STM8L151C4 datasheet(19/101 Pages) STMICROELECTRONICS

19 / 101 page

STM8L151xx, STM8L152xx

Functional overview

Doc ID 15962 Rev 2

19/101

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

Ultralow power comparators

The STM8L15x embeds 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 submultiple (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. Finally,

it provides a set of registers for efficiently managing a set of dedicated I/Os supporting up to

16 capacitive sensing channels using the ProxSenseTM technology.

3.13

Timers

STM8L15xxx devices contain one advanced control timer (TIM1), two 16-bit general

purpose timers (TIM2 and TIM3) and one 8-bit basic timer (TIM4).

All the timers can be served by DMA1.

Table 3 compares the features of the advanced control, general-purpose and basic timers.

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