pin or RST with respect to
GND
Voltage on V
DD
with respect to GND
Maximum Total current through V
DD
and GND
Maximum output current sunk by RST or any
I/O pin
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
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
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