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AM625 Datasheet(PDF) 119 Page - Texas Instruments

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Part # AM625
Description  AM62x Sitara™ Processors
PDF  255 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

AM625 Datasheet(HTML) 119 Page - Texas Instruments

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Table 7-20. MCU_OSC0 Switching Characteristics - Crystal Mode (continued)
PARAMETER
PACKAGE
MIN
TYP
MAX
UNIT
CXIXO
XI to XO Mutual Capacitance
ALW
0.0114
pF
AMC
0.267
pF
ts
Start-up Time
4
ms
VDDS_OSC0
MCU_OSC0_XO
t
sX
Time
VSS
VDDS_OSC0 (min.)
VDD_CORE (min.)
VSS
VDD_CORE
AM65x_MCU_OSC_STARTUP_02
Figure 7-17. MCU_OSC0 Start-up Time
7.11.4.1.1.1 Load Capacitance
The crystal circuit must be designed such that it applies the appropriate capacitive load to the crystal, as defined
by the crystal manufacturer. The capacitive load, CL, of this circuit is a combination of discrete capacitors
CL1, CL2, and several parasitic contributions. PCB signal traces which connect crystal circuit components to
MCU_OSC0_XI and MCU_OSC0_XO have parasitic capacitance to ground, CPCBXI and CPCBXO, where the
PCB designer should be able to extract parasitic capacitance for each signal trace. The MCU_OSC0 circuits
and device package have combined parasitic capacitance to ground, CPCBXI and CPCBXO, where these parasitic
capacitance values are defined in Table 7-20.
AM65x_MCU_OSC_CC_05
C
PCBXI
C
PCBXO
C
L1
C
L2
PCB
Signal Traces
Crystal Circuit
Components
MCU_OSC0_XO
MCU_OSC0_XI
C
XI
C
XO
Device
Figure 7-18. Load Capacitance
Load capacitors, CL1 and CL2 in Figure 7-16, should be chosen such that the below equation is satisfied. CL in
the equation is the load specified by the crystal manufacturer.
CL = [(CL1 + CPCBXI + CXI) × (CL2 + CPCBXO + CXO)] / [(CL1 + CPCBXI + CXI) + (CL2 + CPCBXO + CXO)]
www.ti.com
AM625, AM623
SPRSP58A – JUNE 2022 – REVISED NOVEMBER 2022
Copyright © 2022 Texas Instruments Incorporated
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Product Folder Links: AM625 AM623



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