EZR32HG320 Datasheet, PDF (33/87 Pages) Silicon Laboratories – Consumer electronics

4.10.4 HFRCO
EZR32HG320 Data Sheet
Electrical Specifications
Table 4.12. HFRCO
Symbol
Parameter
Condition
Min
Typ
Max
Unit
24 MHz frequency band
23.28
24.0
24.72 MHz
f_HFRCO
Oscillation frequency,
V_DD = 3.0 V, T_AMB =
25°C
21 MHz frequency band
14 MHz frequency band
11 MHz frequency band
7 MHz frequency band
20.37
13.58
10.67
6.40
21.0
21.63 MHz
14.0
14.42 MHz
11.0
11.33 MHz
6.60
6.80 MHz
1 MHz frequency band
1.15
1.20
1.25 MHz
t_{HFRCO_settling}
Settling time after start- f_HFRCO = 14 MHz
up
0.6
Cycles
f_HFRCO = 24 MHz
158
184 µA
f_HFRCO = 21 MHz
143
175 µA
I_HFRCO
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
TUNE-
STEP_HFRCO
Frequency step for LSB 14 MHz frequency band
change in TUNING val-
ue
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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