Table 101. Adc Internal Input/Output Signals; Table 102. External Triggers - ST STM32WL55JC Reference Manual

Analog-to-digital converter (ADC)
Software calibration procedure
1. Ensure that ADEN = 0, ADVREGEN = 1 and DMAEN = 0.
2. Set ADCAL = 1.
3. Wait until ADCAL = 0 (or until EOCAL = 1). This can be handled by interrupt if the
interrupt is enabled by setting the EOCALIE bit in the ADC_IER register
4. The calibration factor can be read from bits 6:0 of ADC_DR or ADC_CALFACT
registers.
ADCAL
ADC State
ADC_DR[6:0]
ADC_CALFACT[6:0]
by S/W
Calibration factor forcing Software Procedure
1. Ensure that ADEN = 1 and ADSTART = 0 (ADC started with no conversion ongoing)
2. Write ADC_CALFACT with the saved calibration factor
3. The calibration factor is used as soon as a new conversion is launched.
calibration factor[6:0]
Start conversion
(hardware or software)
WRITE ADC_CALFACT
CALFACT[6:0]
by S/W
18.3.4 ADC on-off control (ADEN, ADDIS, ADRDY)
At power-up, the ADC is disabled and put in power-down mode (ADEN = 0).
As shown in
converting accurately.
536/1454
OFF Startup
by H/W
Figure 60. Calibration factor forcing
ADC state Ready (not converting)
Internal
F1
by H/W
Figure 61, the ADC needs a stabilization time of t
Figure 59. ADC calibration
t CAB
CALIBRATE
0x00
Converting channel
Updating
(Single ended)
calibration
F2
F2
RM0453 Rev 2
OFF
CALIBRATION
FACTOR
Ready Converting channel
(Single ended)
before it starts
STAB
RM0453
MS33703V1
MS31925V1