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OMAP3530 Cold Start Issue

ler
Expert 1070 points
Other Parts Discussed in Thread: OMAP3530

According to Figure 3.3 of the OMAP3530 processor data sheet, from a cold processor start, sys_nreswarm should go high

at the completion of the power up sequence.  We do not see this (it remains) low.  If we hold the reset button down during powerup,

and then release the button, the sys_nreswarm goes high and all is well.  (i.e. warm resets work, cold power up resets do not).  What must we

do to make cold power up resets work?  We are using experimental parts.

 

Also, on a cold power up, we actually see VPP to EFUSE signal goes high before the sys_nrespwron signal.  Is this a problem?  Can

we actually see EFUSE from the G1 pin?

 

Thanks.

 

  • 0
    TI__Guru 64490 points

    Have you had any luck determining the cause of your issue?

    As you describe holding the reset button during powerup, this would have the effect of ensuring all of the power rails are stabilized and the clock inputs to the device are stable prior to releasing the OMAP3530 from reset.
    Have you compared your power, reset and clock inputs via an oscilloscope versus what is indicated in the Data Manual to see if there are noticable differences?

  • 0 in reply to BrandonAzbell
    Expert 1070 points

    I managed to fix the problem by delaying the SYS_nRESPWRON signal using a 1uF capacitor in the circuit.  Presumeably this allows power to be stable prior to release of reset.

    Thanks.