STM32F302X8 datasheet(20/138 Pages) STMICROELECTRONICS

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Functional overview

STM32F302x6 STM32F302x8

20/138

DocID025147 Rev 6

3.11

Fast analog-to-digital converter (ADC)

An analog-to-digital converter, with selectable resolution between 12 and 6 bit, is embedded

in the STM32F302x6/8 family devices. The ADC has up to 15 external channels performing

conversions in single-shot or scan modes. Channels can be configured to be either single-

ended input or differential input. In scan mode, automatic conversion is performed on a

selected group of analog inputs.

Additional logic functions embedded in the ADC interface allow:

•

Simultaneous sample and hold

•

Single-shunt phase current reading techniques.

The ADC can be served by the DMA controller.

Three analog watchdogs are available. The 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 general-purpose timers (TIMx) and the advanced-control timer

(TIM1) can be internally connected to the ADC start trigger and injection trigger,

respectively, to allow the application to synchronize A/D conversion and timers.

3.11.1

Temperature sensor

The temperature sensor (TS) generates a voltage VSENSE that varies linearly with

temperature.

The temperature sensor is internally connected to the ADC1_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.

3.11.2

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 ADC1_IN18 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.

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