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0
votes
1answer
341 views

Arduino 3.3 V to 5 V to controll Stepper Driver MA860H

I'm currently working on a project with an Arduino Due and Stepper Driver MA860H. The issue I'm running into is translating a step Direction and Pulse from the Arduino Due to the MA860H. The Due has 3....
2
votes
1answer
412 views

How to use 74LS245 to level up signals form 3.3V to 5V?

I am using FPGA 3.3 V outputs to drive 16x4 character LCD (5 V). I went through the data sheet 74LS245 and found this can be operated at Vcc 5 V and accept input voltages from 2 V. I am confused ...
2
votes
2answers
664 views

3.3V step up to 5V using BJT

I'm using an Arduino Blend Micro with outputs that provide only 3.3V and I need to control a MOSFET that needs 5V on its gate. Can I step up the voltage from 3.3V to 5V using a single BJT?
0
votes
2answers
1k views

How to shift-up logic signal from 3V3 to 5V for NeoPixel [duplicate]

I'm working with NeoPixel led strip and a microcrontroller which run at 3.3V. As you can read in the NeoPixel documentation using a micro with 3.3V out on pin require the ...
2
votes
2answers
2k views

Proper use of CD4504BE Level Shifter IC for SPI

CD4504BE Datasheet: http://www.ti.com/lit/ds/symlink/cd4504b.pdf I've been searching all over the web for a proper example of the use of this IC, but I haven't found anything. My basic application is ...
2
votes
2answers
7k views

Changing a 3.3V signal to a 5V signal using a BJT transistor

I saw someone asking this EE.SE question in a thread over 2 years old and could not really understand some things about the answer. He had a 3.3V input signal that he wanted to change into 5V signal. ...
0
votes
5answers
975 views

3.3v to 5v conversion with non-5v tolerant part. (single npn transistor?)

I was wondering if I can convert 3.3v to 5v when the 3.3v part isn't 5v tolerant. I was thinking of using this layout: However I'm not sure if the gpio pin will get 5v "for a second" or if this is ...
3
votes
1answer
239 views

Interfacing 5V to 3V3 devices - MAX3377 damaging my board

I am using the bidirectional MAX3377 level translator by maxim. I am doing a prototype board and as I test this board piece by piece, everything works until I solder on this part, and my 3v3 rated ...
0
votes
1answer
2k views

Powering 3.3V I2C from Arduino 5V?

I need my Arduino to communicate with a fairly sensitive 3.3V I2C device, and am using a Bidirectional Level Converter to step down the voltage. However, I still need a 3.3V source (for the I2C ...
0
votes
2answers
72 views

Help with Texas Instruments SN74LVT125

I am interfacing a 5V system to a 3.3V using the SN74LVT125 to shift down TTL voltage to 3.3V My problem or my question is, Some of the input pins (the A ones) are being triggered by a 5V signal that ...
0
votes
1answer
692 views

Level shift from 5V to 3.3V (and vice versa) using 74HC4050N,652

Below you will find a link to the datasheet for 74HC4050N. My order I placed had a suffix of ",652" on that part, but I'm not sure what that number refers to. http://www.nxp.com/documents/data_sheet/...
3
votes
3answers
761 views

Interfacing open-collector optoisolator to 3.3V microcontroller

I have a bit of a puzzle on my hands trying to interface a Fairchild MID400 optoisolator (popular "logic level" optoisolator for mains detection) to a 3.3V GPIO pin. The MID400 is a 5V part [*] and ...
1
vote
3answers
1k views

voltage of input(+5V) is greater than the supply(+3.3V) provided for 74HC245 buffer

In my design I am using 74HC245 buffers between a input signal of +5v and controller pins of +3.3V. What is the supply value I have to use for buffer (74HC245). I want to use +3.3V as the supply, but ...
0
votes
2answers
3k views

drive a relay from a 3.3v 2mA max output

I need to drive a relay, but my logic signal is limited to 3.3v with a maximum of only 2 mA. Can I use a level shifter? I have a 5V relay with a 125 ohm coil drawing approximately 40 mA. Any other ...
2
votes
0answers
2k views

Level shifting with BSS138 - weird values

I need to connect 5V and 3.3V devices via I2C as follows: I've connected 3.3V and 5V pull-ups and tried to measure the voltage. There is 5V on HV and TX_HV but 4,7V on LV / TX_LV. Putting TX to LOW ...
7
votes
1answer
806 views

Open collectors & 74LVC245

I am trying to interface a PS/2 keyboard to a MSP430 for a toy. The PS/2 keyboard runs off 5V, but the MSP430 microcontroller runs off 3.3V. So I have a 74LVC245 level shifter to convert between the ...
0
votes
2answers
305 views

Automatic ranging level convertor?

I'm designing a PCB based on an ATxmega microcontroller (max. 3.6v tolerant). I plan to connect a range of external 3.3v devices. However, I do have a few 5v devices that I want to connect. There are ...
12
votes
1answer
4k views

How is this circuit for level converting (5V<>3.3V) working?

Does anybody know, how is this circuit exactly working? It is level converter between 5V and 3.3V logic and it is bi-directional. I have some theory, but I am not sure with it (I never worked with ...
6
votes
3answers
11k views

Bidirectional level swiching 5V <-> 3.3V

I am looking to interface a 3.3V device with a 5V one. This will require the shifting of the logic levels between the two devices. Doing this in one direction is a trivial matter, but I need to do ...