Information as of 2000-01-10
 Latest information online
PDIUSBH12; USB 2-port hub
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| 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.
The PDIUSBH12 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 PDIUSBH12 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 | |
|
- 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 (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) 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
| Datasheet | |
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