Transcription of AN0046: USB Hardware Design Guidelines
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AN0046: USB Hardware Design Guidelines
AN0046: USB Hardware Design GuidelinesThis application note gives recommendations on Hardware Design for implementing USBhost and device applications using USB capable EFM32 microcontrollers along withsome example schematics for different POINTS Example Schematics for a variety ofapplications PCB Design Guidelines for | Building a more connected 1. IntroductionSome EFM32 microcontrollers, for instance selected members of the Giant Gecko and Leopard Gecko families, offer on-chip USB sup-port. The USB peripheral embedded on these devices include the USB PHY and an internal voltage regulator, thus requiring only aminimum number of external components. The on-chip voltage regulator's primary purpose is to power the EFM32 USB PHY. But as itcan deliver more current than the EFM32 needs, it can be used to power other components as well, even in non-USB applications.
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. If VDD is 3.3 V pull-up may be connected directly to USB_DMPU pin.
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