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BLUENRG-2 Datasheet(PDF) 173 Page - STMicroelectronics

Part # BLUENRG-2
Description  Bluetooth® low energy wireless system-on-chip
PDF  190 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

BLUENRG-2 Datasheet(HTML) 173 Page - STMicroelectronics

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BlueNRG-2
Electrical specifications
DocID030675 Rev 2
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9.5
High speed crystal oscillator characteristics
Characteristics measured over recommended operating conditions unless otherwise
specified. Typical value are referred to TA = 25 °C, VBAT = 3.0 V.
Table 222: High speed crystal oscillator characteristics
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
fNOM
Nominal
frequency
–
16/32
–
MHz
fTOL
Frequency
tolerance
Includes initial accuracy, stability over
temperature, aging and frequency pulling
due to incorrect load capacitance.
–
–
±50
ppm
ESR
Equivalent
series
resistance
–
–
100
Ω
PD
Drive level
–
–
100
µW
9.5.1
High speed crystal oscillator
The BlueNRG includes a fully integrated low power 16/32 MHz Xtal oscillator with an
embedded amplitude regulation loop. In order to achieve low power operation and good
frequency stability of the XTAL oscillator, certain considerations with respect to the quartz
load capacitance C0 need to be taken into account. Figure 29: "High speed oscillator block
diagram" shows a simplified block diagram of the amplitude regulated oscillator used on
the BlueNRG-2.



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