Figure 7: Temperature sensor connection pads
A Port PT1 for second external temperature sensor (not supported by the standard firmware)
B Port PT0 for external temperature sensor
C Port PT2 for external reference resistor
D 10 nF COG
However, there is a possibility to connect the reference resistor and the thermistor externally to
the chip, too. In case of external resistors, the temperature-stable reference resistor ought to be
connected at port PT2REF on the plug-in board. The board allows you to connect the external
thermistor, e.g. a PT1000 sensor at port PT0 (or PT1, not supported yet by the standard firmware).
In any case, for the temperature measurement, an external capacitor 10 nF C0G has to be
connected to the chip; it is already pre-assembled on board.
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