UPD1002 datasheet(18/46 Pages) MICROCHIP

18 / 46 page

UPD1002

DS00001760B-page 18

 2014 Microchip Technology Inc.

Insertion

Detect

INSERTION_DETECT

(PU)

This active low input signal should be connected to the

Insertion Detect pin on the USB Standard-A (STD-A)

receptacle. This signal is pulled high via an internal pull-

up resistor by default. Assertion (low value) qualifies a

STD-A plug insertion event and triggers transition out of

the “Startup” state of the Source Policy engine.

The device firmware implements cold socket detection

using the INSERTION_DETECT signal. Even when

operating as a provider, if the signal is high, the device

will not output voltage on VBUS. VSafe5V will only be

output upon assertion of this signal (low).

Note:

Cold socket (insertion detect) is an optional

feature in the USB PD specification. If this fea-

ture is not being used in a design, the INSER-

TION_DETECT signal must be grounded.

Note:

This function is only available in specific

device configurations.

Dead Battery

Enable

VSAFEDB_EN

This active high output signal is used to enable the dead

battery supply on a USB Standard-B (STD-B) receptacle

(consumer/provider) AC adapter. When no voltage has

been detected on VBUS, this signal is asserted every

10 s to back power an attached provider/consumer and

determine whether the attached device has specified to

be powered per the dead battery mechanisms specified

in the PD specification.

Note:

This function is only available in specific

device configurations.

External Power

Source Detect

EXT_PWR_DET

This active high signal is used to indicate an external

power source is installed. This input can be utilized as a

standard digital input, or a resistive voltage divider can be

used to determine if the wall power AC adapter or char-

ger is plugged into the platform (i.e., a qualifying “Exter-

nally Powered” status has occurred, according to the

USB Power Delivery Specification). In a typical applica-

tion, this signal level will be set by a resistor divider of the

DC barrel voltage to satisfy the device logic levels and

level tolerance.

When this signal is high, the “externally powered” bit of

the VSafe5V Fixed Supply PDO for a provider will be set.

This signal will also help determine the preferences on

role swaps. Refer to Section 3.3.4, "USB Power Delivery

Role Selection," on page 26 for additional information.

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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