STM32L151XD datasheet(26/140 Pages) STMICROELECTRONICS

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Functional overview

STM32L151xD STM32L152xD

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Doc ID 022027 Rev 6

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.

3.11.2

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.

3.12

DAC (digital-to-analog converter)

The two 12-bit buffered DAC channels can be used to convert two digital signals into two

analog voltage signal outputs. The chosen design structure is composed of integrated

resistor strings and an amplifier in non-inverting configuration.

This dual digital Interface supports the following features:

●

Two DAC converters: one for each output channel

●

Up to 10-bit output

●

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+

Table 6.

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 00FA - 0x1FF8 00FB

TSENSE_CAL2

TS ADC raw data acquired at

temperature of 110 °C

VDDA= 3 V

0x1FF8 00FE - 0x1FF8 00FF

Table 7.

Internal voltage reference measured values

Calibration value name

Description

Memory address

VREFINT_CAL

Raw data acquired at

temperature of 30 °C

VDDA= 3 V

0x1FF8 00F8 - 0x1FF8 00F9

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