BCM20707 Datasheet, PDF (22/65 Pages) Cypress Semiconductor – Complies with Bluetooth Core Specification version 4.2 including BR/EDR/BLE

BCM20707 Preliminary Data Sheet
Clock Frequencies
Clock Frequencies
The BCM20707 49-pin FBGA package supports 20, 24, and 40 MHz crystals (XTAL) by selecting the correct
crystal strapping options. Other frequencies also supported by firmware configuration. Table 4 lists the strapping
options.
Table 4: Crystal Strapping Options for the 49-Pin FBGA Package
Strapping Option Pin
BT_XTAL_STRAP_1 BT_XTAL_STRAP_0
Pull Low
Pull Low
Pull High
Pull High
Pull Low
Pull High
Pull Low
Pull High
XTAL Frequency
40 Mhz
24 MHz
20 MHz
Read from serial flash or EEPROM
Note: Only the Read from Serial flash or EEPROM option is available for the 36-pin WLBGA package.
The strapping is set internally in the package.
Crystal Oscillator
The XTAL must have an accuracy of ±20 ppm as defined by the Bluetooth specification. Two external load
capacitors in the range of 5 pF to 30 pF are required to work with the crystal oscillator. The selection of the load
capacitors is XTAL-dependent (see Figure 4).
Figure 4: Recommended Oscillator Configuration—12 pF Load Crystal
22 pF
20 pF
Crystal
XIN
XOUT
Broadcom^®
May 27, 2016 • 20707-DS206-R
BROADCOM CONFIDENTIAL
Bluetooth SoC
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