STM32 Development Log 6 : ADC sampling

 

ADC	IC	Channels
ADC1	ADS7606 (U9)	AN0–AN7
ADC2	ADS7606 (U10)	AN8–AN15

All 8 channels on each ADS7606 are sampled simultaneously ADC 1  No MOSI SPI3_CLK SPI3_MISO ADC_CS1 ADC1_CONV_ST ADC1_BUSY ADC1_RESET  ADC 2 No MOSI SPI3_CLK SPI3_MISO ADC_CS2 ADC2_CONV_ST ADC2_BUSY ADC2_RESET  GPIO lines Signal STM32 Pin ADC1_CONV_ST PF15 ADC2_CONV_ST PK7 ADC1_RESET PJ2 ADC2_RESET PK4 ADC1_BUSY PB5 ADC2_BUSY PB6 SPI3_CLK PA7 SPI3_MISO PF11 ADC_CS1 PG15 ADC_CS2 PB8   Low pass filter R = 100 Ω C = 0.1 µF Cutoff: $$f_c=\frac{1}{2\pi RC}$$ $$f_c=\frac{1}{2\pi (100)(0.1\times10^{-6})}$$ $$f_c\approx 15.9\,kHz$$ So the board contains approximately: 16 kHz low-pass anti-alias filter