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control 7v device by 3.3 voltage logic

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whiteshirtee

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I want to use PLD to control a switch. the output voltage of the PLD is only 3.3V, but the switch needs 7V signal to control it.
How can I use this PLD to control the switch?
Is there any method to transfer 3.3v logic to 7v logic?
If it can, tell me what the chip or device is, please!

Thanks a lot!
 

kanagavel_docs

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Hi,


You can use tri-state logic and add pullup with 7V VCC. Instead of driving '1' drive 'z'.


Regards,
Kanags
 

whiteshirtee

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Thanks. I have never use tri-stae logic. could you give me some advice specificly?
 

kanagavel_docs

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Hi,

If you are using verilog statement like

out_tri = (!out_signal) ? 1'b0 : 1'bz;

the synthesis tool will infer tristate buffer in the output.

Regards,
Kanagavel. S
 

necolei

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what you can do is to make a simple transistor switch. It will be very flexible on the voltage range as long as the transistor can handle the switching and the power of the device.


Necolei
 

tom_hanks

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use the following ckt with invert logic in PLD....

connect 7v to feeder wire...
 

Iouri

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use ULN 2001 from TI
 

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