Multiplexer circuit for dual thermistor operation using a single line coupling

摘要

A time-multiplexed thermal sensing circuit is provided for control and sensing of two thermistors over a single line electrical coupling. The circuit may include a first diode that selectively couples or isolates a first thermistor from a sense node based on the polarity of an applied voltage to the sense node. The circuit may further include a second diode that selectively couples or isolates a second thermistor from the sense node based on the polarity of the applied voltage to the sense node such that only of the thermistors is coupled to the sense node at any time.

主权项

1. A thermal sensing circuit, said circuit comprising:
a first thermistor; a first diode coupled between said first thermistor and a sense node, said first diode configured to isolate said first thermistor from said sense node in response to a positive voltage applied to said sense node; a second thermistor; and a second diode coupled between said second thermistor and said sense node, said second diode configured to isolate said second thermistor from said sense node in response to a negative voltage applied to said sense node.