I have designed a pcb to run the LPC 2129 in the LQFP64(64 pin) package. As the system was too congested i decided to skip the 3.3 Vdda connection believing it to be required only for the ADC as a reference voltage. But the problem now is than on the 2 CAN controllers which i am using CAN1 is working fine while CAN 2 refuses to work. The pins just refuse to drive. There is no fault in the code as the similar code works on the demo board. There is no fault in the circuit or in the connections as i have personally checked all of the wire connections myself. There is no signal on the PINS on the microcontroller. Is this problem due to the non connection of the 3.3 Vdda pin ???