Product Specs

Table Of Contents
19 CLOCK Clock control
Page
110
Symbol
Description
Min.
Typ.
Max.
Units
t
START_LFXO
Startup time for 32.768 kHz crystal oscillator
0.25
s
V
AMP_IN_XO_LOW
Peak to peak amplitude for external low swing clock. Input
signal must not swing outside supply rails.
200 1000 mV
19.4.5 32.768 kHz synthesized from HFCLK (LFSYNT)
Symbol
Description
Min.
Typ.
Max.
Units
f
NOM_LFSYNT
Nominal frequency
32.768
kHz
f
TOL_LFSYNT
Frequency tolerance in addition to HFLCK tolerance
15
8
ppm
I
LFSYNT
Run current for synthesized 32.768 kHz
100
µA
t
START_LFSYNT
Startup time for synthesized 32.768 kHz
100
us
15
Frequency tolerance will be derived from the HFCLK source clock plus the LFSYNT tolerance