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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118 views

Positive Level Shift a Clock Output using Diode?

I need to level shift a 26mhz 1.8v clock output by .7v on both the high and low side (so clock swings from .7v to 2.5v on output). Would a simple diode/resistor setup like below work for this? ...
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2answers
280 views

Issues using an Ultrasonic Sensor with Raspberry Pi

I am conducting a project which needs to use a precise ultrasonic sensor but I am having trouble working it with the raspberry pi. The sensor I’m using is the Senscomp 600 series; the manual isn’t ...
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2answers
78 views

74AS TTL to CMOS pull up resistor and maximum speed (or lowest delay)

Hello I have to pilot a CMOS input 5V chip device with a 7474 flip flop with the lowest possible delay to minimize clock jitter. Signal is about 11.3 Mhz I have two options: 1) 74HC74 (CMOS ...
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2answers
234 views

converting 220v ac sognal to 5v or 3.3v signal

i need to convert 220v signal to 5v or 3.3 v signal if push button pressed.. i tried the following circuts: 1)using neon lamp and ldr: **this circuit works fine and do what i need but if push ...
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2answers
786 views

Level shifter circuit

I found this level shifting circuit online. When I simulated this on Multisim, it works fine, but how do I find the relationship between the output and the input. Here is the circuit.
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1answer
1k views

Odroid XU4 and Olimex MOD-IO by I2C via level converter

Long version Like some of you, I do electronics as a hobby and I'm relatively now to this, so I have a few questions regarding the communication between my Odroid XU4 and a nice I2C module from ...
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1answer
70 views

Voltage shifter 0-30VDC

I am required to generate and measure squared signal (PWM like). I should cover a 0-30VDC amplitude. High level of the signal is 30 VDC, low level is 0VDC. The bandwith to be covered is 0-20kHz. I ...
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1answer
76 views

Isolated three level pwm LTSPICE

I am doing a simulation on LTSpice of a three level ANPC. The ground is connected to the neutral point (i.e in the middle point of the DC input) and the gate drivers are isolated by using a DC DC ...
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1answer
52 views

Multiple ground planes, single point ground, and a level shifter

I'm using a level shifter to go from 3.3V to 5V (digital/analog). According to the datasheet, if I put 1 ground on the left side of the IC and the other on the right, it would tie the grounds together ...
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1answer
40 views

Digital signal integrity & grounding

I have a battery operated device with an old B&W LCD in it. I'm tapping to the display bus and would like to input it into an FPGA for some processing. The bus includes vertical and horizontal ...
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1answer
45 views

Weird level shifting issue only when connected to IC chip

I'm connected to a 5v heat-pump to control it via serial. I'm using a level shifter to shift between the two as the heatpump is 5v and the D1 is 3.3v shown in the scope images below. My issue is I can'...
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1answer
67 views

Best way to transform multiple digital signals from 12V to 3.3V

I am looking for the best way to transform multiple (more than 10) 12V digital signals down to 3.3V I know some ways to do it, such as voltage dividers, make use of BJT or MOSFETs, or even ...
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1answer
140 views

SPI readings always high (1) when connected via bi-directional level shifter

I am trying to read two gas sensors (MQ4 for methane and MQ7 for carbon monoxide) with my NodeMCU ESP8266. Both sensors require 5v (for the heaters) and have 4 pins (GND, VCC, DO, AO). Digital outputs ...
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1answer
453 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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1answer
62 views

Question regarding MCU, Voltages and Level Shifting

I have a board with a 3.3v MCU (C8051F850 from Silicon Labs in a QSOP-24 package) but whose pins are 5v tolerant. The board is running at 5v and all the relevant GPIO pins from Ports 0 & 1 have ...
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1answer
517 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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0answers
110 views

Upward Voltage Level Translation

I need to up-translate two complementary 2.5 V signals to 5 V. I am looking for a circuit which can do this and which consumes ultra-low static power. I tried to design one, using 4 MOSFETs as shown ...
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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 ...
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0answers
40 views

How do I wire a Rasberry Pi 3B+ to a WS2812b RGB strip?

I am working on a project where I need to use a WS2812b RGB strip. I am really worried because I have already burnt 2 Raspberry Pis with my wiring. I just want to show my schematics, and be assured as ...
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0answers
61 views

1.8 V to 5.0 V level shifter with low delay and low rise time

i have a problem with finding the right components and circuit for the following problem. I have a device that is producing trigger signals with a length of 100 ns at a amplitude of 1.8 V (left part ...
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0answers
505 views

Interfacing LVDS to 1.2V IO Bank (e.g. POD12 or SSTL12)

I am currently working with an Arria 10 device (specifically a ReflexCES A10 SoM Indus module). The GPIO pins of the device are split into IO banks with specific VCCIO voltages controlling the banks. ...
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0answers
446 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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0answers
290 views

Power from MIDI + level shifting

I have a circuit that draws little power (under 5mA), it accepts 2 MIDI signals and does some switching. I'm not using the standard optically isolated circuit as there is only signal manipulation done ...
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0answers
2k views

24V to 3.3V Level Shifter

this is my first post so please excuse me for incomplete or improper text. I am developing an interface board to connect ‘Converter control unit’ to HIL system. For this purpose I need to level shift ...
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0answers
746 views

5-10V to 3V3 level converter for bidirectional I/O

I need connect 3V3 powered MSP430 family processor and PW0268 ultrasonic sonar IC. PW0268 is powered Vcc 5-11V and is connected with MCU via bidirectional IO pin which is internally pulled up (3.5-6....
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0answers
230 views

OPAMP Level shifting problems

This is my first post here. I am facing the problem with level shifting circuit which is later the input for the ADC of the microcontroller. As far as the sine and triangle waves concern circuit is ...
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0answers
654 views

Level shift and amplify

I searched around the forum and found this post: Analog voltage level conversion (level shift) I built a dinamic motion seat with an Arduino, H-Bridge and 2 wiper motors. The wiper motors are acting ...
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0answers
42 views

Noise filtering circuit on a pulled-up 1-wire bus

The 1-wire bus data line is connected to a microcontroller pin (through a level shifter) with open drain configuration. The bus is pulled up to 5 Volts (DVDD) with a 4.7k resistor. The communication ...
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0answers
88 views

Does Level Shifting for I2C also work for UART?

This is a widely used circuit for level-shifting I2C signals that will be familiar to many of us here: simulate this circuit – Schematic created using CircuitLab Can it be used for shifting ...
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0answers
348 views

correct use of MAX3232 for a single TTL to RS232 connection

I am using the MAX3232 chip for doing TTL to RS232 conversion. Datasheet available here: http://www.ti.com/lit/ds/symlink/max3232.pdf The chip is dual channel, but I only need to use one channel. I ...
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0answers
405 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 ...
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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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0answers
127 views

N MOSFET bi-directional level shifter draining Vcc possible?

I'm not a specialist in analogue electronics, so my question can be a very simple for someone to answer. I have a bi-directional level shifter built with N-channel MOSFET as on picture below. It ...