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AM3871 Datasheet(PDF) 186 Page - Texas Instruments

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Part # AM3871
Description  AM387x Sitara ARM Microprocessors (MPUs)
PDF  345 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

AM3871 Datasheet(HTML) 186 Page - Texas Instruments

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AUXOSC_MXI/
AUX_CLKIN
AUXOSC_MXO
C1
C2
Crystal
VSSA_AUXOSC
Rd
(Optional)
(
)
C C
1 2
CL
C
C
1
2
=
+
AM3874, AM3872, AM3871
SPRS695
– SEPTEMBER 2011
www.ti.com
Figure 7-8. Auxiliary Oscillator
The load capacitors, C1 and C2 in the above pictures, 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
MXI, MXO, and VSS pins.
Table 7-11. Input Requirements for Crystal Circuit on the Device Oscillator (DEVOSC)
PARAMETER
MIN
TYP
MAX
UNIT
Start-up time (from power up until oscillating at stable frequency)
4
ms
Crystal Oscillation frequency(1)
20
20
30
MHz
Parallel Load Capacitance (C1 and C2)
12
24
pF
Crystal ESR
50
Ω
Crystal Shunt Capacitance
5
pF
Crystal Oscillation Mode
Fundamental Only
n/a
Crystal Frequency stability
±50
ppm
(1)
20-MHz DEV clock is required for all bootmodes other than Fast XIP. For more detailed information on boot modes, see the ROM Code
Memory and Peripheral Booting chapter of the AM387x Sitara ARM Microprocessors (MPUs) Technical Reference Manual (Literature
Number: SPRUGZ7).
Table 7-12. Input Requirements for Crystal Circuit on the Auxiliary Oscillator (AUXOSC)
PARAMETER
MIN
MAX
UNIT
Start-up time (from power up until oscillating at stable frequency)
4
ms
Crystal Oscillation frequency
20
30
MHz
Parallel Load Capacitance (C1 and C2)
12
24
pF
Crystal ESR
50
Ω
Crystal Shunt Capacitance
5
pF
Crystal Oscillation Mode
Fundamental Only
n/a
Crystal Frequency stability(1)
±50
ppm
(1)
Applies only when sourcing the HDMI or HDVPSS DAC clocks from the AUXOSC
186
Power, Reset, Clocking, and Interrupts
Copyright
© 2011, Texas Instruments Incorporated
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Product Folder Link(s): AM3874 AM3872 AM3871



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