CP2501EK Silicon Laboratories Inc, CP2501EK Datasheet - Page 4

• Manufacturer Part Number: CP2501EK
• Description: KIT EVALUATION CP2501
• Manufacturer: Silicon Laboratories Inc

Specifications of CP2501EK

• Main Purpose: Interface, Touch Screen Controller
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: CP2501
• Primary Attributes: Evaluation Board with Glass Sensor (Laminated Glass Lens)
• Secondary Attributes: SPI, SMBus, or UART Interface
• Interface Type: USB, I2C, SPI, UART
• Operating Voltage: 3.3 V
• Data Bus Width: 16 bit
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• For Use With/related Products: CP2501, C8051F700
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 336-1989

CP2501-EK
6. Operating System Support
The CP2501 enumerates as a standard HID class USB device and does not require custom drivers. The different
versions of Windows have different levels of support for the standard touch-screen class. The level of support for
the default installation of the operating system is shown below in Table 1. Extra touch-screen support is available
for some versions through Windows service packs and other upgrades.
When a touch-screen device is connected to a Windows 7 PC, the CP2501 reports to the USB host the number of
touch points and the number of pen inputs that it supports. In the case of the evaluation board firmware, it reports
support for two touch points and zero pen inputs. The Windows 7 USB host then responds with the number of
points it is willing to support. Until this negotiation is complete, the CP2501 operates in Mouse mode and touch
data from the screen is sent as absolute mouse positions. The GPIO2 and GPIO3 mechanical switches operates
as the left-mouse button and right-mouse button respectively.
When a CP2501 device is connected to Windows Vista or Windows XP, the same negotiation is not performed.
When connecting to these operating systems, the system designer must configure the CP2501 firmware to use a
specific mode of operation—mouse mode or single-point touch mode. The default firmware loaded on the CP2501
is configured for mouse mode operation. This means that even when connected to a Windows Vista system that
supports touch screens, the default CP2501 evaluation board operates as an absolute-position HID mouse.
A CP2501 firmware image that defaults to single-point touch mode is included on the evaluation kit CD. This
firmware image is bootloadable over USB to the CP2501 using the CP2501 Bootloader PC application. See
Section 7 for more information about using this application. Bootloading the new image allows the CP2501
evaluation board to operate as a single-point touch device under Windows Vista.
4
Windows 7—Home Premium, Professional, Ultimate, Enterprise
Windows 7—Starter
Windows Vista—Home Premium, Business, Ultimate
Windows Vista—Home Basic
Windows XP Tablet PC Edition
Windows XP
Windows 2000/98/ME
Operating System
Table 1: Windows Touch-Screen Support
Rev. 0.1
Supported
No native support
Supported
No native support
Supported
No native support
No native support
Default Touch Screen Support