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AM5728 Datasheet(PDF) 205 Page - Texas Instruments

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Part # AM5728
Description  Sitara Processors Silicon Revision 2.0
PDF  415 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

AM5728 Datasheet(HTML) 205 Page - Texas Instruments

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CL=
C C
f1
2
f
(C +C )
2
f1
f
Device
rtc_osc_xo
rtc_osc_xi_clkin32
C
f1
Crystal
Rd
C
f2
(Optional)
205
AM5729, AM5728, AM5726
www.ti.com
SPRS953F – DECEMBER 2015 – REVISED MAY 2019
Submit Documentation Feedback
Product Folder Links: AM5729 AM5728 AM5726
Clock Specifications
Copyright © 2015–2019, Texas Instruments Incorporated
Figure 6-10. Crystal Implementation
NOTE
The load capacitors, Cf1 and Cf2 in Figure 6-10, 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 rtc_osc_xi_clkin32 and rtc_osc_xo pins.
Figure 6-11. Load Capacitance Equation
The crystal must be in the fundamental mode of operation and parallel resonant. Table 6-9 summarizes
the required electrical constraints.
Table 6-9. RTC Crystal Electrical Characteristics
NAME
DESCRIPTION
MIN
TYP
MAX
UNIT
fp
Parallel resonance crystal frequency
32.768
kHz
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
80
kΩ
CO
Crystal shunt capacitance
5
pF
LM
Crystal motional inductance for fp = 32.768 kHz
10.7
mH
CM
Crystal motional capacitance
2.2
fF
tj(rtc_osc_xi_clkin32)
Frequency accuracy, rtc_osc_xi_clkin32
±200
ppm
When selecting a crystal, the system design must take into account the temperature and aging
characteristics of a crystal versus the user environment and expected lifetime of the system.
Table 6-10 details the switching characteristics of the oscillator and the requirements of the input clock.
Table 6-10. Oscillator Switching Characteristics—Crystal Mode
NAME
DESCRIPTION
MIN
TYP
MAX
UNIT
fp
Oscillation frequency
32.768
kHz
tsX
Start-up time
4
ms



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