Custom PCB for Wi-i.MX53

Embedded Devices
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1

I am working on a project where I am designing a custom PCB for the Wi-i.MX53 module, and am having issues getting the module to boot. I have so far copied the boot selection logic circuit, and the power on circuit. But when the board boots nothing happens on the UART0(Console) pins, I have broken these out to a pin header for ttl access. I can see that the power draw increases when I press the power button on my board, so I assume this part works. I have also put a connector for the parallel display interface, but this yields no results either. The module boots fine in a Jumpstart kit board, with output on both the console UART and the display interface… is there any tricks or appnotes regarding this?

2

can you check if 3.3v is generated on the module?
Here iss a typical scenario for the power-up sequence of ccwimx53. Highlighted is what gets 3.3v generated.

  •          Power On power supply

o VCHRG generated on the board. This is the main supply for the CCWMX53 module.

  •          The PMIC generates the module supplies.

o The +2.775V supply is generated at this point

  •          The CPU is powered and it check the bootstrap to start boot process

  •          [bgcolor=yellow]UBoot sets the PWR_EN signal to enable the external regulators

o The +3.3V supply is generated at this point

  •          The +3.3V and +5V regulators are enabled and the base board is powered[/bgcolor]