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Etmax
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re: Toyota accelerations revisited—hanging by a (tin) whisker
Etmax   1/11/2012 11:39:04 AM
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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
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re: Toyota accelerations revisited—hanging by a (tin) whisker
MN0   1/11/2012 10:15:07 AM
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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
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re: Toyota accelerations revisited—hanging by a (tin) whisker
eembedded_janitor   1/10/2012 9:56:59 PM
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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.

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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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