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SPEAR1340 датащи(PDF) 134 Page - STMicroelectronics

номер детали SPEAR1340
подробное описание детали  Dual-core Cortex A9 HMI embedded MPU
PDF  200 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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SPEAR1340 датащи(HTML) 134 Page - STMicroelectronics

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Electrical characteristics
SPEAr1340
134/200
Doc ID 023063 Rev 4
4.3
Clocking parameters
4.3.1
Master clock (MCLK)
External clock generated from a crystal oscillator
Figure 7.
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.
For this example, Aker C2E-24.000-12-3030-X 24 MHz oscillator has been used.
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 42.
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 PLL
of the USB PHY.
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_AVDD3V3
pin
2 (3)
3.
Startup time simulated with a 30 MHz crystal.
ms
VDD3v3
24 MHz
CL1
CL2
(1)
(1)
MCLK_XI
MCLK_XO



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