OMAP3515DCUS Datasheet, PDF (129/264 Pages) Texas Instruments – OMAP3515 and OMAP3503 Applications Processors

OMAP3515, OMAP3503
www.ti.com
SPRS505H – FEBRUARY 2008 – REVISED OCTOBER 2013
3.6 Power-up and Power-down
This section provides the timing requirements for the OMAP3515/03 hardware signals.
3.6.1 Power-up Sequence
The following steps give an example of power-up sequence supported by the OMAP3515/03 device.
1. vdds and vdds_mem are ramped ensuring a level on the IO domain and sys_nrespwron must be low.
At the same time, vdds_sram and vdds_wkup_bg can also be ramped.
2. Once vdds_wkup_bg rail is stabilized, vdd_core can be ramped.
3. Once vdd_core is stabilized, then vdd_mpu can be ramped.
4. vdds_dpll_dll and vdds_dpll_per rails can be ramped at any time during the above sequence.
5. sys_nrespwron can be released as soon as the vdds_pll_dll rail is stabilized, and sys_xtalin and
sys_32k clocks are stabilized.
6. During the whole sequence above, sys_nreswarm is held low by OMAP3515/03. sys_nreswarm is
released after the eFuse check has been performed; that is, after sys_nrespwron is released.
7. The other power supplies can then be turned on upon software request.
shows the power-up sequence.
Notes:
• If an external square clock is provided, it could be started after sys_nrespwron release provided it is
clean: no glitch, stable frequency, and duty cycle.
• Higher voltage can be used. OPP voltage values may change following the silicon characterization
result.
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ELECTRICAL CHARACTERISTICS 129
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