Samsung RT55EANS Especificações descarregar pdf (Página 98)

98 Intel

Atom™ processor CE4100 Ref# 420826

Platform Design Guide

Intel Confidential

8.2.1.3 USB Power Sequence

With more and more USB devices used for different purposes, there is a potential issue that

a USB device might not be detected during power cycles. Intel recommends adding a delay

circuit or designing the power sequence circuit in the USB power interface to prevent this

issue.

On the development platform, the PIC (external microcontroller) is used to control the

PIC_USB_EN# signals, which are used to enable 5V VBUS_USB power rails on USB

connectors. The design is to make sure the USB controller core power is ready before the

USB devices connected to USB port are active.

Figure 8-8. Design Example

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