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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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 ...
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0answers
36 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 ...
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1answer
65 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 ...
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1answer
61 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 ...
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2answers
81 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 ...
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1answer
435 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 ...
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2answers
58 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 ...
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1answer
61 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 ...
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1answer
64 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
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39 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 ...
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3answers
124 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 ...
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38 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 ...
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1answer
132 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 ...
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1answer
33 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 ...
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1answer
52 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. ...
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1answer
85 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 ...
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1answer
61 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 ...
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1answer
72 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 ...
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1answer
90 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 ...
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1answer
71 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 ...
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3answers
67 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 ...
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1answer
112 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 ...
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74 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 ...
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96 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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1answer
50 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 ...
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2answers
75 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 ...
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4answers
122 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 ...
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3answers
134 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 ...
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2answers
91 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 ...
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1answer
61 views

Where do voltage level limitations of logic level translators come from?

When browsing through available bidirectional level translator ICs, I always see the condition that reference voltage on one side of the translator must be strictly less than voltage on the other ...
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2answers
77 views

Overcoming the logic level translator limitations

Good morning everyone, I have a STM32F407 microcontroller running on 3.3V logic level, and I have a plethora of peripherals that I want to connect to it. The problem is that these peripherals run at ...
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131 views

Level shifting digital signals with a comparator

I'm trying to understand the voltage levels associated with a comparator used for level shifting digital signals. The comparator is the MAX995. The input voltage levels are +1.5V/-2V, and the output ...
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107 views

Connecting 3.3V periperals with 3.3V or 5V MCU

I'd like to connect various 3.3V perpherals to works with either 3.3V (i.e. Arduino Due) or 5V MCU (i.e. Arduino Atmega2560). Here is a basic diagram: The system is consists of two parts: ...
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6answers
348 views

Level Shifting Arduino 5v to 1.8v

I am trying to level shift 5v from the Arduino to 1.8v. I have hooked up the level shifter as pictured below. However, I am not getting 1.8v from pin A1. Can you please tell me what I am doing wrong? ...
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4answers
73 views

Can I use a line multiplexer as a level shifter as well?

I have 40 x 5V inputs that I want to read using 3V GPIO pins on the beaglebone black. I am planning on using 5 multiplexers (such as the 74HC151 or 74HC251) that will be sharing the 3 select lines. ...
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1answer
109 views

Connecting BeagleBone Black to an Arduino

I am a software guy (everyone immediately downvotes...) trying do the following: (1) On a BeagleBone Black ("BBB") I am driving a GPIO pin high in software. (2) Then I am sending PCM (audio) out ...
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1answer
90 views

Logic Level Shifter

I am trying to connect two devices on a PCB. One operates with 3.3V digital high and the other works with 5V digital high. I actually grouped the input and output pins (There is no bidirectional ...
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2answers
47 views

Can I, Bi-Directional Level Shifter as Motor(3V) controller with Arduino Lilypad (3.3V)?

Basically this could be easily done by using a BJT NPN, but since I want to control two motors(3 V, 45-60mA) and 5 LEDs was thinking of using a Bi directional level shifter instead of using ...
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1answer
105 views

How does a bidirectional level shifter work?

I have the following circuit with an NPN HEXFET Q1 (BS170) Correct me if I'm wrong: When the TX-3V3 microcontroller is 3.3V i.e. logical 1, the TX-5V is a ...
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3answers
243 views

pull down resistor in PIR circuit

I have an motion sensor circuit. The circuit calls for a voltage of 2-15 dc volts. On the PIR data sheet the source pins calls for a pull down resistor of 47K at 5 volts. My question is if I use 8 ...
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52 views

Level shifter vs Translator…bits, channels and outputs per channel

I'm looking to do 3v3 to 5v to allow a micro to control a set of servos but I'm having a hard time with the marketing terminology... What's the difference between a level shifter and a translator? ...
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212 views

Why does 3-to-5 volt with transistor not work the way it should?

A quick google for "3v to 5v transistor" gives me dozens of circuit diagrams that look like option A below with a NPN transistor and a pull-up resistor. If I build the diagram in iCircult, it work as ...
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2answers
127 views

Logic Level Converter only works reliably when multimeter attached

I have this logic level converter that only lets data flow when my multimeter is set to measure milliamps and the leads are placed across the high and low signal pins. On the low side I have an ...
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2answers
180 views

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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1answer
117 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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2answers
99 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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3answers
978 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 ...
3
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1answer
235 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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1answer
98 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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2answers
355 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 ...