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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74HCT244 UART level translator, how would the circuit look?

I am building a UART 3.3V to 5V Level translator between a Raspberry Pi and a ATMega328. The 74HCT244 is my choice of translator but I can't find a good example of of hooking it up. Am I right that ...
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57 views

Clamping Diodes - Any disadvantages form continuously clamp down?

I am looking at using Clamping diodes to protect my Raspberry Pi UART pins from over voltage. The ESD Diodes I am looking at using My question is, is there any harm in them continuously clamping down ...
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32 views

Vbe multiplier logic shifting

I need to shift 5V form to 3.3 for USB communication. Is it possible to use Vbe multiplier instead of 3V3 Zener diodes simulate this circuit – Schematic created using CircuitLab
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59 views

Level shifting 8 output IO Expander from 0V-5V to -2.3V to +2.3V

I have a circuit problem that I'm trying to find a solution for. I have an 8 output IO expander which outputs 0V-5V. It is running analog switches which have a Vdd and Vss of +-2.3V. Using the 5V ...
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698 views

how to increase the voltage of a digital signal?

I'd like my Raspberry Pi GPIO port to communicate with a digital circuit that works at 2x the GPIO voltage. The communication will be at a relatively high frequency (up to 500kHz). The main question ...
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1answer
75 views

Bi-Directional Level Shifter Circuit with pull-down resistors

I'm looking for a bi-directional level shifter circuit to interface a 3.3V controller to a 1.8V component which is not 3.3V tolerant. Usually I'm using the well-known level shifter circuit, e.g., ...
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40 views

HIGH speed Level Shifting

I was working on FPGA project that will be able to detect and timestamp input pulses from a series of detectors giving off a 20 ns pulse for each positive detection. Problem arises is two fold: the ...
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16 views

Is SN74CBTD3861PWR or alike available in DIP?

I need to find some DIP IC to bidirectionally shift 5v-3v for FPGA interfacing. I have found that SN74CBTD3861PWR is more than capable of doing that. Is there any IC like this, except in DIP? Thanks ...
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24 views

Advantages of integrated level translator

I've been trying to decide on what level shifter approach to use for a single, bi-directional, slow signal going from 5V to 3.3V. My input could be a switch to 5V, or maybe a logic level output. ...
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47 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 ...
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33 views

Octal buffer/line driver need current limiters?

I have a couple of these http://www.toshiba.com/taec/components2/Datasheet_Sync//149/215.pdf I am using for level shifting 3.3 volts to 5v from a beaglebone to a stepper motor driver. The frequencies ...
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1answer
89 views

Voltage shift from 3.3V to 12V

I'd like to use MX-FS-03V 433MHz transmitter together with a Raspberry Pi (RPi). The Raspberry Pi's outputs have 3.3V, but the MX-FS-03V operates on 3.5-12V (the higher the voltage the higher the ...
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3answers
107 views

Voltage shift from 5V to 3.3V

I'd like to use MX-05V 433MHz receiver together with a Raspberry Pi. The MX-05V operates on 5V, but the Raspberry Pi's inputs only allow 3.3V. So i need to shift the RX data output level from 5V to ...
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2answers
136 views

Need help with a VU meter analog signal

I am making an Arduino VU meter. I need to convert an analog AC audio signal to a varying positive DC signal. I would like the following outputs: 2.5 V output at 0 V input (from VM1); 5 V at maximum ...
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1answer
86 views

I2C level converter stops bus [closed]

I am trying to get an lcd 16x2 with PCF8574 I2C working with my arduino due. If i connect my lcd with 3.3v (backlight doesn't work, led from the PCF8574 lights up) and upload the i2c scanner sketch ...
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1answer
68 views

using transistor to switch 3v from 2

i need to use a GPIO pin to test whether an LED is on/off. the LED only has 2v power which is not enough for my digital input (3.3v) so i would like to use a transistor to amplify the voltage from 2v ...
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40 views

Increasing voltage swing of totem pole structure

I have a totem pole transistor pair as seen in the schematic below which consist of Q1 and Q2. This totem pole is driven with 5V pulses because of the limitations of the opto-isolator. My aim is to ...
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83 views

