Is there any way to have on chip temp monitor?

[bouchy]

thanks

 

[layoutmaster]

You can use a simple diode. Since the diode current is dependent of Temp you can monitor the current across the diode and detect temp variations from there...

 

[bouchy]

Thanks layoutmaster, but isn't the saturated current Is a function of the temp?
Id=Is exp(Vd/Vt) and Vt= KT/q.

 

[layoutmaster]

In particular yes, but also the not saturated one, which is:

ID = Is x (exp(Vd/Vt)-1)