DAC main features

AN3126

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Doc ID16895 Rev 2

Figure 2. STM32F100x DAC trigger channels

1.5

DMA capabilities

The STM32 microcontrollers have a DMA module with multiple channels. Each DAC

channel is connected to an independent DMA channel. In the case of STM32F100x

Microcontrollers, the DAC channel 1 is connected to the DMA channel 3 and DAC channel2

is connected to DMA channel 4.

When DMA is not utilized, the CPU is used to provide DAC with the pattern waveform.

Generally the waveform is saved in a memory (RAM), and the CPU is in charge of

transferring the data from RAM to the DAC.

Figure 3. DAC interaction without DMA

ai18302

DAC

RAM

(Pattern Table 1)

(Pattern Table 2)

Channel 1

Output

Channel 2

Output

DAC Triggers

CPU