EFM32PG1 Datasheet, PDF (20/94 Pages) Silicon Laboratories – Industrial and factory automation

4.1.7.2 HFXO
EFM32PG1 Data Sheet
Electrical Specifications
Table 4.10. 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, BOOST³ = 2
Frequency Tolerance for the FT_HFXO
38.4 MHz, ESR = 50 Ω, CL = 10
-40
-
crystal
pF
40
ppm
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.
3. In CMU_HFXOCTRL register
4.1.7.3 LFRCO
Table 4.11. LFRCO
Parameter
Symbol
Test Condition
Oscillation frequency
f_LFRCO
Startup time
t_LFRCO
Current consumption on
AVDD ¹
I_LFRCOANA
Note:
1. Current consumption on DVDD instead if ANASW=1 in EMU_PWRCTRL register
Min
TBD
-
-
Typ
32.768
500
TBD
Max
TBD
-
-
Unit
kHz
μs
nA
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