Hello,
I am a student making a custom system on a PCB with the imx23 processor. I left my PSWITCH pin as no connect. But i read that it should be pulled to VDD in order for the system to boot up, did i read that right? i read the power-up part in the manual and it lists either a 5V power supply or PSWITCH pull to above 1 v for 100 ms. So do i need to connect PSWITCH to anything?
I have attach my .sch and .brd file, please comment, feeback for improvement greatly appreciated. The files are attached.
problem i faced so far:
1. processor not booting up, 2.5v rail reads 5v,
what is one way to check if processor boot correctly? attached a PC to the USB pins to see if there are any output? or put a serial console on the USB Debug pins?
Hi Anh
PSWITCH is described in sect.32.4 PSWITCH Pin Functions Reference Manual
https://www.nxp.com/docs/en/reference-manual/IMX23RM.pdf
for PSWITCH connections one can check
Schematics (2)
i.MX23 EVK Design Files for Rev C boards: Hardware Schematics, Gerbers,
OrCAD files and System BOM(REV 1.1)
Note, this processor is very old and not supported in nxp software, one can check
third party resources like
usually wrong voltages are caused by brownouts, may be useful to check
(i.MX28 power system is similar to i.MX23)
Brown out issues on ConnectCard (Wi)i.mx28 modules | Digi International
Best regards
igor
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