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AM67 Datasheet(PDF) 119 Page - Texas Instruments

Part # AM67
Description  AM67x Processors
PDF  237 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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AM67 Datasheet(HTML) 119 Page - Texas Instruments

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CL=
C C
f1
2
f
(C +C )
f1
f2
J7ES_CL_MATH_03
Figure 6-22. Load Capacitance Equation
The crystal must be in the fundamental mode of operation and parallel resonant. Table 6-25 summarizes the
required electrical constraints.
Table 6-25. WKUP_LFOSC0 Crystal Electrical Characteristics
NAME
DESCRIPTION
MIN
TYP
MAX
UNIT
fp
Parallel resonance crystal frequency
32768
Hz
Crystal Frequency Stability and Tolerance
±100
PPM
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
Cshunt
Shunt capacitance
ESRxtal – 40 kΩ
4
pF
ESRxtal – 60 kΩ
3
pF
ESRxtal – 80 kΩ
2
pF
ESRxtal – 100 kΩ
1
pF
ESR
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 the temperature and aging characteristics of a based
on the worst case environment and expected life expectancy of the system.
Table 6-26 details the switching characteristics of the oscillator and the requirements of the input clock.
Table 6-26. WKUP_LFOSC0 Switching Characteristics – Crystal Mode
NAME
DESCRIPTION
MIN
TYP
MAX
UNIT
fxtal
Oscillation frequency
32768
Hz
tsX
Start-up time
96.5
ms
VDDS_OSC0
WKUP_LFOSC0_XO
t
sX
Time
VSS
VDDS_OSC0 (min.)
VDD_CORE (min.)
VSS
VDD_CORE
LFXOSC_STARTUP_02
Figure 6-23. WKUP_LFOSC0 Start-up Time
www.ti.com
AM67, AM67A
SPRSPA3A – MARCH 2024 – REVISED SEPTEMBER 2024
Copyright © 2024 Texas Instruments Incorporated
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Product Folder Links: AM67 AM67A



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