Adafruit LTC4311 I2C Extender / Active Terminator

Adafruit LTC4311 I2C Extender / Active Terminator .I2C stands for Inter-Integrated-Circuit communications, it's meant for short distances on a PCB or subassembly. But, hey, we're engineers, and we like to push the limits of technology, right? So 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 could try slowing down your I2C clock to 1 KHz...or you could use an Adafruit LTC4311 active terminator like this one! Using this board is easy: connect it to your I2C bus at the beginning 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.

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 sawtooth into square waves. To get you going fast, we spun up a custom made PCB in the STEMMA QT form factor, making it easy to interface with. The STEMMA QT connectors on either side are compatible with the SparkFun Qwiic I2C connectors. This allows you to make solderless connections between your development board and the Adafruit LTC4311 I2C Extender / Active Terminator  or to chain it with a wide range of other sensors and accessories using a compatible cable

1. Supports voltage from 1.6V to 5.5V
2. Works at up to 400KHz speed
3. Auto-detects low-power standby mode
4. Prevents bus loading when powered down
5. Uses the STEMMA QT form factor for easy integration
6. Compatible with SparkFun Qwiic I2C connectors
7. Does not require special software or configuration

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