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CC2510F8RSP 参数 Datasheet PDF下载

CC2510F8RSP图片预览
型号: CC2510F8RSP
PDF下载: 下载PDF文件 查看货源
内容描述: 低功耗的SoC (系统级芯片)与MCU,存储器, 2.4 GHz射频收发器和USB控制器 [Low-Power SoC (System-on-Chip) with MCU, Memory, 2.4 GHz RF Transceiver, and USB Controller]
分类和应用: 存储射频控制器
文件页数/大小: 244 页 / 2899 K
品牌: TAOS [ TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS ]
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C2510Fx / CC2511Fx  
10.3 Crystal  
The loading capacitor values depend on the  
total load capacitance, CL, specified for the  
crystal. The total load capacitance seen  
between the crystal terminals should equal CL  
for the crystal to oscillate at the specified  
frequency. For the CC2510Fx using the crystal  
X1, the load capacitance CL is given as:  
The crystal oscillator for the CC2510Fx uses an  
external crystal X1, with two loading capacitors  
(C201 and C211).  
The CC2511Fx should use  
a
48 MHz  
fundamental (X3) or a 48 MHz 3rd overtone low  
cost external crystal (X4). Depending on the  
option selected, different loading capacitors  
(C203 and C214 or C202, C212, and C213)  
must be used. When X4 is used, an inductor  
(L281) must also be connected in series with  
C212.  
1
CL =  
+ CParasitic  
1
1
+
C211 C201  
The parasitic capacitance is constituted by pin  
input capacitance and PCB stray capacitance.  
Total parasitic capacitance is typically 2.5 pF.  
Note: The high speed crystal oscillator  
must be stable (SLEEP.XOSC_STB=1)  
before using the radio.  
The crystal oscillator is amplitude regulated.  
This means that a high current is used to start  
up the oscillations. When the amplitude builds  
up, the current is reduced to what is necessary  
to maintain approximately 0.4 Vpp signal  
swing. This ensures a fast start-up, and keeps  
the drive level to a minimum. The ESR of the  
crystal should be within the specification in  
order to ensure a reliable start-up  
The recommended application circuits also  
show the connections for an optional 32.768  
kHz crystal oscillator with external crystal X2  
and loading capacitors C181 and C171. This  
crystal can be used by the Sleep Timer if more  
accurate wake-up intervals are needed than  
what the internal RC oscillator can provide.  
When not using X2, P2_3 and P2_4 may be  
used as general IO pins.  
10.4 USB (CC2511Fx)  
the pull-up resistor does not provide current to  
the D+ line when VBUS is removed. The pull-up  
resistor may be connected directly between  
VBUS and the D+ line. As an alternative, if the  
CC2511Fx firmware needs the ability to  
disconnect from the USB bus, an I/O pin on  
the CC2511Fx can be used to control the pull-up  
resistor.  
For the CC2511Fx, the DP and DM pins need  
series resistors R262 and R263 for impedance  
matching and the D+ line must have a pull-up  
resistor, R264. The series resistors should  
match the 90  
±15% characteristic  
impedance of the USB bus.  
Notice that the pull-up resistor must be tied to  
a voltage source between 3.0 and 3.6 V  
(typically 3.3 V). The voltage source must be  
derived from or controlled by the VBUS power  
supply provided by the USB cable. In this way,  
10.5 Power Supply Decoupling  
The power supply must be properly decoupled  
close to the supply pins. Note that decoupling  
capacitors are not shown in the application  
circuit. The placement and the size of the  
decoupling capacitors are very important to  
achieve the optimum performance. TI provides  
reference designs that should be followed  
closely ([1] and [2]).  
SWRS055D  
Page 34 of 243