EFM32TG225 Datasheet, PDF (23/66 Pages) Silicon Laboratories – Configurable peripheral I/O locations

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Symbol
Parameter
Condition
Min
Typ
Max
Unit
f_HFRCO = 14 MHz
104
120 µA
f_HFRCO = 11 MHz
94
110 µA
f_HFRCO = 6.6 MHz
63
90 µA
f_HFRCO = 1.2 MHz
22
32 µA
TUNESTEP_H- Frequency step
FRCO
for LSB change in
TUNING value
0.3³
%
1_{For devices with prod. rev. < 19, Typ = 7MHz and Min/Max values not applicable.}
2_{For devices with prod. rev. < 19, Typ = 1MHz and Min/Max values not applicable.}
3_{The TUNING field in the CMU_HFRCOCTRL register may be used to adjust the HFRCO frequency. There is enough adjustment}
range to ensure that the frequency bands above 7 MHz will always have some overlap across supply voltage and temperature. By
using a stable frequency reference such as the LFXO or HFXO, a firmware calibration routine can vary the TUNING bits and the
frequency band to maintain the HFRCO frequency at any arbitrary value between 7 MHz and 28 MHz across operating conditions.
Figure 3.11. Calibrated HFRCO 1 MHz Band Frequency vs Supply Voltage and Temperature
1.45
1.40
1.35
1.30
1.25
1.20
- 40°C
25°C
85°C
1.15
1.10
1.05
2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8
Vdd [V]
1.45
1.40
1.35
1.30
1.25
1.20
1.15
1.10
1.05
–4 0
2.0 V
3.0 V
3.8 V
–1 5
5
25
45
65
85
Tem perature [°C]
Figure 3.12. Calibrated HFRCO 7 MHz Band Frequency vs Supply Voltage and Temperature
6.70
6.65
6.60
6.55
6.50
6.45
6.40
6.35
- 40°C
25°C
85°C
6.30
2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8
Vdd [V]
6.70
6.65
6.60
6.55
6.50
6.45
6.40
6.35
6.30
–4 0
2.0 V
3.0 V
3.8 V
–1 5
5
25
45
65
85
Tem perature [°C]
2015-03-06 - EFM32TG225FXX - d0205_Rev1.40
23
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