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Topic: Need advice on powering lots of chips (Read 1 time) previous topic - next topic

vasquo

Both grounds will still have to be joined somewhere. Choose a single common point where the "bridge" should be.

Power bypass caps on EVERYTHING, positioned as close as possible to the chip's power pins.

MarkT

Can we clarify if ground for the 4051's means Vss or Vee?
[ I won't respond to messages, use the forum please ]

CrossRoads

Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

MarkT


http://www.ti.com/lit/ds/symlink/cd74hc4051.pdf

Vee would be Gnd per TI's datasheet.


They call Vss ground, not Vee.  We are talking about the CD4051, not the 74HC4051 though - there will
possibly be differences in thresholds.

I'm not sure you can reliably drive the control inputs from 5V when Vdd is 9V, it would be more common
for Vee = -5V, Vss=gnd=0V, Vdd=+5V from what I understand.
[ I won't respond to messages, use the forum please ]

CrossRoads

Yes, unless you were running from a single supply. Then Vee = Gnd.
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

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