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Questions tagged [level-shifting]

Level shifting is the process of converting between different logic levels. E.g. from 0-3.3 V logic to 0-5 V logic

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1answer
83 views

Does this level shifter has over-voltage tolerant inputs?

I would like to use the FXL4245 to level shift both 3.3v and 1.8v signals to 1.2v. I was thinking of supplying VCCB from 1.8v, VCCA from 1.2v and setting the direction to translate from B to A. Most ...
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1answer
897 views

Capacitors in MAX 232

Out of curiosity, can I replace the electrolytic capacitors in the circuit with non-polar ceramic capacitors? Will I get the shifting in level? MAX232 datasheet: LINK
2
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1answer
676 views

raspberry pi 3.3 to 5v level shift for led rgb strip

I'm working on my first electronics project. Basically I'm trying to control an rgb led strip from a raspberry pi's gpio pins. I'm trying to convert the raspberry pi's 3.3v up to the 5v required for ...
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3answers
191 views

Driving capacitance with a high voltage level shifter

I am having issues with a 'high' voltage level shifter I am creating. I need to drive a 28Vpp waveform with specific timings ( <.1us rise time, 1us pulse width), converting from the 3.3V logic that ...
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1answer
371 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....
0
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1answer
136 views

Does an interrupt signal with 2.8 V high level need a level shifter for a 3.3 V microcontroller?

So, I am currently working on interfacing a MSP430G2553 and an I2C proximity sensor VL6180X. In order to have consistency in my voltages and hardware design, i choose this I2C device from polulu (...
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1answer
300 views

How to use CD40109BE to level shift one input from 3v to 5v?

I want to use the Raspberry Pi's 3.3v GPIO pins to control whether a 5v LCD screen is on or off. The Raspberry Pi has a 5v pin but it cannot be turned on or off using Python or similar. Only the 3.3v ...
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2answers
123 views

Bi-Directional MOSFET level converter problem

I am using standard schematic of level shifter. It is used to communicate with avr and sometimes reset it. Everything works fine except for reset line. After the first pulling down I am not able to ...
0
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1answer
340 views

Capacitor in RS232 level shifter. Data is strictly half-duplex

I have created a level shifter very similar to the schematic at: http://picprojects.org.uk/projects/simpleSIO/ssio.htm except for the capacitor I use 47nF because the page claims: at high bit rates ...
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2answers
118 views

mosfet capacitance charging question

Can someone please explain to me why the output of this level-shifting circuit starts charging from around 2.8V to 5V, and NOT from 3.3V to 5V. At the time where the output is at 5V there is a 3.3V ...
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1answer
158 views

How to transmit many digital signals between two systems powered by different power supplies

I’ve run into problems with my project.I have two different power supplies and I’m trying to pass logic signals through the system as you can see in the picture. I’m looking for an IC that could ...
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3answers
5k views

1.8V UART with 3.3V UART

I have Quectel EC25 module comes with GPRS and GNSS in built, this module needs supply of 3.3V and it's UART works at 1.8V (default Baudrate is 115200) - But i have a processor ATMEGA2560V running at ...
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1answer
565 views

Is the SX1278 SPI interface 5v tolerant?

I want to connect the SX1278 LoRa module with its SPI interface to a microcontroller. My module Datasheet But in the datasheet I haven't found anything about the maximum digital input voltage. ...
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1answer
496 views

How does a level shifter shift the DC level of a multi-stage amplifier output to the ground (or zero)?

As we can see that input fed to this amplifier is the output of final stage of a multistage amplifier and if we apply KVL to base-emitter loop then Vbb is the DC level acquired from the previous ...
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3answers
962 views

Level shifting 5V signal to 3.3V using voltage divider where source has 10k resistor to ground

I made a circuit to read from a dust sensor that operates with a 5V rail. The microcontroller I am using is supplied with a 3.3V rail, and it shares the same ground as the dust sensor. As the output ...
2
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2answers
711 views

50 MHz Clock shifting from 5 V to 3.3 V and Bidirectional , possible?

I'm trying to design a circuit to convert a 50 MHz clock source from 5 V to 3.3 V. At first, I thought of using Sparkfun's level translator shown in the link below: https://learn.sparkfun.com/...
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2answers
1k views

How can a Switching diode act as a level shifter?

