Apalis Carrier Board Design Guide - Toradex

Apalis Carrier Board Design GuideX1CUSBO1_D-USBO1_D+USBO1_SSTX-USBO1_SSTX+USBO1_SSRX-USBO1_SSRX+USBO1_VBUSUSBO1_IDUSBO1_OC#USBO1_ENUSBH_OC#USBH_EN76747068646260722622749684L2USBO1_D_N 2 3USBO1_D_P 1490R@100MHz3.3V3.3VR1100K R2USBO1_VBUS100KUSBO1_IDUSBO1_OC#SHIELD21USBO1_D_CON_NUSBO1_D_CON_PD13 4RCLAMP0504S565V_ESD 5VL34AC139R@100MHz100nFSHIELDX22D-3D+VCC_USBO11VCC4GND61729-0010BLFGND_USBO1L12A220R@100MHzOptionalVCC_USBO1R3330RGNDS1S2SHIELDUSBH2_D-USBH2_D+8280LED1GNDGREENUSBH3_D-USBH3_D+8886USBH4_D-USBH4_D+USBH4_SSTX-USBH4_SSTX+USBH4_SSRX-USBH4_SSRX+Apalis - USB3 of 25MM70-314-310B1100981041069294Figure 23: USB 2.0 client reference schematic2.5.2.3 USB 3.0 Host Connector Schematic ExampleThe following schematic example shows how to use the USBH4 port as a USB 3.0 host interface. AsUSB 3.0 is backward compatible, this port could also be used as a USB 2.0 host interface.RX/TXUSB 2.0/1.1USBH4_D+USBH4_D+USBH4_D-USBH4_D-TVSDiodeD+D-RX/TXUSB 2.0/1.1USB 3.0 HostTXSuperSpeedRXModuleConnectorTVSDiodeTVSDiodeUSBH4_SSTX+USBH4_SSTX-2x 100nFUSBH4_SSRX+USBH4_SSRX-USBH4_SSTX+USBH4_SSTX-USBH4_SSRX+USBH4_SSRX-SSTX+SSTX-SSRX+SSRX-USB 3.0 ConnectorUSB 3.0 ConnectorRXSuperSpeedTXUSB 3.0 Device2x 100nFApalis ModuleCarrier BoardUSB CableFigure 24: USB 3.0 host block diagramUSB DriveThe power enable signal USBH_EN is shared with the other two host interfaces USBH2 and USBH3.If the USB bus power supply needs to be switched individually for each port, any free pin withGPIO functionality could be used. In this case the USB driver needs to be modified to support suchan implementation.The USBH_OC# signal is shared between all the USB host ports of the Apalis. Since the signal isopen drain type, it can be connected directly to the all overcurrent output ports. The signal requiresa pull-up resistor on the carrier board.Toradex AG l Altsagenstrasse 5 l 6048 Horw l Switzerland l +41 41 500 48 00 l www.toradex.com l info@toradex.com Page | 29