EFM32PG1 Datasheet, PDF (19/94 Pages) Silicon Laboratories – Industrial and factory automation

4.1.7 Oscillators
4.1.7.1 LFXO
EFM32PG1 Data Sheet
Electrical Specifications
Table 4.9. LFXO
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Crystal frequency
f_LFXO
-
32.768
-
kHz
Supported crystal equivalent ESR_LFXO
series resistance (ESR)
-
-
70
kΩ
Supported range of crystal
load capacitance ¹
C_{LFXO_CL}
6
-
18
pF
On-chip tuning cap range ^{2 C}LFXO_T
On each of LFXTAL_N and
LFXTAL_P pins
8
-
40
pF
On-chip tuning cap step size SS_LFXO
-
0.25
-
pF
LFXO current consumption I_{LFXO_ANA}
ESR = 30 kΩ, C_L=12.5 pF, GAIN⁴
-
273
-
nA
on AVDD ³after startup
= 3, AGC⁴ = 1
Start- up time
t_LFXO
ESR=30 kΩ, C_L=12.5 pF, GAIN⁴
-
308
-
ms
=2
Note:
1. Total load capacitance as seen by the crystal
2. The effective load capacitance seen by the crystal will be C_{LFXO_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. Current consumption on DVDD instead if ANASW=1 in EMU_PWRCTRL register
4. In CMU_LFXOCTRL register
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