2 by 4 line switch?

[[email protected]]

Hi there,

For my microcontroller I'm trying to switch between 2 different devices
that should be using the 4 pin serial port. I'm fine with using a
manual switch but how do I switch between four lines at a time? Most
switches I see are one-way or two way. Is there an IC that does this?
Note, it but be bit directional.

Jevin

 

[flank]

Try a maxim DG408. It is an 8 channel analog multiplexer.

AG

 

[John Fields]

Hi there,

For my microcontroller I'm trying to switch between 2 different devices
that should be using the 4 pin serial port. I'm fine with using a
manual switch but how do I switch between four lines at a time? Most
switches I see are one-way or two way. Is there an IC that does this?
Note, it but be bit directional.

 

[Peter Bennett]

Hi there,

For my microcontroller I'm trying to switch between 2 different devices
that should be using the 4 pin serial port. I'm fine with using a
manual switch but how do I switch between four lines at a time? Most
switches I see are one-way or two way. Is there an IC that does this?
Note, it but be bit directional.

Jevin

Use a four-position rotary switch.

 

[DJ Delorie]

What is, "it but be bit bidirectional" supposed to mean?

Maybe he has a cold?

 

[Chris]

Hi there,

For my microcontroller I'm trying to switch between 2 different devices
that should be using the 4 pin serial port. I'm fine with using a
manual switch but how do I switch between four lines at a time? Most
switches I see are one-way or two way. Is there an IC that does this?
Note, it but be bit directional.

Jevin

Hi, Jevin. Among the many other good suggestions here, you may want to
also consider a 4PDT impulse relay. They're made for phone systems,
and are relatively inexpensive. Most are made with two coils, and on
some, you just reverse the current through the coil to have the relay
pull the other way. Two tiny internal magnets work to keep the relay
contact once coil voltage is removed.

The neat thing about this is that you just have to pulse once, and you
can forget it. They're also made for low voltage/low current
switching, and they're good for an amp -- they'll last forever for
serial stuff unless you're hammering it several times a second.

No matter what you use, don't forget the pulldowns to keep the receiver
port in an acceptable state while the controller is disconnected.

Good luck
Chris

 

[[email protected]]

I've never seen these four pole double throw switches. Are they
common? Any website I could order them from that you know of? I'm in
Canada.

bi-directional. I guess I meant that there are TX/RX pins. That's
all. I don't have a cold though

 

[John Fields]

I've never seen these four pole double throw switches. Are they
common?

---
Yes, fairly.
---

Any website I could order them from that you know of? I'm in
Canada.

www.digikey.com

P/N 7403SYZBE-ND

Mouser probably has them too, but they're too hard to find on their
website. Or maybe it's just me...

 

[Greg Neill]

I've never seen these four pole double throw switches. Are they
common? Any website I could order them from that you know of? I'm in
Canada.

Try Newark:

http://canada.newark.com

They have a number of 4PDT switches according to their website.