{"product_id":"adafruit-ltc4311-i2c-extender-active-terminator-stemma-qt-qwiic","title":"Adafruit LTC4311 I2C Extender \/ Active Terminator","description":"\u003cp\u003eI2C stands for Inter-Integrated-Circuit communications, its meant for short distances on a PCB or subassembly. But, hey, we're engineers and we like to push the limits of technology, right?\u003c\/p\u003e\n\u003cp\u003eSo why not try to have I2C run over a meter long cable, or even longer? Well, if you try to do that you'll quickly find that the length of the cable adds capacitance and resistance that slows down the open-drain pullups used in I2C, making it hard to use 100KHz+ clock speeds. You \u003cem\u003ecould\u003c\/em\u003e try slowing down your I2C clock to 1 KHz...or you could use an \u003cstrong\u003eAdafruit LTC4311 active terminator\u003c\/strong\u003e like this one!\u003c\/p\u003e\n\u003cp\u003eUsing this board is easy: connect it to your I2C bus at the beginning of the chain (if you don't have a massively long cable, you can also try at the end of the chain). When the chip is powered and enabled, it will watch the SCL and SDA lines. When it sees them being pulled up through the I2C resistors, it will activate and dump in some current to give it a boost thru to the top power rail.\u003c\/p\u003e\n\u003cp\u003eYou can now achieve much faster data rates without having to noodle with resistors, and over long cables. Adafruit ran a 400 KHz OLED over 3 meters of phone wire with ease. With a 100KHz signal, they even ran a BME680 over 100 feet of Ethernet (\u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Category_5_cable\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eabout 3000pF round trip!\u003c\/a\u003e), and had an OLED display the sensor details.\u003c\/p\u003e\n\u003cp\u003eRuns with any bus voltage, from 1.6V to 5.5V and up to 400 KHz SCL speed, with cables up to 4000pF. No special firmware, software, or configuration required. Simply plug the power, ground, SCL and SDA connectors into your bus and watch as your rise times magically turn sawtooths into square waves.\u003c\/p\u003e\n\u003cp\u003eTo get you going fast, Adafruit spun up a custom made PCB in the \u003ca href=\"\/en-eu\/collections\/stemma-qt\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eSTEMMA QT form factor\u003c\/a\u003e, making it easy to interface with. The \u003ca href=\"https:\/\/learn.adafruit.com\/introducing-adafruit-stemma-qt\/what-is-stemma-qt\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eSTEMMA QT connectors\u003c\/a\u003e on either side are compatible with the \u003ca href=\"https:\/\/www.sparkfun.com\/qwiic\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eSparkFun Qwiic I2C connectors\u003c\/a\u003e. This allows you to make solderless connections between your development board and the LTC4311 or to chain it with a wide range of other sensors and accessories using a \u003ca href=\"\/en-eu\/products\/jst-sh-cable-qwiic-stemma-qt-compatible\" target=\"_blank\" rel=\"noopener noreferrer\"\u003ecompatible cable\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eTECHNICAL DETAILS\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eLTC4311 Features \u0026amp; Specifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eImproves I2C Bus Rise Time Transition\u003c\/li\u003e\n\u003cli\u003eEnsures Data Integrity with Multiple Devices on the I2C Bus.\u003c\/li\u003e\n\u003cli\u003eWide Supply Voltage Range: 1.6V to 5.5V\u003c\/li\u003e\n\u003cli\u003eImproves Low State Noise Margin\u003c\/li\u003e\n\u003cli\u003eUp to 400kHz Operation\u003c\/li\u003e\n\u003cli\u003eAuto Detect Low Power Standby Mode\u003c\/li\u003e\n\u003cli\u003eLow (\u0026lt;5μA) Supply Current Shutdown\u003c\/li\u003e\n\u003cli\u003eDoes Not Load Bus When Disabled or Powered Down\u003c\/li\u003e\n\u003cli\u003eStrong Slew Limited Pull-up Current\u003c\/li\u003e\n\u003cli\u003e±8kV Human Body Model ESD Ruggedness\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Adafruit","offers":[{"title":"Default Title","offer_id":32236662587475,"sku":"ADA4756","price":7.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/products\/4756-06.jpg?v=1600864437","url":"https:\/\/shop.pimoroni.com\/en-eu\/products\/adafruit-ltc4311-i2c-extender-active-terminator-stemma-qt-qwiic","provider":"Pimoroni Ltd","version":"1.0","type":"link"}