STM32L151RDT6 datasheet(27/140 Pages) STMICROELECTRONICS

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STM32L151xD STM32L152xD

Functional overview

Doc ID 022027 Rev 6

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Eight DAC trigger inputs are used in the STM32L15xxD. The DAC channels are triggered

through the timer update outputs that are also connected to different DMA channels.

3.13

Operational amplifier

The STM32L15xxD embeds three operational amplifiers with external or internal follower

routing capability (or even amplifier and filter capability with external components). When

one operational amplifier is selected, one external ADC channel is used to enable output

measurement.

The operational amplifiers feature:

●

Low input bias current

●

Low offset voltage

●

Low power mode

●

Rail-to-rail input

3.14

Ultra-low-power comparators and reference voltage

The STM32L15xxD embeds 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 a 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).

3.15

System configuration controller and routing interface

The system configuration controller provides the capability to remap some alternate

functions on different I/O ports.

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

different I/Os to the TIM2, TIM3 and TIM4 timer input captures. It also controls the routing of

internal analog signals to ADC1, COMP1 and COMP2 and the internal reference voltage

VREFINT.

3.16

Touch sensing

The STM32L15xxD devices provide a simple solution for adding capacitive sensing

functionality to any application. These devices offer up to 34 capacitive sensing channels

distributed over 11 analog I/O groups. Both software and timer capacitive sensing

acquisition modes are supported.

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