USB2642 datasheet(12/56 Pages) MICROCHIP

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USB2642

DS00001578C-page 12

 2014-2015 Microchip Technology Inc.

5.2

Buffer Type Descriptions

5.3

Port Power Control

5.3.1

PORT POWER CONTROL USING USB POWER SWITCH

The USB2642 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.

VSS

ePad

Ground Pad

The ground pad is the only VSS for the device and must be tied to ground

with multiple vias.

TABLE 5-2:

USB2642 BUFFER TYPE DESCRIPTIONS

Buffer

Description

Input

IPU

Input with weak internal pull-up

Input with Schmitt trigger

I/O12

Input/output buffer with 12 mA sink and 12 mA source

I/O200

Input/output buffer 12 mA with FET disabled, 100/200 mA source only when the FET is

enabled

I/O12PD

Input/output buffer with 12 mA sink and 12 mA source, with an internal weak pull-down

resistor

I/O12PU

Open drain, 12 mA sink with pull-up. Input with Schmitt trigger

I/OD12PU

Input/open drain output buffer with a 12 mA sink

O12

Output buffer with a 12 mA sink and a 12 mA source

ICLKx

XTAL clock input

OCLKx

XTAL clock output

I/O-U

Analog input/output defined in USB Specification (Appendix B)

I-R

RBIAS

TABLE 5-1:

USB2642 PIN DESCRIPTIONS

Symbol

48-Pin

QFN

Buffer

Type

Description

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