UPD301B/C

DS00003412A-page 10

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2020 Microchip Technology Inc.

2.3.4

DUAL ROLE POWER/DATA APPLICATION (5V SOURCE, HIGH VOLTAGE SINK) (UPD301C

ONLY)

An example of a mobile device port is shown in Figure 2-4. In this example a mobile device, such as a notebook, smart-

phone, or tablet, is capable of operating as a USB host (and device if the processor is capable of OTG operation), receiv-

ing a charge, and driving an external video display through a single Type-C connection. A cross-bar switch is shown for

routing DisplayPort Alternate Mode and USB3 data to the connector, allowing port expansion and video display.

Additional notes on Dual Role Power/Data (5V Source, High Voltage Sink) Applications:

• A typical mobile device will limit the power sourcing capability to 5V only in order to preserve battery life. This is

not explicitly required and a mobile device may optionally provide up to the maximum 100W capability if the sys-

tem supports it.

• When the port is operating as a power sink/data UFP, the USB Host / Hub Downstream Port block is not required

to support USB Device / Hub Upstream Port operation.

• A 5V Source Load Switch device must be tolerant of the maximum supported sinking voltage.

• USB3 operation is optional for mobile device ports.

• DisplayPort support is optional for mobile device ports.

• If both USB3 and DisplayPort operation are omitted, the crossbar data switch is not necessary.

• USB2 signals may be connected directly to the Type-C connector; a multiplexer is not necessary as long as the

USB2 signal layout is carefully managed to keep branches to a minimum.

FIGURE 2-4:

SYSTEM BLOCK DIAGRAM - DUAL ROLE POWER/DATA APPLICATION

(5V SOURCE, HIGH VOLTAGE SINK)

Microchip

UPD301C*

*With Dead Battery

Support Enabled

CC1

CC2

LDO

Power Sink 

Load Switch

To

System Power

or

Battery Charger

VBUS_DET

Misc.

 SOC/MCU/ 

External Logic

Charging 

Capability 

Indication 

(i.e.: GPIO, 

DAC, I

5V Sou rce 

Switch

5V

USB Host / Hub 

Downstream 

Port

X‐Bar 

Data 

Mux

DP

DisplayPort

Source

USB3

USB2

ORIENTATION