PDIUSBD datasheet(3/20 Pages) PHILIPS

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Philips Semiconductors

Product specification

PDIUSBD11

USB device with serial interface

1999 Jul 22

Analog Transceiver

The transceiver interfaces directly to the USB cables through some

termination resistors. They are capable of transmitting and receiving

serial data at “full speed” (12 Mbit/s) only.

PLL

A 12 MHz to 48 MHz clock multiplier PLL (Phase-Locked Loop) is

integrated on-chip. This allows for the use of low-cost 12 MHz

crystal. EMI is also minimized due to lower frequency crystal. No

external components are needed for the operation of the PLL.

Bit Clock Recovery

The bit clock recovery circuit recovers the clock from the incoming

USB data stream using 4X over-sampling principle. It is able to track

jitter and frequency drift specified by the USB specification.

Philips Serial Interface Engine (PSIE)

The Philips SIE implements the full USB protocol layer. It is

completely hardwired for speed and needs no firmware intervention.

The functions of this block include: synchronization pattern

recognition, parallel/serial conversion, bit stuffing/de-stuffing, CRC

checking/generation, PID verification/generation, address

recognition, handshake evaluation/generation.

Memory Management Unit (MMU) and Integrated

RAM

The MMU and the integrated RAM is used to handle the large

difference in data rate between USB, running in bursts of 12 Mbit/s

and the I2C interface to the microcontroller, running at up to 1 Mbit/s.

This allows the microcontroller to read and write USB packets at its

own speed through I2C.

I2C Slave Interface

This block implements the necessary I2C interface protocol. A slave

I2C allows for simple micro-coding. An interrupt is used to alert the

microcontroller whenever the PDIUSBD11 needs attention. As a

slave I2C device, the PDIUSBD11 I2C clock: SCL is an input and is

controlled by the microcontroller. The I2C interface can run up to

1 Mbit/s.

SoftConnect

™

The connection to the USB is accomplished by bringing D+ (for

high-speed USB device) high through a 1.5 k

W pull-up resistor. In

the PDIUSBD11, the 1.5 k

W pull-up resistor is integrated on-chip

and is not connected to VCC by default. The connection of the

internal resistor to Vcc is established through a command sent by

the external/system microcontroller. This allows the system

microcontroller to complete its initialization sequence before

deciding to establish connection to the USB. Re-initialization of the

USB bus connection can also be affected without requiring the pull

out of the cable.

The PDIUSBD11 will check for USB VBUS availability before the

connection can be established. VBUS sensing is provided through

VBUS pin.

It should be noted that the tolerance of the internal resistors is

higher (30%) than that specified by the USB specification (5%).

However, the overall VSE voltage specification for the connection

can still be met with good margin. The decision to make sure of this

feature lies with the users.

SoftConnect

™ is a patent pending technology from Philips

Semiconductors.

ENDPOINT DESCRIPTIONS

ENDPOINT#

ENDPOINT INDEX

TRANSFER TYPE

DIRECTION

MAX

PACKET SIZE

(BYTES)

Control

OUT

Control

Generic

OUT

Generic

OUT

Generic

OUT

Generic

NOTE:

1. Generic endpoint can be used for Interrupt or Bulk endpoint.

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