Synchronous MOSFET Driver for Inverting Buck-Boost topology

I'm on project to make Inverting Buck-Boost converter. that digitally controlled using microcontroller by using feedback on ADC and send duty cycle with specific frequency on PWM pin. I'm using ...
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1answer
163 views

Linked grounds produce “noise” on Arduino's 5V lines

I'm using an Arduino to realize two "simple" tasks. The Arduino shall receive messages by an 433MHz receiver and send them via ESP8266/ESP-01 to a server. The schematic/wiring plan is attached below. ...
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2answers
73 views

SD card logic levels

I'd like to use an SD card using an SPI interface. My microcontroller uses GPIO logic levels of 2.8V. Do I need a level shifter, or can I connect the card directly? I've had a look at the Physical ...
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1answer
84 views

Shrink ADC signal from 5V to 1V?

I have an ADC signal, how do I shrink it to 1V from a 5V sensor like Hall IC for example. Of course, a resistor divider is one method, but will it work reliably as the output is expected between 0 to ...
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346 views

Level shift circuit MCU to MOSFET

I have a H-bridge that is being supplied by 12V and using around 10A. I am turning it on/off with a microcontroller that has an output of 0V-5V. The switching frequency is "super low" so the gate ...
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37 views

How to fix Serial 0 Level not fully grounded

My project uses a USB to Serial(5V) converter board. Looking at the Serial signals on a Scope I noticed that the 0/GND level signals are very high. They are nice and squire but consistently around ...
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118 views

When is voltage level shifting needed/unneeded?

I know the question sounds simple, but I am facing an edge case here. I have a microcontroller with 3.3V on the GPIO's. I want to use it with this LCD panel. Adafruit creates their own breakout board, ...
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93 views

Best way to read 18kHz PWM signal with wide V_pk-pk (5.5-18V)

I am trying to design a circuit for level-shifting a PWM signal coming from a sensor and reading it with a 5V micro controller in an automotive environment. I will run my design by an EE at the end ...
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1answer
103 views

How can I increase the multiplier of a voltage doubler circuit using IC4049?

I replicated a voltage doubler circuit from this example I found online: ... and as expected, I am getting 12V from a 6V input. I would like to increase the multiplier to more than 2x, but I am ...
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132 views

Instrumentation Amplifier Level Shifter

I am working on a temperature measuring circuit using a pt100. The input of my instrumentation amplifier (AD8226) is between 80-200mV. The Gain is set to 20.84 so I get an output range of 1.7-4.2V. I ...
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1answer
60 views

SPI Clock Frequency changes when level shifted

I'm using Adafruit's TXB0108 bi-directional 8 channel level shifter with my Arduino Uno. The SPI clock from Pin 13 is level-shifted through the first channel of the level shifter. Measured with my ...
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3answers
164 views

Logic level shifting from 5v to 2.8v and vice versa

I need to use a logic level shifter in my circuit which translates 2.8V logic level into 5V and the other way round. I found this document. The device itself is presented on the page 10. It is very ...
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1answer
60 views

Level shifter circuit with 50 V output

I am looking for a level shifter circuit, that can convert 5V to 50V logic. I've been looking through some designs. I see a lot of designs uses a current mirror for this. And was wondering, what is ...
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Level shifting 5V to 3.3V - can I just use a zener diode?

simulate this circuit – Schematic created using CircuitLab My problem is the ATmega328 is running at 5V. I know I need a bidirectional level shifter. However don't really want to spend ...
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64 views

Why level-down shifters

I am considering a dual-Vdd circuit design, Vdd_H is 0.6V, Vdd_L is 0.35V. I understand that I need level-up shifters to convert the Vdd_L domain signals to Vdd_H signals, to have enough drive. While ...
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1answer
80 views

Why is the MISO not level shifted in this circuit?

