EFR32BG1V132F256 Datasheet, PDF (37/94 Pages) Silicon Laboratories – ConfidentialEFR32BG1 Blue Gecko Bluetooth® Smart SoC CSP Family

4.1.10.2 HFXO
EFR32BG1 Blue Gecko Bluetooth® Smart SoC CSP Family Data Sheet
Electrical Specifications
Confidential ^{Table4.19. 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.
4.1.10.3 LFRCO
Parameter
Oscillation frequency
Symbol
f_LFRCO
Startup time
Current consumption ¹
t_LFRCO
I_LFRCO
Table 4.20. LFRCO
Test Condition
ENVREF = 1 in
CMU_LFRCOCTRL
ENVREF = 0 in
CMU_LFRCOCTRL
ENVREF = 1 in
CMU_LFRCOCTRL
ENVREF = 0 in
CMU_LFRCOCTRL
Min
Typ
Max
Unit
26.2
32.768
34.5
kHz
26.2
32.768
34.5
kHz
—
500
—
μs
—
342
—
nA
—
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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