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 UPD72012.
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 UPD72012.
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.