The μPD72012 is a dedicated LSI for a HUB connected to a universal serial bus (USB) system. It is an upgrade of NEC’s μPD72011. It complies with USB specification revision 1.1. By putting descriptors into ROM, information such as a user’s vendor ID can be implemented in the chip.

FEATURES

? Compliant with Chapter 11 (HUB Specifications) of USB Specification 1.1.

? Descriptors into ROM

? The user can customize the vendor ID and product ID by using Mask ROM option.

? Supports 5 kinds of string descriptors (for Mask 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 μPD72012.

? 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 μPD72012.

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.