Datasheet

DocID028087 Rev 4 39/193
STM32F412xE/G Functional overview
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The DFSDM peripheral supports:
• 4 multiplexed input digital serial channels:
– configurable SPI interface to connect various SD modulator(s)
– configurable Manchester coded 1 wire interface support
– PDM (Pulse Density Modulation) microphone input support
– maximum input clock frequency up to 20 MHz (10 MHz for Manchester coding)
– clock output for SD modulator(s): 0...20 MHz
• alternative inputs from 4 internal digital parallel channels (up to 16 bit input resolution):
– internal sources: device memory data streams (DMA)
• 2 digital filter modules with adjustable digital signal processing:
–Sinc
x
filter: filter order/type (1...5), oversampling ratio (up to 1...1024)
– integrator: oversampling ratio (1...256)
• up to 24-bit output data resolution, signed output data format
• automatic data offset correction (offset stored in register by user)
• continuous or single conversion
• start-of-conversion triggered by
– software trigger
– internal timers
– external events
– start-of-conversion synchronously with first digital filter module (DFSDM1FLT0)
• analog watchdog feature:
– low value and high value data threshold registers
– dedicated configurable Sinc
x
digital filter (order = 1...3, oversampling ratio = 1...32
– input from digital output data or from selected input digital serial channels
– continuous monitoring independently from standard conversion
• short circuit detector to detect saturated analog input values (bottom and top range):
– up to 8-bit counter to detect 1...256 consecutive 0’s or 1’s on serial data stream
– monitoring continuously each input serial channel
• break signal generation on analog watchdog event or on short circuit detector event
• extremes detector:
– storage of minimum and maximum values of final conversion data
– refreshed by software
• DMA capability to read the final conversion data
• interrupts: end of conversion, overrun, analog watchdog, short circuit input serial
channel clock absence
• “regulator” or injected” conversions:
– “regular” conversions can be requested at any time or even in continuous mode
without having any impact on the timing of “injected” conversions
– “injected” conversions for precise timing and with high conversion priority.
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