EFM32G Data Sheet
Electrical Characteristics
4.9.5 AUXHFRCO
Parameter
Table 4.12. AUXHFRCO
Test Condition
Symbol
Min
Typ
Max
Unit
Oscillation frequency, VDD= 3.0 fAUXHFRCO
V, TAMB=25 ºC
14 MHz frequency band
13.580
14.0
14.420
MHz
Settling time after start-up
Duty cycle
tAUXHFRCO_settling
DCAUXHFRCO
fAUXHFRCO = 14 MHz
fAUXHFRCO = 14 MHz
—
48.5
—
0.6
50
—
51
—
Cycles
%
0.31
Frequency step for LSB change TUNESTEPAUXHFRCO
in TUNING value
%
Note:
1. The TUNING field in the CMU_AUXHFRCOCTRL register may be used to adjust the AUXHFRCO frequency. By using a stable
frequency reference such as the LFXO or HFXO, a firmware calibration routine can vary the TUNING bits and the frequency band
to maintain the AUXHFRCO frequency at any arbitrary value in the 14 MHz range across operating conditions.
4.9.6 ULFRCO
Table 4.13. ULFRCO
Parameter
Symbol
Test Condition
Min
0.7
—
Typ
—
Max
1.75
—
Unit
kHz
Oscillation frequency
Temperature coefficient
Supply voltage coefficient
fULFRCO
25 °C, 3 V
TCULFRCO
VCULFRCO
0.05
-18.2
%/°C
%/V
—
—
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