STM32L072X8 datasheet(29/160 Pages) STMICROELECTRONICS

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DS10689 Rev 5

29/160

STM32L072xx

Functional overview

To improve the accuracy of the temperature sensor measurement, each device is

individually factory-calibrated by ST. The temperature sensor factory calibration data are

stored by ST in the system memory area, accessible in read-only mode.

3.12.1

Internal voltage reference (VREFINT)

The internal voltage reference (VREFINT) provides a stable (bandgap) voltage output for the

ADC and Comparators. VREFINT is internally connected to the ADC_IN17 input channel. It

enables accurate monitoring of the VDD value (when no external voltage, VREF+, is available

for ADC). The precise voltage of VREFINT is individually measured for each part by ST during

production test and stored in the system memory area. It is accessible in read-only mode.

3.13

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 STM32L072xx. The DAC channels are triggered

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

Table 7. Temperature sensor calibration values

Calibration value name

Description

Memory address

TSENSE_CAL1

TS ADC raw data acquired at

temperature of 30 °C,

VDDA= 3 V

0x1FF8 007A - 0x1FF8 007B

TSENSE_CAL2

TS ADC raw data acquired at

temperature of 130 °C

VDDA= 3 V

0x1FF8 007E - 0x1FF8 007F

Table 8. Internal voltage reference measured values

Calibration value name

Description

Memory address

VREFINT_CAL

Raw data acquired at

temperature of 25 °C

VDDA = 3 V

0x1FF8 0078 - 0x1FF8 0079

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