What is this electrical symbol?

idbruce

Hello Everyone

I am trying to find the meaning of an electrical symbol.· It is a switch of some sort, and I am 99.99% certain that it is a pushbutton.· Furthermore, I am fairly certain that it is a double pole single throw pushbutton switch.· And considering it's application as shown in the partial schematic below, I am also fairly certain that it is not a momentary switch.· I have searched supply houses and other websites to try and identify this switch, because I intend·to duplicate the full circuit board with some minor modifications, but would like to keep the switches.· If you are interested, the full datasheet can be found at http://www.st.com/stonline/products/literature/an/8607/eval6208n.pdf.· Otherwise the symbol and it's use in a schematic have been attached.

Thanks in advance

Bruce

Duane Degn

I'm pretty sure it's a jumper.

Duane

$WMc%

I think its a 8 pole DIP switch, And the arrows mean one or the other and not both in the group of twos. 8,7 : 6,5 : 4,3 : 2,1

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John R.

The last paragraph on P 33 of the datasheet talks about the functions of the switch. It is a set of 4 slide switches to select the operation of the demo board.

In the picture on P 34, the switches in question are on the left side of the board, to the right of the header, and about half way up. The switch caps are tan, red, orange and yellow, and numbered 1, 2, 3 and 4. I believe these are each a "slide switch".

Boiled down, each pair is a SPDT switch to connect the appropriate resistor to either Ground or "pull up".

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John R.
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Post Edited (John R.) : 8/2/2010 1:17:44 AM GMT

Adrian Schneider

I think it is a 8 x slide switch with 4 mechanically connected pairs of switches like the one in the attached picture.
regards
adrian

idbruce

Thanks for all the replies so far, however I am still sticking to my theory [noparse]:)[/noparse] However, it is true that the circuitry could be replicated with spdt switches.

idbruce

Okay now I believe it is spdt pushbutton

idbruce

Here is one manufacturers representation of a spdt pushbutton

Cluso99

My expectation is that it is a simple 8 DIL Piano Switch. The symbols represent that the switches operate in pairs meaning that only 1 of each switch pairs can be on and the other must be off. So, if you take switch 1 as being on pins 1 & 16 and switch 2 as being pins 2 & 15, then only switch 1 or switch 2 can be on. If switch 1 is on then you select FULL and if switch 2 is on you get HALF. The other 3 pairs work similarly.

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kwinn

Any one of the guesses so far could be correct, and there is no way to be sure without seeing what is actually used. Any spdt switch would work, but imho, using a switch would be overkill and add unnecessary cost to the board. A pin header and jumper plugs make much more sense, and is probably what is actually used.

All of these switches connect to control signals that come from an external source so I would guess that they are used to set the board up for whatever signals are controlling it.

Since the setup is usually done only one time and jumpers cost less than switches I would go with jumpers.

LoopyByteloose

It is an interesting problem. There was a time before digital logic took over that switch schematics were high art. Someone seems to be attempting to revive their role. One really has to read the features the device offers to know why the switch is the way it is.

Obviously, it is 'ganged'. But how much is ganged together - pairs or all eight, would be revealed in a users manual (You would have 4 devices for selection or one).
Functionally, it appears that one contact slides to replace the role of another. In one position, both make contact, but it the other, one contact remains. This leads me to wonder why bother with opening and closing that remaining contact. It could just be poor design with excessive logic. Or, a bad drawing of a simpler switch.

John R. is likely right and it is just lousy graphic presentation.

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Post Edited (Loopy Byteloose) : 8/2/2010 3:25:00 PM GMT

Phil Pilgrim (PhiPi)

It's four independent slide switches, wired SPDT fashion. They are used in the circuit to set the default conditions for CW/CCW, HALF/FULL, CONTROL, and EN. (Note the series resistors, which allow the default conditions to be overridden by the inputs.) One could also implement this with jumpers. You'd use a 4x3 array, with the middle row of four connected to the series resistors, one of the outside rows to Vdd, and the other outside row to Vss. This arrangement prevents any pin from being connected to both Vdd and Vss, which would cause a short. The same cannot be said for a 2x8 array of jumpers, so I'm certain the diagram is not meant to represent jumpers.

