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How can I interface an NTC thermocouple with pic??
You can't, because an NTC is not a thermocouple.
An NTC is a resistor whose resistance varies (nonlinearly) with temperature. From your mentioning Steinhart-Hart coefficients I assume you have an NTC.
A thermocouple is an interface of two different metals that generates a voltage proportional to temperature.
For either of the two sensors you will need a suitable signal conditioning circui that converts either the resistance of the NTC or the small voltage from the thermocouple to a voltage that can be measured by the ADC of a PIC.
An NTC's resistance can easily be measured by driving a current through the NTC and measuring the voltage drop. Here is an application note by microchip
that gives the relevant information.
If you don't know the parameters of the NTC, you can measure the resistance<>temperature characteristic (compare table 2 in the application note) and evaluate the resulting table to arrive at the coefficients (see app note and also e.g. Wikipedia