UPD1001 datasheet(14/42 Pages) MICROCHIP

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UPD1001

DS00001759B-page 14

 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.

Bulk

Capacitance

Enable

BULK_CAP

This active high output signal is used to enable/disable

the source bulk capacitance charging. In dual-role ports it

is used to disable the bulk capacitance when operating as

a consumer.

Note:

This function is only available in specific

device configurations.

System Fault

Detect

IFAULT

This active high signal is used by the power supplying

device to notify when a system fault condition has

occurred. This input is typically used for an over-current

or over-voltage condition, but can be used for any system

related failure. An external comparator should be used to

filter any external noise on this input. The device firmware

automatically handles all power exceptions by shutting

down the power supply, re-enabling it, and restarting PD

negotiation until successful.

Note:

The board design must ensure this signal is in

a valid state by the time PD_EN_N asserts.

System Reset

RESET_N

(PU)

System reset. This signal is active low.

Test

TEST

Test signal. This signal is used for internal purposes only

and must be connected to ground through a 1 K resistor

for normal operation.

TABLE 2-2:

PIN DESCRIPTIONS (CONTINUED)

Name

Symbol

Buffer

Type

Description

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