NRF52820-QDAA-R datasheet(64/437 Pages) NORDIC

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Power and clock management

Bit number

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

B A

Reset 0x00000000

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Access

Field

Value ID

Value

Description

VBUSDETECT

VBUS input detection status (USBDETECTED and

USBREMOVED events are derived from this information)

NoVbus

VBUS voltage below valid threshold

VbusPresent

VBUS voltage above valid threshold

OUTPUTRDY

USB supply output settling time elapsed

NotReady

USBREG output settling time not elapsed

Ready

USBREG output settling time elapsed (same information as

USBPWRRDY event)

5.3.7.14 SYSTEMOFF

Address offset: 0x500

System OFF register

Bit number

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Reset 0x00000000

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Access

Field

Value ID

Value

Description

W SYSTEMOFF

Enable System OFF mode

Enter

Enable System OFF mode

5.3.7.15 POFCON

Address offset: 0x510

Power-fail comparator configuration

Bit number

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

D D D D

B B B B A

Reset 0x00000000

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Access

Field

Value ID

Value

Description

RW POF

Enable or disable power failure warning

Disabled

Disable

Enabled

Enable

RW THRESHOLD

Power-fail comparator threshold setting. This setting applies

both for normal voltage mode (supply connected to both

VDD and VDDH) and high voltage mode (supply connected

to VDDH only). Values 0-3 set threshold below 1.7 V and

should not be used as brown out detection will be activated

before power failure warning on such low voltages.

V17

Set threshold to 1.7 V

V18

Set threshold to 1.8 V

V19

Set threshold to 1.9 V

V20

Set threshold to 2.0 V

V21

Set threshold to 2.1 V

V22

Set threshold to 2.2 V

V23

Set threshold to 2.3 V

V24

Set threshold to 2.4 V

V25

Set threshold to 2.5 V

V26

Set threshold to 2.6 V

4463_156 v1.0

NRF52820-QDAA-R Datasheet(PDF) 64 Page - Nordic Semiconductor

NRF52820-QDAA-R Datasheet(HTML) 64 Page - Nordic Semiconductor

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