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Altera_Forum's avatar
Altera_Forum
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10 years ago

Hysteresis for temperature measurement

Hello all, I am using MAX10 FPGA and want to measure the temperature via built-in temperature sensor. I have some LEDs on my PCB and I am controlling LEDs through PWM engine. I am measuring PCB...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

Usman,

To introduce some hysteresis into your calculation you need to store one (or more) calculated temperature values and use the stored value(s) when calculating your new temperature.

You'll need some time interval appropriate to your system - this might be 1ms, 1s, 1 minute or 1 hour (or something else). At each time interval you calculate a new temperature based on your newly read temperature AND your stored value(s). You will need to 'weight' each value used for the calculation appropriately - typically older values contribute less to the newly calculated value.

This will introduce hysteresis into your temperature calculation.

Cheers,

Alex