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AM652X 데이터시트(PDF) 144 Page - Texas Instruments

부품명 AM652X
상세설명  Sitara Processors
PDF  299 Pages
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제조업체  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
Logo TI1 - Texas Instruments

AM652X 데이터시트(HTML) 144 Page - Texas Instruments

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CL=
C C
f1
2
f
(C +C )
f1
f2
SPRS932_CLOCK_03
Device
OSC1_XO
OSC1_XI
C
f1
Crystal
Rd
C
f2
(Optional)
SPRSP08_PCB_CLK_OSC_1
Rbias
(Optional)
PCB Ground
144
AM6548, AM6528, AM6546
AM6526, AM6527
SPRSP08E – NOVEMBER 2017 – REVISED OCTOBER 2018
www.ti.com
Submit Documentation Feedback
Product Folder Links: AM6548 AM6528 AM6546 AM6526 AM6527
Specifications
Copyright © 2017–2018, Texas Instruments Incorporated
5.11.4.1.3 Auxiliary OSC1 Internal Oscillator Clock Source
Figure 5-15 shows the recommended crystal circuit. It is recommended that preproduction printed-circuit
board (PCB) designs include the two optional resistors Rbias and Rd in case they are required for proper
oscillator operation when combined with production crystal circuit components. In most cases, Rbias is not
required and Rd is a 0-Ω resistor. These resistors may be removed from production PCB designs after
evaluating oscillator performance with production crystal circuit components installed on preproduction
PCBs.
Figure 5-15. OSC1 Crystal Implementation
NOTE
The load capacitors, Cf1 and Cf2 in Figure 5-16, should be chosen such that the below
equation is satisfied. CL in the equation is the load specified by the crystal manufacturer. All
discrete components used to implement the oscillator circuit should be placed as close as
possible to the associated oscillator OSC1_XI, OSC1_XO, and VSS pins.
Figure 5-16. Load Capacitance Equation
The crystal must be in the fundamental mode of operation and parallel resonant. Table 5-20 summarizes
the required electrical constraints.
Table 5-20. OSC1 Crystal Electrical Characteristics
NAME
DESCRIPTION
MIN
TYP
MAX
UNIT
fp
Parallel resonance crystal frequency
19.2, 20, 24, 25, 26, 27
MHz
Cf1
Cf1 load capacitance for crystal parallel resonance with Cf1 = Cf2
12
24
pF
Cf2
Cf2 load capacitance for crystal parallel resonance with Cf1 = Cf2
12
24
pF
ESR(Cf1,Cf2)
Crystal ESR
100
Ω



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