USB2640 datasheet(18/60 Pages) MICROCHIP

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USB2640/USB2641

DS00001947C-page 18

 2015-2021 Microchip Technology Inc.

6.2

Buffer Type Descriptions

6.3

Port Power Control

6.3.1

PORT POWER CONTROL USING USB POWER SWITCH

The USB2640/USB2641 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 resis-

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

enabled creating 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

internal over-current sense filter handles the transient conditions, such as low voltage, while the device is powering up.

TABLE 6-2:

USB2640/USB2641 BUFFER TYPE DESCRIPTIONS

Buffer

Description

Input.

IPU

Input, 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.

O12PD

Output buffer with 12 mA sink and 12 mA source, with a pull-down resistor.

O12PU

Output buffer with 12 mA sink and 12 mA source, with a pull-up resistor.

ICLKx

XTAL clock input.

OCLKx

XTAL clock output.

I/O-U

Analog input/output as defined in the USB 2.0 Specification.

I-R

RBIAS.

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