Methods of Estimating Component Temperatures

Part 2 – Case Temperature

by Matt Romig and Sandra Horton, Texas Instruments

In electronics systems, the case temperature (sometimes referred to as top temperature) of a component often is easy to measure. Fortunately, the component case temperature is very close, both physically and thermally, to the component junction temperature. This means that you can estimate the component’s junction temperature by measuring it’s case temperature during operation. You can use the thermal parameter Psi-JT (ΨJT) for this purpose since it is unique for a particular component under typical use conditions, and is generally provided by the component manufacturer. This article details the proper method to determine the component junction temperature by measuring the case temperature. By carefully addressing component temperature, you can ensure operation within the thermal limits of the component.

 

Methods of Estimating Component Temperatures

Part 1

by Matt Romig and Sandra Horton, Texas Instruments

It is well known that IC components heat up during operation as they dissipate power while doing their analog and digital magic. But how can the user determine if a component (semiconductor device) is too hot? Many engineers have seen videos on this or may even have personal lab experience with overloaded components which start to smoke or melt. What is not commonly known, however, is that well below this temperature the component function or reliability starts to degrade. How can you be certain that each component in an electronic system is within its safe operating range?

 

Creating a Virtual Factory

Averna’s Proligent Keeps Tabs and Makes Changes Where Needed

by Bryon Moyer

We in the semiconductor world live in a relatively self-contained environment. Processing is highly specialized, equipment is expensive and not really usable for anything else, and risks are high if something goes wrong.

So we tend to get a little, oh, inbred, with a few companies providing the variety of tools and services in a small-town supply chain.

 

Leading Lattice

Billerbeck Steers a Fresh Course

by Kevin Morris

Darin Billerbeck looks out of place and restless in the dark, heavy, ostentatious ambiance of Lattice Semiconductor’s boardroom. Like a well-trained athlete donning his grandfather’s hat and cane, his energy bursts through the seams - fighting with the oppressive atmosphere that echoes the values of his predecessors. Lattice was once a house of hierarchy - a top-down, micro-managed, dictatorship where blame flowed downward and credit upward.

Today, the baroque trappings of the company’s tumultuous past are being cleared to make way for a cleaner, more welcoming future. Pieces of art that adorned the hallways as silent reminders to the passers-by that they were in the presence of power far greater than their own are being sold off - and ping-pong tables and discussion lounges are appearing in their place. Lattice is undergoing a cultural transformation of epic proportions, and evidence is everywhere you look.

 

Packing Them In

A Look at High-Density PC – er – PWBs and Persecution of Solder

by Bryon Moyer

The world of PC boards – or, as they seem to be more widely called in the official literature, “printed wiring boards” or PWBs – has been a conservative one. For the most part, things are still done today like they were a few decades ago. Sure, dimensions have gone down, and we can do many, many more layers, and we can put passives on the back side, but, except for the bleeding edge, we pretty much do things the old-fashioned way: etch metal off of a board made out of some kind of resinous material, glue several of those together if needed, poke parts through the holes or stick them onto pads, and run the whole thing through a wave-soldering line. Some wires (particularly, white ones) may even be soldered by hand.

 

Board Market Mysteries

Unraveling the Paradox of PCB Tool Rankings

by Kevin Morris

We talk a lot about chips around here - custom ICs, FPGAs, embedded processors, memories - silicon gets a good bit of coverage in the pages of EEJ. However, all that silicon has to eventually get parked and connected up somewhere, and that somewhere is usually on a PCB.

Unlike chips, unless you’re shipping your product with a standard board or module, you have to design the board yourself, specifically for your product. That means, although we spend way more time talking about design tools for the creation of custom and customized chips, most of the EDA tools actually being used out there in the world are doing board design.

 

You Got It

They Want It

by Jim Turley

Security is an arms race. The good guys come up with new ways to hide data and the bad guys eventually find ways to break in anyway. You update your security; they update their attacks. In true arms race fashion, both sides spend a lot of time and energy to stay right where they are.

And, like a grimmer sort of arms race, civilians can wind up among the casualties. In our case, engineers are learning that they need to include security features in their products whether they like it or not. Seemingly innocuous products like vending machines, home appliances, and handheld gizmos now often need security features because somebody might hack the device and make something unpleasant happen. As we design and sell more of these gizmos, their security becomes more of an issue.

