EFM32ZG222 Datasheet, PDF (26/66 Pages) Silicon image – Energy, gas, water and smart metering

3.9.3 LFRCO
Table 3.10. LFRCO
Preliminary
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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
32.768
kHz
150
µs
190
nA
1.5
%
Figure 3.20. Calibrated LFRCO Frequency vs Temperature and Supply Voltage
42
- 40°C
25°C
40
85°C
38
36
34
32
30
1.8
2.2
2.6
3.0
3.4
3.8
Vdd [V]
42
40
38
36
34
32
30
–4 0
1.8 V
3V
3.8 V
–1 5
5
25
45
65
85
Tem perature [°C]
2013-10-09 - EFM32ZG222FXX - d0066_Rev0.60
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