EFR32MG1 Datasheet, PDF (37/94 Pages) Silicon Laboratories – Home and Building Automation and Security

4.1.11.2 HFXO
EFR32MG1 Mighty Gecko SoC with Integrated Serial Flash Data Sheet
Electrical Specifications
Table 4.19. HFXO
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Crystal Frequency
f_HFXO
38
38.4
40
MHz
Supported crystal equivalent ESR_HFXO
series resistance (ESR)
Crystal frequency 38.4 MHz
—
—
60
Ω
Supported range of crystal
load capacitance ¹
C_{HFXO_CL}
6
—
12
pF
On-chip tuning cap range ^{2 C}HFXO_T
On each of HFXTAL_N and
HFXTAL_P pins
9
20
25
pF
On-chip tuning capacitance SS_HFXO
step
—
0.04
—
pF
Startup time
t_HFXO
38.4 MHz, ESR = 50 Ω, C_L = 10
—
300
—
μs
pF
Frequency Tolerance for the FT_HFXO
38.4 MHz, ESR = 50 Ω, CL = 10
-40
—
40
ppm
crystal
pF
Note:
1. Total load capacitance as seen by the crystal
2. The effective load capacitance seen by the crystal will be C_{HFXO_T} /2. This is because each XTAL pin has a tuning cap and the
two caps will be seen in series by the crystal.
4.1.11.3 LFRCO
Table 4.20. LFRCO
Parameter
Symbol
Test Condition
Min
Oscillation frequency
f_LFRCO
ENVREF = 1 in
CMU_LFRCOCTRL, T_AMB ≤ 85
°C
30.474
ENVREF = 1 in
CMU_LFRCOCTRL, T_AMB > 85
°C
30.474
ENVREF = 0 in
CMU_LFRCOCTRL
30.474
Startup time
t_LFRCO
—
Current consumption ¹
I_LFRCO
ENVREF = 1 in
—
CMU_LFRCOCTRL
ENVREF = 0 in
—
CMU_LFRCOCTRL
Note:
1. Block is supplied by AVDD if ANASW = 0, or DVDD if ANASW=1 in EMU_PWRCTRL register
Typ
32.768
—
32.768
500
342
494
Max
34.243
39.7
33.915
—
—
—
Unit
kHz
kHz
kHz
μs
nA
nA
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