2 Temperature Sensor System Description

Figure 2-1. Temperature Sensor System Block Diagram

The temperature sensor system uses a 12-bit Analog-to-Digital Converter (ADC) managed by an ADC Controller (ADCC), providing an enhanced resolution of up to 16 bits. The Temperature Sensor and Voltage Reference module output two voltages, V_TEMP and V_BG, which are internally connected to ADC channel 31.

Both voltages are measured during the temperature measurement process. The selection between those voltages is controlled in the Analog Control register (ADC_ACR). V_TEMP is proportional to the absolute temperature voltage (also known as “PTAT voltage”), and V_BG is a reference voltage with a very low temperature dependence.