4.11 High-Frequency Crystal
Table 4.11. High-Frequency Crystal
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Crystal frequency
f
HFXTAL
—
38.4
—
MHz
Initial calibrated accuracy
ACC
HFXTAL
-10
—
10
ppm
Temperature drift
DRIFT
HFXTAL
Across specified temperature
range
-20
—
20
ppm
4.12 Low Frequency Crystal Oscillator
Table 4.12. Low Frequency Crystal Oscillator
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Crystal Frequency
F
LFXO
—
32.768
—
kHz
Supported Crystal equivalent
series resistance (ESR)
ESR
LFXO
GAIN = 0
—
—
80
kΩ
GAIN = 1 to 3
—
—
100
kΩ
Supported range of crystal
load capacitance
C
LFXO_CL
GAIN = 0
4
—
6
pF
GAIN = 1
6
—
10
pF
GAIN = 2 (see note
10
—
12.5
pF
GAIN = 3 (see note
12.5
—
18
pF
Current consumption
I
CL12p5
ESR = 70 kOhm, CL = 12.5 pF,
GAIN
—
357
—
nA
Startup Time
T
STARTUP
ESR = 70 kOhm, CL = 7 pF,
GAIN
—
63
—
ms
On-chip tuning cap step size SS
LFXO
—
0.26
—
pF
On-chip tuning capacitor val-
ue at minimum setting
C
LFXO_MIN
CAPTUNE = 0
—
4
—
pF
On-chip tuning capacitor val-
ue at maximum setting
C
LFXO_MAX
CAPTUNE = 0x4F
—
24.5
—
pF
Note:
1. Total load capacitance seen by the crystal
2. Crystals with a load capacitance of greater than 12 pF require external load capacitors.
3. In LFXO_CAL Register
4. In LFXO_CFG Register
5. The effective load capacitance seen by the crystal will be C
LFXO
/2. This is because each XTAL pin has a tuning cap and the two
caps will be seen in series by the crystal
BGM220S Wireless Gecko Bluetooth
®
Module Data Sheet
Electrical Characteristics
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