I am following a schematic about a one-way logic 3.3->2.8 level shifting circuit. The hardware in question is a MCU output that drives 3.3V and the input of the UART interface of a SIM800 GSM Module....
7
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1answer
10k views

How to convert a digital signal from 24V to 5V

I have an industrial automaton that gives me a digital signal (24V or 0V) on its outputs and I want this signal to control an integrated circuit, but the integrated circuit only takes a TTL signal in ...
0
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2answers
580 views

Analyzing 24V fast PWM signal in Arduino

I am currently trying to fit a 3d printer head on a cheap chinese CNC mill. So far I have successfully been able to control the fan, heating element (including reading a thermistor) and the feeder ...
16
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5answers
4k views

Are BJTs suitable for level-shifters? It seems FETs are more common,how do they compare?

I'm a hobbyist, and never got past the datasheets/tutorials for FET transistors; I'm a BJT man. I never found discussions dealing with BJT vs. FET and specific applications best suited for each type. ...
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3answers
2k views

Convert 12VDC fan controller output to TTL signal of laser?

I'm adding a laser cutter to my 3D printer. I want to repurpose the cooling fan output to control the laser. My laser has a power supply which accepts a 5V TTL signal to turn the beam on/off. The ...
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0answers
468 views

Count RPM on diesel truck using an Arduino

I'm trying to make an truck RPM reader that will output a signal once the RPM's exceed a set-point. I believe that I can easily code an Arduino to do this, but I'm having trouble with the circuit. I ...
2
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1answer
473 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 ...
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1answer
403 views

transistor logic level converter circuit

this my first time asking questions to electronic community. So, I hope you ll help me. My question goes like this: i have arduino Due board connected to this schematic ( http://i.imgur.com/Qx2xObc....
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5answers
2k views

Level shift 0/5V to -10V/+10V

Can anyone show me a simple circuit to shift a 0V/5V square wave (low freq, under 10Hz) to a square wave -10V (when was 0) to +10V (when was +5V). Can it be done with some transistor or do I need an ...
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2answers
706 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?
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2answers
236 views

LPC1769 and ATMega88 UART interface

I am referring below schematics for implementation. LPC1769 -- > 3.3V Powered AtMega88 -- > 5V Powered LPC1769 UART pins are 5V tolerant. And due to some reason, can't operate AtMega88 on 3.3V ...
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1answer
143 views

Raspberry PI, PCF8574AT, MPU6050, BMP180 i2c voltage difference?

I'm building a rpi 3 b+ based robot which collects data from a MPU6050 (Gy-521 breakout board, I power it with 5V), a BMP180 (3V input) and displays some data on a LCD via a PCF8574AT i2c converter (...
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1answer
2k views

Connecting 3v digital output to Arduino using bi-directional level shifting (mosfet)

I have a digital output from a 3.3v device that I would like to make 5v tolerant - i.e be able to connect it to either a 3.3v OR 5v MCU. I could technically connect the output directly to the ...
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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
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2answers
299 views

Is this a reasonable design for a high-speed level shifter?

I wanted to try designing a device that will use an RS-232 interface. RS-232 works at +12/-12V - I know I can use a MAX232 as a level converter, but I wanted to try designing my own (this is a ...
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1answer
326 views

Anything wrong with this level shift and amplify op amp circuit?

I posted this circuit in a question about protection clamping, but got a lot of questions around the circuit itself. Is this not a good / the normal way to shift and amplify a low amplitude (75mv) ...
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1answer
257 views

what protection is required between op amp and 5v adc?

I've created this small circuit to translate voltage drop over a shunt resistor into a usable range for arduino (5v atmega32u4) adc. This is to measure current out of and into (charging) a 12v ...
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0answers
49 views

Source/Sink on 74AHCT2G125DC not driving WS2712bs

Per advice in this post I am using a 74AHCT2G125DC (datasheet) to drive a Neopixel/WS2812b strip's data pin from a 3.3v MCU. The MCU is driving A1, and the addressable LEDs are chained from Y1. VCC on ...
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2answers
2k views

How to scale and shift voltage signal?

