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BLUENRG-2 Datasheet(PDF) 174 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) 174 Page - STMicroelectronics

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Electrical specifications
BlueNRG-2
174/190
DocID030675 Rev 2
Figure 29: High speed oscillator block diagram
Low power consumption and fast startup time is achieved by choosing a quartz crystal with
a low load capacitance C0. A reasonable choice for capacitor C0 is 12 pF. To achieve good
frequency stability, the following equation needs to be satisfied:
∁0=
∁1′ ∗ ∁2′
∁1 + ∁2
Where C1
’=C1+CPCB1+CPAD, C2’= C2+CPCB2+CPAD, where C1 and C2 are external (SMD)
components, CPCB1 and CPCB2 are PCB routing parasites and CPAD is the equivalent small-
signal pad-capacitance. The value of CPAD is around 0.5 pF for each pad. The routing
parasites should be minimized by placing quartz and C1/C2 capacitors close to the chip, not



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