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Broadcom Goes Pedal-to-the-Metal With Ethernet & NFC

1/5/2015 11:30 AM EST
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kabuto15
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Re: ESD
kabuto15   1/31/2015 2:27:38 PM
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I'd be very carefull with statements like: "ESD protection is required for parts which are not in circuit". Why? Because I can always find path from "not in circuit" to "in circuit" - only what I have to do is to use accordingly high voltage :)
Example 1: you have opening in the housing just above your MCU. I can apply 25kV through this hole and burn your IC. So in this case: IC was "in circuit" or "not in circuit"?

Due to having better ESD performance within Automotive parts you can survive much more stress than when using commerical parts.

And important business case - when you have better ESD protection built in IC, then you can save some money on external protectors.

prabhakar_deosthali
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Re: ESD
prabhakar_deosthali   1/31/2015 5:39:01 AM
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As far as my knowledge goes, ESD protection is required for parts which are not in circuit, Once a part becomes part of a circuit it is less likely to accumulate any electrostatic charge .

So what is the specific need for higher ESD protection in Auto grade components?

krisi
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Re: auto-grade
krisi   1/11/2015 11:51:07 AM
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Yes, ESD introduction introduces additional parasitic capacitance which slows down high-speed IO circuitry...but this has to be taken care of during the design process....once designed properly I still don't see how it affects bit error rate of the IO communication

kabuto15
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Re: auto-grade
kabuto15   1/11/2015 4:39:15 AM
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@krisi - ESD stress can highly affect chip internal impedance (eg. we can see degradation of capacitance). It can lead to bus impedance dismatching and can cause higher BER (Bit Error Rate), bus errors or even bus shutdown. For Active Safety solutions (eg. Emergency Braking, Active Cruise Control) high reliable communication is a must :)

Therefore automotive parts typically have higher ESD rating. As additional information - automotive specifications define a lot of ESD test (to moreless simulate real world) eg:

- with part unpowered and powered

- with different ESD pulses voltages and polarities

- with different discharge models etc.

so we can be confident that electronic in our cars is safe under all conditions

krisi
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Re: auto-grade
krisi   1/10/2015 12:27:55 PM
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Not sure what is teh link between ESD and reliable chip communication

krisi
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Re: auto-grade
krisi   1/10/2015 12:26:42 PM
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Could you be more specific pls?

Anand.Yaligar
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Re: auto-grade
Anand.Yaligar   1/10/2015 10:57:37 AM
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@kabuto15: Yes they should. These electronics for cars are always high grade electronics and therefore they have undergone a series of gruelling quality control tests. No wonder the supply chain is heaving large breaths of tension while supplying for the auto market of 2015 ande beyond.

Anand.Yaligar
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Re: auto-grade
Anand.Yaligar   1/10/2015 10:54:37 AM
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"What does it mean that Broadcom's parts are auto-grade? Better ESD protection? EMI performance? lifetime of their chips? temperature range?"

@krisi: I think they take all of the parameters in question and make high-performance chips because where human reflexes will fail under a threatening situations, the communication between these chips would be of extreme importance to handle the situation. 

kabuto15
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Re: auto-grade
kabuto15   1/5/2015 3:18:24 PM
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Not only part parameters are taken into account for automotive qualification (but of course it's significance part). Also manufacturing process, its quality and reliability should meet automotive  requirements. For eg. manufacuring plant has to be automotive qualified etc... Please take a look in google on Production-Part-Approval-Process (PPAP).

Summary -> a lot of effort from chip maker side.

krisi
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auto-grade
krisi   1/5/2015 2:10:03 PM
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What does it mean that Broadcom's parts are auto-grade? Better ESD protection? EMI performance? lifetime of their chips? temperature range?

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