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STM32F205 Datasheet(PDF) 32 Page - STMicroelectronics |
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STM32F205 Datasheet(HTML) 32 Page - STMicroelectronics |
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32 / 163 page  Description STM32F205xx, STM32F207xx 32/163 Doc ID 15818 Rev 7 alternate functions. All GPIOs are high-current-capable and have speed selection to better manage internal noise, power consumption and electromagnetic emission. The I/O alternate function configuration can be locked if needed by following a specific sequence in order to avoid spurious writing to the I/Os registers. To provide fast I/O handling, the GPIOs are on the fast AHB1 bus with a clock up to 120 MHz that leads to a maximum I/O toggling speed of 60 MHz. 2.2.38 ADCs (analog-to-digital converters) Three 12-bit analog-to-digital converters are embedded and each ADC shares up to 16 external channels, performing conversions in the single-shot or scan mode. 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 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 timers TIM1, TIM2, TIM3, TIM4, TIM5 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. 2.2.39 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 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 ● left or right data alignment in 12-bit mode ● synchronized update capability ● noise-wave generation ● triangular-wave generation ● dual DAC channel independent or simultaneous conversions ● DMA capability for each channel ● external triggers for conversion ● input voltage reference VREF+ Eight DAC trigger inputs are used in the device. The DAC channels are triggered through the timer update outputs that are also connected to different DMA streams. 2.2.40 Temperature sensor The temperature sensor has to generate a voltage that varies linearly with temperature. The conversion range is between 1.8 and 3.6 V. The temperature sensor is internally connected |
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