STM32WL33C8 datasheet(30/91 Pages) STMICROELECTRONICS

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3.26

Digital to analog converter (DAC)

The STM32WL33xx embeds one ultra-low power 6-bit DAC module. The DAC may be used in conjunction with

the DMA controller.

The DAC has three output channels:

•

DACOUT_GPIO connected to GPIO PA13

•

DACOUT_VCMBUF connected to VCMBUFF

•

DACOUT_COMPMINUS connected to COMP MINUS input

Main DAC features:

•

Synchronized update capability

•

Noise-wave generation

•

Triangular-wave generation

•

DMA capability

•

DMA underrun error detection and interrupt generation

•

External triggers (GPIO, TIM16) for conversion

•

Input voltage reference

3.27

LC sensor controller (LCSC)

The LC sensor controller controls DAC, COMP power-on/power-off and dedicated GPIOs (PB1, PA14, PB2) for

the measurement of LC networks damping times. The LC damping time measurements are used in fluid (typically

water) metering applications.

In this kind of application, the flow of a fluid in a pipe forces the rotation of a wheel, whose number of revolutions

permits to quantify the amount of consumed fluid. Three external LC networks, positioned on top of the wheel,

permit the counting of the revolutions. These networks are to be connected to identified GPIOs. Two of them allow

to find the position of the rotating wheel, whereas the other one is necessary to avoid tamper.

LC sensor controller main features:

•

Manage the sequence of measurement of the 3 LC available networks (LCA, LCB, LCT)

•

Manages the power-on/power-off of COMP, DAC

•

Count the number of comparator (COMP) output edges for each LC to determine the wheel position or if

there is any tamper

•

Count the number of wheel revolutions (a full revolution means that the wheel has started rotating from a

defined initial position up to returning to this position)

•

Wakeup from low-power modes (WFI or Deepstop) and notify the system through an interrupt when the

total number of wheel revolutions reaches a given threshold fixed by the application user.

3.28

Debug support (DBG)

The STM32WL33xx embeds an Arm serial wire debug (SWD) interface that enables interactive debugging and

programming of the device. The interface is composed of only two pins: SWDIO and SWCLK. The enhanced

debugging features for developers allow up to 4 breakpoints and up to 2 watchpoints.

STM32WL33xx

Functional overview

DS14221 - Rev 5

page 30/91

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