Analog To Digital Converter (Adc); Temperature Sensor; Internal Voltage Reference; Refint ) - STMicroelectronics STM32F050G6 Manual

STM32F050xx
3.10

Analog to digital converter (ADC)

The 12-bit analog to digital converter has up to 16 external and 3 internal (temperature
sensor, voltage reference, VBAT voltage measurement) channels and performs conversions
in single-shot or scan modes. In scan mode, automatic conversion is performed on a
selected group of analog inputs.
The ADC can be served by the DMA controller.
An analog watchdog feature allows very precise monitoring of the converted voltage of one,
some or all selected channels. An interrupt is generated when the converted voltage is
outside the programmed thresholds.
3.10.1

Temperature sensor

The temperature sensor (TS) generates a voltage V
temperature.
The temperature sensor is internally connected to the ADC_IN16 input channel which is
used to convert the sensor output voltage into a digital value.
The sensor provides good linearity but it has to be calibrated to obtain good overall accuracy
of the temperature measurement. As the offset of the temperature sensor varies from chip
to chip due to process variation, the uncalibrated internal temperature sensor is suitable for
applications that detect temperature changes only.
To improve the accuracy of the temperature sensor measurement, each device is
individually factory-calibrated by ST. The temperature sensor factory calibration data are
stored by ST in the system memory area, accessible in read-only mode.
Table 3.
Calibration value name
TS_CAL1
TS_CAL2
3.10.2 Internal voltage reference (V
The internal voltage reference (V
ADC. V
REFINT
of V
REFINT
the system memory area. It is accessible in read-only mode.
Table 4.
Calibration value name
VREFINT_CAL
Temperature sensor calibration values
TS ADC raw data acquired at
temperature of 30 °C,
V
DDA
TS ADC raw data acquired at
temperature of 110 °C
V
DDA
REFINT
is internally connected to the ADC_IN17 input channel. The precise voltage
is individually measured for each part by ST during production test and stored in
Temperature sensor calibration values
Raw data acquired at
temperature of 30 °C
V
DDA
Doc ID 023079 Rev 3
SENSE
Description
= 3.3 V
= 3.3 V
)
REFINT
) provides a stable (bandgap) voltage output for the
Description
= 3.3 V
Functional overview
that varies linearly with
Memory address
0x1FFF F7B8 - 0x1FFF F7B9
0x1FFF F7C2 - 0x1FFF F7C3
Memory address
0x1FFF F7BA - 0x1FFF F7BB
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