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unused switch pins

 
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tjm215



Joined: 22 Dec 2013
Posts: 17

PostPosted: Wed Dec 09, 2015 12:07 pm    Post subject: unused switch pins Reply with quote

is there a best practice when it comes to unused switch pins? should I tie them to ground via 10k resistor or to 3.3v? or does it make no difference (other than the program number)
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frank



Joined: 19 Oct 2005
Posts: 972

PostPosted: Wed Dec 09, 2015 7:24 pm    Post subject: Reply with quote

All switch pins must be used to select a program so they all must be tied high or low accordingly.
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Frank Thomson
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tjm215



Joined: 22 Dec 2013
Posts: 17

PostPosted: Wed Dec 09, 2015 8:39 pm    Post subject: Reply with quote

so if i tied all to ground would that select program 0?
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ice-nine



Joined: 24 May 2012
Posts: 125

PostPosted: Thu Dec 10, 2015 3:27 am    Post subject: Reply with quote

tjm215 wrote:
so if i tied all to ground would that select program 0?


Yes, S0-2 tied to ground will select program 0,

s0 = lsb

000 = 0
001 = 1
010 = 2
011 = 3
100 = 4

etc
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