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Information as of 2000-01-10
 Latest information online
PDIUSBH11A; Universal Serial Bus Hub
| Description |  |
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The Universal Serial Bus Hub PDIUSBH11A is a cost and feature optimized second generation USB Hub with 4 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 PDIUSBH11A is ideally suited for computer monitors, docking stations, keyboards and many other applications that use the I²C or the SMBUS based architecture. The PDIUSBH11A conforms to the USB specification Rev 1.0, I²C serial interface and the SMBUS specifications. It is fully compliant with the Human Interface Device Class and Monitor Control Class specifications. Its low suspend power consumption along with the programmable LazyClock output allows for easy implementation of equipment that is compliant to the ACPI, OnNow and USB power management requirements. The low operating power allows the implementation of the bus powered or the compound powered hub function. The PDIUSBH11A is fully backward compatible to the first generation PDIUSBH11 hardware and software. This allows an easy running change in the manufacturing line to realize the cost savings. In addition, it also incorporates the feature enhancements like SoftConnectTM, GoodLinkTM, LazyClock, programmable clock output, lower frequency crystal oscillator, additional embedded functions and integration of termination resistors. All of these feature enhancements contribute to significant cost savings in the system implementation and at the same time ease the implementation of advanced USB functionality into the peripherals.
| Features | |
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- 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
- Four 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 (SoftConnectTM)
- Good USB downstream connection indicators that blink with traffic (GoodLinkTM)
- 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)
- Single 3.3V supply with 5V tolerant I/O
- Available in 32-pin SDIP 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
| Datasheet | |
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