I want to scale and shift my voltage signal by below relation: $$ V_{out} = \frac {10} {12} \cdot V_{in} - 10 $$ Indeed my primary voltage is from 0v to 24v and I want to put it from -10v to +10v. ...
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2answers
166 views

Translate low logic level to higher voltage range

I need to shift a digital signal from an MCU to a higher voltage range. The MCU outputs 0-5V and I need to give this Signal inverted to a higher voltage rail. In the picture you can see what I try to ...
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5answers
3k views

convert 12V PWM circuit to 5V PWM using opamp [closed]

I can convert a 12 V PWM signal into 5V signal, by using voltage divider on 12 volt signal , then directing it to base of NPN common emitter transistor with collector connected to 5V simulate this ...
2
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1answer
276 views

Level shifter default high problem

I recently bought a logic level converter for interfacing Arduino Uno with ESP8266. I had decided to use SPI communications between the two but after making all connections correctly it failed. ...
2
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2answers
397 views

MOSFET driver for digitally controlled, battery powered boost converter

I have a circuit powered from a single Li-ion cell. It contains a microcontroller which is powered by 3.0 V directly off the cell (through an LDO linear regulator). This circuit has a 12 V load, so I ...
0
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3answers
377 views

Proper (low power) use of a tri-state buffer when used as level shifter.

In my application, I have a 3.3v MCU driving a logic line based device at 4-5V where I need to be able to put the level shifter in a high impedance state. (This is particularly important to avoid ...
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0answers
477 views

Level-shifting for negative-voltage logic

I'm trying to fix a 1970-vintage calculator - a Wang 360 (http://www.oldcalculatormuseum.com/wang360.html) - for a hobby project. The power supply voltages are +11V and -11V. It looks like a logic "0"...
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2answers
139 views

3.3 to 5V logic translator followed by a long cable

I was testing the TI TXB0108 today to shift 3.3V from a MCU to a DSP. The DSP connector only has 17 digital inputs, and a ground (no VCC), and expects 0-5V. The 3.3 and 5V power are both being ...
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2answers
281 views

Will this 3v3 level shift for arduino->avr programmer work

I'm trying to program an avr in a circuit that has other components on the same SPI lines that would be damaged with > 3.3 volt logic. I figured I could just use an arduino (5v logic) with a level ...
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2answers
284 views

Convert and shift voltage from DAC using opamp

I have a signal coming out of a basic DAC (resistor and capacitor) as follows: 1.4V min 4.8V max ~2.8V pp I have a bipolar supply that is -12V - 0 - +12V What is the best way to shift this signal ...
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1answer
1k views

Interfacing 5V to 3.3V for Xilinx Spartan 6 FPGA and vice versa

I am referring to high speed design with Spartan 6 FPGA. My query is, in design I am having 5V compliant devices (ADC,FIFO memory) and want to interface with 3.3V FPGA spartan 6. If I opt for simple ...
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1answer
66 views

Bidirectional Electronic Relay

I'm trying to figure out the best way to build a small "wall" of 20 different OBD-2 connectors which would be use to initialize a set of OBD-2 compatible devices. The situation is that I need to be ...
2
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2answers
419 views

Level shifting of 125 MHz clock signal

I have 3.3V 125MHz clock signal which need to be translated down to have an amplitude of 1.8V. My first idea was to use some logic inverter, run it on 1.8V, and since it probably has protection diodes ...
2
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2answers
874 views

Level shifter to convert dc voltage

Can anyone help me to design a circuit which outputs 0v dc when the input is 2.6v dc and 5v dc when the input is 5v dc?
2
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3answers
704 views

Level shifting a clock signal

I need to step-up a clock signal of 8 MHz from 3.3V to 5V, I was wondering if this type of level shifter would work : The BSD840N as rise and fall time fast enough for my application but I'm not sure ...
2
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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 ...