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AM62A7 датащи(PDF) 109 Page - Texas Instruments

номер детали AM62A7
подробное описание детали  AM62Ax Sitara™ Processors
PDF  238 Pages
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AM62A7 датащи(HTML) 109 Page - Texas Instruments

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7.10.4.1.1 MCU_OSC0 Internal Oscillator Clock Source
Figure 7-16 shows the recommended crystal circuit. All discrete components used to implement the oscillator
circuit must be placed as close as possible to the MCU_OSC0_XI and MCU_OSC0_XO pins.
Device
MCU_OSC0_XO
MCU_OSC0_XI
C
L1
Crystal
C
L2
AM65x_MCU_OSC_INT_01
PCB Ground
Figure 7-16. MCU_OSC0 Crystal Implementation
The crystal must be in the fundamental mode of operation and parallel resonant. Table 7-21 summarizes the
required electrical constraints.
Table 7-21. MCU_OSC0 Crystal Circuit Requirements
PARAMETER
MIN
TYP
MAX
UNIT
Fxtal
Crystal Parallel Resonance Frequency
25
MHz
Fxtal
Crystal Frequency Stability and Tolerance
Ethernet RGMII and RMII
not used
±100
ppm
Ethernet RGMII and RMII
using derived clock
±50
CL1+PCBXI
Capacitance of CL1 + CPCBXI
12
24
pF
CL2+PCBXO
Capacitance of CL2 + CPCBXO
12
24
pF
CL
Crystal Load Capacitance
6
12
pF
Cshunt
Crystal Circuit Shunt Capacitance
ESRxtal = 30 Ω
25 MHz
7
pF
ESRxtal = 40 Ω
25 MHz
5
pF
ESRxtal = 50 Ω
25 MHz
5
pF
ESRxtal
Crystal Effective Series Resistance
(1)
Ω
(1)
The maximum ESR of the crystal is a function of the crystal frequency and shunt capacitance. See the Cshunt parameter.
When selecting a crystal, the system design must consider temperature and aging characteristics of the crystal
based on worst case environment and expected life expectancy of the system.
Table 7-22 details the switching characteristics of the oscillator.
Table 7-22. MCU_OSC0 Switching Characteristics - Crystal Mode
PARAMETER
MIN
TYP
MAX
UNIT
CXI
XI Capacitance
2.04
pF
CXO
XO Capacitance
1.91
pF
CXIXO
XI to XO Mutual Capacitance
0.01
pF
www.ti.com
AM62A7, AM62A7-Q1, AM62A3, AM62A3-Q1
SPRSP77A – MARCH 2023 – REVISED AUGUST 2023
Copyright © 2023 Texas Instruments Incorporated
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Product Folder Links: AM62A7 AM62A7-Q1 AM62A3 AM62A3-Q1



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