好用的usb转串口，cp2102_怎么判断波特率

usb转串口

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CP2102

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 1024-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

- 100% pin and software compatible with CP2101

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 Mbits

- 576 Byte receive buffer; 640 byte transmit buffer

- Hardware or X-On/X-Off handshaking supported

- Event character support

- Line break transmission

Virtual COM Port Device Drivers

Works with Existing COM Port PC Applications

- Royalty-Free Distribution License

- Windows Vista/XP/Server 2003/2000

- Mac OS-X / OS-9

- Linux

USBXpress™ Direct Driver Support

Royalty-Free Distribution License

- Windows Vista/XP/Server 2003/2000

- Windows CE

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

Lead free 28-pin QFN (5 x 5 mm)

Ordering Part Number

CP2102-GM

Temperature Range: –40 to +85 °C

Figure 1. Example System Diagram

CP2102

3.3 V

Voltage

Regulator

48 MHz

Oscillator

OUT

SUSPEND

REGIN

GND

RST

D+

D-

UART

DCD

CTS

RTS

RXD

TXD

DSR

DTR

External RS-232

transceiver or

UART circuitry

(to external circuitry

for USB suspend

states)

VBUS

D-

D+

GND

USB

CONNECTOR

VDD

VBUS

USB Function

Controller

USB

Transceiver

640B

Buffer

576B

Buffer

1024B

EEPROM

VDD

D1 D2 D3

CP2102

Rev. 1.3 3

TABLE OF CONTENTS

Section Page

1. System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

2. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

3. Global DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

4. Pinout and Package Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

5. USB Function Controller and Transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

6. Asynchronous Serial Data Bus (UART) Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

7. Internal EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

8. CP2102 Device Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

8.1. Virtual COM Port Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

8.2. USBXpress Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

8.3. Driver Customization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

8.4. Driver Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

9. Voltage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

10. Relevant Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

CP2102

4 Rev. 1.3

1. System Overview

The CP2102 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 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 CP2102-based

product to appear as a COM port to PC applications. The CP2102 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. Direct access driver support is available through the Silicon Laboratories

USBXpress driver set.

An evaluation kit for the CP2102 (Part Number: CP2102EK) is available. It 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 representatives or go to www.silabs.com to order the CP2102

Evaluation Kit.

2. Absolute Maximum Ratings

Table 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 V

with respect to GND

–0.3 — 4.2 V

Maximum Total current through V

and GND

——500mA

Maximum output current sunk by RST

or any I/O pin

——100mA

Note: Stresses above those listed may cause permanent damage to the device. This is a stress rating only, and functional

operation of the devices at or exceeding the conditions in the operation listings of this specification is not implied.

Exposure to maximum rating conditions for extended periods may affect device reliability.

剩余17页未读，继续阅读

dragonno1

2014-02-12

我想找的是用CP2102把USB转UART的电路图，对我没啥用。

asdf123321

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