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

learn more… | top users | synonyms

1
vote
1answer
33 views

Can I use a voltage divider for shifing logic levels?

I'm trying to drive a 3.3V IC from an Arduino which has 5V logic pins, so I need to shift that 5V down. There's no data from the 3.3V device to the Arduino so I don't need to shift back up. Can I use ...
3
votes
3answers
163 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 ...
0
votes
3answers
58 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
1answer
87 views

why use 2 diodes when shifting from 3.3 to 5v? [closed]

for the question "how do I go from 3.3 to 5v" people point to the microchip cheat sheet. The Diode option has one between the data line and 5V so it pulls it almost to zero, the other one seems to ...
1
vote
1answer
48 views

Large range input single level shifter

I have an application where I will be taking serial signals will need to level shift the signal to 3.3V. The input signal will be from 15 to 5V for a high input and I need them all shifted down to ...
2
votes
0answers
40 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 ...
0
votes
1answer
41 views

Shift DC signal to AC

I want to make a DTMF decoder and use it on an internal DC phone line. I made a decoder with PIC microprocessor (Black DTMF decoder) that works with signals around 0V. My internal phone line consists ...
1
vote
2answers
65 views

Power Supply Issue, Voltage Drop Under Load

I have the Ardupilot Mega flight control board (APM), which outputs 4.8V. I want to power CC3200 MCU with it, which needs at least 3V for stable operation. I power APM using a power module connected ...
-2
votes
2answers
23 views

How to do level shifting signal in simulink matlab?

i want to do level shifting signal from -5..5v to 0..10v in simulink.. anyone know how to do that in simulink? thanks
1
vote
2answers
53 views

I2C level shifting to multiple voltages inside a BMS

We're building a BMS that has a micro on each cell in the pack. I know this isn't standard and the issues that come with it, however the pack isn't a standard layout, and the benefits out weigh the ...
0
votes
1answer
49 views

Voltage level translation

I am working on a Vehicle Tracker project. I have few digital inputs coming from vehicle system & their voltage level is 90V. These should go to Micro controller GPIOs which are @ 3.3V. What are ...
0
votes
1answer
42 views

Level Shifter Issue with Ground

I am using this level shifter spark fun breakout board: https://learn.sparkfun.com/tutorials/using-the-logic-level-converter My goal is to interface a 5V logic SPI LCD with a 3.3V logic micro ...
0
votes
1answer
50 views

Whats happenning with my logic levels?

I'm using a 3.3 MCU and a 5v logic RS-485 IC. I'm trying to send out some data to another controller. I don't have a logic level shifter as of now. So I decided to use resistor divider, to get it to a ...
0
votes
0answers
56 views

Level shift and amplify battery voltage for ADC input

I have an 8s LiPo battery (ie 8 x 3.7 V nominal cells, ranging from 25.6 V low capacity to 33.6 V full capacity). This is connected to a motor controller that provides a 5 V regulated supply to my ...
1
vote
0answers
46 views

Driving pinball flipper with N-Channel MOSFET

I am trying to drive a pinball flipper using the circuit below, but after switching the flipper on a few times the MOSFET failed (short to ground) and the voltage level shifter appears to have been ...
0
votes
3answers
91 views

Does powering a module with 5v instead of 3.3v affect it's logic level? [closed]

I bought a NEO-6 u-blox 6 GPS Module (datasheet, pages 9 and 14), which has a standard serial connection. I have a USB to serial converter, which is 5v logic. This board says it can be supplied 3v-5v, ...
0
votes
1answer
65 views

Will 3.3v to 5v level converter work with USB data lines?

