Datasheet

Functional overview STM32L476xx
42/270 DS10198 Rev 8
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.
3.15.2 Internal voltage reference (V
REFINT
)
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 V
BAT
battery voltage monitoring
This embedded hardware feature allows the application to measure the V
BAT
battery voltage
using the internal ADC channel ADC1_IN18 or ADC3_IN18. As the V
BAT
voltage may be
higher than V
DDA
, 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 V
BAT
voltage.
3.16 Digital to analog converter (DAC)
Two 12-bit buffered DAC channels can be used to convert digital signals into analog voltage
signal outputs. The chosen design structure is composed of integrated resistor strings and
an amplifier in inverting configuration.
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),
V
DDA
= V
REF+
= 3.0 V (± 10 mV)
0x1FFF 75A8 - 0x1FFF 75A9
TS_CAL2
TS ADC raw data acquired at a
temperature of 110 °C (± 5 °C),
V
DDA
= V
REF+
= 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),
V
DDA
= V
REF+
= 3.0 V (± 10 mV)
0x1FFF 75AA - 0x1FFF 75AB
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