STM32MP151A_V01 datasheet(39/245 Pages) STMICROELECTRONICS

39 / 245 page

DS12500 Rev 1

39/245

STM32MP151A

Functional overview

The DFSDM peripheral supports:

•

8 multiplexed input digital serial channels:

–

configurable SPI interface to connect various SD modulator(s)

–

configurable Manchester coded 1-wire interface support

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PDM (pulse density modulation) microphone input support

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maximum input clock frequency up to 20 MHz (10 MHz for Manchester coding)

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clock output for SD modulator(s): 0…20 MHz

•

Alternative inputs from 8 internal digital parallel channels (up to 16-bit input resolution):

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internal sources: ADC data or memory data streams (DMA)

•

6 digital filter modules with adjustable digital signal processing:

–Sincx filter: filter order/type (1…5), oversampling ratio (1…1024)

–

integrator: oversampling ratio (1…256)

•

Up to 24-bit output data resolution, signed output data format

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Automatic data offset correction (offset stored in register by user)

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Continuous or single conversion

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Start-of-conversion triggered by:

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software trigger

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internal timers

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external events

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start-of-conversion synchronously with first digital filter module (DFSDM0)

•

Analog watchdog feature:

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low value and high value data threshold registers

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dedicated configurable Sincx digital filter (order = 1…3, oversampling ratio =

1…32)

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input from final output data or from selected input digital serial channels

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continuous monitoring independently from standard conversion

•

Short circuit detector to detect saturated analog input values (bottom and top range):

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up to 8-bit counter to detect 1…256 consecutive 0’s or 1’s on serial data stream

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monitoring continuously each input serial channel

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Break signal generation on analog watchdog event or on short circuit detector event

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Extremes detector:

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storage of minimum and maximum values of final conversion data

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refreshed by software

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DMA capability to read the final conversion data

•

Interrupts: end of conversion, overrun, analog watchdog, short circuit, input serial

channel clock absence

•

“Regular” 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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