OMAP3530-HiRel datasheet(107/239 Pages) TI

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CLOCK SPECIFICATIONS

OMAP

PowerIC

sys_32k

sys_altclk

sys_clkout1

AlternateClockSourceSelectable(54,48MHzorother[up

to59MHz])

ToQuartz (Oscillatoroutput)orUnconnected

ToQuartz (Oscillatorinput)orSquareClock

ClockRequest.ToSquareClockSourceorfromPeripherals

Oscillator

isUsed

Oscillator

isBypassed

Unconnected

Square

Clock

Source

ToPeripherals (FromOSC_CLK:12,13,16.8,19.2,26,or

38.4MHz,core_clk[DPLL,upto332MHz],DPLL-96MHz

orDPLL-54MHzoutputswithadividerof1,2,4,8,or16)

GPin

ToPeripherals (FromOSC_CLK:12,13,16.8,19.2,26,or

38.4MHz)

sys_clkout2

sys_xtalout

sys_xtalin

sys_clkreq

sys_xtalout

sys_xtalin

sys_clkreq

sys_xtalout

sys_xtalin

sys_clkreq

030-007

OMAP3525-HiRel and OMAP3530-HiRel Applications Processors

www.ti.com

SPRS599 – JUNE 2009

The OMAP3525 and OMAP3530 devices have three external input clocks, a low frequency (sys_32k), a

high frequency (sys_xtalin), and an optional (sys_altclk). The OMAP3525 and OMAP3530 devices haver

two configurable output clocks, sys_clkout1 and sys_clkout2.

Figure 4-1 shows the interface to the external clock sources and clock outputs.

Figure 4-1. Clock Interface

The OMAP3525 and OMAP3530 devices operation requires the following three input clocks:

• The 32-kHz frequency is used for low frequency operation. It supplies the wake-up domain for

operation in lowest power mode (off mode). This clock is provided through the sys_32k pin.

• The system alternative clock can be used (through the sys_altclk pin) to provide alternative 48 or 54

MHz or other clock source (up to 59 MHz).

• The system clock input (12, 13, 16.8, 19.2, 26, or 38.4 MHz) is used to generate the main source clock

of the OMAP3525 and OMAP3530 devices. It supplies the DPLLs as well as several OMAP modules.

The system clock input can be connected to either:

–

A crystal oscillator clock managed by sys_xtalin and sys_xtalout. In this case, the sys_clkreq is

used as an input (GPIN).

–

A CMOS digital clock through the sys_xtalin pin. In this case, the sys_clkreq is used as an output to

request the external system clock.

The OMAP3525 and OMAP3530 outputs externally two clocks:

• sys_clkout1 can output the oscillator clock (12, 13, 16.8, 19.2, 26, or 38.4 MHz) at any time. It can be

controlled by software or externally using sys_clkreq control. When the device is in the off state, the

sys_clkreq can be asserted to enable the oscillator and activate the sys_clkout1 without waking up the

device. The off state polarity of sys_clkout1 is programmable.

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CLOCK SPECIFICATIONS

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OMAP3530-HiRel Datasheet(PDF) 107 Page - Texas Instruments

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