Datasheet

Functional overview STM32L073xx
28/137 DocID027096 Rev 2
An analog watchdog feature allows very precise monitoring of the converted voltage of one,
some or all scanned channels. An interrupt is generated when the converted voltage is
outside the programmed thresholds.
The events generated by the general-purpose timers (TIMx) can be internally connected to
the ADC start triggers, to allow the application to synchronize A/D conversions and timers.
3.13 Temperature sensor
The temperature sensor (T
SENSE
) generates a voltage V
SENSE
that varies linearly with
temperature.
The temperature sensor is internally connected to the ADC_IN18 input channel which is
used to convert the sensor output voltage into a digital value.
The sensor provides good linearity but it has to be calibrated to obtain good overall
accuracy of the temperature measurement. As the offset of the temperature sensor varies
from chip to chip due to process variation, the uncalibrated internal temperature sensor is
suitable for applications that detect temperature changes only.
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.
3.13.1 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_IN17 input channel. It
enables accurate monitoring of the V
DD
value (when no external voltage, V
REF+
, is available
for ADC). 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.
Table 7. Temperature sensor calibration values
Calibration value name Description Memory address
TSENSE_CAL1
TS ADC raw data acquired at
temperature of 30 °C,
V
DDA
= 3 V
0x1FF8 007A - 0x1FF8 007B
TSENSE_CAL2
TS ADC raw data acquired at
temperature of 130 °C
V
DDA
= 3 V
0x1FF8 007E - 0x1FF8 007F
Table 8. Internal voltage reference measured values
Calibration value name Description Memory address
VREFINT_CAL
Raw data acquired at
temperature of 25 °C
V
DDA
= 3 V
0x1FF8 0078 - 0x1FF8 0079
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