STM32F373VC datasheet(20/137 Pages) STMICROELECTRONICS

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Functional overview

STM32F373xx

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DocID022691 Rev 7

3.15

Fast comparators (COMP)

The STM32F373xx embeds 2 comparators with rail-to-rail inputs and high-speed output.

The reference voltage can be internal or external (delivered by an I/O).

The threshold can be one of the following:

•

DACs channel outputs

•

External I/O

•

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

VREFINT)

The comparators can be combined into a window comparator.

Both comparators can wake up the device from Stop mode and generate interrupts and

breaks for the timers.

3.16

Touch sensing controller (TSC)

The devices provide a simple solution for adding capacitive sensing functionality to any

application. Capacitive sensing technology is able to detect the presence of a finger near an

electrode which is protected from direct touch by a dielectric (glass, 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. It consists

of charging the electrode capacitance and then transferring a part of the accumulated

charges into a sampling capacitor until the voltage across this capacitor has reached a

specific threshold. To limit the CPU bandwidth usage this acquisition is directly managed by

the hardware touch sensing controller and only requires few external components to

operate.

The touch sensing controller is fully supported by the STMTouch touch sensing firmware

library, which is free to use and allows touch sensing functionality to be implemented reliably

in the end application.

Up to 24 touch sensing electrodes can be controlled by the TSC. The touch sensing I/Os are

organized in 8 acquisition groups, with up to 4 I/Os in each group.

Table 3. Capacitive sensing GPIOs available on STM32F373xx devices

Group

Capacitive sensing

signal name

Pin name

Group

Capacitive sensing

signal name

name

TSC_G1_IO1

PA0

TSC_G5_IO1

PB3

TSC_G1_IO2

PA1

TSC_G5_IO2

PB4

TSC_G1_IO3

PA2

TSC_G5_IO3

PB6

TSC_G1_IO4

PA3

TSC_G5_IO4

PB7

TSC_G2_IO1

PA4(1)

TSC_G6_IO1

PB14

TSC_G2_IO2

PA5(1)

TSC_G6_IO2

PB15

TSC_G2_IO3

PA6(1)

TSC_G6_IO3

PD8

TSC_G2_IO4

PA7

TSC_G6_IO4

PD9

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