the Level shifter is from 5V to 1.8V; that is High: 5V–>1.8V Low: 0V–>0V
but the schematics P3449 -Page16; MMBT3904LP-7 is a NPN, the logic will be : High: 5V–>0V Low: 0V–>1.8V
in the P3449 carrier board，the schematics design is wrong or not? where I can download the P3450 carrier board schematics?
thnaks