Datasheet

Functional overview STM32F313xx
16/58 Doc ID 023636 Rev 1
3.12.2 Internal voltage reference (V
REFINT
)
The internal voltage reference (V
REFINT
) provides a stable (bandgap) voltage output for the
ADC and Comparators. V
REFINT
is internally connected to the ADC_IN18 input channel.
The precise voltage of V
REFINT
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.
3.12.3 V
BAT
battery voltage monitoring
This embedded hardware feature allows the application to measure the V
BAT
battery voltage
using the internal ADC channel ADC_IN17. As the V
BAT
voltage may be higher than V
DDA
,
and thus outside the ADC input range, the V
BAT
pin is internally connected to a bridge
divider by 2. As a consequence, the converted digital value is half the V
BAT
voltage.
3.12.4 OPAMP reference voltage (VOPAMP)
Every OPAMP reference voltage can be measured using a corresponding ADC internal
channel: VOPAMP1 connected to ADC1 channel 15, VOPAMP2 connected to ADC2
channel 17, VOPAMP3 connected to ADC3 channel 17, VOPAMP4 connected to ADC4
channel 17.
3.13 DAC (digital-to-analog converter)
Up to 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 3. Temperature sensor calibration values
Calibration value name Description Memory address
TS_CAL1
TS ADC raw data acquired at
temperature of 30 °C,
V
DDA
= 3.3 V
0x1FFF F7B8 - 0x1FFF F7B9
TS_CAL2
TS ADC raw data acquired at
temperature of 110 °C
V
DDA
= 3.3 V
0x1FFF F7C2 - 0x1FFF F7C3
Table 4. Temperature sensor calibration values
Calibration value name Description Memory address
VREFINT_CAL
Raw data acquired at
temperature of 30 °C
V
DDA
= 3.3 V
0x1FFF F7BA - 0x1FFF F7BB