STM32F303VC datasheet(20/133 Pages) STMICROELECTRONICS

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Functional overview

STM32F302xx/STM32F303xx

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Doc ID 023353 Rev 5

3.12

Fast analog-to-digital converter (ADC)

Up to four fast analog-to-digital converters 5 MSPS, with selectable resolution between 12

and 6 bit, are embedded in the STM32F302xx/STM32F303xx family devices. The ADCs

have up to 39 external channels. Some of the external channels are shared between

ADC1&2 and between ADC3&4, performing conversions in single-shot or scan modes. In

scan mode, automatic conversion is performed on a selected group of analog inputs.

The ADCs have also internal channels: Temperature sensor connected to ADC1 channel

16, VBAT/2 connected to ADC1 channel 17, Voltage reference VREFINT connected to the 4

ADCs channel 18, VOPAMP1 connected to ADC1 channel 15, VOPAMP2 connected to

ADC2 channel 17, VOPAMP3 connected to ADC3 channel 17, VOPAMP4 connected to

ADC4 channel 17.

Additional logic functions embedded in the ADC interface allow:

●

Simultaneous sample and hold

●

Interleaved sample and hold

●

Single-shunt phase current reading techniques.

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 general-purpose timers and the advanced-control timers (TIM1

on all devices and TIM8 on STM32F303xB/STM32F303xC devices) can be internally

connected to the ADC start trigger and injection trigger, respectively, to allow the application

to synchronize A/D conversion and timers.

3.12.1

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.

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_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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