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EFM32WG980 Datasheet(PDF) 30 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
30
www.energymicro.com
3.9 Oscillators
3.9.1 LFXO
Table 3.9. LFXO
Symbol
Parameter
Condition
Min
Typ
Max
Unit
fLFXO
Supported nominal crystal
frequency
32.768
kHz
ESRLFXO
Supported crystal equiv-
alent series resistance
(ESR)
30
120
kOhm
CLFXOL
Supported crystal external
load range
5
25
pF
DCLFXO
Duty cycle
48
50
53.5
%
ILFXO
Current consumption for
core and buffer after start-
up.
ESR=30 kOhm, CL=10 pF,
LFXOBOOST in CMU_CTRL
is 1
190
nA
tLFXO
Start- up time.
ESR=30 kOhm, CL=10 pF,
40% - 60% duty cycle has
been reached, LFXOBOOST
in CMU_CTRL is 1
400
ms
For safe startup of a given crystal, the load capacitance should be larger than the value indicated in
Figure 3.22 (p. 30) and in Table 3.10 (p. 31) for a given LFXOBOOST setting. The minimum
supported load capacitance depends on the crystal shunt capacitance, C0, which is specified in crystal
vendors’ datasheet.
Figure 3.22. Minimum Load Capacitance (CLFXOL) Requirement For Safe Crystal Startup
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
C0 [ pF]
2
4
6
8
10
12
14
16
18
20
LFXOBOOST= 0,REDLFXOBOOST= 1
LFXOBOOST= 0,REDLFXOBOOST= 0
LFXOBOOST= 1,REDLFXOBOOST= 1
LFXOBOOST= 1,REDLFXOBOOST= 0


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