Datasheet

19.8.5 3.3V Brown-Out Detector (BOD33) Control
Name: BOD33
Offset: 0x10
Reset: Determined from NVM User Row
Property: Write-Synchronized, PAC Write-Protection
Bit 31 30 29 28 27 26 25 24
VBATLEVEL[7:0]
Access
R/W R/W R/W R/W R/W R/W R/W R/W
Reset 0 0 0 0 0 0 0 0
Bit 23 22 21 20 19 18 17 16
LEVEL[7:0]
Access
R/W R/W R/W R/W R/W R/W R/W R/W
Reset 0 0 x x x x x x
Bit 15 14 13 12 11 10 9 8
PSEL[2:0] HYST[3:0]
Access
R/W R/W R/W R/W R/W R/W R/W
Reset 0 0 0 x x x x
Bit 7 6 5 4 3 2 1 0
RUNBKUP RUNHIB RUNSTDBY STDBYCFG ACTION[1:0] ENABLE
Access
R/W R/W R/W R/W R/W R/W R/W
Reset 0 0 0 0 y y z
Bits 31:24 – VBATLEVEL[7:0] BOD33 Threshold Level on VBAT
This field sets the triggering voltage threshold for the BOD33 when the BOD33 monitors VBAT in battery
backup sleep mode.
This field is not synchronized.
Bits 23:16 – LEVEL[7:0] BOD33 Threshold Level on VDD
This field sets the triggering voltage threshold for the BOD33 when the BOD33 monitors VDD. If an
hysteresis value is programmed (BOD33.HYST), this field corresponds to the lower threshold (V
BOD-
).
These bits are loaded from NVM User Row at start-up.
This field is not synchronized.
The VBOD- input voltage can be calculated as follows: VBOD- = 1.5 + LEVEL[7:0) x Level_Step
And the upper threshold (VBOD+) is then: VBOD+ = VBOD- + N x HYST_STEP, With N=0 to 15
according to HYST[3:0] value and HYST_STEP = Level_Step, (refer to Bits 11:8 – HYST[3:0]: BOD33
Hysteresis voltage value on VDD).
At the upper side of Level[7:0] values depending on the Hysteresis value chosen with HYST[3:0], the
VBOD+ level reaches an overflow, e.g., for HYST[3:0] = 0d2 the hysteresis is 2 x Level_Step = 12 mV up
to position 253 and position 254 to 255 above must not be used.
Bits 14:12 – PSEL[2:0] Prescaler Select
Selects the prescaler divide-by output for the BOD33 sampling mode available in hibernate, backup or
battery backup mode. The input clock comes from the OSCULP32K 32KHz output.
SAM D5x/E5x Family Data Sheet
SUPC – Supply Controller
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 255