EFM32WG360 Datasheet, PDF (32/75 Pages) Silicon Laboratories – Operation from backup battery when main power drains out

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3.9.5 AUXHFRCO
Table 3.12. AUXHFRCO
Symbol
Parameter
Condition
Min
Typ
Max
Unit
28 MHz frequency band
28.0
MHz
21 MHz frequency band
21.0
MHz
f_AUXHFRCO
Oscillation frequen-
cy, V_DD= 3.0 V,
T_AMB=25°C
14 MHz frequency band
11 MHz frequency band
7 MHz frequency band
14.0
MHz
11.0
MHz
6.60
MHz
1 MHz frequency band
1.20
MHz
t_{AUXHFRCO_settling}Settling time after
start-up
f_AUXHFRCO = 14 MHz
0.6
Cycles
TUNESTEP_AUX-Frequency step
HFRCO
for LSB change in
TUNING value
0.3¹
%
1_{The TUNING field in the CMU_AUXHFRCOCTRL register may be used to adjust the AUXHFRCO 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 AUXHFRCO frequency at any arbitrary value between 7 MHz and 28 MHz
across operating conditions.
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
0.7
Max
Unit
1.75 kHz
0.05
%/°C
-18.2
%/V
3.10 Analog Digital Converter (ADC)
Table 3.14. ADC
Symbol
Parameter
Condition
V_ADCIN
Single ended
Input voltage range
Differential
V_ADCREFIN
Input range of exter-
nal reference volt-
age, single ended
and differential
V_{ADCREFIN_CH7} Input range of ex-
ternal negative ref-
erence voltage on
channel 7
See V_ADCREFIN
V_{ADCREFIN_CH6} Input range of ex-
ternal positive ref-
erence voltage on
channel 6
See V_ADCREFIN
Min
Typ
0
-V_REF/2
1.25
Max
Unit
V_REF V
V_REF/2 V
V_DD V
0
V_DD - 1.1 V
0.625
V_DD V
2014-10-15 - EFM32WG360FXX - d0283_Rev1.00
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