STM8AL3188TCX datasheet(21/131 Pages) STMICROELECTRONICS

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STM8AL318x STM8AL3L8x

Functional overview

3.9

Analog-to-digital converter

•

12-bit analog-to-digital converter (ADC1) with 28 channels (including 4 fast channel),

temperature sensor and internal reference voltage

•

Conversion time down to 1 µs with fSYSCLK= 16 MHz

•

Programmable resolution

•

Programmable sampling time

•

Single and continuous mode of conversion

•

Scan capability: automatic conversion performed on a selected group of analog inputs

•

Analog watchdog: interrupt generation when the converted voltage is outside the

programmed threshold

•

Triggered by timer

Note:

ADC1 can be served by DMA1.

3.10

Digital-to-analog converter

•

12-bit DAC with 2 buffered outputs (two digital signals are converted into two analog

voltage signal outputs)

•

Synchronized update capability using timers

•

DMA capability for each channel

•

External triggers for conversion

•

Noise-wave generation

•

Triangular-wave generation

•

Dual DAC channels with independent or simultaneous conversions

•

Input reference voltage VREF+ for better resolution

Note:

DAC can be served by DMA1.

3.11

Ultra-low-power comparators

The high-density STM8AL3x8x devices embed two comparators (COMP1 and COMP2)

sharing the same current bias and voltage reference. The voltage reference is an 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 is 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 are usable together to offer a window function. They wake up from

Halt mode.

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