TUSB1106 datasheet(17/33 Pages) TI

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(3.3)

SPEED

SOFTCON

RCV

VPO/VO

1.65Vto3.6V

System ASIC

D–

D+

1.5kW

BUS

CC(5.0)

reg(3.3)

SUSPND

MODE

(A)

VMO/FSE0

CC(I/O)

0.1µF

33 W

TUSB1105/1106

GND

Peripheral-Side (Low-Speed) Internal Regulator Mode

TUSB1105, TUSB1106

ADVANCED UNIVERSAL SERIAL BUS TRANSCEIVERS

SCAS818D – MAY 2006 – REVISED FEBRUARY 2008

Figure 11. Peripheral-Side (Low-Speed) Internal Regulator Mode

Only for TUSB1105

The USB side of the TUSB1105/1106 can be powered from the VBUS line directly if a 3.3-V supply is not present

on board. In this case, the internal regulator can be used to provide the 3.3-V supply for the USB signaling. The

VCC(5.0) is connected to the VBUS, which receives 5-V supply from the host, and generates the 3.3-V output at the

Vreg(3.3) pin. In this mode, it is important that both VCC(5.0) and Vreg(3.3) pins have individual bypass capacitors in

the range of 0.1

µF. Powering V

CC(5.0) through the VBUS port of the USB connector realizes significant power

saving for portable applications, such as cell phones, PDAs, etc. In this operating mode, the ICC(5.0) current is fed

from the host side. The USB-side power consumption, ICC(5.0) is 4 mA (with the regulator active), as opposed to

logic-side ICC(IO) of 1 mA under full-speed operation. While operating at low speed, the 1.5-kΩ resistor must be

connected between the D- line and the VPU(3.3) or an external 3.3-V supply.

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