i.MX233 Board not powering up

[sergiososa]

Hello

I have a custom board designed based on the i.MX23 CPU. I am powered from 5V DC without the Battery input, I am unable to powering up

VDDXTAL has 1V, crystal is oscillating at 24Mhz but the DCDC converter is not turning on and also Linregs (VDDIO, VDDA, VDDD, VDDMEM)

I am using the reference design i.MX23 Reference schematic rev C

I need to burn some bit to power up?

How can I debug the startup process?

Thanks for any advise

Sergio Sosa

[igorpadykov]

Hi Sergio

please check attached schematic for 5V only power supply, Design Checklist and

AN4199 Using the i.MX28 Power Management Unit which is applicable to i.MX23 too.

Hardware Design Checklist for i.MX28 

http://www.nxp.com/assets/documents/data/en/application-notes/AN4199.pdf 

Best regards
igor
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[sergiososa]

Thanks Igor

Following the checklist document I found an error on BATT and DCDC_BATERRY, I already fix it and now I have the following voltages in the LinRegs but DCDC Converter not powered yet

VDDIO = 3.2V

VDDA = 1.8V

VDDD = 1.2V

VDDMEM = 0 (for this reason SDRAM also is not powered)

I can access OTP registers using USB conector from my computer using BitBurner Tool (I can read and modify the registers)

I appreciate a lot your help

Sergio Sosa