STM32L073CB datasheet(29/139 Pages) STMICROELECTRONICS

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STM32L073xx

Functional overview

3.13.2

VLCD voltage monitoring

This embedded hardware feature allows the application to measure the VLCD supply voltage

using the internal ADC channel ADC_IN16. As the VLCD voltage may be higher than VDDA,

and thus outside the ADC input range, the ADC input is connected to LCD_VLCD2 (which

provides 1/3VLCD when the LCD is configured 1/3Bias and 1/4VLCD when the LCD is

configured 1/4Bias or 1/2Bias).

3.14

Digital-to-analog converter (DAC)

Two 12-bit buffered DACs can be used to convert digital signal into analog voltage signal

output. An optional amplifier can be used to reduce the output signal impedance.

This digital Interface supports the following features:



One data holding register (for each channel)



Left or right data alignment in 12-bit mode



Synchronized update capability



Noise-wave generation



Triangular-wave generation



Dual DAC channels with independent or simultaneous conversions



DMA capability (including the underrun interrupt)



External triggers for conversion



Input reference voltage VREF+

Six DAC trigger inputs are used in the STM32L073xx. The DAC channels are triggered

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

3.15

Ultra-low-power comparators and reference voltage

The STM32L073xx 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 ultra low consumption



One comparator with rail-to-rail inputs, fast or slow mode.



The threshold can be one of the following:

–

DAC output

–

External I/O pins

–

Internal reference voltage (VREFINT)

–

submultiple of Internal reference voltage(1/4, 1/2, 3/4) for the rail to rail

comparator.

Both comparators can wake up the devices 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).

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