Datasheet

EN
t
BOD.ENABLE
detection
inactive
1 0 1
detection
inactive
detection
active
Figure 23. Disabling
and enabling brown-
out detection
Detection is re-enabled if the BOD register is reset, as this sets the register’s EN field to one. Again, detection will become
active after a delay equal to the brown-out detection enable delay (t
BOD.ENABLE
).

NOTE
If the BOD register is reset by a power-on or brown-out initiated reset, the delay between the register being reset and
brown-out detection becoming active will be equal to the brown-out detection activation delay (t
BOD.ACTIVE
). The delay will
be equal to the brown-out detection enable delay (t
BOD.ENABLE
) for all other reset sources.
2.11.3.2. Adjusting the Detection Threshold
The brown-out detection threshold (DVDD
TH.BOD
) has a nominal value of 0.86V at initial power-on or after a reset event. This
should result in a detection threshold between 0.83V and 0.89V. Once out of reset, the threshold can be adjusted under
software control. The new detection threshold will take effect after the brown-out detection programming delay ((t
BOD.PROG
).
An example of this is shown in Figure 24.
The threshold is adjusted by writing to the VSEL field in the BOD register. See the BOD register description for details.
VSEL
t
BOD.PROG
threshold
0.86V
1001 0111
threshold
0.774V
Figure 24. Adjusting
the brown-out
detection threshold
2.11.3.3. Detailed Specifications
Table 188. Brown-out
Detection Parameters
Parameter Description Min Typ Max Units
DVDD
TH.BOD
brown-out
detection
threshold
96.5 100 103.5 % of selected
threshold voltage
t
BOD.ACTIVE
brown-out
detection
activation delay
55 80 μs
RP2040 Datasheet
2.11. Chip-Level Reset 150