Breaking News
Design How-To

Toyota accelerations revisited—hanging by a (tin) whisker

1/10/2012 05:08 AM EST
18 comments
NO RATINGS
More Related Links
View Comments: Newest First | Oldest First | Threaded View
<<   <   Page 2 / 2
Etmax
User Rank
Rookie
re: Toyota accelerations revisited—hanging by a (tin) whisker
Etmax   1/11/2012 11:39:04 AM
NO RATINGS
Please don't forget that apart from needing almost twice the energy in production (I thought carbon emissions were to be avoided) lead free PCB's generally don't survive rework/repair due to copper migration from the PCB surface to the tin. This results in more scrap/waste. Also I have read that lead doesn't leach out of solder in land fill (one of the excuses for RoHS) and there has been no noticeable increase in lead levels of people performing materials recovery (the other excuse for RoHS) That said, many of the other substances banned under RoHS legislation are a problem and the world is better without them, eg. Chromium VI and Cadmium.

MN0
User Rank
Rookie
re: Toyota accelerations revisited—hanging by a (tin) whisker
MN0   1/11/2012 10:15:07 AM
NO RATINGS
It's becoming increasingly obvious that the RoHS push for lead-free solder and platings was extremely poorly thought out. As well as the tin whisker problem, lead-free solder requires higher temperature soldering (putting more stress on components), and solder joints are much more likely to suffer mechanical fatigue. Just another example of environmentalists creating huge problems in the "real world".

eembedded_janitor
User Rank
Rookie
re: Toyota accelerations revisited—hanging by a (tin) whisker
eembedded_janitor   1/10/2012 9:56:59 PM
NO RATINGS
Faults like tin whiskers are exactly the reason why the pedal sensor has two pots. The values of the two pots are compared against an expected profile and if there is any discrepancy, the sensor is deemed to be faulty and power is limited to "limp home" mode. By the way, more modern sensors use hall effect sensing which is not prone to mechanical damage like pot wipers.

<<   <   Page 2 / 2
Top Comments of the Week
August Cartoon Caption Winner!
August Cartoon Caption Winner!
"All the King's horses and all the KIng's men gave up on Humpty, so they handed the problem off to Engineering."
5 comments
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Times on Twitter
EE Times Twitter Feed
Radio
LATEST ARCHIVED BROADCAST
David Patterson, known for his pioneering research that led to RAID, clusters and more, is part of a team at UC Berkeley that recently made its RISC-V processor architecture an open source hardware offering. We talk with Patterson and one of his colleagues behind the effort about the opportunities they see, what new kinds of designs they hope to enable and what it means for today’s commercial processor giants such as Intel, ARM and Imagination Technologies.
Flash Poll