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Power down pins on ADS1278

fred price
Prodigy 20 points
Other Parts Discussed in Thread: ADS1278

i'm using the ADS1278. 6 of the channels are being used and 2 are not. i tied the unused pwdn pins for those 2 to gnnd. the other 6 are floating. do they need to be tied high? when i strobe the SYNC pin low, i never get a DRDY signal low.