EFM32TG840 Datasheet, PDF (22/70 Pages) Silicon Laboratories – Output state retention and wake-up from Shutoff Mode

3.9.3 LFRCO
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Table 3.10. LFRCO
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
34.24 kHz
150
µs
210
380 nA
1.5
%
Figure 3.10. Calibrated LFRCO Frequency vs Temperature and Supply Voltage
42
40
38
- 40°C
36
25°C
85°C
34
32
30
2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8
Vdd [V]
42
40
38
36
34
32
30
–4 0
2.0 V
3.0 V
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
f_HFRCO = 14 MHz
I_HFRCO
Current consump- fHFRCO = 28 MHz
tion (Production test
condition = 14 MHz) ^{fHFRCO = 21 MHz}
Min
Typ
Max
Unit
27.16
28.0
28.84 MHz
20.37
21.0
21.63 MHz
13.58
14.0
14.42 MHz
10.67
6.40¹
1.16²
11.0
6.60¹
1.20²
11.33 MHz
6.80¹ MHz
1.24² MHz
0.6
Cycles
160
190 µA
125
155 µA
2015-03-06 - EFM32TG840FXX - d0011_Rev1.40
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