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Query on PF3001 and PF3000 related circuit

Question asked by vineeth113 754 on Jan 28, 2017
Latest reply on Feb 1, 2017 by Yuri Muhin


I have below queries on PF3001 and PF3000 circuit

1. The PF3001 and PF3000 are footprint compatible. But the some pin assignments are different.

    In PF3001 the 24,25th pins are GND and NC

    In PF3000 the 24,25th pins are VREFDDR and  VINREFDDR.

So how VREFDDR is generated in the PF3001 if we are not using resistor divider circuit. 

2.  As observed in datasheet of PF3001 24th pin is GND and in PF3000 VINREFDDR so as observed in schematics when we are mounting PF3001 24 pin will be supplied by voltage rail  DRAM_1V35(SW3 output). Please clarify.