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DS00002016G-page 29

USB5742

8.4.2.3

Port Power Control with Single Poly Fuse and Multiple Loads

Many customers use a single poly fuse to power all their devices. For the ganged situation, all power control pins must

be tied together.

8.4.3

PORT CONTROLLER CONNECTION EXAMPLE

FIGURE 8-6:

PORT POWER CONTROL WITH GANGED CONTROL WITH POLY FUSE

FIGURE 8-7:

USB5742 WITH 2 GENERIC PORT POWER CONTROLLERS (1 BC ENABLED)

Note:

The CFG_BC_EN configuration strap must be properly configured to enable battery charging on the appro-

priate ports. For example, in the application shown in Figure 8-7, CFG_BC_EN must be connected to an

external 200 kΩ pull-up resistor to enable battery charging on Port 1 only. For more information on the

CFG_BC_EN configuration strap, refer to Section 3.4.4, "Battery Charging Configuration (CFG_BC_EN)".

USB

Device

Poly Fuse

5V

Pull-Up Enable

Pull-Up Enable

50k

50k

PRTPWR

OCS

USB

Device

PRT_CTLx

PRT_CTLy

USB5742

Port 1

Connector

Generic Port

Power Controller

POWER

(High Current)

(BC Enabled)

OCS

D+

D

-

VBUS

D+

D-

PRT_CTL1

Port 2

Connector

Generic Port

Power Controller

POWER

OCS

D+

D

-

VBUS

D+

D-

PRT_CTL2