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SLWSTK6020A Datasheet, PDF (34/102 Pages) Silicon Laboratories – EFR32BG1 Blue Gecko Bluetooth® Smart SoC Family Data Sheet
4.1.11.2 HFXO
EFR32BG1 Blue Gecko Bluetooth® Smart SoCFamily Data Sheet
Electrical Specifications
Table 4.20. HFXO
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Crystal Frequency
fHFXO
38
38.4
40
MHz
Supported crystal equivalent ESRHFXO
series resistance (ESR)
Crystal frequency 38.4 MHz
—
—
60
Ω
Supported range of crystal
load capacitance 1
CHFXO_CL
6
—
12
pF
On-chip tuning cap range 2 CHFXO_T
On each of HFXTAL_N and
HFXTAL_P pins
9
20
25
pF
On-chip tuning capacitance SSHFXO
step
—
0.04
—
pF
Startup time
tHFXO
38.4 MHz: ESR=50 Ω, CL = 10
—
300
—
μs
pF, BOOST3 = 2
Frequency Tolerance for the FTHFXO
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 CHFXO_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. In CMU_HFXOCTRL register
4.1.11.3 LFRCO
Table 4.21. LFRCO
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Oscillation frequency
fLFRCO
ENVREF = 1 in
CMU_LFRCOCTRL
TBD
32.768
TBD
kHz
ENVREF = 0 in
CMU_LFRCOCTRL
TBD
32.768
TBD
kHz
Startup time
tLFRCO
—
500
—
μs
Current consumption 1
ILFRCO
ENVREF = 1 in
CMU_LFRCOCTRL
—
342
—
nA
ENVREF = 0 in
CMU_LFRCOCTRL
—
494
—
nA
Note:
1. Block is supplied by AVDD if ANASW = 0, or DVDD if ANASW=1 in EMU_PWRCTRL register
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