STM32F050C6T6A datasheet(17/97 Pages) STMICROELECTRONICS

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STM32F050xx

Functional overview

Doc ID 023683 Rev 1

17/97

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 VSENSE that varies linearly with

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.

3.10.2

Internal voltage reference (VREFINT)

The internal voltage reference (VREFINT) provides a stable (bandgap) voltage output for the

ADC. VREFINT is internally connected to the ADC_IN17 input channel. The precise voltage

of VREFINT is individually measured for each part by ST during production test and stored in

the system memory area. It is accessible in read-only mode.

Table 3.

Temperature sensor calibration values

Calibration value name

Description

Memory address

TS_CAL1

TS ADC raw data acquired at

temperature of 30 °C,

VDDA= 3.3 V

0x1FFF F7B8 - 0x1FFF F7B9

TS_CAL2

TS ADC raw data acquired at

temperature of 110 °C

VDDA= 3.3 V

0x1FFF F7C2 - 0x1FFF F7C3

Table 4.

Temperature sensor calibration values

Calibration value name

Description

Memory address

VREFINT_CAL

Raw data acquired at

temperature of 30 °C

VDDA= 3.3 V

0x1FFF F7BA - 0x1FFF F7BB

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