When the P89LPC90x is in programming mode all pins that are not used for programming are tri-stated. During
programming mode the reset pin has a weak pull-up resistor.
The Original USB 2.0 specification released on April 27, 2000
Errata to the USB 2.0 specification as of December 7, 2000
Mini-B connector Engineering Change Notice to the USB 2.0 specification.
Pull-up/pull-down Resistors Engineering Change Notice to the USB 2.0 specification.
Errata to the USB 2.0 specification as of May 28, 2002
Interface Association Descriptor Engineering Change Notice to the USB 2.0 specification.
Rounded Chamfer Engineering Change Notice to the USB 2.0 specification as of October 8, 2003
Unicode Engineering Change Notice to the USB 2.0 specification as of February 21, 2005
Inter-Chip USB Supplement Revision 1.0 as of March 13, 2006
Revision 1.3 of the USB On-The-Go Supplement as of December 5, 2006
Revision 1.01 of the Micro-USB Cables and Connectors Specification as of April 4, 2007
USB 2.0 Link Power Management Addendum Engineering Change Notice to the USB 2.0 specification as of July 16, 2007.
Debugging is a fascinating topic no matter what language or platform you re using. It s the only part of software development in which engineers kick, scream at, or even throw their computers. For a normally reticent, introverted group, this degree of emotion is extraordinary. Debugging is also the part of software development that s famous for causing you to pull all-nighter
This book is designed to teach you the best practices in developing Windows DNA applications.
We have avoided making this book a primer on every technology associated with
Windows DNA. If we had followed this course, this would be an encyclopedia set.
Everyone has their favorite authors and books on the various technical subject areas. The
market is full of books to teach you the basics, the how, this book tries to be different in
that we pull out the important points to teach you about the why. If you need training in
a particular technology covered in this book, Sams has a number of 24-hour and 21-day
books that cover a wide range of topics.
ABSTRACTThe flyback power stage is a popular choice for single and multiple output dc-to-dc converters at powerlevels of 150 Watts or less. Without the output inductor required in buck derived topologies, such as theforward or push-pull converter, the component count and cost are reduced. This application note will reviewthe design procedure for the power stage and control electronics of a flyback converter. In these isolatedconverters, the error signal from the secondary still needs to cross the isolation boundary to achieveregulation. By using the UC3965 Precision Reference with Low Offset Error Amplifier on the secondaryside to drive an optocoupler and the UCC3809 Economy Primary Side Controller on the primary side, asimple and low cost 50 Watt isolated power supply is realized.
摘要：本文在分析1GBT的動態(tài)開關(guān)特性和過流狀態(tài)下的電氣特性的基礎(chǔ)上，通過對常規(guī)的IGBT推挽驅(qū)動電路進行改進，得到了具有良好過流保護特性的IGBT驅(qū)動電路。該電路簡單，可靠，易用，配合DSP等控制芯片能達到很好的驅(qū)動效果Abstract：Based on the studies on the dynamic switching and over-current characteristics of IGBT，this paper makes some improvments to the original push-pull driving circuit，obtains a new IGBT driving circuit which has a good over-current protection function.The circuit is simple，reliable and easy to use.Combined with controlling chips such as DSP it will do a great job in driving applications.關(guān)鍵詞：IBGT：開關(guān)特性；驅(qū)動；過流保護；Key Words:IGBT；switching characteristics；driving:over-current protection
