efm32g890 ETC-unknow, efm32g890 Datasheet - Page 27

• Manufacturer Part Number: efm32g890
• Description: Ic Microcontroller
• Manufacturer: ETC-unknow

3.9 Oscillators
3.9.1 LFXO
3.9.2 HFXO
2010-12-17 - d0010_Rev1.20
Table 3.9. LFXO
Table 3.10. HFXO
Symbol
f
ESR
C
DC
I
t
Symbol
f
ESR
g
C
DC
I
t
LFXO
LFXO
LFXO
HFXO
HFXO
HFXO
mHFXO
LFXOL
HFXOL
LFXO
HFXO
LFXO
HFXO
Parameter
Supported nominal crystal
frequency
Supported crystal equiv-
alent series resistance
(ESR)
Supported crystal external
load range
Duty cycle
Current consumption for
core and buffer after start-
up.
Start- up time.
Parameter
Supported nominal crystal
Frequency
Supported crystal equiv-
alent series resistance
(ESR)
The transconductance of
the HFXO input transistor
at crystal startup
Supported crystal external
load range
Duty cycle
Current consumption for
HFXO after startup
Startup time
Pulse width removed by
glitch detector
Condition
ESR=30 kOhm, C
LFXOBOOST in CMU_CTRL
is 1
ESR=30 kOhm, C
40% - 60% duty cycle has
been reached, LFXOBOOST
in CMU_CTRL is 1
Condition
Crystal frequency 32 MHz
Crystal frequency 4 MHz
HFXOBOOST in CMU_CTRL
equals 0b11
4 MHz: ESR=400 Ohm,
C
CMU_CTRL equals 0b11
32 MHz: ESR=30 Ohm,
C
CMU_CTRL equals 0b11
32 MHz: ESR=30 Ohm,
C
CMU_CTRL equals 0b11
L
L
L
=20 pF, HFXOBOOST in
=10 pF, HFXOBOOST in
=10 pF, HFXOBOOST in
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27
L
L
=10 pF,
=10 pF,
Min
Min
48
20
46
5
4
5
1
Typ
Typ
32.768
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190
400
400
165
400
30
50
30
50
85
Max
Max
1500 Ohm
53.5 %
120 kOhm
25 pF
32 MHz
60 Ohm
25 pF
54 %
4 ns
Unit
kHz
nA
ms
Unit
mS
µA
µA
µs