EFM32GG232 Datasheet, PDF (23/71 Pages) Silicon Laboratories – High Performance 32-bit processor

3.9.3 LFRCO
Table 3.10. LFRCO
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Symbol
Parameter
Condition
f_LFRCO
t_LFRCO
Oscillation frequen-
cy , V_DD= 3.0 V,
T_AMB=25°C
Startup time not in-
cluding software
calibration
I_LFRCO
Current consump-
tion
TUNESTEP_L- Frequency step
FRCO
for LSB change in
TUNING value
Min
Typ
Max
Unit
31.29
32.768
34.28 kHz
150
µs
300
900 nA
1.5
%
Figure 3.10. Calibrated LFRCO Frequency vs Temperature and Supply Voltage
42
40
38
36
34
32
30
2.0 2.2
2.6
3.0
Vdd [V]
- 40°C
25°C
85°C
3.4
3.8
42
40
38
36
34
32
30
–4 0
2.0 V
3V
3.8 V
–1 5
5
25
45
65
85
Tem perature [°C]
3.9.4 HFRCO
Table 3.11. HFRCO
Symbol
Parameter
Condition
28 MHz frequency band
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
Settling time after
band switch
f_HFRCO = 14 MHz
Min
Typ
Max
Unit
27.5
28.0
28.5 MHz
20.6
21.0
21.4 MHz
13.7
14.0
14.3 MHz
10.8
6.48¹
1.15²
11.0
6.60¹
1.20²
11.2 MHz
6.72¹ MHz
1.25² MHz
0.6
Cycles
25
Cycles
2016-03-21 - EFM32GG232FXX - d0125_Rev1.40
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