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BCM88335L2CUBG 参数 Datasheet PDF下载

BCM88335L2CUBG图片预览
型号: BCM88335L2CUBG
PDF下载: 下载PDF文件 查看货源
内容描述: [Telecom Circuit, 1-Func, PBGA145, WLBGA-145]
分类和应用: 电信电信集成电路
文件页数/大小: 140 页 / 2728 K
品牌: CYPRESS [ CYPRESS ]
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BCM88335 Data Sheet  
Frequency Selection  
Frequency Selection  
Any frequency within the ranges specified for the crystal and TCXO reference may be used. These include not  
only the standard mobile platform reference frequencies of 19.2, 19.8, 24, 26, 33.6, 37.4, and 38.4 MHz, but  
also other frequencies in this range with an approximate resolution of 80 Hz. The BCM88335 must have the  
reference frequency set correctly in order for any of the UART or PCM interfaces to function correctly, since all  
bit timing is derived from the reference frequency.  
Note: The fractional-N synthesizer can support many reference frequencies. However, frequencies  
other than the default require support to be added in the driver plus additional, extensive system  
testing. Contact Broadcom for details.  
The reference frequency for the BCM88335 may be set in the following ways:  
Set the xtalfreq=xxxxx parameter in the nvram.txt file (used to load the driver) to correctly match the crystal  
frequency.  
Autodetect any of the standard handset reference frequencies using an external LPO clock.  
For applications where the reference frequency is one of the standard frequencies commonly used, the  
BCM88335 automatically detects the reference frequency and programs itself to the correct reference  
frequency. In order for automatic frequency detection to work correctly, the BCM88335 must have a valid and  
stable 32.768 kHz LPO clock that meets the requirements listed in Table 3 on page 30 and is present during  
power-on reset.  
Broadcom®  
September 23, 2015 • 88335-DS100-R  
Page 29  
BROADCOM CONFIDENTIAL  
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