EFM32ZG210 Datasheet, PDF (27/65 Pages) Silicon image – Energy, gas, water and smart metering

3.9.4 HFRCO
Table 3.11. HFRCO
Preliminary
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Symbol
Parameter
Condition
21 MHz frequency band
f_HFRCO
Oscillation frequen-
cy, V_DD= 3.0 V,
T_AMB=25°C
14 MHz frequency band
11 MHz frequency band
7 MHz frequency band
1 MHz frequency band
t_{HFRCO_settling} Settling time after
start-up
f_HFRCO = 14 MHz
f_HFRCO = 21 MHz
I_HFRCO
Current consump-
tion
DC_HFRCO
Duty cycle
TUNESTEP_H- Frequency step
FRCO
for LSB change in
TUNING value
f_HFRCO = 14 MHz
f_HFRCO = 11 MHz
f_HFRCO = 6.6 MHz
f_HFRCO = 1.2 MHz
f_HFRCO = 14 MHz
Min
Typ
Max
Unit
21
MHz
14
MHz
11
MHz
6.6
MHz
1.2
MHz
0.6
Cycles
93
µA
77
µA
72
µA
63
µA
22
µA
48.5
50
51 %
0.3
%
Figure 3.21. Calibrated HFRCO 11 MHz Band Frequency vs Supply Voltage and Temperature
11.15
11.10
11.05
11.00
10.95
- 40°C
25°C
85°C
10.90
10.85
10.80
1.8
2.2
2.6
3.0
3.4
3.8
Vdd [V]
11.20
11.15
11.10
1.8 V
3V
3.8 V
11.05
11.00
10.95
10.90
10.85
10.80
–4 0
–1 5
5
25
45
65
85
Tem perature [°C]
2013-10-09 - EFM32ZG210FXX - d0065_Rev0.60
27
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