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simple voltage level shifter

HI all,

Have a small interface problem, easy cure would be to use a transistor to switch the voltage levels though im wondering if there is a easier way (IE less parts as im limited on space) drive voltage is 4volts, but I need to boost that to 10V or more from a 15V supply rail..

I've been toying with a pullup and using a diode to pull the line down to ground when the IC goes low, problem is when it goes high im forcing the 4V line to 15volts which will probably blow the IC... can't think of any other way apart from to use a small transistor ?

Cheers, Chris

Reply to
exxos
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replying to my own post....

a 11V zener and resistor pullup should in theory do it I think, when the IC is at 4V the zener will drop 11V so it will end up with 4V back on the IC..... thinking of a form of shifter which will just drop to 8volts... anything below 8V is considered low so might able to use that and just use a

4V switch to raise it to around 11V for my logic 1.... might work....

chris

Reply to
exxos

IC

a

You can get some very small surface mount transistors that probably smaller than a leaded zenner...

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1mm x 0.6mm x 0.4mm

Just don't sneeze!

Reply to
CWatters

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Yeah already possible, I don't seem to have a lot of luck with transistor packages like that, resistors, capacitors, QSOP IC's all I can do fine, though when it comes to 3 pin SMT transistors I can never seem to do those, not to good when you have been replacing them for 10 years in SMPSU's either ;-)

*sneezes*

Bah!

Chris :-)

Reply to
exxos

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