-Phil

WBA Consulting

Wow, that's a very poorly drawn symbol for the ugliest 4 way SPDT switch I have ever seen. It actually appears as though each switch itself is 2 SPST switches that are driven by the same actuator, just in opposite directions. For example Pins 1 and 2 are tied together outside the switch.

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Andrew Williams
WBA Consulting
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idbruce

Andrew(WBA Consulting)

I think you have the best answer so far, and you even included a pic of the switch [noparse]:)[/noparse]· I suppose I should have done that!·

I·agree·that it is a four gang spdt switch.· I should have paid better attention to the fact that it is listed as one switch (SW1 in the schematic)·having 16 pins.· Now I say it is a four gang spdt latching (non-momentary) pushbutton switch.

One·thing is·certain, it could be accomplished with jumpers, dip switches, toggles, etc...

I have put in a support request to ST Microelectronics asking them just what the heck it is and for a part number.· It is probably a custom made four gang switch just for that series of evaluation boards.

Once again, I thank everyone·for·their input.· If anybody has a part number for an inexpensive part that would accomplish the same task, I would be very appreciative.· Of course the part should have a small footprint and be pcb mount.

Bruce

Cluso99

Use pin stakes as Phil suggested. You cannot the make a mistake and it is easy and cheap.

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Links to other interesting threads:

· Home of the MultiBladeProps: TriBlade,·RamBlade,·SixBlade, website
· Single Board Computer:·3 Propeller ICs·and a·TriBladeProp board (ZiCog Z80 Emulator)
· Prop Tools under Development or Completed (Index)
· Emulators: CPUs Z80 etc; Micros Altair etc;· Terminals·VT100 etc; (Index) ZiCog (Z80) , MoCog (6809)·
· Prop OS: SphinxOS·, PropDos , PropCmd··· Search the Propeller forums·(uses advanced Google search)
My cruising website is: ·www.bluemagic.biz·· MultiBlade Props: www.cluso.bluemagic.biz

Phil Pilgrim (PhiPi)

Cheaper yet, if you know what you want your default conditions to be, is to skip the switch/headers/jumpers entirely and just wire the "series" resistors as pull-ups/pull-downs. It's clear that the switch is just there to accommodate the needs of an evaluation board. But, if you're actually going to use the chip in an application, it's entirely unnecessary.

-Phil

idbruce

Phil

Yes, that would be the cheapest, but you got to admit, that would change the whole versatility of the board.· I like the whole concept of changing a setting at the push of a button and using less pins on the uProcessor or logic.

Mouser has some nice buttons·at around $8 a pop X (14 boards X 4 buttons per board) = $208

My next choice would be DIP switches or slide switches.

However, I am beginning to think the best solution and cheapest solution for me is the 4X3 array of SIPs.· My only problem is that I hate jumper settings.

Bruce

idbruce

I would like to thank everyone for their input.· Irregardless of·what the symbol actually represents, I have spent too much time trying to find something that I can afford and be happy with, so I have decided to take Phil's advice and use a 4X3 array of SIPs and jumper the settings.· Hopefully I will not become unhappy with this decision.

Bruce

Phil Pilgrim (PhiPi)

Bruce,

Even with the 3x4 header layout, you still have a switch option. For example, four of these will fit the same footprint.

-Phil

idbruce

Phil

LOL· I made a mistake in my math earlier.· It would be $448 for the nice buttons.···As far as your latest response, well that is simply a beautiful solution.· I like it!· I can design the board and still have options!

Thanks Phil I definitely appreciate that.

Bruce

idbruce

Phil

I am also thinking this DIP switch would work (Part #206-124ST) on this data sheet, http://www.ctscorp.com/components/Datasheets/206-208.pdf.· I wish I had one to do a continuity test on.

Bruce