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EFR32BG12 Datasheet, PDF (75/181 Pages) – | |||
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4.1.12 Oscillators
4.1.12.1 Low-Frequency Crystal Oscillator (LFXO)
EFR32BG12 Blue Gecko Bluetooth ®Low Energy SoC Family Data Sheet
Electrical Specifications
Table 4.33. Low-Frequency Crystal Oscillator (LFXO)
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Crystal frequency
fLFXO
â
32.768
â
kHz
Supported crystal equivalent ESRLFXO
series resistance (ESR)
â
â
70
kâ¦
Supported range of crystal
load capacitance 1
CLFXO_CL
6
â
18
pF
On-chip tuning cap range 2 CLFXO_T
On each of LFXTAL_N and
LFXTAL_P pins
8
â
40
pF
On-chip tuning cap step size SSLFXO
â
0.25
â
pF
Current consumption after
startup 3
ILFXO
ESR = 70 kOhm, CL = 7 pF,
GAIN4 = 2, AGC4 = 1
â
273
â
nA
Start- up time
tLFXO
ESR = 70 kOhm, CL = 7 pF,
GAIN4 = 2
â
308
â
ms
Note:
1. Total load capacitance as seen by the crystal.
2. The effective load capacitance seen by the crystal will be CLFXO_T /2. This is because each XTAL pin has a tuning cap and the
two caps will be seen in series by the crystal.
3. Block is supplied by AVDD if ANASW = 0, or DVDD if ANASW=1 in EMU_PWRCTRL register.
4. In CMU_LFXOCTRL register.
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