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'[EE:] From 3V to 5V (level shifter)'
2004\04\27@145217 by Omer YALHI

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I am in need of a level shifter from 3V to 5V.  I have searched the archives
and came up with a 3V to 5V transceiver from TI - SNLVCC4245A.  This comes
in a nice TSSOP package and it has 8 bit translation.  However, I only need
to shift 1 bit and the board space is really small (11mm or 0.43 inch
diameter circle).  I am converting pulses from a 3V hall sensor to a 5V reed
relay.  The maximum number of pulses received will be 30 in 1 second.  Any
suggestions or ideas that come to mind?

Thanks,

Omer


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2004\04\27@150632 by David Challis

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How about the MAX3372 series billed by Maxim as "The worlds smallest level
translator"?
www.maxim-ic.com/quick_view2.cfm?qv_pk=3253
Or the MAX3370, one level translator in a SC70 package.
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2389

Regards,

Dave Challis

{Original Message removed}

2004\04\27@154412 by Spehro Pefhany

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At 09:54 PM 4/27/2004 +0300, you wrote:
>I am in need of a level shifter from 3V to 5V.  I have searched the archives
>and came up with a 3V to 5V transceiver from TI - SNLVCC4245A.  This comes
>in a nice TSSOP package and it has 8 bit translation.  However, I only need
>to shift 1 bit and the board space is really small (11mm or 0.43 inch
>diameter circle).  I am converting pulses from a 3V hall sensor to a 5V reed
>relay.  The maximum number of pulses received will be 30 in 1 second.  Any
>suggestions or ideas that come to mind?
>
>Thanks,

You just want to run a 5V reed relay with a 3V signal?

Use a FDV303N and put a little SMT diode across the coil.

Best regards,

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2004\04\27@154956 by Harold Hallikainen

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I've recently designed in some level translators from Maxim
(http://www.maxim-ic.com). However, if you are just driving a reed relay
from 3V logic, how about either a FET or a BJT driven by the 3V logic?

Harold

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2004\04\27@155204 by Omer YALHI

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Dave,

You are a life saver.  I have wasted a whole day searching for such a
product (also did other stuff too), came up with 3372, but no one carried
them.  Just for luck Newark carries the 3370, which works out just fine.

Thank you,

Omer

{Original Message removed}

2004\04\27@160110 by David Challis

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Omer,

Sometimes Maxim parts are hard to find through the normal catalog
distribution channels (Newark, Digikey, Mouser, etc).  I've had good luck
ordering directly from Maxim's website, although occasionally the lead time
can be 3 weeks or more on the more obscure parts.  Also, if you only need a
few parts, Maxim's free sample program works fairly well.

Good luck,

Dave

{Original Message removed}

2004\04\27@164052 by Omer YALHI

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As suggested, other solutions might exist.  However, I am not very good with
FETs, that is why I have been searching for an IC solution.
Thank you each one of you for taking the time and answering.

Regards,

Omer

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2004\04\27@221940 by Russell McMahon

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> >I am in need of a level shifter from 3V to 5V.  I have searched the
archives
> >and came up with a 3V to 5V transceiver from TI - SNLVCC4245A.  This
comes
> >in a nice TSSOP package and it has 8 bit translation.  However, I only
need
> >to shift 1 bit and the board space is really small (11mm or 0.43 inch
> >diameter circle).  I am converting pulses from a 3V hall sensor to a 5V
reed
> >relay.  The maximum number of pulses received will be 30 in 1 second.
Any
> >suggestions or ideas that come to mind?

> You just want to run a 5V reed relay with a 3V signal?
> Use a FDV303N and put a little SMT diode across the coil.

I'd try to use the 3v if possible as is.

You don't say if the load (relay) can be ground or supply referenced.
If it has one lead connected to supply.

1.    For high = on.
Use a transistor inverter. NPN. Emitter to ground. collector to relay. Input
to base via resistor

2.    Low = on.
NPN transistor.
Collector to relay.
Base to +3v via a resistor (say 10k)
Input to emitter.
This does require that the relay load current is carried by the input
circuit BUT the input voltage is isolated from the relay voltage.


   RM

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2004\04\28@112509 by Dwayne Reid

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At 12:54 PM 4/27/2004, Omer YALHI wrote:

>I am converting pulses from a 3V hall sensor to a 5V reed
>relay.  The maximum number of pulses received will be 30 in 1 second.  Any
>suggestions or ideas that come to mind?

What sensor are you using?  Why is it at 3V?  Is the only load going to be
this 5V reed relay?  How much current does the relay draw?

Can you do a simple ASCII sketch of your hall effect circuit?

I see several easy solutions depending upon what you tell us.

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2004\04\28@162149 by Omer YALHI

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Dwayne said:
>What sensor are you using?  Why is it at 3V?  Is the only
>load going to be this 5V reed relay?  How much current
>does the relay draw?

>Can you do a simple ASCII sketch of your hall effect circuit?

