AM3359 datasheet(112/256 Pages) TI1

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AM335x

(ZCZ Package)

RTC_XTALIN

RTC_XTALOUT

N/C

LVCMOS

Digital

Clock

Source

VSS_RTC

VDDS_RTC

AM335x

(ZCE Package)

RTC_XTALIN

RTC_XTALOUT

N/C

LVCMOS

Digital

Clock

Source

VDDS_RTC

112

AM3359, AM3358, AM3357, AM3356, AM3354, AM3352, AM3351

SPRS717L – OCTOBER 2011 – REVISED MARCH 2020

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Product Folder Links: AM3359 AM3358 AM3357 AM3356 AM3354 AM3352 AM3351

Power and Clocking

(1)

Initial accuracy, temperature drift, and aging effects should be combined when evaluating a reference clock for this requirement.

6.2.2.4

OSC1 LVCMOS Digital Clock Source

Figure 6-15 shows the recommended oscillator connections when OSC1 of the ZCE package is connected

to an LVCMOS square-wave digital clock source and Figure 6-16 shows the recommended oscillator

connections when OSC1 of the ZCZ package is connected to an LVCMOS square-wave digital clock

source. The LVCMOS clock source is connected to the RTC_XTALIN terminal. The ground for the

LVCMOS clock source and VSS_RTC of the ZCZ package should be connected directly to the nearest

PCB digital ground (VSS). In this mode of operation, the RTC_XTALOUT terminal should not be used to

source any external components. The PCB design should provide a mechanism to disconnect the

RTC_XTALOUT terminal from any external components or signal traces that may couple noise into OSC1

through the RTC_XTALOUT terminal.

The RTC_XTALIN terminal has a 10- to 40-kΩ internal pullup resistor which is enabled when OSC1 is

disabled. This internal resistor prevents the RTC_XTALIN terminal from floating to an invalid logic level

which may increase leakage current through the oscillator input buffer.

Figure 6-15. OSC1 (ZCE Package) LVCMOS Circuit Schematic

Figure 6-16. OSC1 (ZCZ Package) LVCMOS Circuit Schematic

Table 6-7. OSC1 LVCMOS Reference Clock Requirements

NAME

DESCRIPTION

MIN

TYP

MAX

UNIT

ƒ(RTC_XTALIN)

Frequency, LVCMOS reference clock

32.768

kHz

Frequency, LVCMOS reference clock

stability and tolerance(1)

Maximum RTC error =

10.512 minutes/year

–20

ppm

Maximum RTC error = 26.28

minutes/year

–50

ppm

tdc(RTC_XTALIN)

Duty cycle, LVCMOS reference clock period

45%

55%

tjpp(RTC_XTALIN)

Jitter peak-to-peak, LVCMOS reference clock period

–1%

tR(RTC_XTALIN)

Time, LVCMOS reference clock rise

tF(RTC_XTALIN)

Time, LVCMOS reference clock fall

AM3359 Datasheet(PDF) 112 Page - Texas Instruments

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