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STM32F427XX Datasheet(PDF) 42 Page - STMicroelectronics |
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STM32F427XX Datasheet(HTML) 42 Page - STMicroelectronics |
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42 / 239 page  Functional overview STM32F427xx STM32F429xx 42/238 DocID024030 Rev 9 3.39 Temperature sensor The temperature sensor has to generate a voltage that varies linearly with temperature. The conversion range is between 1.7 V and 3.6 V. The temperature sensor is internally connected to the same input channel as VBAT, ADC1_IN18, which is used to convert the sensor output voltage into a digital value. When the temperature sensor and VBAT conversion are enabled at the same time, only VBAT conversion is performed. As the offset of the temperature sensor varies from chip to chip due to process variation, the internal temperature sensor is mainly suitable for applications that detect temperature changes instead of absolute temperatures. If an accurate temperature reading is needed, then an external temperature sensor part should be used. 3.40 Digital-to-analog converter (DAC) The two 12-bit buffered DAC channels can be used to convert two digital signals into two analog voltage signal outputs. This dual digital Interface supports the following features: • two DAC converters: one for each output channel • 8-bit or 10-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. 3.41 Serial wire JTAG debug port (SWJ-DP) The ARM SWJ-DP interface is embedded, and is a combined JTAG and serial wire debug port that enables either a serial wire debug or a JTAG probe to be connected to the target. Debug is performed using 2 pins only instead of 5 required by the JTAG (JTAG pins could be re-use as GPIO with alternate function): the JTAG TMS and TCK pins are shared with SWDIO and SWCLK, respectively, and a specific sequence on the TMS pin is used to switch between JTAG-DP and SW-DP. |
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