Temperature sensing is important to monitor for the lifetime and proper operation of the system. The TMP461 is used to measure temperature locally from –55 to 105°C with a target accuracy of 1.5% (approximately ±2°C) and remotely from –55 to 125°C (approximately ±1.5°C). The temperature measurement is represented as a 12-bit digital code for both local and remote sensors. For remote temperature sensing, an example transistor, Q4, is used and are typically low-cost discrete NPN or PNP transistors, or substrate thermal transistors or diodes that are integral parts of microprocessors, analog-to-digital converters (ADC), digital-to-analog converters (DAC), microcontrollers, or field-programmable gate arrays (FPGA).

Figure 2-6 TMP461-SP - Local and Remote Temperature Sensing