NEC switch User Manual

User’s Manual  U12978EJ3V0UD

The 

µPD789800 incorporates a regulator that powers the USB driver/receiver.  The features are as follows.

•  Generates V

REG

 (3.3 

±0.3 V) from V

DD0

, V

DD1

 (4.0 to 5.5 V) and outputs it to the REGC pin.

•  Supports power-saving mode, reducing power consumption in mode.

Regulator

PD789800

RXD

USB driver/
receiver

SEP

SEM

TXDP

TXDM

TXEN

RXEN

V

DD0

V

SS0

V

SS

V

REG

V

DD0

V

SS0

USBDM

Hub

REGC

22   F

1.5 k

Ω

USBDP

µ

µ

µµµµF capacitor.

Ω

Ω

Ω

Ω) for the USBDM pin to the REGC pin.