卖[RWG] 鍵盤 MPR121-Breakout-v12 接近 電容式 觸摸傳感器 控制器最好的价格

MPR121-Breakout-v12 接近 電容式 觸摸傳感器 控制器 鍵盤開發板 Description:This is a breakout board for Freescale's MPR121QR2. The MPR121 is a capacitive touch sensor controller driven by an I2C interface. The chip can control up to twelve individual electrodes, as well as a simulated thirteenth electrode. The MPR121 also features eight LED driving pins. When these pins are not configured as electrodes, they may be used to drive LEDs. There a four jumpers on the bottom of the board, all of which are set (closed) by default. An address jumper ties the ADD pin to ground, meaning the default I2C address of the chip will be 0x5A. If you need to change the address of the chip (by shorting ADD to a different pin), make sure you open the jumper first. Jumpers also connect SDA, SCL and the interrupt pin to 10k pull-up resistors. If you don't require the pull-up resistors you can open the jumpers by cutting the trace connecting them. There is no regulation on the board, so the voltage supplied should be between 2.5 and 3.6VDC. The VREG pin is connected through a 0.1uF capacitor to ground, which means, unless you modify the board, you can't operate the MPR121 in low-supply voltage mode (1.71-2.75VDC). 描述：這是一個為飛思卡爾的mpr121qr2突破板。是的mpr121電容式觸摸傳感器控制器通過一個I2C接口驅動。該芯片可控制多達十二個電極，以及一個模擬第十三電極。該mpr121還具有八個LED驅動銷。當這些引腳沒有配置為電極，它們可用於驅動發光二極管。 有一四名運動員在板的底部，所有這一切都是集（關閉）默認情況下。一種地址跳線關系添加引腳接地，意義上的芯片默認的I2C地址將0x5a。如果你需要改變芯片的地址（通過做空添加到一個不同的引腳），確保你打開跳線第一。跳線連接SCL和SDA，中斷引腳10K的上拉電阻。如果你不需要上拉電阻可以通過切割痕跡連接打開跳線。 板上有沒有規定，所以提供的電壓應為2.5和3.6vdc之間。該VREG引腳通過一個0.1uF電容器接地，這意味著連接，除非你修改板，你不可以在低電源電壓模式操作mpr121（1.71-2.75vdc）