Temperature Sensor And Internal Reference Voltage; Figure 37. Temperature Sensor And Vrefint Channel Block Diagram - STMicroelectronics STM32F05 series Reference Manual

RM0091
12.9

Temperature sensor and internal reference voltage

The temperature sensor can be used to measure the junction temperature (T
device. The temperature sensor is internally connected to the ADC1_IN16 input channel
which is used to convert the sensor's output voltage to a digital value. The sampling time for
the temperature sensor's analog pin must be greater than 2.2 µs.
The internal voltage reference (V
ADC and Comparators. V
precise voltage of V
test and stored in the system memory area. It is accessible in read-only mode.
Figure 37
When not in use, the sensor can be put in power down mode.
Note: The TSVREFE bit must be set to enable the conversion of both internal channels:
ADC1_IN16 (temperature sensor) and ADC1_IN17 (V
The temperature sensor output voltage changes linearly with temperature. The offset of this
line varies from chip to chip due to process variation (up to 45 °C from one chip to another).
The internal temperature sensor is more suited for applications that detect temperature
variations instead of absolute temperatures. If accurate temperature readings are needed,
an external temperature sensor part should be used.
During the manufacturing process, the calibration data of the temperature sensor and the
internal voltage reference are stored in the system memory area. The user application can
then read them and use them to improve the accuracy of the temperature sensor or the
internal reference. Refer to the datasheet for additional information.
Main features
●
Supported temperature range: –40 to 125 °C
● Linearity: ±2 °C max. , precision depending on calibration
Figure 37. Temperature sensor and V
REFINT
is individually measured for each part by ST during production
REFINT
shows the block diagram of the temperature sensor.
TSEN control bit
Temperature
sensor
Internal
power
block
VREFEN control bit
Doc ID 018940 Rev 1
) provides a stable (bandgap) voltage output for the
REFINT
is internally connected to the ADC_IN17 input channel. The
channel block diagram
REFINT
V
SENSE
ADC1_IN16
V
REFINT
ADC1_IN17
Analog-to-digital converter (ADC)
).
REFINT
converted data
ADC1
) of the
J
ai16065
189/742