UPD1002 datasheet(17/46 Pages) MICROCHIP

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 2014 Microchip Technology Inc.

DS00001760B-page 17

UPD1002

VBUS

Discharge

VBUS_DISCHARGE

This active high output is used to drive a power NFET to

discharge VBUS during high-to-low voltage transitions in

order to achieve vSafe0V. When asserted, the external

MOSFET should conduct to GND through a current limit-

ing resistor. This signal de-asserts when the VMON sig-

nal voltage reaches a preset value (a percentage of the

destination voltage).

VBUS

Out

VBUS_OUT

This active high output is used on an Upstream Facing

Port (UFP) to tell the hub to stay connected. This signal

will remain asserted at all times that a valid VBUS level is

present (VBUS minimum of 4.5 V to PD VBUS maximum

20 V+10%) on the UFP, as well as during any voltage

transitions or role swaps where the voltage may drop

below 4.5V.

Note:

Per the OTG specification, data connectivity

roles can be swapped and a micro-AB con-

nector with a micro-A plug inserted can oper-

ate as an “upstream” port (as a device).

Therefore, VBUS_OUT assertion behavior as

per above is not only valid with a micro-B

cable, but also a micro-A cable so that the

USB data link is not lost during PD swaps.

Note:

This function is only available in specific

device configurations.

USB ID

Indicator

USB_ID_IND

This signal is used in micro-AB pinouts to indicate to the

OTG host whether a micro-A plug (Legacy, Low Power or

PD) is present. If a micro-A plug is present, this pin is low.

Otherwise it is high.

Emulation

Enable

CHG_EMU_EN

This active high output signal can be used to drive the

Emulation Enable pin of a Microchip UCS1001 or similar

device that supports BC 1.2. The device will assert this

signal whenever operating at VSafe5V without a PD con-

tract. Whenever a PD contract is established (even at

5 V), this signal is de-asserted.

Note:

This function is only available in specific

device configurations.

TABLE 2-2:

PIN DESCRIPTIONS (CONTINUED)

Name

Symbol

Buffer

Type

Description

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