STM32U535NET3QTR datasheet(64/278 Pages) STMICROELECTRONICS

64 / 278 page

Functional overview

STM32U535xx

64/278

DS14217 Rev 1

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

•

Two serial digital inputs:

–

configurable SPI interface to connect various digital sensors

–

configurable Manchester coded interface support

–

compatible with PDM interface to support digital microphones

•

Two common clock input/output for Σ∆ modulators

•

Flexible BSMX for connection between filters and digital inputs

•

Two inputs to connect the internal ADCs

•

Two flexible digital filter paths, including:

–

A configurable CIC filter:

- Can be split into two CIC filters: high-resolution filter and out-off limit detector

- 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

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