EFM32ZG108 Datasheet, PDF (31/54 Pages) Silicon image – Energy, gas, water and smart metering

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Figure 3.25. Calibrated HFRCO 21 MHz Band Frequency vs Supply Voltage and Temperature
21.2
21.0
20.8
20.6
20.4
- 40°C
25°C
85°C
20.2
2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8
Vdd [V]
21.2
21.0
20.8
20.6
20.4
20.2
–4 0
2.0 V
3.0 V
3.8 V
–1 5
5
25
45
65
85
Tem perature [°C]
3.9.5 AUXHFRCO
Table 3.12. AUXHFRCO
Symbol
Parameter
Condition
f_AUXHFRCO = 21 MHz
f_AUXHFRCO
Oscillation frequen-
cy, V_DD= 3.0 V,
T_AMB=25°C
f_AUXHFRCO = 14 MHz
f_AUXHFRCO = 11 MHz
f_AUXHFRCO = 6.6 MHz
f_AUXHFRCO = 1.2 MHz
t_{AUXHFRCO_settling}Settling time after
start-up
f_AUXHFRCO = 14 MHz
TUNESTEP_AUX-Frequency step
HFRCO
for LSB change in
TUNING value
3.9.6 ULFRCO
Table 3.13. ULFRCO
Symbol
f_ULFRCO
TC_ULFRCO
VC_ULFRCO
Parameter
Condition
Oscillation frequen- 25°C, 3V
cy
Temperature coeffi-
cient
Supply voltage co-
efficient
Min
Typ
20.37
13.58
10.67
6.40
1.15
Max
Unit
21.0
21.63 MHz
14.0
14.42 MHz
11.0
11.33 MHz
6.60
6.80 MHz
1.20
1.25 MHz
0.6
Cycles
0.3
%
Min
Typ
0.70
Max
Unit
1.75 kHz
0.05
%/°C
-18.2
%/V
2015-03-06 - EFM32ZG108FXX - d0063_Rev1.10
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