Patent ID: 8033720

Claim:
A temperature sensing circuit comprising a temperature sensing unit for generating a reference voltage having a constant level, regardless or a temperature fluctuation, and a variable voltage to be changed according to the temperature fluctuation; and a comparison unit for comparing the reference voltage to the variable voltage, detecting an ambient temperature and generating a temperature detecting signal, wherein the temperature sensing unit comprises a plurality of voltage dividing elements connected in series between a driving voltage supply terminal for receiving the driving voltage and a first node, an enable element connected between the first node and a ground voltage level in order to enable an operation of the voltage dividing elements in response to a first enable signal, a control voltage generating unit for generating a first voltage in response to the reference voltage, the control voltage generating unit including a first level controlling element connected between the driving voltage supply terminal and a second node, and a first temperature element connected between the first node and the second node to generate the first voltage in response to the reference voltage, and an amplifying unit for generating the variable voltage in response to the first voltage.