參數(shù)資料
型號: TMX320VC5509AGHH
廠商: Texas Instruments, Inc.
元件分類: 數(shù)字信號處理
英文描述: TMS320VC5509A Fixed-Point Digital Signal Processor
中文描述: TMS320VC5509A定點(diǎn)數(shù)字信號處理器
文件頁數(shù): 92/144頁
文件大?。?/td> 1603K
代理商: TMX320VC5509AGHH
Electrical Specifications
92
November 2002 Revised January 2005
SPRS205D
C1
C3
C2
C12
C4
C9
C8
C6
C7
X2/CLKIN
CLKOUT
Bypass Mode
C10
C11
NOTE A: The relationship of X2/CLKIN to CLKOUT depends on the PLL multiply and divide factor chosen for the CLKMD register. The waveform
relationship shown in Figure 53 is intended to illustrate the timing parameters based on CLKOUT = 1xCLKIN configuration.
Figure 54. External Multiply-by-N Clock Timings
5.6.5 Real-Time Clock Oscillator With External Crystal
The real-time clock module includes an oscillator circuit. The oscillator requires an external 32.768-kHz crystal
connected across the RTCINX1 and RTCINX2 pins. The connection of the required circuit, consisting of the
crystal and two load capacitors, is shown in Figure 55. The load capacitors, C
1
and C
2
, should be chosen
such that the equation below is satisfied. C
L
in the equation is the load specified for the crystal.
C
L
C
1
C
2
(
C
1
C
2
)
RTCINX1
RTCINX2
C1
C2
32.768 kHz
Crystal
Figure 55. Real-Time Clock Oscillator With External Crystal
NOTE:
The RTC can be idled by not supplying its 32-kHz oscillator signal. In order to keep
RTC power dissipation to a minimum when the RTC module is not used, it is recommended
that the RTC module be powered up, the RTC input pin (RTCINX1) be pulled low, and the RTC
output pin (RTCINX2) be left floating.
Table 56. Recommended RTC Crystal Parameters
PARAMETER
MIN
NOM
MAX
UNIT
f
o
Frequency of oscillation
32.768
kHz
ESR
Series resistance
30
60
k
C
L
Load capacitance
12.5
pF
DL
ESR must be 200 k
or greater at frequencies other than 32.768kHz. Otherwise, oscillations at overtone frequencies may occur.
Crystal drive level
1
μ
W
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