EFM32G Data Sheet
Electrical Characteristics
4.9.2 HFXO
Parameter
Table 4.9. HFXO
Symbol
Test Condition
Min
Typ
Max
Unit
Supported nominal crystal Fre-
quency
fHFXO
4
—
32
MHz
Crystal frequency 32 MHz
Crystal frequency 4 MHz
—
—
20
30
400
—
60
1500
—
Ω
Ω
Supported crystal equivalent ser-
ies resistance (ESR)
ESRHFXO
The transconductance of the
HFXO input transistor at crystal
startup
gmHFXO
HFXOBOOST in CMU_CTRL
equals 0b11
mS
Supported crystal external load
range
CHFXOL
5
—
25
—
pF
µA
4 MHz: ESR=400 Ω, CL=20 pF,
HFXOBOOST in CMU_CTRL
equals 0b11
—
85
Current consumption for HFXO
after startup
IHFXO
32 MHz: ESR=30 Ω, CL=10 pF,
HFXOBOOST in CMU_CTRL
equals 0b11
—
—
1
165
400
—
—
—
4
µA
µs
ns
Startup time
32 MHz: ESR=30 Ω, CL=10 pF,
HFXOBOOST in CMU_CTRL
equals 0b11
tHFXO
Pulse width removed by glitch de-
tector
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