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DFSDM Introduction • External SD modulators on market: • This is external standalone device: ADC converter on sigma delta principle • Analog input (usually differential) and digital output • Precision: ~16-bit resolution • Provides digital output as fast 1-bit data stream => serial interface • Up to 20MHz speed of serial data • Wide range of suppliers (ST, TI, Analog Devices) • STM32 interface: DFSDM = Digital Filter for Sigma Delta Modulators Implements complete post-processing from external SD modulators outputs: • Receiving of data streams from SD modulators (in various serial data formats) • Digital filtering of data stream (final 24-bit result) • Security/emergency functions 100
