NRF9160-SIBA-R datasheet(56/400 Pages) NORDIC

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Power and clock management

5.1.4.4.3 32.768 kHz high accuracy oscillator (LFXO)

Symbol

Description

Min.

Typ.

Max.

Units

fNOM_LFXO

Frequency

32.768

kHz

fTOL_LFXO

Frequency tolerance

+-20

ppm

tSTART_LFXO

Startup time

200

5.1.4.4.4 32.768 kHz RC oscillator (LFRC)

Symbol

Description

Min.

Typ.

Max.

Units

fNOM_LFRC

Nominal frequency

32.768

kHz

fTOL_LFRC

Frequency tolerance

tSTART_LFRC

Startup time

600

µs

5.1.5 Reset

There are multiple reset sources that may trigger a reset of the system. After a reset the CPU can query

the RESETREAS (reset reason register) to find out which source generated the reset.

5.1.5.1 Power-on reset

The power-on reset generator initializes the system at power-on. The system is held in reset state until the

supply has reached the minimum operating voltage and the internal voltage regulators have started.

5.1.5.2 Pin reset

A pin reset is generated when the physical reset pin (nRESET) on the device is pulled low.

To ensure that reset is issued correctly, the reset pin should be held low for time given in Pin reset on page

58 .

nRESET pin has an always-on internal pull-up resistor connected to nRF9160 internal voltage typically of

2.2 V level. This is illustrated in the figure below. The value of the pull-up resistor is given in Pin reset on

page 58.

Note: Driving nRESET high with a voltage lower than 2.2V will result in additional leakage.

nReset

pin reset

nRF91

2.2V

Figure 12: Pin reset internal generation

5.1.5.3 Wakeup from System OFF mode reset

The device is reset when it wakes up from System OFF mode.

The Debug access port is not reset following a wake up from System OFF mode if the device is in debug

interface mode, see Overview on page 369 chapter for more information.

4418_1315 v2.0

NRF9160-SIBA-R Datasheet(PDF) 56 Page - Nordic Semiconductor

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