STM32L412RBT3XXX datasheet(38/192 Pages) STMICROELECTRONICS

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Functional overview

STM32L412xx

38/192

DS12469 Rev 8

3.15.2

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 ADC1_IN0 input

channel. 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.

3.15.3

VBAT battery voltage monitoring

This embedded hardware feature allows the application to measure the VBAT battery voltage

using the internal ADC channel ADC1_IN18 or ADC3_IN18. As the VBAT voltage may be

higher than VDDA, and thus outside the ADC input range, the VBAT pin is internally

connected to a bridge divider by 3. As a consequence, the converted digital value is one

third the VBAT voltage.

3.16

Comparators (COMP)

The STM32L412xx devices embed one rail-to-rail comparator with programmable reference

voltage (internal or external), hysteresis and speed (low speed for low-power) and with

selectable output polarity.

The reference voltage can be one of the following:

•

External I/O

•

Internal reference voltage or submultiple (1/4, 1/2, 3/4).

All comparators can wake up from Stop mode, generate interrupts and breaks for the timers

and can be also combined into a window comparator.

3.17

Operational amplifier (OPAMP)

The STM32L412xx embeds one operational amplifier with external or internal follower

routing and PGA capability.

Table 8. Temperature sensor calibration values

Calibration value name

Description

Memory address

TS_CAL1

TS ADC raw data acquired at a

temperature of 30 °C (± 5 °C),

VDDA = VREF+ = 3.0 V (± 10 mV)

0x1FFF 75A8 - 0x1FFF 75A9

TS_CAL2

TS ADC raw data acquired at a

temperature of 130 °C (± 5 °C),

VDDA = VREF+ = 3.0 V (± 10 mV)

0x1FFF 75CA - 0x1FFF 75CB

Table 9. Internal voltage reference calibration values

Calibration value name

Description

Memory address

VREFINT

Raw data acquired at a

temperature of 30 °C (± 5 °C),

VDDA = VREF+ = 3.0 V (± 10 mV)

0x1FFF 75AA - 0x1FFF 75AB

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