Datasheet

DocID028798 Rev 3 35/155
STM32L432KB STM32L432KC Functional overview
49
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.
3.16 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.
This digital interface supports the following features:
• Up to two DAC output channels
• 8-bit or 12-bit output mode
• Buffer offset calibration (factory and user trimming)
• Left or right data alignment in 12-bit mode
• Synchronized update capability
• Noise-wave generation
• Triangular-wave generation
• Dual DAC channel independent or simultaneous conversions
• DMA capability for each channel
• External triggers for conversion
• Sample and hold low-power mode, with internal or external capacitor
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
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 130 °C (± 5 °C),
V
DDA
= V
REF+
= 3.0 V (± 10 mV)
0x1FFF 75CA - 0x1FFF 75CB
Table 8. 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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