38K0 datasheet(45/328 Pages) RENESAS

45 / 328 page

FUNCTIONAL DESCRIPTION

Rev.2.00

Oct 05, 2006

page 28 of 112

38K0 Group

REJ09B0337-0200

HARDWARE

USB Port External Circuit Configuration

The operation mode of the USB port driver circuit can be config-

ured by USB control register (address 001016).

Figure 25 and Figure 26 show the USB port external circuit block

diagram.

“1”

“0”

USB Reference

Voltage Circuit

PLL

UCLKCON

VREFE

VREFCON

DVCC

Full

Speed

USBE

USB

Module

XOUT

fVCO

TRONCON

TRONE

USBVREF

TRON

D0+

D0-

2.2

µF

Ω

USBE

VREFCON

Hiz

3.3V output

Normal mode

USBVREF status

fUSB

USBDIFE

Full

Speed

3.3V output

Low-power mode

0.1

µF

Ω

1.5 k

Ω

Fig. 25 USB port external circuit (D0+, D0-, USBVREF, TrON) block diagram (4.0V

≤≤≤≤≤ VCC ≤≤≤≤≤ 5.25V)

Fig. 26 USB port external circuit (D0+, D0-, USBVREF, TrON) block diagram (3.0V

≤≤≤≤≤ VCC ≤≤≤≤≤ 4.0V)

“1”

“0”

PLL

UCLKCON

Full

Speed

USBE

USB

Module

XOUT

fVCO

TRONCON

TRONE

USBVREF

TRON

D0+

D0-

Ω

USBE

fUSB

USBDIFE

Full

Speed

0.1

µF

Ω

1.5 k

Ω

3.0V to 3.6V (Note)

Note: In Vcc = 3.0 V to 3.6 V connect this pin to Vcc.

38K0 Datasheet(PDF) 45 Page - Renesas Technology Corp

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