STM8L151C4 datasheet(21/142 Pages) STMICROELECTRONICS

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STM8L151x4/6, STM8L152x4/6

Functional overview

Note:

ADC1 can be served by DMA1.

3.10

Digital-to-analog converter (DAC)

•

12-bit DAC with output buffer

•

Synchronized update capability using TIM4

•

DMA capability

•

External triggers for conversion

•

Input reference voltage VREF+ for better resolution

Note:

DAC can be served by DMA1.

3.11

Ultra-low-power comparators

The medium-density STM8L151x4/6 and STM8L152x4/6 embed two comparators (COMP1

and COMP2) sharing the same current bias and voltage reference. The voltage reference

can be internal or external (coming from an I/O).

•

One comparator with fixed threshold (COMP1).

•

One comparator rail to rail with fast or slow mode (COMP2). The threshold can be one

of the following:

–

DAC output

–

External I/O

–

Internal reference voltage or internal reference voltage sub multiple (1/4, 1/2, 3/4)

The two comparators can be used together to offer a window function. They can wake up

from Halt mode.

3.12

System configuration controller and routing interface

The system configuration controller provides the capability to remap some alternate

functions on different I/O ports. TIM4 and ADC1 DMA channels can also be remapped.

The highly flexible routing interface allows application software to control the routing of

different I/Os to the TIM1 timer input captures. It also controls the routing of internal analog

signals to ADC1, COMP1, COMP2, DAC and the internal reference voltage VREFINT. It also

provides a set of registers for efficiently managing the charge transfer acquisition sequence

(Section 3.13: Touch sensing).

3.13

Touch sensing

Medium-density STM8L151x4/6 and STM8L152x4/6 devices provide a simple solution for

adding capacitive sensing functionality to any application. Capacitive sensing technology is

able to detect finger presence near an electrode which is protected from direct touch by a

dielectric (example, glass, plastic). The capacitive variation introduced by a 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. In medium-density STM8L151x4/6

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