EFM32JG1 Datasheet, PDF (19/94 Pages) Silicon Laboratories – The EFM32 Jade Gecko MCUs are the world’s most energyfriendly microcontrollers

4.1.7 Oscillators
4.1.7.1 LFXO
EFM32JG1 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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