USB的DM, DP布线的问题 Cadence allegro PCB 教程
1 General Description The Universal Serial Bus (USB) transfers power in the cable as a signal named VBUS. This power is generated by the downstream facing port (host) and is supplied on pin 1 of the USB connector. VBUS is nominally +5V referenced to the GND signal (pin 4) of the USB connector, and is capable of sourcing up to 500 mA.
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USB 2.0 pins. DP/DM. D+ and D- pins are used to support USB 2.0 in all three modes, namely, low speed, full speed and high speed. These pins are provided as pairs in a receptacle to support the plug-flipping feature and are shorted in the plug connector. Super-speed pins. RXn+/RXn-, TXn+/TXn-. These lines are used to implement Rx and Tx of USB.
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You either have to switch back to system memory startup and reprogram via USART1 or use the ST-Link with SWD connection. The later is how I work with the STM32 devices. Bare metal programming and upload and debug via ST-Link with SWD. Way more control then with Arduino, although it might do debugging now.
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The Universal Serial Bus (USB) is a proven connectivity system. However, there are still design challenges in producing a USB hardware interface. Prime among these are face layout.
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USBx_DP UDPx I/O D+ I/O pin of the port x USB on-chip transceiver. This pin should be connected to the D+ pin of the USB bus. USBx_DM UDMx I/O D- I/O pin of the portx USB on-chip transceiver. This pin should be connected to the D- pin of the USB bus. USBx_VBUS UVBUS I Port x USB cable connection monitor pin.
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What is the ideal way to handle data pins D+ and D- on a USB power adapter to be compatible with fast charging on devices?
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Go to solution SARTHAK KELAPURE Associate II 2018-04-10 09:49 PM Posted on April 11, 2018 at 06:49 I am using STM32L072 on my custom board. I connected DP DM pins on USB connector directly to the DP DM pins on the MCU. I was hoping it gives me a DEBUG UART but it didn't work that way. What could be the problem? 0 Kudos Reply All forum topics
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At the PCB, the USB connector consists of 4 main signals: VBUS (+5V power), Ground and USB DP and DM. DP and DM are the differential pair. As with twisted pair cabling, these two signals must be closely matched with the following characteristics: -Equal length: Both DP and DM signals must travel the same distance. If one trace ends up
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USB_DM - Inverted data line USB_VBUS - Sensing if VBUS is connected. USB_VBUSEN - VBUS Enable, a control signal for enabling VBUS in host applications. Connect to external VBUS switch. USB_DMPU - Data Minus Pull-Up, a control signal for enabling external 4.7 kohm pull-up on USB_DM for low-speed operation.
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The USB 2.0 specification requires the USB DP/DM traces maintain nominally 90 Ohms differential impedance (see USB specification Rev 2.0, paragraph 7.1.1.3 for more details). In this design the traces are 14 mil wide with minimum line spacing of 7 mils. These numbers are derived for 13 mil distance from ground reference plane.
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The USB2.0 specification requires the USB DP/DM traces maintain nominally 90 Ohms differential impedance. In this design the traces are 14 mil wide with line spacing of 7 mils.. The ground connection for the load capacitors should be short and out of the way from return currents from USB, VBUS power lines. The load capacitors return path.
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The USB 2.0 specification requires the USB DP/DM traces maintain nominally 90 Ohms differential impedance (see USB specification Rev 2.0, paragraph 7.1.1.3 for more details).. The ground connection for the load capacitors should be short and out of the way from return currents from USB, VBUS power lines. The load capacitors return path.
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1 Introduction Atmel® AVR® XMEGA® devices now make easy to implement USB. To ensure full USB device compliance, however, there are some issues to consider while designing the hardware application. This document introduces a set of recommendations that cover the following technical topics: