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cc2538 em not powering up through its USB

Other Parts Discussed in Thread: CC2538

hi , 

when I try to power up the cc2538em through its usb without the smartrf06 , the module is not powering up as I tested if the RF is transmitting any data using packet sniffer for contiki program.

secondly when I supply the cc2538 em  with power from a different board  other than smartrf06 ,the RF is transmitting data ,but when i connect any sensor to the ADC channels the AD converted value is not getting processed in the mcu and always shows a constant value on the receiver side , but the same thing works when connected through the smartrf06.

Any help to solve this problem would be greatly appreciated . 

thank you 

Ankith