EFM32GG380 Datasheet, PDF (23/70 Pages) List of Unclassifed Manufacturers – EFM32GG380 DATASHEET

Preliminary
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Table 3.10. Minimum Load Capacitance (C_LFXOL) 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
CL_min 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
CL_min 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
CL_min 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
CL_min 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
f_HFXO
ESR_HFXO
g_mHFXO
C_HFXOL
DC_HFXO
I_HFXO
t_HFXO
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
Condition
Min
Crystal frequency 32 MHz
Crystal frequency 4 MHz
HFXOBOOST in CMU_CTRL
equals 0b11
4 MHz: ESR=400 Ohm,
C_L=20 pF, HFXOBOOST in
CMU_CTRL equals 0b11
32 MHz: ESR=30 Ohm,
C_L=10 pF, HFXOBOOST in
CMU_CTRL equals 0b11
32 MHz: ESR=30 Ohm,
C_L=10 pF, HFXOBOOST in
CMU_CTRL equals 0b11
Typ
4
Max
Unit
48 MHz
30
60 Ohm
400
1500 Ohm
20
mS
5
46
50
85
25 pF
54 %
µA
165
µA
400
µs
3.9.3 LFRCO
Table 3.12. LFRCO
Symbol
Parameter
f_LFRCO
t_LFRCO
Oscillation frequency ,
V_DD= 3.0 V, T_AMB=25°C
Startup time not including
software calibration
I_LFRCO
Current consumption
TUNESTEP_L- Frequency step for LSB
FRCO
change in TUNING value
Condition
Min
Typ
Max
Unit
32.768
kHz
150
µs
190
nA
1.5
%
2012-09-11 - EFM32GG380FXX - d0039_Rev1.00
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