Data Sheet

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 +/-5 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
1
C
LFXO_CL
GAIN = 0 4 — 6 pF
GAIN = 1 6 — 10 pF
GAIN = 2 10 — 12.5 pF
GAIN = 3 (see note
2
)
12.5 — 18 pF
Current consumption I
CL12p5
ESR = 70 kOhm, CL = 12.5 pF,
GAIN
3
= 2, AGC
4
= 1
— 357 — nA
Startup Time T
STARTUP
ESR = 70 kOhm, CL = 7 pF,
GAIN
3
= 1, AGC
4
= 1
— 63 — ms
On-chip tuning cap step size SS
LFXO
— 0.26 — pF
On-chip tuning capacitor val-
ue at minimum setting
5
C
LFXO_MIN
CAPTUNE = 0 — 4 — pF
On-chip tuning capacitor val-
ue at maximum setting
5
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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