Cypress Semiconductor CY62148ESL Betriebsanweisung PDF herunterladen (Seite 11)

C M M - 52259 J U N E 1 1 , 2 0 1 0

U S E R G U I D E

Device Mode

The CMM-52259 may act as either a bus-powered or a self-powered device. As a bus-

powered device, the CMM-52259 will take input voltage and current through the USB connec-

tor. As a self-powered device, the CMM-52259 must be powered through the barrel connector.

The VBUS input is designed to prevent back-driving VBUS if the board is powered externally.

Connecting a mini-B cable to the CMM-52259 signals the user application to configure as a

USB Device. In this configuration, VBUS output is disabled and the CMM-52259 may be po-

wered from the USB bus. The user application must take care not to enable VBUS output to

prevent damage to the CMM-52259 or USB HOST.

As a USB Device, pull-ups on DM and DP determine USB communications speed. Enabling

the DP pull-up selects full-speed mode while enabling the DM pull-up selects low-speed.

On-The-Go Mode

The On-The-Go supplement (OTG) to the USB2.0 specification enables dual role operation.

An OTG appliance can take on HOST mode and DEVICE mode operations based on the type

of cable attached. An OTG appliance can also switch modes during a USB session using the

Host Negotiation Protocol (HNP) and Session Request Protocol (SRP) application program-

ming interface (API). The CMM-52259 is designed to allow user applications to sense the ID

pin voltage level when a USB cable is attached.

Figure 3 below shows the control signals associated with HOST and DEVICE Mode.

Figure 3: USB Configuration

USB

Signal

Function

Control Signal

Host

Mode

Device

Mode

USB data(-) signal

USB_DM

USB data(+) signal

USB_DP

DM Pull

Down

DM pull-down control

USB_DM_PDOWN/PQS5

Applied

DP Pull

Down

DP pull-down control

USB_DP_PDOWN/PQS6

Applied

DM Pull-

DM pull-up control

PUC2

Applied for

low-speed

DP Pull-

DP pull-up control

PUB3

Applied for

high-speed

VBUS /

USB ID

Sense/Enable VBUS

output

USB_BVUSCHG/PUC3

Low

High

VBUS

FAULT

Indicate VBUS fault

TP5

NOTE: The customer must apply a jumper wire between TP5 and an IO header signal to

access the VBUS over-current indicator signal.

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