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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738 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
2k 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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1answer
416 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 ...
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1answer
1k views

I2C - connecting 5V device to 3.3V host

Is it safe to connect any 5V I2C slave device to 3.3V host? I know, that DS1307 realtime clock can be connected to Raspberry Pi (3.3V IO), because DS1307 just pulls down data lines and 5V voltage ...
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2answers
822 views

Shift 0-1.8V logic to 0-5V logic

I'm using BeagleBoard-xM McSPI to drive an MCP42050 digital potentiometer. Before using the SPI chip itself I'll try bitbanging through 3 GPIOs (but my question relates to both configurations). BB ...
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1answer
2k views

Converting 3.3v logic level to 5v using octal bus transceiver

I'm using the Raspberry PI to communicate with various sensors and other circuits that input and output 5V logic level. The Raspberry Pi itself has 3.3V GPIOs, so i need to convert the logic levels. ...
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2answers
1k views

Bidirectional Level Shifter without IC

I'd like to connect R-Pi serial to PC's RS232 port without IC (such MAX3232), using only diode (thus block negative voltage to 0V), voltage divider resistors, and common BJT. For TXD (RX from R-Pi ...
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2answers
8k views

Negative Voltage Level Shifting to an ADC

I am currently building a project that uses an AD595 analog devices chip to linearize the output of the Thermocouple sensor to 10mv/deg C. This output is to be connected to the ADC input of a Zigbee ...
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2answers
846 views

Flipping a signal

I've an input of two input lines, one being connected to ground and one carrying the signal (measured to ground). The output should be three lines with one being ground and the others measured in ...
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3answers
884 views

Arduino Serial TX to iPhone RX voltage drop?

Articles I read about this tell me to hook up a 1KOhm resistor between the Arduino's TX and the iPhone's RX. I understand this is because Arduino's signal is 5V and I want 3.3V going to the iPhone. ...
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1answer
27 views

My values for this DC block and level shifter, part of an amplifier, are incorrect. I must be missing a key concept

I am trying to find the correct component values for a leg of an amplifier. There will be non-inverting amplifiers attached to From_First_Stage_Out and To_Second_Stage_In. This part of the circuits ...
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1answer
35 views

Padding/impedance matching of a phono input

My old stereo amp got coffee spilled on it. I replaced it with the latest model from the same manufacturer. I am an old-world person, and prefer simple approaches - i.e., radio buttons to select ...
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1answer
68 views

which kind of design of level shifter suitable for high frequency data transfeing in range of 1MHz? [closed]

A circuit needed to convert 3.3V and 5V logical voltage. However, the issue was that the circuit was supposed to handle very high data transfer at or above 1 MHz and up to 16MHz. I thought of ...
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60 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
111 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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1answer
116 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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0answers
130 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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1answer
153 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
155 views

Op amp level shifting with LT1028

I have been using LT1028 in a lot of my projects to amplify bipolar signals before digitization with a (bipolar) analog-to-digital converter. Now I need to use a 5 V unipolar ADC and am trying to ...
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0answers
1k 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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1answer
227 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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2answers
621 views

Level shifter for multiple voltage levels

I found basic level shifters for two different voltages but I have 3 different voltages on my I2C bus. I just wanted to verify if the schematic below will work correctly. I think it will but I am not ...
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1answer
288 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
585 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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377 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
840 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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247 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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3answers
1k 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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3answers
1k 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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1answer
860 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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800 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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3answers
286 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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4answers
329 views

Why do charge pumps use capacitors?

https://en.wikipedia.org/wiki/Charge_pump A charge pump is a kind of DC to DC converter that uses capacitors as energy-storage elements to create either a higher- or lower-voltage power source. ...
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4answers
228 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 \text{...
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1answer
376 views

Can I pull up a 5V logic line to 12V without damaging anything? [closed]

What happens if I pull a 5V logic line (from a µC via a 74HCT245 level shifter) up to 12V with a, say, 10KΩ resistor? Is this going to damage anything? My goal is to have the logic line at the same ...
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3answers
1k 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 ...
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2answers
2k 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 ...
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3answers
148 views

Why do I get constant DC 2.5V when level shifting +/- 5V to 0-3.3V (LM741 op amp)?

I'm using RPi 3b+ with ADC (MCP3208) to monitor AC signal (+/- 5V). Since the ADC can't read negative signals, I tried to level shift it using an op amp (LM741). I tried to make this connection (the ...
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4answers
147 views

4.5 V on gate of Mosfet while switch open

I have a strange behavior with the circuit below. (the bidirectional logica level should be read as: VL = Voltage Low GNDL = GND Low VH = Voltage High GNDH = GND High L1 = Low channel 1 (I did only ...
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1answer
441 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
921 views

Level-Shifter, a resistor i dont understand

I got a lot of help in understanding this circuit in a previous post. I just don't understand the choice of R3 or why it is even there exactly. EDIT: I just read my question and realized I give no ...
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2answers
2k 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
213 views

CD 4504B from 12 V digital to 5 V digital level shifting [closed]

I need to translate 12 V / 1 mA to Arduino UNO digital input. Is CD4504B a good choice? Because I already have one...
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2answers
411 views

Driving a load on negative rail with a positive signal

I want to turn the LED on when the 5V pulse is high. I expect a simple circuit consisting of two or three bipolar or MOSFET transistors similar to the erroneous one in the image above. I don't want to ...
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3answers
93 views

I2C Level-shifting? 2N7002DW

Can someone explain this IC? It seems to be a two-way n-mos (has two circuits in one). I have a master device that runs on 5V and multiple slaves that run at 3V3 and they communicate via i2c. Why ...
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3answers
117 views

Shifting level voltage of a signal

I have a signal, which can vary from 400 to 7000 Hz approximately. It is a kind of pwm signal and has the time of high level, Ton, 30 times longer than the time of low level, Toff. The shape of the ...
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1answer
63 views

LEDs flicker when I move my circuit

I'm building an LED driver circuit, CD4504B and TLC5916 controlled by a Raspberry Pi: simulate this circuit – Schematic created using CircuitLab I'm finding that sometimes when I move the ...
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3answers
860 views

Level shifter for WS2811 led strip

I'm trying to control a WS2811 Led strip with an ESP32. I'm using a logic level shifter to convert the 3.3V output of the ESP32 to 5V. I bought this level shifter (txs0108e) https://fr.aliexpress.com/...
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3answers
3k views

Problems with a two-diode 3.3V -> 5V level shifting circuit

I'm trying to drive a strip of 57 APA102 LEDs from an ESP8266. Driving just one LED directly (without level shifting) with a very short (about 10 cm) bus seemed to work, even though the APA102 ...

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