BLUENRG-2 datasheet(174/190 Pages) STMICROELECTRONICS

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BLUENRG-2 데이터시트(PDF) 174 Page - STMicroelectronics

부품명	BLUENRG-2

상세설명	Bluetooth® low energy wireless system-on-chip

PDF	190 Pages

Scroll/Zoom	100%

제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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174 / 190 page

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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