FUSB3317

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4

PIN FUNCTION DESCRIPTION

Pin No.

Pin Name

I/O Type

Description

11

VBUS

Input

Output VBUS voltage to the Type C connector (Input voltage to the FUSB3317 to check for

OVP and UVP)

2

VBAT

Supply

Input power for the FUSB3317 directly from a battery for automotive applications or from

a DC−DC supply for industrial

19

VDD

Output

Supply voltage generated internally from VBAT (output from FUSB3317). This pin is

connected to a 1 mF external capacitor.

13

GND

Ground

Connect to board ground but not connector ground

12

CATH(FB)

Open Drain Output

Feedback to control the power supply. Typically connected to the error amplifier output of

a DC−DC regulator (often called the compensation pin). For a fuse option, connected to

the feedback pin at the resistor divider (FB) of the DC/DC.

8

VFB

Input

Output Voltage Sensing Signal. This pin is used for CV regulation, and it is tied to the

internal CV loop amplifier non−inverting input terminal. It is tied to the output voltage

resistor divider

9

IFB

Input

Constant Current Amplifying Signal. The voltage level at this pin is the amplified current

sense signal.

6

IS+

Input

Current sensing amplifier positive terminal. Connect this pin directly to the positive end of

the current sense resistor with a short PCB trace. This is usually the connector ground

terminal.

7

IS−

Input

Current sensing amplifier negative terminal. Connect this pin directly to the negative end

of the current sense resistor with a short PCB trace. This is usually the board ground.

17

DC_EN

Output

Active High output turns on the DC−DC controller when a Type C Sink is detected.

14

DISC

Open Drain Output

Discharge pin. This pin is tied to VBUS with a discharge resistor in the path to discharge

VBUS at the connector.

3

CC1

I/O

Configuration Channel 1. This pin is used to detect USB Type−C devices and

communicate over USB PD.

5

CC2

I/O

Configuration Channel 2. This pin is used to detect USB Type−C devices and

communicate over USB PD.

20

D+

D+: I/O

D+: Connected to D+

1

D−

D−: I/O

D−: Connected to D−

15

PDIV1

Input

Programmable pin to select different USB Power Delivery Power (PDP) value dynamically

18

PDIV0

Input

Programmable pin to select different USB Power Delivery Power (PDP) value dynamically

16

NTC

I/O

Pin connected to external NTC resistor to sense PCB or connector temperature

10

DON

Output

For USB 2.0 data, this pin is tied to the Switch Control of the USB 2.0 data switch to turn

the switch on (5 V HIGH = Switch ON)

4

BATUV

Input

Determines a threshold at which FUSB3317 will scale down the advertised power since the

battery voltage is too low