STM32L552CCT3PTR datasheet(64/340 Pages) STMICROELECTRONICS

64 / 340 page

Functional overview

STM32L552xx

64/340

DS12737 Rev 6

3.24

Comparators (COMP)

The devices embed two rail-to-rail comparators with programmable reference voltage

(internal or external), hysteresis and speed (low speed for low-power) and with selectable

output polarity.

The reference voltage can be one of the following:

•

External I/O

•

DAC output channels

•

Internal reference voltage or submultiple (1/4, 1/2, 3/4).

All comparators can wake up from Stop mode, generate interrupts and breaks for the timers

and can also be combined into a window comparator.

3.25

Operational amplifier (OPAMP)

The devices embed two operational amplifiers with external or internal follower routing and

PGA capability.

The operational amplifier features:

•

Low input bias current

•

Low offset voltage

•

Low-power mode

•

Rail-to-rail input

3.26

Digital filter for sigma-delta modulators (DFSDM)

The devices embed one DFSDM with four digital filters modules and eight external input

serial channels (transceivers) or alternately eight internal parallel inputs support.

The DFSDM peripheral is dedicated to interface the external Σ∆ modulators to the

microcontroller and then to perform digital filtering of the received data streams (which

represent analog value on Σ∆ modulators inputs).

The DFSDM can also interface the PDM (pulse density modulation) microphones and

perform PDM to PCM conversion and filtering in hardware. The DFSDM features optional

parallel data stream inputs from microcontrollers memory (through DMA/CPU transfers into

DFSDM).

The DFSDM transceivers support several serial interface formats (to support various Σ∆

modulators) and the DFSDM digital filter modules perform digital processing according to

the user’s selected filter parameters with up to 24-bit final ADC resolution.

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