USB5537B datasheet(9/79 Pages) MICROCHIP

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 2012 - 2015 Microchip Technology Inc.

DS00001682C-page 9

USB5537B

USB PORT CONTROL

PRT_PWR[7:1]/

PRT_CTL[7:1]

O12

USB Power Enable

Enables power to USB peripheral devices downstream.

Note:

This pin also provides configuration strap functions.

See Note 3-1.

VBUS

Upstream VBUS Power Detect

This pin can be used to detect the state of the upstream bus power. The

device monitors this pin to determine when to assert the internal D+ pull-

up resistor (signaling a connect event).

When designing a detachable hub, this pin should be connected to

VBUS on the upstream port via a 2:1 voltage divider. Two 100 k



resistors are suggested.

For self-powered applications with a permanently attached host, this pin

must be connected to a dedicated host control output, or connected to

the 3.3 V domain that powers the host (typically VDD33).

SPI INTERFACE

SPI_CE_N

O12

SPI Enable

SPI_CLK

O12

SPI Clock

SPI_DO

O12

SPI Serial Data Out

The output for the SPI port.

Note:

This pin also provides configuration strap functions.

See .

SPI_DI

SPI Serial Data In

The SPI data in to the controller from the ROM. This pin has a weak

internal pull-down applied at all times to prevent floating.

JTAG/OCS INTERFACE

TRST

IPU

(Note 3-4)

JTAG Asynchronous Reset

Note:

If using the SMBus interface, a pull-up on this signal will enable

Legacy Mode, while leaving it unconnected or pulled-down will

enable Advanced Mode.

DYNCPDIS_N

Dynamic Charging Port Disable

This active-low signal is used to globally disable charging port support.

Note:

This signal available in -6070 and -6080 versions only

UCS_SMBALERT_N

UCS1002 SMBus Alert

When charging port is enabled and SMBus devices are used, this signal

acts as an active-low SMBus alert.

TCK

JTAG Clock

This input is used for JTAG boundary scan and has a weak pull-down.

It can be left floating or grounded when not used. If the JTAG is

connected, then this signal will be detected high, and the software

disables the pull up after reset.

OCS1

Over-Current Sense 1

Input from external current monitor indicating an over-current condition.

Note:

This pin also provides configuration strap functions.

See Note 3-3.

TABLE 3-1:

USB5537B PIN DESCRIPTIONS (CONTINUED)

Symbol

Buffer Type

Description

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