STM32L071KB datasheet(28/148 Pages) STMICROELECTRONICS

28 / 148 page

Functional overview

STM32L071xx

28/148

DS10690 Rev 7

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

Ultra-low-power comparators and reference voltage

The STM32L071xx 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:

–

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).

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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