STM32U073RCI3TR datasheet(20/146 Pages) STMICROELECTRONICS

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3.18

Voltage reference buffer (VREFBUF)

When enabled, an embedded buffer provides the internal reference voltage to analog blocks (for example ADC)

and to VREF+ pin for external components.

The internal voltage reference buffer supports two voltages:

•

2.048 V

•

2.5 V

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

is disabled.

On some packages, the VREF+ pad of the silicon die is double-bonded with supply pad to common VDD/VDDA

pin and so the internal voltage reference buffer cannot be used.

3.19

Comparators (COMP)

STM32U073x8/B/C embed two embedded rail-to-rail analog comparators with programmable reference voltage

(internal or external), hysteresis, speed (low for low-power), and output polarity.

The reference voltage can be one of the following:

•

External, from an I/O

•

Internal, from DAC

•

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

The comparators can wake up the device from Stop mode, generate interrupts, breaks or triggers for the timers

and can be also combined into a window comparator.

3.20

Operational amplifier (OPAMP)

The STM32U073x8/B/C devices embed one operational amplifier with external and internal follower routing and

PGA capability.

Features of the operational amplifier:

•

Low input bias current

•

Low offset voltage

•

Low-power mode

•

Rail-to-rail input

3.21

Liquid crystal controller (LCD)

The LCD drives up to eight common terminals and 48 segment terminals to drive up to 352 pixels.

Features of the LCD:

•

Internal step-up converter to guarantee functionality and contrast control irrespective of VDD. This converter

can be deactivated, in which case the VLCD pin is used to provide the voltage to the LCD

•

Supports static, 1/2, 1/3, 1/4 and 1/8 duty

•

Supports static, 1/2, 1/3 and 1/4 bias

•

Phase inversion to reduce power consumption and EMI

•

Up to eight pixels can be programmed to blink

Unneeded segments and common pins can be used as general I/O pins

LCD RAM can be updated at any time owing to a double-buffer

The LCD controller can operate in Stop mode

3.22

Touch sensing controller (TSC)

The touch sensing controller provides a simple solution for adding capacitive sensing functionality to any

application. Capacitive sensing technology is able to detect finger presence near an electrode that is protected

from direct touch by a dielectric (such as glass or plastic). The capacitive variation introduced by the finger (or any

conductive object) is measured using a proven implementation based on a surface charge transfer acquisition

principle.

The touch sensing controller is fully supported by the STMTouch touch sensing firmware library that is free to use

and allows touch sensing functionality to be implemented reliably in the end application.

STM32U073x8/B/C

Functional overview

DS14548 - Rev 2

page 20/146

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