EZR32LG330 Datasheet, PDF (29/87 Pages) Silicon Laboratories – Building and home automation

4.10.4 HFRCO
EZR32LG330 Data Sheet
Electrical Specifications
Table 4.13. HFRCO
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
28 MHz frequency band
27.5
28.0
28.5
MHz
21 MHz frequency band
20.6
21.0
21.4
MHz
Oscillation frequency, V_DD=
3.0 V, T_AMB=25 °C
f_HFRCO
14 MHz frequency band
11 MHz frequency band
13.7
14.0
14.3
MHz
10.8
11.0
11.2
MHz
7 MHz frequency band
6.48
6.60
6.72
MHz
1 MHz frequency band
1.15
1.20
1.25
MHz
Settling time after start-up
t_{HFRCO_set-}
tling
f_HFRCO = 14 MHz
─
0.6
─
Cycles
f_HFRCO = 28 MHz
─
165
215
µA
f_HFRCO = 21 MHz
─
134
175
µA
Current consumption
I_HFRCO
f_HFRCO = 14 MHz
f_HFRCO = 11 MHz
─
106
140
µA
─
94
125
µA
f_HFRCO = 6.6 MHz
─
77
105
µA
f_HFRCO = 1.2 MHz
─
25
40
µA
Duty cycle
DC_HFRCO
f_HFRCO = 14 MHz
48.5
50
51
%
Frequency step for LSB
change in TUNING value
TUNE-
STEP_HFRC
O
─
0.3¹
─
%
Note:
1. The TUNING field in the CMU_HFRCOCTRL register may be used to adjust the HFRCO frequency. There is enough adjustment
range to ensure that the frequency bands above 7 MHz will always have some overlap across supply voltage and temperature.
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 HFRCO frequency at any arbitrary value between 7 MHz and 28 MHz across operating condi-
tions.
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