NRF52811-QFAA-R7 datasheet(61/444 Pages) NORDIC

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Power and clock management

Symbol

Description

Min.

Typ.

Max.

Units

tOFF2ON

Time from OFF to CPU execute

16.5

µs

tIDLE2CPU

Time from IDLE to CPU execute

3.0

µs

tEVTSET,CL1

Time from HW event to PPI event in Constant Latency

System ON mode

0.0625

µs

tEVTSET,CL0

Time from HW event to PPI event in Low Power System ON

mode

0.0625

µs

5.3.10.2 Power fail comparator

Symbol

Description

Min.

Typ.

Max.

Units

VPOF

Nominal power level warning thresholds (falling supply

voltage). Levels are configurable between Min. and Max. in

100mV increments.

1.7

2.8

VPOFTOL

Threshold voltage tolerance

±1

±5

VPOFHYST

Threshold voltage hysteresis

VBOR,OFF

Brown out reset voltage range SYSTEM OFF mode

1.2

1.7

VBOR,ON

Brown out reset voltage range SYSTEM ON mode

1.48

1.7

5.4 CLOCK — Clock control

The clock control system can source the system clocks from a range of internal or external high and low

frequency oscillators and distribute them to modules based upon a module’s individual requirements.

Clock distribution is automated and grouped independently by module to limit current consumption in

unused branches of the clock tree.

Listed here are the main features for CLOCK:

• 64 MHz on-chip oscillator

• 64 MHz crystal oscillator, using external 32 MHz crystal

• 32.768 kHz +/-500 ppm RC oscillator

• 32.768 kHz crystal oscillator, using external 32.768 kHz crystal

• 32.768 kHz oscillator synthesized from 64 MHz oscillator

• Firmware (FW) override control of oscillator activity for low latency start up

• Automatic oscillator and clock control, and distribution for ultra-low power

4454_140 v1.0

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