STM32F373VCT6 Datasheet, PDF (17/128 Pages) STMicroelectronics – ARM Cortex-M4F 32b MCU+FPU, up to 256KB Flash+32KB SRAM timers, 4 ADCs (12/16-bit), 3 DACs, 2 comp., 2.0-3.6 V operation

STM32F37x
Functional overview
3.12
3.12.1
3.12.2
3.12.3
12-bit analog-to-digital converter (ADC)
The 12-bit analog-to-digital converter is based on a successive approximation register
(SAR) architecture. It has up to 16 external channels (AIN15:0) and 3 internal channels
(temperature sensor, voltage reference, V_BAT voltage measurement) performing
conversions in single-shot or scan modes. In scan mode, automatic conversion is performed
on a selected group of analog inputs.
The ADC can be served by the DMA controller.
An analog watchdog feature allows very precise monitoring of the converted voltage of one,
some or all selected channels. An interrupt is generated when the converted voltage is
outside the programmed thresholds.
The events generated by the timers (TIMx) can be internally connected to the ADC start and
injection trigger, respectively, to allow the application to synchronize A/D conversion and
timers.
Temperature sensor
The temperature sensor (TS) generates a voltage V_SENSE that varies linearly with
temperature.
The temperature sensor is internally connected to the ADC_IN16 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. See Table 65:
Temperature sensor calibration values on page 103.
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. 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.
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_IN18. 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 divider by 2.
As a consequence, the converted digital value is half the V_BAT voltage.
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