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SPEAR320S bảng dữ liệu(PDF) 70 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  Embedded MPU with ARM926 core for industrial and consumer applications
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SPEAR320S bảng dữ liệu(HTML) 70 Page - STMicroelectronics

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Electrical characteristics
SPEAr320S
70/113
Doc ID 022508 Rev 2
4.6
Clocking parameters
4.6.1
Master clock (MCLK)
MCLK generated from a crystal oscillator
Figure 4.
MCLK crystal connection
1.
CL1 and CL2 are the load capacitors.
The value of the capacitors depends on the type of the selected crystal. To calculate the
value of the load capacitance, use the formula given below.
Formula
C
L
C
L1
C
L2
×
C
L1
C
L2
+
--------------------------
C
s
+
=
Where CL1 and CL2 are the load capacitors and CS is the circuit stray capacitance.
In our application:
CL1 = CL2 = Cext
Table 40.
MCLK oscillator characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fosc_in
Oscillator frequency
24(1)
1.
A frequency of 24 MHz is mandatory to obtain the required frequencies for all clocks generated by the USB
PLL (PLL3).
33 (2)
2.
At Max freq = 33 MHz the ESR value has to be less than 20
Ω.
MHz
ESR
Equivalent series
resisistance
50
Ω
gm
Oscillator
transconductance
Startup
19.8
28.5
mA/V
tSU
Startup time
Stabilized power on
MCLK_VDD2V5
pin
2 (3)
3.
Startup time simulated with a 30 MHz crystal.
ms
VDD2V5
24 MHz
CL1
CL2
(1)
(1)
MCLK_XI
MCLK_XO



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