STM32F303VC datasheet(20/148 Pages) STMICROELECTRONICS

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Functional overview

STM32F303xB STM32F303xC

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DocID023353 Rev 13

3.13

Fast analog-to-digital converter (ADC)

four fast analog-to-digital converters 5 MSPS, with selectable resolution between 12 and 6

bit, are embedded in the STM32F303xB/STM32F303xC family devices. The ADCs have up

to 39 external channels. Some of the external channels are shared between ADC1&2 and

between ADC3&4. Channels can be configured to be either single-ended input or differential

input. The ADCs can perform 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, VREFOPAMP3 connected to ADC3 channel 17 and VREFOPAMP4

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. 3 analog watchdogs per ADC are available.

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 and TIM8) can be internally connected to the ADC start trigger and injection trigger,

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

3.13.1

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.

3.13.2

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 ADCx_IN18, x=1...4 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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