UPD301BT datasheet(9/45 Pages) MICROCHIP

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2020 Microchip Technology Inc.

DS00003412A-page 9

UPD301B/C

2.3.3

BUS-POWERED OR BATTERY POWERED SINK-ONLY APPLICATIONS (UPD301C ONLY)

An example of a bus powered power sink (Sink-Only) application is shown in Figure 2-3. A bus powered Sink-Only appli-

cation derives all power from the upstream VBUS connection and does not have any other power source. The UPD301C

device with dead battery support should be selected for all Sink-Only devices. The dead battery Rp terminations allow

the Sink-Only device to be detected and powered from an attached DFP port when connected in an unpowered state.

Additional notes on Bus-Power or Battery Powered Sink-Only Applications:

• USB data support is optional.

• If USB3 data is supported, a 2:1 multiplexer may be required to handle Type-C cable insertion reversibility. Device

controllers and hubs specifically designed to support USB Type-C may also integrate the reversibility functionality.

• USB Alternate Modes may also be supported in Sink-Only applications.

• DisplayPort support is optional for mobile device ports.

• 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 at a minimum.

FIGURE 2-3:

SYSTEM BLOCK DIAGRAM - SINK-ONLY APPLICATION

Microchip

UPD301C*

*With Dead Battery

Support Enabled

CC1

CC2

LDO

VBUS

Power Sink

Load Switch

System Power

Battery Charger

VBUS_DET

Misc.

SOC/MCU/

External Logic

Charging

Capability

Indication

(i.e.: GPIO,

DAC, I

2C)

USB Device /

Hub Upstream

Port

2:1

Data

Mux

USB3

USB2

ORIENTATION

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