STM32U595AI datasheet(71/377 Pages) STMICROELECTRONICS

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DS13633 Rev 1

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STM32U59xxx

Functional overview

3.36.1

Multi-function digital filter (MDF)

The MDF is a high-performance module dedicated to the connection of external sigma-delta

(Σ∆) modulators. It is mainly targeted for the following applications:

•

audio capture signals

•

motor control

•

metering

The MDF features six digital serial interfaces (SITFx) and digital filters (DFLTx) with flexible

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

The DFLTx of the MDF also include the filters of the ADF (audio digital filter).

The MDF can receive, via its serial interfaces, streams coming from various digital sensors.

The MDF supports the following standards allowing the connection of various

ΣΔ modulator

sensors:

•

SPI interface

•

Manchester coded 1-wire interface

•

PDM interface

A flexible BSMX (bitstream matrix) allows the connection of any incoming bitstream to any

filter.

The MDF 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 DC offset correction block.

The conversion speed and resolution are adjustable according to configurable parameters

for digital processing: filter type, filter order, decimation ratio, integrator length. 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 flexible trigger interface can be used to control the conversion start. This timing control

can trigger simultaneous conversions or insert a programmable delay between conversions.

The MDF features an OLD (out-off limit detectors) function. There is one OLD for each

digital filter chain. Independent programmable thresholds are available for each OLD,

making it very suitable for over-current detection.

A SCD (short circuit detector) is also available for every selected bitstream. The SCD is able

to detect a short-circuit condition with a very short latency. Independent programmable

thresholds are offered in order to define the short circuit condition.

All the digital processing is performed using only the kernel clock. The MDF 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 MDF main features are:

•

AHB interface

•

Six serial digital inputs:

–

configurable SPI interface to connect various digital sensors

–

configurable Manchester coded interface support

–

compatible with PDM interface to support digital microphones

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