STM32MP251C datasheet(29/241 Pages) STMICROELECTRONICS

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3.27

Analog-to-digital converters (ADC1/2/3)

STM32MP25xC/F devices embed three analog-to-digital converters, which resolution can be configured to 12, 10,

or 8 bits. Each ADC shares up to 20 channels, performing conversions in single-shot or scan mode. In scan

mode, an automatic conversion is performed on a selected group of analog inputs.

Additional logic functions embedded in the ADC interface allow:

•

simultaneous ADC1/ADC2 conversion

•

interleaved ADC1/ADC2 conversion

The ADC can be served by DMA, thus allows the automatic transfer of ADC converted values to a destination

location without any software action.

In addition, an analog watchdog feature can accurately monitor the converted voltage of one, some, or all

selected channels. An interrupt is generated when the converted voltage is outside the programmed thresholds.

In order to synchronize A/D conversion, the ADCs can be triggered by timers.

3.28

Digital temperature sensor (DTS)

The DTS is a high-precision low-power junction temperature sensor, based on a configurable controller plus one

or multiple embedded temperature sensors. The sensor can operate in two distinct modes to provide temperature

readings:

•

first mode used to a provide calibrated accurate temperature

•

second mode that does not require any calibration

Main features:

•

Two programmable (rise or fall) hardware alarms incorporating hysteresis

•

Status registers recording the minimum and maximum data values received

•

A power-up timer with IRQ to support manual operation

•

A calibration sequence requiring no knowledge of die temperature.

3.29

VBAT operation

The VSW domain supplies the RTC, the TAMP, the LSI, the LSE, the IWDG5, the backup registers, the LPSRAM1,

the retention RAM, and the backup SRAM.

In order to optimize the battery duration, this power domain is supplied by VDD when available, or by the voltage

applied on VBAT pin (when VDD supply is not present). VBAT power is switched when the PDR detects that VDD

has dropped below the PDR level.

The voltage on VBAT pin can be provided by an external battery, by a supercapacitor, or directly by VDD. In the

later case, VBAT mode is not functional.

VBAT operation is activated when VDD is not present.

Note:

None of these events (external interrupts, watchdog reset, TAMP event, or RTC alarm/events) can directly

restore the VDD supply, and force the device out of the VBAT operation. Nevertheless, watchdog reset (taken as

a tamper event), TAMP events, and RTC alarm/events can be used to generate a signal to an external circuitry

(typically a PMIC) that can restore the VDD supply.

3.30

Voltage reference buffer (VREFBUF)

STM32MP25xC/F devices embed a voltage reference buffer which can be used as voltage reference for ADC,

and as voltage reference for external components through VREF+ pin.

An external voltage reference must be provided through the VREF+ pin when the internal voltage reference buffer

is off.

3.31

Multifunction digital filter (MDF1)

The MDF is a high-performance module dedicated to the connection of external sigma-delta (Σ∆) modulators.

STM32MP251C/F STM32MP253C/F STM32MP255C/F STM32MP257C/F

Functional overview

DS14284 - Rev 3

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