NRF51422-QFAA-R7 datasheet(43/115 Pages) NORDIC

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Page 43

nRF51422 Product Specification v3.1

8.1.6

32.768 kHz RC oscillator (32k RCOSC)

Table 26 32.768 kHz RC oscillator

Note: The ANT protocol stack requires an accuracy of ±50 ppm, thus the 32.768 kHz RC oscillator

must not be used when running the ANT stack.

8.1.7

32.768 kHz Synthesized oscillator (32k SYNT)

Table 27 32.768 kHz Synthesized oscillator

Symbol

Description

Note

Min.

Typ.

Max.

Units

Test

level

fNOM,RC32k

Nominal frequency.

32.768

kHz

N/A

fTOL,RC32k

Frequency tolerance.

±2

fTOL,CAL,RC32k

Frequency tolerance.

Calibration interval 4 s

±250

ppm

IRC32k

Run current.

0.5

0.8

1.1

μA

tSTART,RC32k

Startup time.

390

487

μs

Symbol

Description

Note

Min.

Typ.

Max.

Units

Test

level

fNOM,SYNT32k

Nominal frequency.

32.768

kHz

fTOL,SYNT

Frequency tolerance.

The ANT protocol stack

requires an accuracy of

±50 ppm on the

32.768 kHz clock.

fTOL,XO16M ±8

fTOL,XO32M ±8

ppm

ISYNT32k

Run and startup current for

32.768 kHz Synthesized clock

including the 16M XOSC.

μA

tSTART,SYNT32k

Startup time for 32.768 kHz

Synthesized clock.

406

μs

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