{"product_id":"adafruit-iso1540-bidirectional-i2c-isolator-stemma-qt-qwiic","title":"Adafruit ISO1540 Bidirectional I2C Isolator","description":"\u003cp\u003eSometimes you'll find yourself with an I2C bus controller on one side, and an I2C bus device on the other and \u003ca href=\"https:\/\/www.youtube.com\/watch?v=1jOk8dk-qaU\" target=\"_blank\"\u003eyou gotta keep em (electrically) separated.\u003c\/a\u003e Maybe because one is Earth-grounded, maybe because you've got some funky power monitoring setup, maybe you want to reduce noise.\u003c\/p\u003e\n\u003cp\u003eWhatever it is, you can use the Adafruit ISO1540 Bidirectional I2C Isolator to add full electrical isolation between two sides of an I2C bus. The chip they use, the TI ISO1540 is fully bi-directional, supports up to 1 MHz clock rates, supports clock-stretching, works with 3 to 5V DC power or logic (separate on either side of course), with 2500 V-RMS isolation\u003c\/p\u003e\n\u003cp\u003eUsage is easy - you get power\/ground\/clock\/data breakout pads for each side as well as a matching STEMMA QT connector. \u003cstrong\u003eUnlike the other QT boards, the two sides are obviously electrically isolated, which means each half must be powered!\u003c\/strong\u003e Check that the green LED is lit on both sides. Now send data over I2C and you're good to go. There are 10K pullups on each side, from the I2C pins to the matching VCC for that side.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.ti.com\/product\/ISO1540\" target=\"_blank\"\u003eFor more details about chip specifications, check out the TI product page.\u003c\/a\u003e\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\"\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\"\u003eSTEMMA QT connectors\u003c\/a\u003e on either side are compatible with the \u003ca href=\"\/en-eu\/collections\/qwiic\" target=\"_blank\"\u003eSparkFun Qwiic\u003c\/a\u003e I2C connectors. This allows you to make solderless connections between your development board and the ISO1540 or to chain it with a wide range of other sensors and accessories using a compatible cable. \u003ca href=\"\/en-eu\/products\/jst-sh-cable-qwiic-stemma-qt-compatible\" target=\"_blank\"\u003eQT Cable is not included, but we have a variety in the shop.\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eTECHNICAL DETAILS\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eISO1540 Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIsolated bidirectional, I2C compatible, communication\u003c\/li\u003e\n\u003cli\u003eSupports up to 1-MHz operation\u003c\/li\u003e\n\u003cli\u003e3-V to 5.5-V supply range\u003c\/li\u003e\n\u003cli\u003eOpen-drain outputs With 3.5-mA Side 1 and 35-mA Side 2 sink current capability\u003c\/li\u003e\n\u003cli\u003e-40°C to +125°C operating temperature\u003c\/li\u003e\n\u003cli\u003e±50-kV\/μs transient immunity (Typical)\u003c\/li\u003e\n\u003cli\u003eHBM ESD protection of 4 kV on all pins; 8 kV on bus pins\u003c\/li\u003e\n\u003cli\u003eSafety-related certifications:\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003e4242-VPK isolation per DIN VDE V 0884-11:2017-01\u003c\/li\u003e\n\u003cli\u003e2500-VRMS isolation for 1 minute per UL 1577\u003c\/li\u003e\n\u003cli\u003eCSA approval per IEC 60950-1 and IEC 62368-1 end equipment standards\u003c\/li\u003e\n\u003cli\u003eCQC basic insulation per GB4943.1-2011\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e","brand":"Adafruit","offers":[{"title":"Default Title","offer_id":32397069844563,"sku":"ADA4903","price":8.95,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/products\/4903-00.jpg?v=1612784398","url":"https:\/\/shop.pimoroni.com\/en-eu\/products\/adafruit-iso1540-bidirectional-i2c-isolator-stemma-qt-qwiic","provider":"Pimoroni Ltd","version":"1.0","type":"link"}