STM32F301X6 Datasheet, PDF (21/135 Pages) STMicroelectronics – ARM Cortex-M4 32-bit MCU+FPU, up to 64 KB Flash, 16 KB SRAM, ADC, DAC, COMP, Op-Amp, 2.0 – 3.6 V

STM32F301x6 STM32F301x8
Functional overview
3.11.3
V_BAT battery voltage monitoring
This embedded hardware feature allows the application to measure the V_BAT battery voltage
using the internal ADC channel ADC1_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
Digital-to-analog converter (DAC)
One 12-bit buffered DAC channel (DAC1_OUT1) 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:
• One DAC output channel
• 8-bit or 12-bit monotonic output
• Left or right data alignment in 12-bit mode
• Synchronized update capability
• Noise-wave generation
• Triangular-wave generation
• DMA capability
• External triggers for conversion
3.13
Operational amplifier (OPAMP)
The STM32F301x6/8 devices embed one operational amplifier with external or internal
follower routing and PGA capability (or even amplifier and filter capability with external
components). When the operational amplifier is selected, an external ADC channel is used
to enable output measurement.
The operational amplifier features:
• 8.2 MHz bandwidth
• 0.5 mA output capability
• Rail-to-rail input/output
• In PGA mode, the gain can be programmed to be 2, 4, 8 or 16.
DocID025146 Rev 6
21/135
51