1 Introduction

The SAMA7G5 junction temperature is measured through a temperature sensor module connected to the 12-bit Analog-to-Digital Converter (ADC). The temperature sensor output voltage (V_TEMP) varies linearly with the die temperature with a typical slope of 2.08 mV/°C and has a 25°C value ranging from 590 mV to 670 mV. Refer to the SAMA7G5 Series data sheet for more details.

The accuracy of this system is affected by various offset and gain errors, such as ADC offset error, ADC gain error, ADVREFP inaccuracies, V_TEMP slope error and V_TEMP offset error. The reading accuracy is in the ±20°C range initially, but Microchip narrows down this range by including calibration data in a specific OTP packet during SAMA7G5 manufacturing, reaching a ±5°C accuracy range.