Friday, June 29, 2012

ESD Risk

Cadence PCB Design Blogs



Shocking Rules and Material Remove ESD Risk in Allegro PCB Smartphone Designs

Posted: 27 Jun 2012 08:30 AM PDT

Static electricity can send shocks through your body.  We have all experienced walking across carpet on a dry day and then touching a metal doorknob.  This shock discharge is formally known as Electrostatic Discharge (ESD).  ESD can be annoying to us on a dry day or when wearing nylon clothing, but it can be much more serious to electronic devices.  When the current associated with what may seem like a harmless shock enters into electronic equipment, the electronic components inside may suffer permanent damage.

Working to resolve these ESD challenges is a privately held, San Jose based, venture backed company --- Shocking Technologies, Inc.  Its patented Voltage Switchable Dielectric™ (VSD) polymer nano‐composite material, XStatic®, can be applied to PCB and package substrates, and it dramatically improves ESD protection to the components in electronic devices.  When the material is combined with strategic PCB design rules, Shocking Technologies can boast that they provide the industry's only solution capable of up to 100 percent protection against ESD.

While the electronics industry has recognized the need for ESD protection, the amount of protection provided by traditional methods only provides minimal protection.  Also, traditional methods risk adverse effects on high speed signaling interfaces making it difficult to meet compliance standards. And to make matters worse, with IC node geometry reductions, electronic components have become more susceptible to ESD due to the decrease in fabrication geometry size.  ESD engineering experts have recognized the need to better manage ESD, but also realized that an ESD solution cannot impact performance of the product.  And since handheld devices are the most susceptible to ESD, it is also recognized that an ESD solution must be cost sensitive in order to address the needs of the consumer market.

The Shocking Technologies' VSD material is a polymer nano-composite that functions as an insulator (dielectric) during normal circuit operation and becomes conductive when the voltage increases beyond a predefined characteristic voltage. The VSD material becomes an insulator again after the voltage drops back below the characteristic voltage to normal operating levels.  The solution is of high value to any handheld product due to the susceptibility that comes with the day to day operation of such devices.

 Shocking Materail and PCB rules protects components from ESD pulses

Shocking's XStatic™ material will clamp high voltage ESD events nearly instantaneously

 

Shocking Technologies and Cadence have agreed to collaborate together to provide automated support to their joint customers to enable up to 100 percent ESD protection.  Smartphone and tablet design teams under pressure to meet tight market windows will benefit from the automation that ensures predictable design cycles.


Let us know about your thoughts about working with Shocking Technologies' XStatic material and Allegro PCB design tools.

TeamAllegro

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ADW’s Bulk Editing

Cadence PCB Design Blogs



What's Good About ADW's Bulk Editing? Check out the 16.5 Release and See!

Posted: 18 Jun 2012 12:56 PM PDT

The 16.5 Allegro Design Workbench (ADW) release provides bulk editing support. This is a huge time saver for librarians! The bulk editing provides you with the ability to operate on a set of parts or models.

Read on for more details …

In the ADW Library Workbench, when you Search by Classification, you can now:    
  • Select multiple parts or models
  • Edit-All
  • Check-out
    • Edit property values in list
    • Add new part rows
    • Edit linked properties (any linked model or property)
    • JEDEC_TYPE
    • PPLs
    • EMBEDDED_PLACEMENT
    • etc.
  • Import /Export  CSV
  • Check-in All
    • Comments Apply to All option
  • Release
    • Verify/Release All


Search by classification:




Select parts from results list
RMB – Edit All:



Select Parts Node
RMB – Check-out:

Edits may be made on groups of models

  • Edit comments, etc.
  • To check-in the group of models, it is advised to turn off rules for simple edits, otherwise check-in individually
Edit Field Values
  • Ctrl/C copy
  • Ctrl/V paste

RMB menu items for easier and fast editing -

  • Duplicate - Duplicates an existing row
  • New Row – Adds new empty row
  • Delete Row
  • Export part data to a csv file, then import the csv to Excel, edit the data, then import the updated csv

Edit/Add Associations

  • Schematic models
  • Footprint models
  • Alternate Footprints
  • Data sheets





I look forward to your feedback!

Jerry "GenPart" Grzenia

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Wednesday, June 13, 2012

Object Visibility Layers in DEHD

Cadence PCB Design Blogs



What's Good About Object Visibility Layers in DEHDL? The Secret's in the 16.5 Release!

Posted: 12 Jun 2012 02:00 PM PDT

In the 16.5 Design Entry HDL (DEHDL) release, Object Visibility Layers are introduced. The different objects in DEHDL are now available on different layers and you are provided a toolbar for which the visibility of each of object layer can be controlled. This is similar to displaying layers of objects in Allegro PCB Editor.

Read on for more details …

The different DEHDL object types available are:

  1. Components/Symbols
  2. Nets
  3. Properties
  4. Notes
  5. Images

The visibility of each object layer can be controlled by pressing or de-pressing the toolbar buttons. Pressing any object layer button makes that object invisible and de-pressing, shows the objects of that layer.

On a schematic sheet, by default all the objects are visible and the toolbar looks like:

 

With this default setting, all the objects are visible on the schematic sheet:

 

By pressing any of the buttons, for example Nets, then all the nets are made invisible on the schematic canvas:



 

 

You can use the visibility toolbar to select objects of the same type to perform common operations. As an example, in the case of very dense schematics, this feature can be used to hide all the properties to make the connectivity of the design more clear.
 
The following steps explain the procedure of selecting objects:
 
1. Draw a selection box and everything inside gets selected.
2. Press all the visibility layer buttons one by one and see the objects of the particular layer disappear from the schematic canvas.
3. Press only the Symbols button and make all the symbols visible.
4. Select the menu option Group> Create> By Rectangle.
5. Draw a selection box and the symbols in the selection box become part of the group.
6. Select the menu option Group> Add Property…
7. Specify a property value pair: FOO = BAR
8. This property gets added to all the symbols which were members of the group.

Please share your experience using this new capability.

Jerry "GenPart" Grzenia

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