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OMAP3530ECBBA 数据表(PDF) 134 Page - Texas Instruments |
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OMAP3530ECBBA 数据表(HTML) 134 Page - Texas Instruments |
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134 / 265 page  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 OMAP3530, OMAP3525 SPRS507H – FEBRUARY 2008 – REVISED OCTOBER 2013 www.ti.com 4 CLOCK SPECIFICATIONS The OMAP3530/25 device has three external input clocks, a low frequency (sys_32k), a high frequency (sys_xtalin), and an optional (sys_altclk). The OMAP3530/25 device has 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 OMAP3530/25 device 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 OMAP3530/25 device. 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 OMAP3530/25 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. 134 CLOCK SPECIFICATIONS Copyright © 2008–2013, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: OMAP3530 OMAP3525 |
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