UPD1002
DS00001760B-page 18 2014 Microchip Technology Inc.
Insertion
Detect
INSERTION_DETECT IS
(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 O8 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 IS 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