USB82640 datasheet(16/64 Pages) MICROCHIP

No. de pieza	USB82640

Descripción Electrónicos	Automotive USB 2.0 Hub and Flash Media Card Controller Combo

PDF	64 Pages

Scroll/Zoom	100%

Fabricante Electrónico	MICROCHIP [Microchip Technology]

Página de inicio	http://www.microchip.com

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16 / 64 page

USB82640

DS60001312A-page 16

 2010-2015 Microchip Technology Inc.

5.3

Port Power Control

5.3.1

PORT POWER CONTROL USING USB POWER SWITCH

The USB82640 has a single port power control and over-current sense signal for each downstream port. When disabling

port power, the driver will actively drive a 0. To avoid unnecessary power dissipation, the internal pull-up resistor will be

disabled at that time. When port power is enabled, the output driver is disabled, and the pull-up resistor is enabled cre-

ating an open drain output.

If there is an over-current situation, the USB Power Switch will assert the open drain OCS signal. The Schmitt trigger

input will detect this event as a low. The open drain output does not interfere. The over-current sense filter handles the

transient conditions, such as low voltage, while the device is powering up.

FIGURE 5-1:

PORT POWER CONTROL WITH USB POWER SWITCH

USB82640

USB Power

Switch

5 V

USB

Device

PRTCTL3

OCS

USB Power

Switch

5 V

USB

Device

PRTCTL2

OCS

USB82640 Datasheet(PDF) 16 Page - Microchip Technology