Flash Mcu
2009
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 Atmel AT89STK 05 USB Flash MCU Starter Kit $20.00 Time Remaining: 22h 48m Buy It Now for only: $65.00 |
 PIC16F874A I P IC 8 BIT FLASH MCU $6.00 Time Remaining: 1d 16h 39m Buy It Now for only: $7.00 |
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Flash Mcu
Windows Digitizer Class Driver For Touch Screens
The CP2501 device is a touch screen USB bridge that can be used to connect the touch screen controller with the host CPU. The CP2501 incorporates a high‐performance MCU with a 48 MIPS 8051‐compatible core, 53 kB of user‐programmable flash memory and 3.5 kB of RAM. Unlike other USB microcontroller devices in the market, the CP2501 features pre‐programmed USB touch interface firmware, which greatly simplifies USB touch screen product development. The Windows 7 touch interface compliant CP2501 device works seamlessly with the Windows digitizer class driver for touch screens and is supported by Silicon Labs' GUI‐based configuration wizard. This deployment tool enables developers to easily and quickly connect their touch controller to a USB system without having to develop customized USB firmware, thus reducing time to market as well as the level of expertise required for USB interface development.
The CP2501 device features a USB 2.0‐compliant, full‐speed USB controller with an integrated full‐speed transceiver and on‐chip matching and pull‐up resistors. The integrated USB controller manages all data transfers on the USB bus, as well as command requests generated by the USB host controller. The user firmware uses the interface provided by the system firmware to initialize and communicate using the USB protocol. The CP2501 device also includes a USB bootloader to easily update user firmware. User code is required to enable the interface API to initialize the USB interface and send touch data to the host PC.
The CP2501 device supports three different serial interfaces for communicating with various touch screen controllers. The interface choice can be selected through the CP250x configuration wizard. The CP2501 device's UART interface consists of the UART_TX (transmit) and UART_RX (receive) data signals and is programmable to support a wide range of data formats and baud rates. The SPI protocol provides access to a flexible, full‐duplex synchronous serial bus. SPI operates as a master device in 4‐wire mode. The optional slave‐select signal can be left floating when connecting to a 3‐wire SPI device. Additional GPIO pins can be used to select multiple slave devices in master mode. The CP2501 device's SPI interface consists of the SPI_SCLK (clock), SPI_MOSI (master out), SPI_MISO (master in) and SPI_NSS (slave select) signals and is programmable to support a wide range of clock speeds and configurations.
About the Author
Silicon Labs - 8051 Microcontroller and Optical Sensor IC. An industry leader in the innovation of high-performance, analog-intensive, mixed-signal ICs. Mixed-signal ICs enable the analog world we live in to interact with the digital world of computing in customer products.
Difference between lux and lumens?
Hey everyone.
I've been wanting to purchase a flash light. I'm a bit confused though.
So far all the flash lights I have taken a look at measure their brightness in lumens, like this one for example: http://www.dealextreme.com/p/ultrafire-u4-mcu-cree-q5-wc-3-mode-230-lumen-led-versatile-flashlight-cr123a-18650-18500-aaa-17401
And this other flash light I found has a different measurement. I don't understand it.
http://www.dealtoworld.com/reviews-12479-50767-Bright+flushlight.html
The output is 85 lumen...? This flash light is a lot better than the first one, so I'm a bit confused.
Could someone please explain me how this stuff works?
Also, if you have any idea how much lumens the second flash light might be, please let me know.
Thanks everyone.
From Wikipedia
Lux versus lumen
The difference between the lux and the lumen is that the lux takes into account the area over which the luminous flux is spread. A flux of 1,000 lumens, concentrated into an area of one square metre, lights up that square metre with an illuminance of 1,000 lux. However, the same 1,000 lumens, spread out over ten square metres, produces a dimmer illuminance of only 100 lux.
Achieving an illuminance of 500 lux might be possible in a home kitchen with a single fluorescent light fixture with an output of 12,000 lumens. To light a factory floor with dozens of times the area of the kitchen would require dozens of such fixtures. Thus, lighting a larger area to the same level of lux requires a greater number of lumens
Atmel @ ESC Silicon Valley 2011 -Touch Solutions ARM Cortex M3
