STM32F303X6 datasheet(21/124 Pages) STMICROELECTRONICS

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DS9866 Rev 8

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STM32F303x6/x8

Functional overview

independently. A pending register maintains the status of the interrupt requests. The EXTI

can detect an external line with a pulse width shorter than the internal clock period. Up to 51

GPIOs can be connected to the 16 external interrupt lines.

3.10

Fast analog-to-digital converter (ADC)

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

bit, are embedded in the STM32F303x6/8 family devices. The ADCs have up to 21 external

channels. Some of the external channels are shared between ADC1 and ADC2, performing

conversions in single-shot or scan modes. The 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.

The ADCs also have internal channels: temperature sensor connected to ADC1 channel 16,

VBAT/2 connected to ADC1 channel 17, voltage reference VREFINT connected to both ADC1

and ADC2 channel 18 and VOPAMP2 connected to ADC2 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.

Three analog watchdogs are available per ADC. The ADC can be served by the DMA

controller.

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 (TIM2, TIM3, TIM6, TIM15) 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.

3.10.1

Temperature sensor

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

temperature.

The temperature sensor is internally connected to the ADC1_IN16 input channel that 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 and Comparators. VREFINT is internally connected to the ADC1_IN18 and ADC2_IN18

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