STM32F103RG datasheet(23/120 Pages) STMICROELECTRONICS

23 / 120 page

STM32F103xF, STM32F103xG

Description

Doc ID 16554 Rev 3

23/120

The I/Os alternate function configuration can be locked if needed following a specific

sequence in order to avoid spurious writing to the I/Os registers.

2.3.27

ADC (analog to digital converter)

Three 12-bit analog-to-digital converters are embedded into STM32F103xF and

STM32F103xG performance line devices and each ADC shares up to 21 external channels,

performing conversions in single-shot or scan modes. 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

●

Interleaved sample and hold

●

Single shunt

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 (TIMx) 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.

2.3.28

DAC (digital-to-analog converter)

The two 12-bit buffered DAC channels can be used to convert two digital signals into two

analog voltage signal outputs. The chosen design structure is composed of integrated

resistor strings and an amplifier in inverting configuration.

This dual digital Interface supports the following features:

●

two DAC converters: one for each output channel

●

8-bit or 12-bit monotonic output

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left or right data alignment in 12-bit mode

●

synchronized update capability

●

noise-wave generation

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triangular-wave generation

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dual DAC channel independent or simultaneous conversions

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DMA capability for each channel

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external triggers for conversion

●

input voltage reference VREF+

Eight DAC trigger inputs are used in the STM32F103xF and STM32F103xG performance

line family. The DAC channels are triggered through the timer update outputs that are also

connected to different DMA channels.

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