{"product_id":"m5stack-pahub-v2-1-pca9548a-6-channel-u040-b-v21","title":"M5Stack PaHub v2.1 – PCA9548A 6-Channel I2C Hub | U040-B-V21","description":"\u003cp\u003e\u003cvideo controls muted playsinline style=\"width:100%;height:auto;border-radius:8px;\"\u003e\u003csource src=\"https:\/\/m5stack.oss-cn-shenzhen.aliyuncs.com\/resource\/docs\/products\/unit\/Unit-PaHub2.1\/U040-B-V21%20PaHub%20V2.1%20video.mp4\" type=\"video\/mp4\"\u003e\u003c\/video\u003e\u003c\/p\u003e\u003cp\u003eThe M5Stack PaHub v2.1 expands one host I2C connection into six software-selectable Grove channels for sensor arrays, test fixtures, modular systems, and devices with duplicate I2C addresses. Its PCA9548AP multiplexer allows identical-address peripherals to coexist when they are placed on separate channels and selected independently. A DIP switch sets the hub address from 0x70 to 0x77, enabling multiple hubs on one upstream bus. Reliable systems still require power budgeting, pull-up analysis, cable-length control, capacitance management, and disciplined channel selection.\u003c\/p\u003e\u003ch2\u003ePaHub v2.1: Core Functions and Control\u003c\/h2\u003e\u003ch3\u003eConnect Six Downstream I2C Channels\u003c\/h3\u003e\u003cp\u003eOne upstream port can access six Grove branches and organize peripherals by physical channel.\u003c\/p\u003e\u003ch3\u003eResolve Duplicate Peripheral Addresses\u003c\/h3\u003e\u003cp\u003eIdentical devices can be placed on separate branches and accessed one at a time through the multiplexer.\u003c\/p\u003e\u003ch3\u003eSet the Hub Address from 0x70 to 0x77\u003c\/h3\u003e\u003cp\u003eThe DIP switch allows several PaHub units to share one upstream bus when each uses a unique address.\u003c\/p\u003e\u003ch2\u003ePaHub v2.1 Applications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eMultiple identical I2C sensors\u003c\/li\u003e\n\u003cli\u003eI2C address-conflict separation\u003c\/li\u003e\n\u003cli\u003eEnvironmental sensor arrays\u003c\/li\u003e\n\u003cli\u003eModular production test fixtures\u003c\/li\u003e\n\u003cli\u003eExpanded embedded monitoring systems\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eHow to Integrate the PaHub v2.1\u003c\/h2\u003e\u003col\u003e\n\u003cli\u003eWith power removed, set the DIP switch to an unused address from 0x70 to 0x77.\u003c\/li\u003e\n\u003cli\u003eConnect the host to the input and attach peripherals to intended channels.\u003c\/li\u003e\n\u003cli\u003eSelect the required branch before communicating with the device at its normal address.\u003c\/li\u003e\n\u003cli\u003eTag data with the channel number and change branches before accessing duplicate-address devices.\u003c\/li\u003e\n\u003cli\u003eVerify total current, pull-ups, cable length, capacitance, and recovery behavior.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch2\u003ePaHub v2.1 Deployment Notes\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eThe hub multiplexes branches; it does not increase bus speed or supply unlimited power.\u003c\/li\u003e\n\u003cli\u003eDuplicate-address devices still conflict if their channels are enabled simultaneously.\u003c\/li\u003e\n\u003cli\u003eExcessive pull-ups, cable length, capacitance, or voltage drop can cause instability.\u003c\/li\u003e\n\u003cli\u003eCascading hubs adds software state and troubleshooting complexity.\u003c\/li\u003e\n\u003cli\u003eChange DIP-switch settings only while power is off.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003ePaHub v2.1 Development Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/docs.m5stack.com\/en\/products\/sku\/U040-B-V21\" target=\"_blank\" rel=\"nofollow noopener noreferrer\"\u003eM5Stack PaHub v2.1 Official Documentation\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/uiflow2.m5stack.com\/\" target=\"_blank\" rel=\"nofollow noopener noreferrer\"\u003eUiFlow2 Development Environment\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/docs.arduino.cc\/software\/ide\/\" target=\"_blank\" rel=\"nofollow noopener noreferrer\"\u003eArduino IDE\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"LogicBoundless","offers":[{"title":"Default Title","offer_id":49240346722519,"sku":"LB-M5-U040-B-V21","price":8.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0801\/8952\/2135\/files\/1_bc5fad0f-4666-4ece-b77b-00f635ec2ea4.webp?v=1783243272","url":"https:\/\/logicboundless.com\/products\/m5stack-pahub-v2-1-pca9548a-6-channel-u040-b-v21","provider":"LogicBoundless","version":"1.0","type":"link"}