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DRA821U4...ALM 数据表(PDF) 137 Page - Texas Instruments

部件名 DRA821U4...ALM
功能描述  DRA821 Jacinto™ Processors
PDF  252 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

DRA821U4...ALM 数据表(HTML) 137 Page - Texas Instruments

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Note
A DC steady-state condition is not allowed on WKUP_OSC0_XI when the oscillator is powered up.
This is not allowed because WKUP_OSC0_XI is internally AC coupled to a comparator that may enter
a unknown state when DC is applied to the input. Therefore, application software should power down
WKUP_OSC0 any time WKUP_OSC0_XI is not toggling between logic states.
WKUP_OSC0_XO
Device
WKUP_OSC0_XI
J7VC_LF_OSC_INT_12
PCB Ground
Figure 7-28. 1.8-V LVCMOS-Compatible Clock Input
7.9.4.1.3 Auxiliary OSC1 Internal Oscillator Clock Source
Figure 7-29 shows the recommended crystal circuit. All discrete components used to implement the oscillator
circuit should be placed as close as possible to the OSC1_XI and OSC1_XO pins.
Device
OSC1_XO
OSC1_XI
C
f1
Crystal
C
f2
J7ES_AUX_OSC_INT_07
PCB Ground
Figure 7-29. OSC1 Crystal Implementation
The crystal must be in the fundamental mode of operation and parallel resonant. Table 7-22 summarizes the
required electrical constraints.
www.ti.com
DRA821U-Q1
SPRSP57D – APRIL 2020 – REVISED DECEMBER 2022
Copyright © 2022 Texas Instruments Incorporated
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