Silabs 公司的CP2501是單片USB HID觸摸屏橋，通過USB接口把觸摸屏控制器和主機連接起來，可工作在多種觸摸屏檢測技術，包括電阻和電容觸摸屏。主要應用在電子書閱讀器，POS，筆記本電腦，平板電腦和游戲機。本文介紹了CP2501主要特性，CP2501方框圖和CP250X 開發(fā)板套件主要特性以及開發(fā)板套件中主板和子板電路圖。
CP2501 Single-Chip USB HID Touch-Screen Bridge
The CP2501 USB touch screen bridge connects the touch screen controller with the host through a USB interface. The bridge works with various touch screen sensing technologies, including resistive and capacitive touch. Designers can connect a touch controller using an I2C, UART or SPI interface to a PC system through USB.
CP2501主要特性：
Programmable Touch-Screen Interface
- Adds Windows-compatible USB HID touchscreen interface to touch-screen modules
- Supports multiple touch points and pen inputs
- Supports basic mouse functions
- Includes a programmable 8051-based controller that is pre-programmed with USB interface
- Supports most common touch-screen module ? interfaces: UART, SPI and I2C. UART Interface
- Data Bits: 5, 6, 7, and 8
- Stop Bits: 1, 1.5, and 2
- Parity: Odd, Even, Mark, Space, and None
- Baud Rates: 9600 bps to 500 kbps SPI Master Interface
- 4-wire SPI Master with Chip Select
- Configurable Clock Polarity and Phase
- Clock speeds up to 4 MHz SMBus / I2C Master Interface
- Operates at configurable clock rates up to 400 kHz
- Supports configurable slave address GPIO Capability
- CP2501 supports 16 GPIO pins
- Configurable as inputs, open-drain outputs or push-pull outputs High-Speed 8051 μC Core
- 48 MHz or 24 MHz system clock
- Pipelined instruction architecture; executes 70% of instructions in 1 or 2 system clocks User Memory Space
- 53 kB Flash
- 3.5 kB RAM USB Peripheral Function Controller
- HID Touch Screen class device
- USB Specification 2.0 compliant (full-speed)
- Built-in oscillator - Configurable USB parameters such as VID, PID, and strings
- Supports remote wakeup Programming Options
- Obtain pre-programmed parts from the factory
- Program memory in-system
- Program over USB using bootloader Supply Voltage 3.0 to 3.6 V
- Built-in voltage supply monitor
- Built-in 3 V regulator Ordering Information
- CP2501-B01-GM (QFN-32, 5x5 mm)Temperature Range: –40 to +85 ℃
CP2501應用：
Notebook computers
Kiosks
Tablets
Point of Sale devices
E-book readers
圖1。CP2501方框圖
CP250X 開發(fā)板套件
The CP2501 Development Kit includes a motherboard that interfaces to a daughter board. The CP2501 Development Daughter Board contains a CP2501 device to be used for preliminary software development.
Numerous input/output (I/O) connections are provided on the motherboard to facilitate prototyping. Figure 3 shows the CP250x Motherboard and indicates locations for various I/O connectors and shows the factory default shorting block positions. Figure 4 shows the available CP250x daughter board.
CP250X 開發(fā)板套件包括：
The CP250x Development Kit contains the following items:
CP250x Motherboard
CP2501 Development Daughter Board
CP250x Development Kit Quick-Start Guide
Product information CD-ROM including the following:
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Silicon Laboratories Integrated Development Environment (IDE)
SDCC Development Tools
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Raisonance Development Tools (evaluation version)
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Keil 8051 Development tools (evaluation version)
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CP250x Configuration Wizard and Bootloader
Source code examples
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Documentation
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AC-to-DC universal power adapter
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Two USB cables
圖2。CP250X 開發(fā)板套件外形圖
圖3。CP250X 開發(fā)板主板電路圖（1）
圖4。CP250X 開發(fā)板主板電路圖（2）
圖5。CP250X 開發(fā)板子板電路圖
詳情請見：
http://www.silabs.com/pages/DownloadDoc.aspx?FILEURL=Support
和
http://www.silabs.com/Support%20Documents/TechnicalDocs/CP2501-DK.pdf
