STM32U5A5QJ datasheet(74/382 Pages) STMICROELECTRONICS

74 / 382 page

Functional overview

STM32U5Axxx

74/382

DS13543 Rev 1

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.

All the digital processing is performed using only the kernel clock. The ADF requests the bus

interface clock (AHB clock) only when data must be transfered or when a specific event

requests the attention of the system processor.

The ADF main features are:

•

AHB interface

•

One serial digital input:

–

Configurable SPI interface to connect various digital sensors

–

Configurable Manchester coded interface support

–

Compatible with PDM interface to support digital microphones

•

Two common clocks input/output for Σ∆ modulators

•

Flexible BSMX for connection between filters and digital inputs

•

One flexible digital filter path, including:

–

A configurable CIC filter:

- Can be configured in Sinc4 filter

- Can be configured in Sinc5 filter

- Adjustable decimation ratio

–

A reshape filter to improve the out-off band rejection and in-band ripple

–

A high-pass filter to cancel the DC offset

–

Gain control

–

Saturation blocks

•

Clock absence detector

•

Sound activity detector

•

16- or 24-bit signed output data resolution

•

Continuous or single conversion

•

Possibility to delay independently each bitstream

•

Various trigger possibilities

•

Autonomous mode in Stop 0, Stop 1 and Stop 2 modes

•

Wake-up from Stop with all interrupts

•

DMA can be used to read the conversion data

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