TUSB1106-Q1

SCAS916

– AUGUST 2011

www.ti.com

FUNCTIONAL DESCRIPTION

Function Selection

FUNCTION TABLE

SUSPND

OE

D+, D

–

RCV

VP, VM

FUNCTION

L

L

Driving and receiving

Active

Active

Normal driving (differential receiver active)

L

H

Active

Active

Receiving

H

L

Driving

Active

H

H

Active

Low-power state

(1)

Signal levels on D+ and D

– are determined by other USB devices and external pullup/pulldown resistors.

(2)

In suspend mode (SUSPND = HIGH) the differential receiver is inactive and output RCV is always LOW. Out of suspend (K), signaling is

detected via the single-ended receivers VP and VM.

(3)

During suspend, the slew-rate control circuit of low-speed operation is disabled. The D+ and D

– lines are still driven to their intended

states, without slew-rate control. This is permitted because driving during suspend is used to signal remote wakeup by driving a K signal

(one transition from idle to K state) for a period of 1 ms to 15 ms.

Operating Functions

Driving Function (Pin OE = L)

Using Differential Input Data Interface

DATA STATE

VMO

VPO

DATA

LOW SPEED

FULL SPEED

L

L

SE0

X

X

H

L

Differential logic 0

J

K

L

H

Differential logic 1

K

J

H

H

Illegal state

X

X

Table 1. Receiving Function (Pin OE = H)

DATA STATE

D+, D

–

RCV

LOW

FULL

SPEED

SPEED

Differential

L

L

H

J

K

logic 0

Differential

H

H

L

K

J

logic 1

SE0

L

L

X

X

(1)

disconnected).

(2)

RCV* denotes the signal level on output RCV just before SE0 state

occurs. This level is stable during the SE0 period.

Power-Supply Configurations

The TUSB1106-Q1 can be used with different power-supply configurations, which can be dynamically changed.

An overview is given in Table 3.

•

Normal mode

connected to a 5-V source (4 V to 5.5 V). The internal voltage regulator then produces 3.3 V for the USB

the external circuit.

•

Disable mode

internal circuits of the TUSB1106-Q1 ensure that the D+ and D

– pins are in 3-state and the power

consumption drops to the low-power (suspended) state level. Some hysteresis is built into the detection of

•

Sharing mode

pins are made 3-state and the TUSB1106-Q1 allows external signals of up to 3.6 V to share the D+ and D

–

4

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Copyright

© 2011, Texas Instruments Incorporated

Product Folder Link(s): TUSB1106-Q1