STM32U535NET3QTR datasheet(65/278 Pages) STMICROELECTRONICS

65 / 278 page

DS14217 Rev 1

65/278

STM32U535xx

Functional overview

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An offset error cancellation

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Gain control

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Saturation blocks

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An out-off limit detector

•

Short-circuit detector

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Clock absence detector

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16- or 24-bit signed output data resolution

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Continuous or single conversion

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Possibility to delay independently each bitstream

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Various trigger possibilities

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Break generation on out-of limit or short-circuit detector events

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Autonomous functionality in Stop modes

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DMA can be used to read the conversion data

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Interrupts services

3.30.2

Audio digital filter (ADF)

The ADF is a high-performance module dedicated to the connection of external Σ∆

modulators. It is mainly targeted for the following applications:

•

audio capture signals

•

metering

The ADF features one digital serial interface (SITF0) and one digital filter (DFLT0) with

flexible digital processing options to offer up to 24-bit final resolution.

The DLFT0 of the ADF is a subset of the digital filters included into the MDF.

The ADF serial interface supports several standards allowing the connection of various Σ∆

modulator sensors:

•

SPI interface

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Manchester coded 1-wire interface

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PDM interface

A flexible BSMX allows the connection of any incoming bitstream to any filter.

The ADF converts an input data stream into clean decimated digital data words. This

conversion is done thanks to low-pass digital filters and decimation blocks. In addition it is

possible to insert a high-pass filter or a DC offset correction block.

The conversion speed and resolution are adjustable according to configurable parameters

for digital processing: filter type, filter order, decimation ratio. The maximum output data

resolution is up to 24 bits. There are two conversion modes: single conversion and

continuous modes. The data can be automatically stored in a system RAM buffer through

DMA, thus reducing the software overhead.

A SAD (sound activity detector) is available for the detection of “speech-like” signals. The

SAD is connected at the output of DFLT0. Several parameters can be programmed to adjust

properly the SAD to the sound environment. The SAD can strongly reduce the power

consumption by preventing the storage of samples into the system memory as long as the

observed signal does not match the programmed criteria.

A flexible trigger interface can be used to control the start of conversion of the ADF.

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