Hi!
I am using TPS65930 to power-up OMAP3503. I have it connected as recommended by the hardware connectivity document available on TI website. One difference will be the nreswarm signal. No pushbutton there, just a pull-up. I also have a momentary switch on the PWRON signal of TPS65930. When I tried pressing the PWRON pushbutton, the processor stop executing. Upon releasing PWRON, I do not see any nrespwron signal being generated and the software does not boot up. A complete power cycle fix this issue but apparently PWRON just killed the processor and do nothing else. Am I missing something?
Please advise as soon as possible if you can.
Thanks!
Hi,
It is ok to have pull-up on nreswarm. Since this signal will not be pulled low there cannot be a warm reset. What is the PU level?
Do you configure any registers prior to pressing PWRON push button?
Your observation is very strange, can you send your schematics via Brad? I can take a look at that to see whats happening.
Regards,
Gandhar.
PU level on nreswarm is 10K to +1.8VDC and no register in TPS65930 is configured prior to pressing PWRON push button. Brad's email indicated that you did not see anything wrong in my schematics. I have tried several other things at the mean time and I am still getting intermitent failures where software just get stuck after a cold start. I did send an updated email reporting the status and observation to Brad.
Thanks,
Sieow
I am also designing the board with TPS65930 and OMAP3530 processor.
Since nreswarm of processor is bidirectional I/O pin, i have connected to momentary pushbutton switch by considering nreswarm as input and considering nreswarm signal as output and connecting to other peripherals (like TPS65930 and ethernet controller etc.) for reset purpose.Is it OK?
nRESPWRON signal of processor is connected to TPS65930 and momentary pushbutton switch.
My question is
I have implemented voltage supervisor circuit in my board to monitor whether all powers are within the range otherwise it will assert the reset out (low). Where i have to connect this reset out signal?
can i connect to nRESPWRON signal of processor through AND gate or can i connect to nRESWARM signal of processor?
Please help me in this.I am in confusion.
You can connect this to the nrespwron AND input. Keep in mind that if this is done only the processor gets reset. You are not doing anything on the PMIC side and nothing changes on the PMIC configuration. When the OMAP resets it sends nreswarm signal to the PMIC. In case you are using warm reset feature then ensure that the sequence programmed is correct. It is not necessary to use warm reset and in that case there shouldnt be any sequence programmed in memory. If this is the case then toggling nreswarm has no effect.
I have not seen many customers use this configuration.
TPS65930 is the master power provider on your system and as long as the input (VBAT) to the PMIC is good you can expect that the core supplies and other power rails for OMAP and other peripherals should be good.
I hope this helps.
Regards.
Hi Gandhar,
Thanks for your explanation.
I would like to use Warm reset feature in my design since it is a reset out from the OMAP 3530 processor and used to reset the peripherals and PMIC chip. When i am connecting the supervisory reset out to the sys_pwron pin of OMAP processor by using AND gate , you said that PMIC will not get reset.
But my understanding is, since we have connected the warmreset out of processor to PMIC warm reset input pin, if sys_pwron is asserted, it will assert the Warmreset of processor also correct ?
then PMIC will be resetted knowt?
Please let me know whether my understanding is correct?
Murugan.M
Hi Murugan,
if sys_pwron is asserted, it will assert the Warmreset of processor also correct ?
Yes, the PMIC will be reset. However, this is a soft reset and not hard reset. The warm reset sequence is configurable.
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