I am looking at SparkFun's CC3000 breakout board schematic. CC3300 is TI's wireless module. The CC3000 operates on 3v3. And because the breakout board is intended to be used with an Arduino (which has ...
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1answer
54 views

How to design a 3V3 device to be safely programmed by 5V ISP

I'm designing my first 3V3 circuit with ATmega8. While the uC itself supports both 5V and 3V3, some of components do not. I'm going to place ISP socket on board and I'm wondering how to ensure that a ...
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1answer
31 views

Understanding Block Diagram for Load Switch

I'm looking at the Vishay SiP32431 and am confused by the block diagram, copied below. I understand the P-Channel at the top, but what are the triangles? What is the difference in level-shifting ...
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63 views

Driving P-FET with lower voltage

I have a problem with the circuit pictured here. My aim is to drive 12V line using a uC running on 5V. I'm testing it without the uC, just shorting the in node with either GND or +5V. In both cases, ...
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3answers
121 views

Level Translator for AVR and microSD

I want to connect a microSD card in my AVR ATMEGA32, through SPI, which its operate with 5V. The microSD card i think that operates with 3.3V so, it is must to connected via bidirectinal level ...
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1answer
88 views

IF signal amplify without delay

I have a RF Frontend that has an 4 IF signal output (2 I channel and 2 Q channel from 2 receiving anettans). Each channel of the IF has a signal rangining from 1.5V to 3.5V with a DC offset of 2.5V. ...
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203 views

I'm building a 3.3 to 5V level converter with a MOSFET but can't reach 800KHz

I've built a level converter for a digital PWM signal that runs at 800KHz. The circuit goes like this: *I'm using a BS170 transistor instead The problem is the signal gets distorted at around ...
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2answers
133 views

Arduino: RS232 Level Shifter or RS2323 Breakout needed?

I am trying to establish communications between an Arduino Mega2560 (Master) and a customised controller (Slave) via a Master-Slave RS232 link using Modbus RTU. The communication should be ...
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94 views

PWM to proportional bipolar control with push-pull amplifier. Need input and opinions

I'm putting together a circuit to control a (small wattage) TEC device in a bipolar manner. The idea is to have a micro controller put out a 3V3 PWM signal, level shift it between +- 3 V and filter it ...
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2answers
474 views

Microcontroller PWM to bipolar push-pull amplifier issues. (level shifting)

I'm trying to design a circuit that allows a micro controller (arduino) to control a voltage to a load. The load voltage needs to be bipolar in nature (+- 3 to 5 V) for use in controlling a TEC. My ...
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2answers
230 views

Sense Automotive 12V Circuit from 3.3V microcontroller safely

I want to sense a circuit state in an Automotive circuit (12V nominal) from a 3.3V microcontroller (MSP430Gxxxx). The circuit is normally 12V (or VBat) until either the Wireless ECU or a Door Key ...
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1answer
134 views

Purpose of Level shifter in charge pump

Why is there a need for level shifter in this circuit (charge pump)?
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2answers
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What is the best way to convert 1.8 V to 5 V?

I connected HC-SR04 ultrasonic sensor, to single-board computer BeagleBoard-xM. Trigger pin requires 5 V DC. However, control pins of BeagleBoard-xM can provide only 1.8 V DC. What is the best way to ...
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5answers
2k views

Simplest uni-directional level shifter (3.3V -> 5V)

I want to drive a WS2801 LED strip from a Raspberry Pi GPIO. I have connected the MOSI and CLK pins directly to drive the LED but it is not working as the WS2801 datasheet says that a high level is ...
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2answers
331 views

Random flashing on WS2812B LEDs

I'm trying to drive a strip of WS2812B LEDs with a Beaglebone Black(revC). Because the LEDs expect a data signal at 5V and the BBB outputs at 3.3V, some sort of level shifting is required. However, ...
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1answer
122 views

Is it safe to use a bus buffer as level shifter?

I am currently using SN74ABT5402ADW as a buffer and level shifter for my ADC, however, the datasheet does not explicitly say that it can be used as a level shifter. I provide it with 5V power, but the ...
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2answers
378 views

Can I use 74HC14 or NPN transistor instead of MOSFET as level shifter

I have SN74HC14 or BC548 / 2N2222 transistors. I need level shifter for I2C between arduino and RPi. Here's simple circuit from the internet Problem is I don't have any MOSFETs. Can I use NPN ...
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138 views

Level Shifting & Amplification

I am trying to design a crane load (Weight) measuring unit using motor current measurement technique. For some reasons we can't use load cells here. Part of schematic I have drawn here An air core ...