I'm trying to design a low-speed USB device based on ATmega16a. That chip doesn't have any USB interface, but it is possible to use bit-banging and there are even ready-made libraries to do so, like ...
0
votes
0answers
63 views

Level shifting with buffer and non-inverting amplifier

I have designed a circuit in order to convert 0-3.3v output from my STM32F1 micro-controller to a 0-5V output. Originally I had deemed a non-inverting amplifier by itself fit enough for purpose, ...
0
votes
1answer
39 views

Driving a Bar-graph LED Block With a Range of HV

I'm aware that it's possible to use the voltage drop of diodes to act as a step barrier for a rough ADC(?), as is done here (http://www.instructables.com/id/9-Channel-pure-analog-graphic-equalizer/). ...
0
votes
3answers
58 views

Do bi-directional level converters connect either input directly to ground?

So I have the following circuit, which is a bi-directional level converter: I am using it to convert a 5v logic signal (which at high is actually 4.2v and low is ~0.2v) to a 3v3 logic signal. I ...
1
vote
2answers
52 views

Level Shifter Circuit Question

Looking through the internet, I came across following circuit. MCU GPIO generates 0V or 3.3V Level. VDD may be 5V or 30V. I would like to use the same circuit for both purposes, which is to supply ...
0
votes
1answer
54 views

0/10V @ 5 mA input ,translated to 0/10V @0,2A output

The idea is a circuit where an analog input 0-10V (max current of 5mA input), reflects into an analog output with a minimum current of 200mA. The voltage of the analog output (Vo) must always be equal ...
0
votes
0answers
56 views

Voltage-level traslation from 3.3VCMOS to 2.8VCMOS

I'm developing a PCB GPRS Module for ZYBO from a Telit GL865 GSM/GPRS module as a base. The issue is to transform the high levels for the UART comunication between them. ZYBO (3.3V CMOS) has an ...
0
votes
1answer
104 views

I2C with 1.8V levels without level shifters?

I have problems detecting an MPU-6050 I2C device on the Intel Edison Mini breakout board (it only supports 1.8V levels). According to the thread here, it might be possible to get the sensor working ...
0
votes
1answer
69 views

Do I need a level shifter with an open drain output

I'm currently doing a schematic that has an IC that operates at 3.3V (HDC1000 for those curious), and the rest of my digital operates at 1.8V. I have a level shifter for the I2C lines, but there is an ...
1
vote
2answers
98 views

-5/0 volt to 0/5 volt logic levels?

Does anyone know a good way to convert -5/0 volt logic to 0/5 volt? I'm using a chip as seen in the diagram below, but I'm not sure what to do about the inverted logic levels. Basically, I need to add ...
7
votes
1answer
465 views

How to blink LED with 1.8V?

I am experimenting with an Intel Edison mini breakout board with pinout like here: http://fab-lab.eu/wp-content/uploads/2014/10/Edison_IO_LED.jpg Now, I soldered header pins to plug the board into a ...
1
vote
2answers
166 views

How can a GPIO logic to high amp/voltage logic adapter be built using multiple voltages? (5v, 12v, 24v)

I'm working on a project that requires making a fairly universal board (to work on different model machines). I need to hook up many pre existing motors and switches/sensors to the board that all ...
0
votes
1answer
76 views

Possible to use a voltage level shift IC for Arduino and external IC?

One of my projects require a 3.3V supply. Its an audio codec, TIs AIC3254, to be interfaced with Arduino Uno. The codec requires almost 300mA of current, so was thinking of using a level shifter ...
1
vote
1answer
70 views

High level logic level

I need to read a high level logic level betwwen 0 to 30 volts on a microcontroller input, is this is correct, thank you
0
votes
0answers
47 views

Unable to determine why clock signal is being pulled down

I have a clock signal coming out of an SPI source. This source has an output resistance of 400 ohms at 8MHz which was measured and output voltage of 1.9V peak-to-peak. The clock signal travels to a ...
3
votes
3answers
155 views

Switch (Relatively) High Voltage from Logic Level

The Situation: Basically, I would like to switch a load that requires 30v using a switch that cannot have more than 5v across it. More descriptively, I am trying to drive the anode of a VFD segment ...
0
votes
1answer
43 views

Level shifting in OPAMP and HE100T01 interfacing problem

Hi, I want to measure current of 0-50A. For that, in my application I am using HE100T01 hall effect sensor which can measure current from -100A to +100A(depending on the direction of flow it gives ...
2
votes
1answer
147 views

Pull-up resistors required on both side of level shifter?

