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EFM32WG980 Datasheet(PDF) 31 Page - List of Unclassifed Manufacturers

Part # EFM32WG980
Description  The EFM32 MCUs are the world?셲 most energy friendly microcontrollers.
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Preliminary
...the world's most energy friendly microcontrollers
2013-05-06 - EFM32WG980FXX - d0202_Rev1.10
31
www.energymicro.com
Table 3.10. Minimum Load Capacitance (CLFXOL) Requirement For Safe Crystal Startup
Symbol
Capacitance [pF]
Shunt Capacitance C0
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
CLmin lfxoboost = 0
redlfxoboost = 1
3.7
4.0
4.3
4.5
4.8
5.0
5.3
5.5
5.7
5.9
6.0
6.2
6.4
6.5
6.7
6.9
CLmin lfxoboost = 1
redlfxoboost = 0
7.3
7.7
8.2
8.6
9.0
9.3
9.6
10.0 10.3 10.5 10.8 11.1 11.3 11.6 11.8 12.1
CLmin lfxoboost = 1
redlfxoboost = 1
10.0 10.6 11.1 11.6 12.1 12.6 13.0 13.4 13.8 14.1 14.5 14.8 15.1 15.4 15.7 16.0
CLmin lfxoboost = 1
redlfxoboost = 0
12.5 13.2 13.9 14.5 15.0 15.5 16.0 16.5 16.9 17.4 17.8 18.2 18.5 18.9 19.3 19.6
3.9.2 HFXO
Table 3.11. HFXO
Symbol
Parameter
Condition
Min
Typ
Max
Unit
fHFXO
Supported nominal crystal
Frequency
4
48
MHz
Crystal frequency 32 MHz
30
60
Ohm
ESRHFXO
Supported crystal equiv-
alent series resistance
(ESR)
Crystal frequency 4 MHz
400
1500
Ohm
gmHFXO
The transconductance of
the HFXO input transistor
at crystal startup
HFXOBOOST in CMU_CTRL
equals 0b11
20
mS
CHFXOL
Supported crystal external
load range
5
25
pF
DCHFXO
Duty cycle
46
50
54
%
4 MHz: ESR=400 Ohm,
CL=20 pF, HFXOBOOST in
CMU_CTRL equals 0b11
85
µA
IHFXO
Current consumption for
HFXO after startup
32 MHz: ESR=30 Ohm,
CL=10 pF, HFXOBOOST in
CMU_CTRL equals 0b11
165
µA
tHFXO
Startup time
32 MHz: ESR=30 Ohm,
CL=10 pF, HFXOBOOST in
CMU_CTRL equals 0b11
400
µs
3.9.3 LFRCO
Table 3.12. LFRCO
Symbol
Parameter
Condition
Min
Typ
Max
Unit
fLFRCO
Oscillation frequency ,
VDD= 3.0 V, TAMB=25°C
32.768
kHz
tLFRCO
Startup time not including
software calibration
150
µs
ILFRCO
Current consumption
190
nA
TUNESTEPL-
FRCO
Frequency step for LSB
change in TUNING value
1.5
%


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