EFR32FG1 Datasheet, PDF (32/101 Pages) Silicon Laboratories – Electronic Shelf Labels

4.1.11 Oscillators
4.1.11.1 LFXO
EFR32FG1 Flex Gecko Proprietary Protocol SoCFamily Data Sheet
Electrical Specifications
Table 4.19. LFXO
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Crystal frequency
f_LFXO
—
32.768
—
kHz
Supported crystal equivalent ESR_LFXO
series resistance (ESR)
—
—
70
kΩ
Supported range of crystal
load capacitance ¹
C_{LFXO_CL}
6
—
18
pF
On-chip tuning cap range ^{2 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 ³
I_LFXO
ESR = 30 kΩ, C_L=12.5 pF, GAIN⁴
—
273
—
nA
= 3, AGC⁴ = 1
Start- up time
t_LFXO
ESR=30 kΩ, C_L=12.5 pF, GAIN⁴
—
308
—
ms
=2
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
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