EZR32HG220 Datasheet, PDF (33/86 Pages) Silicon Laboratories – Consumer electronics

4.10.4 HFRCO
EZR32HG220 Data Sheet
Electrical Specifications
Table 4.12. HFRCO
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
f_HFRCO 24 MHz frequency band
23.28
24.0
24.72
MHz
t_{HFRCO_set} 21 MHz frequency band
tling
20.37
21.0
21.63
MHz
Oscillation frequency, V_DD = 3.0 V,
T_AMB = 25°C
I_HFRCO 14 MHz frequency band
TUNE- 11 MHz frequency band
STEP_HFR
CO
13.58
14.0
14.42
MHz
10.67
11.0
11.33
MHz
7 MHz frequency band
6.40
6.60
6.80
MHz
1 MHz frequency band
1.15
1.20
1.25
MHz
Settling time after start-up
f_HFRCO = 14 MHz
─
0.6
─
Cycles
f_HFRCO = 24 MHz
─
158
184
µA
f_HFRCO = 21 MHz
─
143
175
µA
Current consumption
f_HFRCO = 14 MHz
f_HFRCO = 11 MHz
─
113
140
µA
─
101
125
µA
f_HFRCO = 6.6 MHz
─
84
105
µA
f_HFRCO = 1.2 MHz
─
27
40
µA
24 MHz frequency band
─
66.8¹
─
kHz
21 MHz frequency band
─
52.8¹
─
kHz
Frequency step for LSB change in
TUNING value
14 MHz frequency band
11 MHz frequency band
─
36.9¹
─
kHz
─
30.1¹
─
kHz
7 MHz frequency band
─
18.0¹
─
kHz
1 MHz frequency band
─
3.4
─
kHz
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 21 MHz across operating condi-
tions.
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