STM32U545NET3QTR datasheet(58/283 Pages) STMICROELECTRONICS

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Functional overview

STM32U545xx

58/283

DS14216 Rev 1

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ADC features an external analog input channel:

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Up to 17 channels from dedicated GPIO pads

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Three additional internal dedicated channels:

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One channel for internal reference voltage (VREFINT)

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One channel for internal temperature sensor (VSENSE)

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One channel for VBAT monitoring channel (VBAT/4)

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Start-of-conversion can be initiated:

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by software for both regular and injected conversions

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by hardware triggers with configurable polarity (internal timers events or GPIO

input events) for both regular and injected conversions

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Conversion modes

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Single mode: the ADC converts a single channel. The conversion is triggered by

a special event.

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Scan mode: the ADC scans and converts a sequence of channels.

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Continuous mode: the ADC converts continuously selected inputs.

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Discontinuous mode: the ADC converts a subset of the conversion sequence.

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Interrupt generation when the ADC is ready, at end of sampling, end of conversion

(regular or injected), end of sequence conversion (regular or injected), analog

watchdog 1, 2 or 3 or when an overrun event occurs

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Three analog watchdogs

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Filtering to ignore out-of-range data

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ADC input range: VSSA < VIN < VREF+

Note:

The ADC1 analog block clock frequency must be between 5 MHz and 55 MHz.

3.25.2

Analog-to-digital converter 4 (ADC4)

The 12-bit ADC4 is a successive approximation analog-to-digital converter. It has up to

21 multiplexed channels allowing it to measure signals from 15 external and six internal

sources. A/D conversion of the various channels can be performed in Single, Continuous,

Scan or Discontinuous mode. The result of the ADC is stored in a left-aligned or

right-aligned 16-bit data register.

The analog watchdog feature allows the application to detect if the input voltage goes

outside the user-defined higher or lower thresholds.

An efficient low-power mode is implemented to allow very low consumption at low

frequency. The ADC4 is autonomous in low-power modes down to Stop 2 mode.

A built-in hardware oversampler allows analog performances to be improved while

off-loading the related computational burden from the CPU.

The ADC4 main features are:

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High performance

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12-, 10-, 8- or 6-bit configurable resolution

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A/D conversion time: 0.4 µs for 12-bit resolution (2.5 MHz), faster conversion

times obtained by lowering resolution

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Self-calibration

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Programmable sampling time

STM32U545NET3QTR Datasheet(PDF) 58 Page - STMicroelectronics

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