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.