My I2C sensor and my embedded processor do not agree on the logic level. So I need a level shifter. Normally I would put a pair of pull-up resistors on the SDA/SCL lines. With the level shifter in the ...
0
votes
1answer
45 views

uni directional logic level conversion with active drive current

I'm trying to connect an EM4095 to a cortex m0. The EM4095 requires an active high drive voltage of min 4V and has an internal pull down of 50K. Additionally it must be low during boot, otherwise it ...
2
votes
1answer
64 views

Dual (Shift Up and Shift Down) SPI Level Translation

I'm faced with an interesting challenge: I'm using a microcontroller with 3.3 V logic, but I need to use a SPI (4-wire) interface with parts operating at three logic levels, namely 1.8, 3.3, and 5 V. ...
0
votes
1answer
123 views

Converting 5 volts to 12 volts using a photocoupler

i have an arduino and i need to convert 5 volts to 12 volts in order to trigger a 12 volt Rele, i am considering to use the circuit that i attached here (below), if the "input" square is 5 volts, what ...
-1
votes
1answer
94 views

DAC Signal to AC?

I am producing a sine wave signal from STM32F3 through DAC. but since micro-controllers can not produce negative output so my output limits to positive half only. but in my application i need signal ...
1
vote
1answer
81 views

How to combine or simplify multiple 5-12V level shifters

I've created the following model for a school project. This is the first time I'm attempting to read sensors or write alarms etc. using a microcontroller. How I can improve it? To me it seems ...
0
votes
1answer
94 views

level shifting options [closed]

I want to translate or shift 1.8V to about 2.5V. Now, there are 2 ways I can go about with it. Use an op-amp based circuit as shown below - Mosfet circuitry - Which is more efficient and why ? In ...
-1
votes
1answer
89 views

How to shift level of my AC signal compared to another AC signal? [closed]

I want to shift my AC signal level. i have a floating point in my circuit (SINE wave 1 with high amplitude around 350v) which is always changing. on the other hand i have another signal (SINE wave2 ...
1
vote
3answers
80 views

level shifter alternatives using passives

I have always used level translators when communicating between 2 systems(or controllers) of different voltage levels. For eg txb0108 is a commonly used one, among a host of others. Now, why should ...
0
votes
1answer
182 views

Digital Level Shifter with Op-Amp

I'm trying to design a simple level shifter to read the digital output of a sensor into a beaglebone GPIO. The sensor output is either 0V or the 24V supply voltage, although a different supply voltage ...
1
vote
0answers
110 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 ...
1
vote
0answers
101 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 ...
0
votes
1answer
52 views

Low voltage PWM to logic level PWM

I have a sensor which constantly outputs serial data at very low voltages (in the milli-volt range), however I need to read this serial data using a PIC micro controller. How can i convert this data ...
2
votes
2answers
86 views

USB to multiple RS485

I'm trying to create a device that will control a few independent RS485 lines using single USB port. My first idea was to use GL850G usb hub controller (4 downstream ports), 4x FT232R, 4x MAX485. I ...
1
vote
4answers
125 views

High Speed Op-Amp recommendation [closed]

I am tasked with the issue of driving an IC that wants 5V input signals from an FPGA (3.3V outputs). Now, the most daunting part of it is the slew-rate requirements, with rise time \$t_r = 1.5 ...
1
vote
3answers
236 views

Level-shifted push-pull gate driver speed problems

I am designing a peak detector with a MOSFET as reset switch. I want to drive the MOSFET by the output of a CD4528 monostable multivibrator (voltage vr in the schematic below). When the N-channel ...
0
votes
2answers
102 views

Is noise a problem when using a logic level shifter?

Good morning everyone, I'm building a device that uses several bidirectional logic level translators to interface 3.3V microcontroller to 5V, 2.5V and 1.8V sensors (via I2C lines). But I wonder if ...