EZR32HG220 Datasheet, PDF (31/86 Pages) Silicon Laboratories – Consumer electronics

4.10 Oscillators
EZR32HG220 Data Sheet
Electrical Specifications
4.10.1 LXFO
Table 4.9. LFXO
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Supported nominal crystal fre-
quency
f_LFXO
31.3
32.768
34.3
kHz
Supported crystal equivalent
series resistance (ESR)
ESR_LFXO
─
30
120
kΩ
Supported crystal external load
range
C_LFXOL
5
─
25
pF
Current consumption for core
I_LFXO
ESR=30 kΩ, C_L=10 pF, LFXO-
─
190
─
nA
and buffer after startup
BOOST in CMU_CTRL is 1
Start- up time
t_LFXO
ESR=30 kΩ, C_L=10 pF, 40% -
─
1100
─
ms
60% duty cycle has been
reached, LFXOBOOST in
CMU_CTRL is 1
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.
4.10.2 HFXO
Table 4.10. HFXO
Parameter
Symbol
Test Condition
Min
Supported frequency, any
f_HFXO
4
mode
Supported crystal equivalent
series resistance (ESR)
Crystal frequency 25 MHz
ESR_HFXO
Crystal frequency 4 MHz
─
─
The transconductance of the
g_mHFXO HFXOBOOST in CMU_CTRL equals
20
HFXO input transistor at crys-
0b11
tal startup
Supported crystal external
load range
C_HFXOL
5
Current consumption for
HFXO after startup
4 MHz: ESR=400 Ohm, C_L=20 pF,
─
HFXOBOOST in CMU_CTRL equals
0b11
I_HFXO
25 MHz: ESR=30 Ohm, C_L=10 pF,
─
HFXOBOOST in CMU_CTRL equals
0b11
Startup time
t_HFXO 25 MHz: ESR=30 Ohm, C_L=10 pF,
─
HFXOBOOST in CMU_CTRL equals
0b11
Typ
Max
Unit
─
25
MHz
30
100
Ω
400
1500
Ω
─
─
ms
─
25
pF
85
─
µA
165
─
µA
785
─
µs
silabs.com | Smart. Connected. Energy-friendly.
Rev. 1.0 | 30