38K2 datasheet(47/358 Pages) RENESAS

47 / 358 page

FUNCTIONAL DESCRIPTION

Rev.2.00

Oct 15, 2006

page 28 of 130

38K2 Group

REJ09B0338-0200

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.

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

≤ VCC ≤ 5.25V)

“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. 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.

38K2 Datasheet(PDF) 47 Page - Renesas Technology Corp

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