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The laptop will charge the phone if you have a charge-only cable, not the phone charging the laptop.

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For instance, plugging an android phone into a laptop. It’s also what enables devices to decide which will act as a power source once connected. It allows you to switch between the peripheral and host roles on your devices. The fourth pin mode is what we call the USB on-the-go (OTG). Here’s a table showing the pins of the micro USB connector: Standard older micro USB connectors have five pins, while the less common 3.0 version has ten pins. However, these versions are smaller, and you can use them for much thinner lines of equipment.Īdditionally, the micro USB is the USB standard and offers better transfer rates from an external source. The micro USB has both Type-A and Type-B USB versions available, like the 1.0 micro-USB and 2.0 micro-USB.

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Here’s a table showing the full list of pins: Micro USB PinoutĪ smaller connector became necessary as the technology required smaller USB sizes for many items like modern mobile phones and audio devices. The Type-C USB has 24 pins which you can connect reversibly. Source: Wikimedia Commons USB-C Connector Pinout However, using it in areas where your equipment might vibrate isn’t a great idea. Plus, friction holds this connector in place, making it easy to connect and disconnect. Type-A USB connectors are bigger than other connectors and have flat and rectangular shapes. Also, you can only make downstream connections with the Type-A USB as its sole use is for controllers and hubs. Plus, you can find them on host controllers, computers, flash drives, and several other items. Type-A USB is the most popular type of USB connector.

Afterward, we got the USB C type, which boasted a better data transfer speed with a more robust system.Ĭheck out the table below for the full overview of the different USB types. Originally, the USB cable could only be one of two types, and these two types included “Type A” and “Type B”. We have the Universal Host Controller Interface (UHCI), which works for all USB types, the Open Host Controller Interface (OHCI), which works with USB 1.1, and the Enhanced Host Controller Interface (EHCI), which works with USB 2.0. Note: USB host controllers have their specifications. Once the host completes the loading of necessary device drivers, the hardware/device will be ready for use. To do this, the host uses a product ID/vendor ID (PID/VID)-which the connected hardware or device supplies.

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So, when you plug in an external device for the first time, the host device scans it and loads the correct driver version required to run the device. Thus, without a pull-up resistor, the USB won’t detect your connected device or if you have a broken device or broken connector. Now, the host or hub will also use these pull-up resistors to detect when you connect a compound device to its port. How it really Worksįirst, a USB device will show its maximum speed by using pull-up resistors to draw the “D+” and “D-” terminals to 3.3V. It also helps you avoid several issues like illegal loopback connections and connecting a downstream port to another downstream port. This helps you avoid misconnections and makes sure you connect the USB cable only in the right direction.

Now, the hosts also have downstream connections that allow them to connect to the remote devices.įurthermore, you can’t use upstream and downstream connections interchangeably. These remote devices use this upstream connection to connect to a host. So, to establish a connection, USB remote devices feature what we call an upstream connection. It’s essential to make correct USB connections to allow the system to follow the required USB protocol. Like all connectors, all types of USB connectors have male and female types, making sure you connect your devices in the right direction.

Check out the table below for the full USB pinout. Two of these wires are for power supply, while the other two are for differential data signal pairs. The USB has four shielded wires that work as pins. So, in this article, we’ll explain everything about the USB and give different USB examples for your circuits. However, that’s just the surface of it all. Also, there are cases where you can add additional USB network hubs to create a tree connection structure. Normally, the architecture of a USB system includes a host controller, USB ports, and a wide variety of devices.

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USB stands for Universal Serial Bus and has since replaced its predecessors (FireWire, RS-232 serial, and even parallel) as the primary interface for connecting a host to a device. Nowadays, it’s easy to complete projects that involve creating a physical connection between a host controller and several other bus-powered devices because of the USB interface.