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EFM32GG395 Datasheet, PDF (23/78 Pages) Silicon Laboratories – Read-while-write support | |||
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3.9.2 HFXO
Table 3.10. HFXO
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Symbol
fHFXO
ESRHFXO
gmHFXO
CHFXOL
DCHFXO
IHFXO
tHFXO
Parameter
Condition
Min
Supported nominal
crystal Frequency
Supported crystal
equivalent series re-
sistance (ESR)
Crystal frequency 48 MHz
Crystal frequency 32 MHz
Crystal frequency 4 MHz
The transconduc-
tance of the HFXO
input transistor at
crystal startup
HFXOBOOST in CMU_CTRL
equals 0b11
Supported crystal
external load range
Duty cycle
Current consump-
tion for HFXO after
startup
4 MHz: ESR=400 Ohm,
CL=20 pF, HFXOBOOST in
CMU_CTRL equals 0b11
32 MHz: ESR=30 Ohm,
CL=10 pF, HFXOBOOST in
CMU_CTRL equals 0b11
Startup time
32 MHz: ESR=30 Ohm,
CL=10 pF, HFXOBOOST in
CMU_CTRL equals 0b11
Typ
4
20
5
46
Max
Unit
48 MHz
50 Ohm
30
60 Ohm
400
1500 Ohm
mS
25 pF
50
54 %
85
µA
165
µA
400
µs
3.9.3 LFRCO
Table 3.11. LFRCO
Symbol
Parameter
Condition
fLFRCO
tLFRCO
Oscillation frequen-
cy , VDD= 3.0 V,
TAMB=25°C
Startup time not in-
cluding software
calibration
ILFRCO
Current consump-
tion
TUNESTEPL- Frequency step
FRCO
for LSB change in
TUNING value
Min
Typ
Max
Unit
31.29
32.768
34.28 kHz
150
µs
300
nA
1.5
%
2014-05-23 - EFM32GG395FXX - d0078_Rev1.30
23
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