EFM32G Data Sheet
Electrical Characteristics
4.9 Oscillators
4.9.1 LFXO
Table 4.8. LFXO
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Supported nominal crystal fre-
quency
fLFXO
—
32.768
—
kHz
Supported crystal equivalent ser- ESRLFXO
ies resistance (ESR)
—
30
—
120
25
—
kOhm
pF
X1
—
Supported crystal external load
range
CLFXOL
Current consumption for core and ILFXO
buffer after startup
ESR=30 kΩ, CL=10 pF, LFXO-
BOOST in CMU_CTRL is 1
190
400
nA
Start-up time
tLFXO
ESR=30 kΩ, CL=10 pF, 40% -
60% duty cycle has been
reached, LFXOBOOST in
CMU_CTRL is 1
—
—
ms
Note:
1. See Minimum Load Capacitance (CLFXOL) Requirement For Safe Crystal Startup in Configurator in Simplicity Studio.
For safe startup of a given crystal, the Configurator tool in Simplicity Studio contains a tool to help users configure both load capaci-
tance and software settings for using the LFXO. For details regarding the crystal configuration, the reader is referred to application note
"AN0016 EFM32 Oscillator Design Consideration".
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