STM32L452xx Functional overview
This digital interface supports the following features:
• Up to two DAC output channels
• 8-bit or 12-bit output mode
• Buffer offset calibration (factory and user trimming)
• Left or right data alignment in 12-bit mode
• Synchronized update capability
• Noise-wave generation
• Triangular-wave generation
• Dual DAC channel independent or simultaneous conversions
• DMA capability for each channel
• External triggers for conversion
• Sample and hold low-power mode, with internal or external capacitor
The DAC channels are triggered through the timer update outputs that are also connected to different DMA channels.
3.17 Voltage reference buffer (VREFBUF)
The STM32L452xx devices embed an voltage reference buffer which can be used as voltage reference for ADCs, DAC and also as voltage reference for external components through the VREF+ pin.
The internal voltage reference buffer supports two voltages:
• 2.048 V
• 2.5 V
An external voltage reference can be provided through the VREF+ pin when the internal voltage reference buffer is off.
The VREF+ pin is double-bonded with VDDA on some packages. In these packages the internal voltage reference buffer is not available.
Figure 5. Voltage reference buffer
VREFBUF
Bandgap +
V
DDA
DAC, ADC
-
VREF+
Low frequency cut-off capacitor
100 nF
MSv40197V1
DS11912 Rev 7
41/221
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