Invention Grant
US08029187B2 Apparatus, system and method for high resolution identification with temperature dependent resistive device 有权
用温度依赖电阻器件进行高分辨率识别的装置,系统和方法

Apparatus, system and method for high resolution identification with temperature dependent resistive device
Abstract:
A temperature measuring and identification (TMID) device obtains identification information and temperature information of a connected device having a temperature sensing circuit (TSC). The TSC includes a temperature sensing element (TSE) connected in parallel with a voltage clamping network (VCN) that limits the voltage across the TSE to an identification voltage within an identification voltage range when the voltage is greater than or equal to a lower voltage of the identification voltage range. When a voltage below the lower range is applied to the TSC, the VCN appears as an open circuit and the resistance of the TSC corresponds to temperature. A translation circuit within the TMID shifts TSC voltages within the identification voltage range to a normalization voltage range. Accordingly, voltages corresponding to temperature as well as voltages corresponding to identification are within the normalization voltage range. As a result, the resolution of a voltage sensing device used for measuring the temperature and identification voltages is maximized. In addition, the translation circuit maintains a minimal current during a rest state. For cost or other concerns, a first TSC may omit the VCN to provide a maximum identification voltage and other TSCs may include VCNs with lower identification voltage ranges.
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