STM32WL33C8 datasheet(29/91 Pages) STMICROELECTRONICS

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3.24

Analog digital converter (ADC)

The STM32WL33xx SOC embeds a 12-bit ADC. The ADC consists in a 12-bit successive approximation analog-

to-digital converter (SAR) with 2 x 8 multiplexed channels allowing measurements of up to eight external sources

and up to three internal sources.

The main ADC features are:

•

Conversion frequency is up to 1 Msample/s

•

Three input voltage ranges are supported (0 to 1.2 V, 0 to 2.4 V, 0 to 3.6 V)

•

Up to eight analog single ended channels or four analog differential inputs or a mix of both.

•

Temperature sensor conversion.

•

Battery level conversion up to 3.6 V

•

ADC mode conversion only available, programmable in continuous or single mode

•

ADC Down Sampler for multi-purpose applications to improve analog performance while off-loading the

CPU (ratio adjustable from 1 to 128)

•

A watchdog feature to inform when data is outside thresholds

•

DMA capability

•

Interrupt sources with flags

3.24.1

Temperature sensor

The temperature sensor can be used to measure the junction temperature (Tj) of the device. The temperature

sensor is internally connected to the ADC input channels which are used to convert the sensor output voltage to a

digital value. To improve the accuracy of the temperature sensor measurement, each device is individually

factory-calibrated by ST. The temperature sensor factory calibration data are stored by ST in the system memory

area, accessible in read-only mode.

3.25

Analog comparator (COMP)

The STM32WL33xx output embeds one ultra-low power analog comparator COMP.

The comparator can be used for a variety of functions including:

•

Wake-up from low-power mode triggered by an analog signal

•

Analog signal conditioning

•

Cycle-by-cycle current control loop when combined with a PWM output from a timer

•

The comparator has configurable plus and minus inputs used for flexible voltage selection:

–

multiplexed I/O pins

–

internal reference voltage and three submultiple values (1/4, 1/2, 3/4) provided by scaler (buffered

voltage divider)

–

DAC output

•

Programmable hysteresis

•

Programmable speed / consumption

•

The outputs can be redirected to an I/O or to timer inputs for triggering:

–

break events for fast PWM shutdown

–

cycle-by-cycle current control, using OCREF_CLR_INT through ETR inputs

–

capture events

•

Comparator output with blanking source

•

The comparator has interrupt generation capability with wake-up from Sleep and Deepstop modes (through

the PWR controller).

STM32WL33xx

Functional overview

DS14221 - Rev 5

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