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.