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AM2432...ALV Datasheet(PDF) 144 Page - Texas Instruments

Part # AM2432...ALV
Description  AM243x Sitara™ Microcontrollers
PDF  280 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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AM2432...ALV Datasheet(HTML) 144 Page - Texas Instruments

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7.10.4.1.1 MCU_OSC0 Internal Oscillator Clock Source
Figure 7-17 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
f1
Crystal
Rd
C
f2
(Optional)
Figure 7-17. MCU_OSC0 Crystal Implementation
The crystal must be in the fundamental mode of operation and parallel resonant. Table 7-17 summarizes the
required electrical constraints.
Table 7-17. 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 7-18 details the switching characteristics of the oscillator.
AM2434, AM2432, AM2431
SPRSP65D – APRIL 2021 – REVISED AUGUST 2022
www.ti.com
144
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Copyright © 2022 Texas Instruments Incorporated
Product Folder Links: AM2434 AM2432 AM2431



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