EFR32BG1B232 Datasheet, PDF (74/163 Pages) Silicon Laboratories – EFR32BG1 Blue Gecko Bluetooth® Smart SoC Family Data Sheet

4.1.12.2 HFXO
EFR32BG1 Blue Gecko Bluetooth® Smart SoC Family Data Sheet
Electrical Specifications
Table 4.32. HFXO
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Crystal Frequency
f_HFXO
38.4 MHz required for radio trans-
38
ciever operation.
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.
4.1.12.3 LFRCO
Table 4.33. LFRCO
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Oscillation frequency
f_LFRCO
ENVREF = 1 in
CMU_LFRCOCTRL
30.474
32.768
34.243
kHz
ENVREF = 0 in
CMU_LFRCOCTRL
30.474
32.768
33.915
kHz
Startup time
t_LFRCO
—
500
—
μs
Current consumption ¹
I_LFRCO
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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