CP2102/9
S
INGLE
-C
HIP
USB-
TO
-UART B
RIDGE
For newer designs, the CP2102N devices offer compatible footprints and are recommended for use instead
of the CP2102/9. See the Silicon Labs website (www.silabs.com/usbxpress) for more information.
Single-Chip USB to UART Data Transfer
-
Integrated USB transceiver; no external resistors
-
Integrated clock; no external crystal required
-
Internal 1024-byte programmable ROM for vendor ID,
required
product ID, serial number, power descriptor, release
number, and product description strings
- EEPROM (CP2102)
- EPROM (One-time programmable) (CP2109)
-
On-chip power-on reset circuit
-
On-chip voltage regulator
- 3.3 V output (CP2102)
- 3.45 V output (CP2109)
-
100% pin and software compatible with CP2101
Virtual COM Port Device Drivers
-
Works with existing COM port PC Applications
-
Royalty-free distribution license
-
Windows 8/7/Vista/Server 2003/XP/2000
-
Mac OS-X/OS-9
-
Linux
USBXpress™ Direct Driver Support
-
Royalty-Free Distribution License
-
Windows 7/Vista/XP/Server 2003/2000
-
Windows CE
Example Applications
-
Upgrade of RS-232 legacy devices to USB
-
Cellular phone USB interface cable
-
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
-
RoHS-compliant 28-pin QFN (5x5 mm)
Ordering Part Numbers
-
CP2102-GM
-
CP2109-A01-GM
Temperature Range: –40 to +85 °C
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: 5, 6, 7, and 8
- Stop bits: 1, 1.5, and 2
- Parity: odd, even, mark, space, no parity
Baud rates: 300 bps to 1 Mbps
576 Byte receive buffer; 640 byte transmit buffer
Hardware or X-On/X-Off handshaking supported
Event character support
Line break transmission
7
REGIN
IN
Voltage
Regulator
OUT
CP2102/9
RST
SUSPEND
VDD
9
12
11
6
VDD
GND
3.3 – 3.45 V
SUSPEND
(to external
circuitry for
USB
suspend
states)
3
RI
2
1
28
27
26
25
24
23
USB
CONNECTOR
VBUS
D-
D+
GND
6
5
1
2
3
8
VBUS
48 MHz
Oscillator
DCD
DTR
DSR
TXD
RXD
RTS
CTS
5
4
D-
D+
4
USB
Transceiver
USB Function
Controller
1024B
PROM
UART
External
RS-232
transceiver
or UART
circuitry
D1 D2 D3
18
640B 576B
TX
RX
Buffer Buffer
VPP
*CP2109 only
Figure 1. Example System Diagram
Rev. 1.8 1/17
Copyright © 2017 by Silicon Laboratories
CP2102/9
CP2102/9
T
ABLE OF
C
ONTENTS
Section
Page
1. System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2. Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
3. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
4. Pinout and Package Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5. QFN-28 Package Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6. USB Function Controller and Transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7. Asynchronous Serial Data Bus (UART) Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
8. Internal Programmable ROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
9. CP2102/9 Device Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9.1. Virtual COM Port Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9.2. USBXpress Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9.3. Driver Customization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
9.4. Driver Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
10. Voltage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
11. Porting Considerations from CP2102 to CP2109 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
11.1. Pin-Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
11.2. Distinguishing Factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
11.3. Differences in Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
12. Relevant Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Rev. 1.8
3
CP2102/9
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 EPROM, 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 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 programmable ROM 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 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 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 CP2102/9. Direct access driver support is available through the 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 VCP 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.
4
Rev. 1.8
CP2102/9
2. Ordering Information
Table 1. Product Selection Guide
Ordering Part
Number
Internal
EEPROM EPROM
Programmable
ROM (Byte)
1024
1024
Y
N
N
Y
Calibrated
Internal
48 MHz
Oscillator
Y
Y
Supply
Voltage
Regulator
Y
Y
Lead-free
(RoHS-
Compliant)
Y
Y
Package
CP2102-GM*
CP2109-A01-GM*
QFN28
QFN28
*Note:
Pin compatible with the CP2101-GM.
Rev. 1.8
5
stm32/stm8
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