Data Sheet

Page 43
nRF51822 Product Specification v3.1
8.1.6 32.768 kHz RC oscillator (32k RCOSC)
Table 26 32.768 kHz RC oscillator
8.1.7 32.768 kHz Synthesized oscillator (32k SYNT)
Table 27 32.768 kHz Synthesized oscillator
Symbol Description Note Min. Typ. Max. Units
Tes t
level
f
NOM,RC32k
Nominal frequency. 32.768 kHz N/A
f
TOL,RC32k
Frequency tolerance. ±2 % 3
f
TOL,CAL,RC32k
Frequency tolerance. Calibration interval 4 s ±250 ppm 1
I
RC32k
Run current. 0.5 0.8 1.1 µA 1
t
START,RC32k
Startup time. 390 487 µs 1
Symbol Description Note Min. Typ. Max. Units
Test
level
f
NOM,SYNT32k
Nominal frequency. 32.768 kHz 1
f
TOL,SYNT
Frequency tolerance.
f
TOL,XO16M
±8
f
TOL,XO32M
±8
ppm 1
I
SYNT32k
Run and startup current for
32.768 kHz Synthesized clock
including the 16M XOSC.
15 µA 1
t
START,SYNT32k
Startup time for 32.768 kHz
Synthesized clock.
406 µs 1