Cyclone III FPGA Temperature Measurement.....

Hi Frank,

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You can measure temperature by forward biasing a substrate or PCI clamp diode.

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Have you ever implemented such a circuit? Any details?

An FPGA thermal diode is usually a diode-connected transistor, which can be sensed by say an ADM1032 I2C device

http://www.onsemi.com/pub/collateral/adm1032-d.pdf

I thought I'd read a warning not to use regular diodes for this application ...

How would you use a clamp diode in this manner? You'd have to raise the current-source voltage above VCCIO so that the diode conducted right?

Cheers,

Dave