ADC میکروی STM32f103 می تونه مقدار منفی بخونه؟

[mohsen p]

ADC میکروی STM32f103 می تونه مقدار منفی بخونه؟(ورودی ADC چند تا چنده)

[ElectronAzad]

پاسخ : ADC میکروی STM32f103 می تونه مقدار منفی بخونه؟

بله میتونه بخونه. مشخصه یکی مونده به آخر رو نگاه کنید:

ADC main features
● 12-bit resolution
● Interrupt generation at End of Conversion, End of Injected conversion and Analog
watchdog event
● Single and continuous conversion modes
● Scan mode for automatic conversion of channel 0 to channel ‘n’
● Self-calibration
● Data alignment with in-built data coherency
● Channel by channel programmable sampling time
● External trigger option for both regular and injected conversion
● Discontinuous mode
● Dual mode (on devices with 2 ADCs or more)
● ADC conversion time:
– STM32F103xx performance line devices: 1 μs at 56 MHz (1.17 μs at 72 MHz)
– STM32F101xx access line devices: 1 μs at 28 MHz (1.55 μs at 36 MHz)
– STM32F102xx USB access line devices: 1.2 μs at 48 MHz
– STM32F105xx and STM32F107xx devices: 1 μs at 56 MHz (1.17 μs at 72 MHz)
● ADC supply requirement: 2.4 V to 3.6 V
● ADC input range: VREF- ≤ VIN ≤ VREF+
● DMA request generation during regular channel conversion

[mohsen p]

پاسخ : ADC میکروی STM32f103 می تونه مقدار منفی بخونه؟

نمی تونه بخونه ، درسته که گفته -Vref اما درون دیتا شیت گفته که -Vref بایستی به زمین وصل بشه.
درون دیتا شیت گفته:
The lower/negative reference voltage for the ADC,VREF- = VSSA
و
Ground for analog power supply equal to VSS
صفحه 209 دیتا شیت STM32F103RE