What are the maximum g forces an FPGA could operate under?E.g. an FPGA sitting in a car wheel, where the car is travelling at 100km/hr experiences approx 400g due to the centripetal acceleration.(assuming a 15" diameter wheel).Can anyone point to products or applications where this is donealready? (I know tyre pressure sensors are coming..but these are notFPGAs)What would the mass of your typical FPGA package/silicon be? Say a 256ball BGA(e.g. FT256 or similar). Force = mass x acceleration so I guessyou could work out the force on the solder balls etc etc.I know vibration probably is an issue also - but at least that can bemitigated to some extent with the mechanical design of our product,e..g vibration damping etc. However, the centripetal force is anothermatter - its always there whenever the wheel is rotating. (and growswith the square of the cars velocity).

Your figures seem correct, close to the outside of the wheel.The first thing you should think about is how not to have the FPGAthere. Maybe you need sensors or outputs in the wheel itself, but doyou really have to process the information there? Take a look insidea VCR to see how high-bandwith signals are communicated with thespinning heads.If you can't avoid it, keep the circuit close to the axis, so theacceleration is less.

Is it the tire pressure you are going to meassure? In that case there are indirect ways of doing that: You don't need any sensors in the wheel, and thus no FPGA in, or communication with, the wheel either.../JohanMart-- -----------------------------------------------Johan Bernspång, Research engineerSwedish Defense Research Agency - FOIDivision of Command & Control SystemsDepartment of Electronic Warfare SystemsPlease remove the x's in the email address ifreplying to me personally.-----------------------------------------------

Can an FPGA be operated reliably in a car wheel?

May 07, 2006 43 Replies

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Johan Bernspång 20 years ago

Is it the tire pressure you are going to meassure? In that case there are indirect ways of doing that:

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You don't need any sensors in the wheel, and thus no FPGA in, or communication with, the wheel either...

/Johan

Mart>

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----------------------------------------------- Johan Bernspång, xjohbex@xfoix.se Research engineer Swedish Defense Research Agency - FOI Division of Command & Control Systems Department of Electronic Warfare Systems www.foi.se Please remove the x's in the email address if replying to me personally. -----------------------------------------------

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Symon 20 years ago

Of course, if you've got those run-on-flat tyres maybe you don't care about the pressures?

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:-) Cheers, Syms.

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fpga_toys 20 years ago

Sounds more like time for a good FPGA accellerated computer model :)

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Johan Bernspång 20 years ago

That might be the ultimate solution.. =D

/Johan

Sym> Of course, if you've got those run-on-flat tyres maybe you don't care about

----------------------------------------------- Johan Bernspång, snipped-for-privacy@xfoix.se Research engineer

Swedish Defence Research Agency - FOI Division of Command & Control Systems Department of Electronic Warfare Systems

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Please remove the x's in the email address if replying to me personally.

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