Preliminary

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2

Pin Description

Note 1: OE

H

Note 2: OE

L

Functional Description

The USB1101 transceiver is designed as an Upstream fac-

ing port device to convert CMOS data into USB differential

bus signal levels and to convert USB differential bus signal

to CMOS data. If you wish to use these as downstream

devices, Config must be hard-wired to GND.

To minimize EMI and noise the outputs are edge rate con-

trolled with the rise and fall times controlled and defined for

full speed data rates only (12Mbits/s). The rise and fall

times are balanced between the differential pins to mini-

mize skew.

The USB1101 supports the DAT_VP/SE0_VM format from

the OTG Transceiver Specification using the DAT_SE0

Mode. Table 1 describes the specific pin functionality selec-

tion and Table 2 describes the specific Truth Tables for

Driver, Receiver, and Suspended operating functions.

The USB1101 has the capability of serving Self Powered

power supply configurations only but interfaces to mixed

voltage supply applications.

TABLE 1. Function Select

Note 3: Signal levels is function of connection, Config and/or pull-up/pull-down resistors.

Note 4: For Suspnd

HIGH mode the differential receiver is inactive.

Pin Number

Pin Name

I/O

Pin Description

1

Config

I

USB connect or disconnect software control input. Configures 3.3V to

internal 1.5k

: resistor on D when HIGH. If device is used as Downstream

port then this pin is hard-wired to GND.

2OE

I

Output Enable (active LOW)

When OE

L transmit mode is enabled

When OE

3

DAT_VP

I/O

L DAT_VP is a single ended

data output comprised of the differential input data from the D

/D inputs

(see Table 2);

H DAT_VP outputs the D



data.

(see Table 1 and Table 2) Output drive is 2mA (min) buffer

4

SE0_VM

I/O

L, SE0_VM is used as an out-

put (see Table 2)

(see Table 1 and Table 2). Output drive is 4ma (min) buffer

5

GND

GND

GND

6

Suspnd

I

L the DAT_VP pin will be a function

of the D

/D lines.

H DAT_VP will have the value of D



such that the device can still monitor out-of-suspend signaling.

7, 8

D

, D

AI/O

Data

, Data. Differential data bus conforming to the USB standard

Pwr

Supply Voltage for host side digital I/O pins (1.65V to 3.6V)

10

Pwr

Supply Voltage Input (3.0V to 3.6V)

Suspnd

OE

D

, D

DAT_VP

SE0_VM

Function

L

L

Transmitting

Host Data Input

SE0_VM Host Input

Normal Driving

L

H

Receiving (Note 3)

D

, D Diff Output

SE0_VM Output

Receiving

H

L

Transmitting (Note 4)

Host Data Input

SE0_VM Host Input

Driving while Suspended

H

H

Driver is 3-STATE

(Note 4)

DAT_VP Output

SE0_VM Output

Suspended

(Internal Low Power Mode)