STM32L151VBH6TR 查看數據表（PDF） - STMicroelectronics

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STM32L151VBH6TR

Ultra-low-power 32-bit MCU ARM®-based Cortex®-M3, 128KB Flash, 16KB SRAM, 4KB EEPROM, LCD, USB, ADC, DAC

STMicroelectronics 

Functional overview

STM32L151x6/8/B STM32L152x6/8/B

This dual digital Interface supports the following features:

• two DAC converters: one for each output channel

• left or right data alignment in 12-bit mode

• synchronized update capability

• noise-wave generation

• triangular-wave generation

• dual DAC channels’ independent or simultaneous conversions

• DMA capability for each channel (including the underrun interrupt)

• external triggers for conversion

• input reference voltage VREF+

Eight DAC trigger inputs are used in the STM32L151x6/8/B and STM32L152x6/8/B devices.

The DAC channels are triggered through the timer update outputs that are also connected

to different DMA channels.

3.12

Ultra-low-power comparators and reference voltage

The STM32L151x6/8/B and STM32L152x6/8/B devices embed two comparators sharing

the same current bias and reference voltage. The reference voltage can be internal or

external (coming from an I/O).

• one comparator with fixed threshold

• one comparator with rail-to-rail inputs, fast or slow mode. The threshold can be one of

the following:

– DAC output

– External I/O

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

Both comparators can wake up from Stop mode, and be combined into a window

comparator.

The internal reference voltage is available externally via a low power / low current output

buffer (driving current capability of 1 µA typical).

3.13

Routing interface

This interface controls the internal routing of I/Os to TIM2, TIM3, TIM4 and to the

comparator and reference voltage output.

3.14

Touch sensing

The STM32L151x6/8/B and STM32L152x6/8/B devices provide a simple solution for adding

capacitive sensing functionality to any application. These devices offer up to 20 capacitive

sensing channels distributed over 10 analog I/O groups. Only software capacitive sensing

acquisition mode is supported.

Capacitive sensing technology is able to detect the presence of a finger near a sensor 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

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DocID17659 Rev 12

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