STM32F398VE datasheet(20/151 Pages) STMICROELECTRONICS

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Functional overview

STM32F398VE

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DocID027227 Rev 2

The events generated by the general-purpose timers and the advanced-control timer (TIM1,

TIM8 and TIM20) can be internally connected to the ADC start trigger and injection trigger,

respectively, to allow the application to synchronize A/D conversion and timers.

3.14.1

Temperature sensor

The temperature sensor (TS) generates a voltage VSENSE that varies linearly with

temperature.

The temperature sensor is internally connected to the ADC1_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.

3.14.2

Internal voltage reference (VREFINT)

The internal voltage reference (VREFINT) provides a stable (bandgap) voltage output for the

ADC and Comparators. VREFINT is internally connected to the ADCx_IN18, x=1...4 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.

3.14.3

VBAT battery voltage monitoring

This embedded hardware feature allows the application to measure the VBAT battery voltage

using the internal ADC channel ADC1_IN17. As the VBAT voltage may be higher than VDDA,

and thus outside the ADC input range, the VBAT pin is internally connected to a bridge

divider by 2. As a consequence, the converted digital value is half the VBAT voltage.

3.14.4

OPAMP reference voltage (VREFOPAMP)

Every OPAMP reference voltage can be measured using a corresponding ADC internal

channel: VREFOPAMP1 connected to ADC1 channel 15, VREFOPAMP2 connected to

ADC2 channel 17, VREFOPAMP3 connected to ADC3 channel 17 and VREFOPAMP4

connected to ADC4 channel 17.

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