DESCRIPTION
The Universal Serial Bus Hub PDIUSBH12 is a cost and feature optimized second generation USB Hub with 2 downstream ports and 3 embedded functions (compound hub). It is normally used in any microcontroller-based system and communicates with the system microcontroller over the high speed I2C serial bus. This modular approach to implementing a hub and embedded functions allows the designer to choose the optimum system microcontroller from the available wide variety. This flexibility cuts down the development time, risks and costs by allowing the use of the existing architecture and the firmware investments. This results in the fastest way to develop the most cost-effective USB peripheral solutions that need hub functionality. The PDIUSBH12 is ideally suited for computer monitors, docking stations, keyboards and many other applications that use the I2C or the SMBus based architecture.

FEATURES
• Complies with the Universal Serial Bus specification Rev. 1.0
• Complies with the ACPI, OnNOW, and USB power management requirements
• Compliant with USB Human Interface Devices and Monitor Control Class
• Compliant with System Management Bus Specification Rev. 1.0
• Two downstream ports with per packet connectivity and auto speed detection
• Supports up to 3 embedded functions
• Integrated SIE (Serial Interface Engine), FIFO memory and transceivers
• Automatic USB protocol handling
• High speed slave I2C Interface (up to 1 Mbit/s)
• Compatible with the PDIUSBH11 hardware and software
• Software controllable connection to USB bus (SoftConnect)
• Good USB downstream connection indicators that blink with traffic (GoodLink)
• Low frequency 12 MHz crystal oscillator eases EMI design issues
• Programmable output clock frequency
• Bus powered capability with very low suspend current
• Controllable LazyClock output at 30 kHz (nominal) during suspend
• Single 3.3V supply with 5V tolerant I/O
• Available in 28-pin DIP and SO packages
• Full-scan design with high fault coverage (>99%) insures high quality
• Higher than 8 KV in-circuit ESD protection lowers cost of extra components