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Altera_Forum
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13 years ago

Cyclone III FPGA Temperature Measurement.....

Hi All, I want to measure the temperature across the cyclone III fpga. Is there any inbuilt sensor is available for the temperature measurement? If yes please let me know the procedure t...
Altera_Forum's avatar
Altera_Forum
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13 years ago

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