INTRODUCTION
The TC1066/TCM1617/TC1068 is optimized for use with modern CPUs and ASICs that have integrated thermal diodes on-chip. This temperature proportional signal is acquired remotely via the D+ and D– inputs. It also has an on-board solid state sensor for acquiring the temperature of its own die (usually ambient temperature).
Any temperature sensing circuit will have some finite error components. Normally, for digital temperature sensors, it is fairly convenient to factor out, via software compensation, any systematic errors. For example, if it is known that the sensor will read +2.5°C high under a certain electrical or thermal condition, the user can apply a consistent offset in software to correct for it. This application note will show how to apply a compensation scheme to the TC1066/ TCM1617/TC1068 to improve its accuracy under certain conditions.