
4.1.9 Oscillators
4.1.9.1 Low-Frequency Crystal Oscillator (LFXO)
Table 4.21. Low-Frequency Crystal Oscillator (LFXO)
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Crystal frequency
f
LFXO
—
32.768
—
kHz
Supported crystal equivalent
series resistance (ESR)
ESR
LFXO
—
—
70
kΩ
Supported range of crystal
load capacitance
C
LFXO_CL
6
—
18
pF
On-chip tuning cap range
C
LFXO_T
On each of LFXTAL_N and
LFXTAL_P pins
8
—
40
pF
On-chip tuning cap step size SS
LFXO
—
0.25
—
pF
Current consumption after
startup
I
LFXO
ESR = 70 kOhm, C
L
= 7 pF,
GAIN
—
273
—
nA
Start- up time
t
LFXO
ESR = 70 kOhm, C
L
= 7 pF,
GAIN
—
308
—
ms
Note:
1. Total load capacitance as seen by the crystal.
2. The effective load capacitance seen by the crystal will be C
LFXO_T
/2. This is because each XTAL pin has a tuning cap and the
two caps will be seen in series by the crystal.
3. Block is supplied by AVDD if ANASW = 0, or DVDD if ANASW=1 in EMU_PWRCTRL register.
4. In CMU_LFXOCTRL register.
4.1.9.2 High-Frequency Crystal Oscillator (HFXO)
Table 4.22. High-Frequency Crystal Oscillator (HFXO)
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Crystal frequency
f
HFXO
38.4 MHz required for radio trans-
ciever operation
—
38.4
—
MHz
Frequency tolerance for the
crystal
FT
HFXO
-40
—
40
ppm
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SiP Module Data Sheet
Electrical Specifications
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