usb pinout

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usb pinout

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Bezpośrednia odpowiedź USB connectors share a simple logic—power VBUS, differential data D+D-, and ground—but the exact pin count ranges from 4 pins on legacy USB-A to 24 pins on reversible USB-C, which now supports up to 240 W at 48 V under USB Power Delivery 3.1 EPR 12. Szczegółowa analiza | Connector | Total pins | Key signals | Typical view for pin 1 | Notes | |-----------|-----------|-------------|------------------------|-------| | USB 2.0 Type-A | 4 | 1 = VBUS +5 V, 2 = D-, 3 = D+, 4 = GND | Left-most when looking into receptacle | Cable colors: Red, White, Green, Black 3 | | USB 3.x Type-A | 9 4 legacy + 5 SS | Extra pins 5–9 form one TXRX SuperSpeed lane full-duplex 5 10 Gbps | Same as above | Down-compatible with USB2 plugs 4 | | USB 2.03.x Type-B | 4 9 | Same signal naming as Type-A | Pin 1 is top-left in receptacle | Square shape prevents mis-mate 3 | | Mini-B | 5 | Pins 1-4 as Type-A, Pin 4 = ID | Notch-up, pin 1 on right | Largely obsolete | | Micro-B | 5 | ID pin supports OTG host bias | Notch-up, pin 1 on left | Rated 10 000 cycles 5 | | Micro-B Superspeed | 10 | Pins 1-5 = USB2, 6-10 = SS | Same as Micro-B | Dual-tongue connector 4 | | USB Type-C | 24 A & B rows mirrored | • 4× VBUS • 8× GND • 4× USB2 D± • 4× SSUSB4 lanes • 2× CC • 2× SBU | Pin A1 is top-row, outer-edge | Flippable; negotiates 5 V ÷ 48 V, 0.5 A ÷ 5 A 2 | Electrical statistics USB-IF nominal limits • VBUS default current: 0.5 A USB 2.0, 0.9 A USB 3.x, 3 A USB-C default, up to 5 A with E-marked cable 2. • Cable differential impedance: 90 Ω ± 10 % for both USB2 and SuperSpeed pairs 4. • Insertion lifetime: 1 500 cycles Type-A, 10 000 cycles Micro-B, 10 000+ cycles Type-C 5. Aktualne trendy i kontekst “USB Type-C delivers the one-cable solution for data, display, and up to 240 watts of power,” emphasizes USB-IF President Jeff Ravencraft 6. – EU Directive 20222380 mandates USB-C as the common charging port for most portable electronics by December 2024 7. – USB4 v2 draft 1.0 released 2023 doubles lane rate to 80 Gbps on the same Type-C pinout 8. – Over 4 500 certified USB-C products are listed by USB-IF as of Q2 2024, a 35 % YoY increase 9. Wskazówki wdrożeniowe najlepsze praktyki 1. Route SuperSpeed or USB4 TXRX pairs as 90 Ω ± 10 % differential and match lengths within 7 mil 180 µm to limit skew. 2. Place ESD diodes within 1 cm of the connector on all high-speed and CC lines. 3. Tie both CC pins together on a receptacle but never on a plug; use CC resistors Rp, Rd per PD spec to advertise or detect current. 4. Reserve 2 × 0402 footprints for BMC PD PHY or microcontroller if future firmware updates may add PD negotiation. 5. Isolate shield to chassis ground via 1 MΩ ∥ 4.7 nF for better EMI while avoiding ground loops. 6. For OTG on Micro-USB, pull the ID line to GND host or leave floating device. Do not hard-wire VBUS unless supplying power. 7. Verify cable gauge: delivering 5 A at 20 V requires 20 AWG or lower to meet 50 mV drop per meter guideline 2. Aspekty etyczno-prawne – “USB” and the trident logo are registered USB-IF trademarks—membership or license is required for product labeling. – USB-C PD can source lethal 48 V; IEC 62368-1 creepage rules apply on internal PCBs. – EU eco-design rules encourage detachable, user-replaceable cables to cut e-waste Directive 2019770. – Respect privacy: CC sniffing can reveal device identity—treat captured PD logs as personal data under GDPR. Propozycje dalszych badań • Signal-integrity impacts of 240 W EPR cables longer than 2 m. • Integration of Qi2 wireless charging pads with USB-C PD trigger circuits. • Feasibility of single-pair USB2-only “cost down” Type-C cables for IoT sensors. • Material science for >20 000-cycle plating e.g., ruthenium on Type-C springs. Podsumowanie • Legacy USB-AB connectors use 4–9 pins; MicroMini add an ID pin for OTG. • USB-C exposes 24 reversible pins, enabling USB4 80 Gbps and 48 V 5 A PD 3.1. • Proper layout—impedance control, ESD, CC resistors—is critical for high-speed reliability. • Regulatory momentum EU common charger and rapid product certification growth ensure USB-C dominance through the decade. --- Sources 1 USB Type-C® & USB-PD 3.1 Specification Rev 2.2, USB-IF, Oct 2023. 2 USB Power Delivery Rev 3.1, section 3.2 “EPR: 28 V, 36 V, 48 V @ 5 A”. 3 “USB Pinout: Everything You Need to Know”, NextPCB blog, 2023. 4 USB 3.2 Specification, USB-IF, 2022; Annex E impedance. 5 IEC 62680-1-3:2018 Micro-USB Cables and Connectors. 6 J. Ravencraft, Keynote at USB DevDays 2022, Seattle, WA. 7 European Parliament Press Release, 4 Oct 2022, “Common charger adopted”. 8 USB4™ Version 2.0 Draft 1.0, USB-IF, Sep 2023. 9 USB-IF Certified Product Database, accessed May 2024 4 503 Type-C listings.

USB pinout guide: USB-A, USB-B, Micro-USB, USB-C, Power Delivery, OTG, EU directive

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Podsumowanie

Connector	Total pins	Key signals	Typical view for pin 1	Notes
USB 2.0 Type-A	4	1 = VBUS (+5 V), 2 = D-, 3 = D+, 4 = GND	Left-most when looking into receptacle	Cable colors: Red, White, Green, Black [3]
USB 3.x Type-A	9 (4 legacy + 5 SS)	Extra pins 5–9 form one TX/RX SuperSpeed lane (full-duplex 5 / 10 Gbps)	Same as above	Down-compatible with USB2 plugs [4]
USB 2.0/3.x Type-B	4 / 9	Same signal naming as Type-A	Pin 1 is top-left in receptacle	Square shape prevents mis-mate [3]
Mini-B	5	Pins 1-4 as Type-A, Pin 4 = ID	Notch-up, pin 1 on right	Largely obsolete
Micro-B	5	ID pin supports OTG host bias	Notch-up, pin 1 on left	Rated 10 000 cycles [5]
Micro-B Superspeed	10	Pins 1-5 = USB2, 6-10 = SS	Same as Micro-B	Dual-tongue connector [4]
USB Type-C	24 (A & B rows mirrored)	• 4× VBUS • 8× GND • 4× USB2 D± • 4× SS/USB4 lanes • 2× CC • 2× SBU	Pin A1 is top-row, outer-edge	Flippable; negotiates 5 V ÷ 48 V, 0.5 A ÷ 5 A [2]