STM32F372CB datasheet(17/128 Pages) STMICROELECTRONICS

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STM32F37x

Functional overview

Doc ID 022691 Rev 3

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3.12

12-bit analog-to-digital converter (ADC)

The 12-bit analog-to-digital converter is based on a successive approximation register

(SAR) architecture. It has up to 16 external channels (AIN15:0) and 3 internal channels

(temperature sensor, voltage reference, VBAT voltage measurement) performing

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.

The events generated by the timers (TIMx) can be internally connected to the ADC start and

injection trigger, respectively, to allow the application to synchronize A/D conversion and

timers.

3.12.1

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. See Table 65:

Temperature sensor calibration values on page 103.

3.12.2

Internal voltage reference (VREFINT)

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

ADC and Comparators. 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.

3.12.3

VBAT battery voltage monitoring

This embedded hardware feature allows the application to measure the VBAT battery voltage

using the internal ADC channel ADC_IN18. As the VBAT voltage may be higher than VDDA,

and thus outside the ADC input range, the VBAT pin is internally connected to a divider by 2.

As a consequence, the converted digital value is half the VBAT voltage.

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