UPD301B/C

DS00003412A-page 8

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2020 Microchip Technology Inc.

2.3.2

TWO-PORT, THREE-PORT, AND FOUR-PORT SOURCE-ONLY APPLICATIONS

(E.G., AUTOMOTIVE REAR SEAT CHARGING) (UPD301B ONLY)

Some applications, such as a automotive rear seat charging port, may need multiple USB Type-C™ power delivery

ports. These ports can be implemented by connecting a UPD301B and a UPD350 via the SPI interface, as shown in

Figure 2-2. The UPD301B will execute the stack for the UPD350. The two-port implementation supports dynamic power

allocation (e.g., go-to power min based on an external input).

FIGURE 2-2:

SYSTEM BLOCK DIAGRAM - TWO-PORT APPLICATION

Microchip

UPD301B

CC1

CC2

60W Load 

Switch

DC In

Load Switch

DC‐DC 

Converter

60W Load 

Switch

DC In

Load Switch

DC‐DC 

Converter

Microchip

UPD350

CC1

CC2

SPI

M

S

POWER

Control I/O

(GPIO, DAC, 

or I

Fault Indicator

Control I/O

(GPIO, DAC, 

or I

Fault Indicator

VBUS_DET

VBUS_DET

RESET

Optional

Optional