Patent ID: 8303178

Claim:
A temperature detecting device, comprising: a current source, for providing a proportional to absolute temperature (PTAT) current; a plurality of resistors, connected between the current source and a ground terminal in series, for providing m voltage signals with ascending or descending voltages; a binary counter, for counting in response to a start signal, thereby generating a binary select signal, wherein the binary select signal has (n+1) bits; a multiplexer, having m input terminals, for respectively receiving the m voltage signals, and outputting a multiplexer output signal selected from one of the m voltage signals according to the binary select signal, wherein 2 n <m<2 n+1 ; a comparator, for comparing the multiplexer output signal with a reference voltage, thereby generating a comparing signal, wherein the reference voltage does not vary with temperature; and a control logic, for issuing the start signal, and when the comparing signal has a level change, the control logic controls the binary counter to record the binary select signal as a binary temperature signal.