>I see several easy solutions depending upon what you tell us.


I have the allegro 3209 which runs at 3V and although there are numoreous
hall sensors this is the only one working for me.  The hall needs to give
pulse on any magnet pole N or S and no signal when there is no magnet (I
think it is called omnipolar).  If I could find the same sensor running at
5V another problem would arise as I need to run this circuit from either a
3V or 5V supply.

The hall sensor is powered from 3V, the open drain output is connected to
the + side of the reed relay (of course the relay needs 5V and it does not
work with this setup), the - side of the relay goes to ground.  This is the
basic circuit.

Eventually what I am trying to accomplish is that convert the hall sensor
output to a reed relay output and be able to run the circuit from either 3V
or 5V without any jumpers etc.

Any ideas is appriciated,

Regards,

Omer

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2004\04\28@205211 by Russell McMahon

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> I have the allegro 3209 which runs at 3V and although there are numoreous
> hall sensors this is the only one working for me.  The hall needs to give
> pulse on any magnet pole N or S and no signal when there is no magnet (I
> think it is called omnipolar).  If I could find the same sensor running at
> 5V another problem would arise as I need to run this circuit from either a
> 3V or 5V supply.
>
> The hall sensor is powered from 3V, the open drain output is connected to
> the + side of the reed relay (of course the relay needs 5V and it does not
> work with this setup), the - side of the relay goes to ground.  This is
the
> basic circuit.

You can do this with 1 transistor and 1 resistor. Size would be minimal
Works for any reed relay voltage you wish to use .

PNP
Emitter to V+
Base via resistor to hall sensor output
Collector to reed relay (say 10k to 100k)
The ultra cautious might add a 1M resistor from base to V+ but it will work
without it.

Only caveat is that the hall sensor open collector needs to be able to
withstand the supply voltage used by the reed relay.
The 3209 is actually rated at 5v abs max on the output and they don't give a
normal operating voltage. Adding a zener of at least 2 volts rating in the
hall sensor output (anode to hall sensor output) would make it safer. Or a
few diodes facing in the opposite direction.
Add one more R and an NPN and you have a bullet proof design and still very
compact using SM parts (2 resistors, 2 transistors). A dual npn/pnp may be
available.




       RM

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2004\04\29@082852 by Russell McMahon

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part 1 2650 bytes content-type:text/plain; (decoded 7bit)

> The hall sensor is powered from 3V, the open drain output is connected to
> the + side of the reed relay (of course the relay needs 5V and it does not
> work with this setup), the - side of the relay goes to ground.  This is
the
> basic circuit.
>
> Eventually what I am trying to accomplish is that convert the hall sensor
> output to a reed relay output and be able to run the circuit from either
3V
> or 5V without any jumpers etc.



The attached diagram shows a simple way to meet most of your specification.
The final details can be met with a few simple additions depending on what
you REALLY want.

Specs:

- Hall sensor runs on 3v if desired
- Relay runs on 3v if a 3v relay or 5v if a 5v relay or as high as you want
if you want.
- Relay has one end grounded.
- Relay operates when hall sensor output is low.
- Hall sensor has open collector output.

N1 is almost any cheap npn and P1 almost any cheap pnp.
Voltage and current ratings will probably be easily met by almost anything.

N1 is connected unusually. This is to keep the phase correct so the circuit
turns on then hall output is low.
Follow circuit operation through and you will see it is not doing anything
weird.

The main job of n1 is to isolate the hall sensor from the higher voltage
supply.

N1 must pass all base current of P1 but that is minimal.

IF the whole circuit must run off 5v only then a simple zener/resistor
regulator can power the hall cell.
As the hall cell can operate off 2.5V  to 3.5 V supply (see data sheet) you
could use either a low dropout regulator or a zener resistor supply that
will work ok from both 3v and 5v.

The prudent or paranoid may consider an extra resistor from P1 base to 5v
and perhaps from N1 emitter to 3v but the circuit will work as shown.

Size of circuit proper is modest. Two transistors and 2 resistors. SMD or
through hole is still small.

Power supply if needed is a regulator or a resistor and a zener. Power
supply decoupling cap may be needed depending on regulator.

If this is still not enough detail I can complete the design to your precise
spec for some $$$ :-)
I suspect you have enough here though to allow a complete solution.

The 3209 is a lovely device - and the 3210 even nicer (lower supply current
by far).
The dual magnetic polarity triggering is also very useful. Considered using
one of these for an application once but specification changed so the
features were not needed.


       Russell McMahon



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part 2 2627 bytes content-type:image/gif; (decode)

2004\04\29@101311 by Spehro Pefhany

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At 12:28 AM 4/30/2004 +1200, you wrote:


>The attached diagram shows a simple way to meet most of your specification.
>The final details can be met with a few simple additions depending on what
>you REALLY want.

(snippage of much good stuff)

You might want a diode or series diode + zener across the reed relay coil.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
.....speffKILLspamspam.....interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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