Table 111. Dac Features; Figure 86. Dac Block Diagram - ST STM32WL55JC Reference Manual

Digital-to-analog converter (DAC)
19.4.2 DAC pins and internal signals
The DAC includes:
•
One output channel
•
The DACx_OUT1 can be disconnected from the output pin and used as an ordinary
GPIO
•
The dac_out1 can use an internal pin connection to on-chip peripherals such as
comparator, operational amplifier and ADC (if available).
•
DAC output channel buffered or non buffered
•
Sample and hold block and registers operational in Stop mode, using the LSI clock
source (dac_hold_ck) for static conversion.
The DAC includes up to two separate output channels. Each output channel can be
connected to on-chip peripherals such as comparator, operational amplifier and ADC (if
available). In this case, the DAC output channel can be disconnected from the DACx_OUT1
output pin and the corresponding GPIO can be used for another purpose.
The DAC output can be buffered or not. The Sample and hold block and its associated
registers can run in Stop mode using the LSI clock source (dac_hold_ck).
Pin name
VREF+
VDD
VSS
DACx_OUT1 Analog output signal
Internal signal name
dac_ch1_dma
dac_ch1_trgx (x = 1 to 15)
dac_unr_it
dac_pclk
dac_hold_ck
dac_out1
594/1454
Table 112. DAC input/output pins
Signal type
Input, analog reference
positive
Input, analog supply
Input, analog supply ground
Table 113. DAC internal input/output signals
Signal type
Bidirectional DAC channel1 DMA request/acknowledge
Inputs
Output
Input
Input
Analog
output
Table 114. DAC interconnection
Signal name
dac_hold_ck
dac_ch1_trg1
The higher/positive reference voltage for the DAC,
V ≤ V
REF+ DDAmax
Analog power supply
Ground for analog power supply
DACx channel1 analog output
DAC channel1 trigger inputs/acknowledge
DAC underrun interrupt
DAC peripheral clock
DAC low-power clock used in Sample and hold mode
DAC channel1 output for on-chip peripherals
Source
ck_lsi
tim1_trgo
RM0453 Rev 2
Remarks
(refer to datasheet)
Description
Source type
LSI clock selected in the RCC
Internal signal from on-chip
timers TIM1_TGO_CKTIM
RM0453