
PRELIMINARY DATA SHEET
HUB CONTROLLER FOR UNIVERSAL SERIAL BUS
1999
Document No. S13918EJ2V0DS00 (2nd edition)
Date Published May 1999 N CP(K)
PD72012
μ
MOS INTEGRATED CIRCUIT
The
μ
PD72012 is a dedicated LSI for a HUB connected to a universal serial bus (USB) system.
It is an upgrade of NEC’s
μ
PD72011. It conforms to Ver. 1.1 of the latest USB specifications.
By putting descriptors in ROMization, information such as a user’s vendor ID can be implemented in the chip.
FEATURES
{
Conforms to Chapter 11 (HUB Specifications) of USB Specification 1.1 which is latest specifications.
{
Descriptors in ROMization
The user can customize the vendor ID and product ID.
{
Supports 5 kinds of string descriptors (for User ROM code product only)
{
On-chip sequencer
There is an on-chip descriptor and request response sequencer. External initial setup and control is not needed
and HUB functions can be realized using only the
μ
PD72012.
{
Downstream ports
Four or five ports can be selected using a pin function.
{
Power modes
Bus power or self-power can be selected using a pin function (an external power control circuit is required).
{
Corresponds to standard descriptor products
Two kinds of standard ROM code products are provided. Standard and HUB class descriptors are on-chip in
the
μ
PD72012.
ROM code: 003 (individual overcurrent monitoring type Generic HUB)
ROM code: 004 (collective overcurrent monitoring type Generic HUB)
{
Supports two kinds of clock input
48-MHz oscillator input or a 4-MHz crystal resonator can be supported
{
Power control
Port power control and overcurrent detection functions are on-chip. Individual port control or collective control
can be selected for these.
ORDERING INFORMATION
Part No.
Package
μ
PD72012CU-XXX
μ
PD72012GB-XXX-3B4
42-pin plastic shrink DIP (600 mil)
44-pin plastic QFP (10
×
10 mm)
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all devices/types available in every country. Please check with local NEC representative for
availability and additional information.