 

Shanghaied in Sydney

If You Dig a Hole Through the Bottom of the EDA Market - Do You Wind Up in China?

by Kevin Morris

No one has ever made the mistake of calling Altium “timid.” As long as they’ve been in business, the company co-founded by Nick Martin has been making bold and controversial moves. This week, Altium’s announcement that their company headquarters would be moving from Sydney, Australia to Shanghai, China is no exception.

In the beginning, the company provided the alterna-tool for designers who wanted to do their own PCB layout but didn’t have big corporate budgets. ProTel made a name for themselves in low-cost desktop PCB design. Competing with rivals like OrCad (now part of Cadence), the company put the world on notice that they weren’t content with the status-quo in EDA and that they were going to be following their own drummer. ProTel became synonymous with low-cost PCB design.

 

Papa's Got A Brand New Bag

Texas Instruments Buys National Semiconductor, Re-learning the Lesson of the Osborne 1 and an O-Scope That Will Run on Your iPhone

by Amelia Dalton

In this week’s Fish Fry, Amelia tries to unravel the complexities of Texas Instruments’ recent (planned) acquisition of National Semiconductor, celebrates the birthday of the world’s oldest portable computer and checks out a new o-scope coming to your iPhone or iPad.

 

Old Is The new New

A Hardware Design Language for All, Apps for Your O-Scopes and Chip-Scale Wireless Networks

by Amelia Dalton

In this week’s Fish Fry, Amelia investigates the re-birth of an old system language coming back into style, delves into the world of cloud-based applications for oscilloscope users and checks out a cool new way to connect the pieces on your board using a nano-wireless router. Also this week, she reveals super cool nerdy giveaway and offers up a surprise award to next week’s winner.

 

Building a Better Bridge To Tomorrow

Multi-core, Microservers and NASA’s Open Source Summit

by Amelia Dalton

In this week’s Fish Fry, Amelia debates the nature of the word multi-core and examines some new standards that will hopefully make multi-core implementation easier in the future. Amelia also digs into the newest Intel/ARM battle in the world of Servers, investigates some fuzzy TSA Math and looks forward to the first annual NASA Open Source Summit. Also this week, she offers up a new way to create energy (coming to a pond near you) and serves up a brand new nerdy giveaway.

 

3D ICs

Managing and Optimizing Off-chip Interfaces

by John Park, Mentor Graphics

It wasn’t very long ago that managing off-chip interconnect was a no-brainer. The interconnect path was very straight forward. It started at a pad on the chip, went out through a bond wire then connected to a metal lead, which connected to the PCB. The number of “interfaces” was small; a total of 4 counting the pad on the chip, the bond wire, the metal lead and the PCB, as illustrated in Figure 1.

 

Fair Trading

by Dick Selwood

Until the coming of the railway, many European towns, in addition to their regular market, would have an annual fair. These were important events, with merchants travelling long distances to sell exotic goods. The privilege of holding a fair was jealously guarded, and the license or charter was given or withheld by a ruler. In my home town, Winchester, the Bishop had the license for the fair and charged the traders rent. To ensure that they got value for their money, the Bishop closed all the normal shops in the town for the duration of the fair. In time, some of the fairs became known for specialisms: for example Frankfurt was the centre for books.

 

The Dichotomy Of Power

Less is More, More is Too Much, and Harnessing The World Around Us

by Amelia Dalton

In Fish Fry this week, Amelia tries to unravel the “aloha” of electronic engineering terminology; what we can do to make more power, use less power, and how we can measure exactly how much power our design is using - or is going to use. In this “power” themed episode, she investigates Microsemi’s new solar energy announcement, looks into a cool new way to create wave energy and offers up some ideas on how we can use less energy in our systems. She also checks out a new tool that will help you understand the the power budget of your next design and reflects upon a very old technology being re-born in today’s modern shipping technology.

 

Passing the Prototyping Torch

Tribal Knowledge from Synopsys and Xilinx

by Kevin Morris

You might think FPGA companies wouldn’t care much about people doing FPGA-based prototypes. After all, these aren’t the people that design an FPGA into their product and then buy a bazillion for manufacturing use. They buy a single-digit number of big parts, and they’re set.

You might also think that EDA companies wouldn’t be all fired up to support FPGA-based prototypers either. After all, aside from a few prototyping boards, and maybe some partitioning software, what do they stand to gain by making the prototyper successful?

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