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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344 views

How did this simple nmos level shifter break my STM32?

I'm trying to read some 12V square wave signals from an old car with an STM32. I built some level shifters like shown below to down-shift (and invert) the signal so I can hook it up to an GPIO. ...
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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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1answer
756 views

3.3V to 5V PWM level shifting - ARM microcontroller

I am working with an STM32F0 running at 3.3 V. I'm trying to drive a motor controller with PWM from the microcontroller. The motor controller requires an analog input of between 0 - 5 V to control the ...
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3answers
111 views

Resistors to make an 74hcxx IC behave like a 74hctxx IC

I made a circuit that is supposed to detect when all 8 output lines are logic high. I connected the inputs of a 74HC30 (8-input NAND) to the data lines of an AT28C256 (ROM). After a while, I checked ...
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2answers
7k views

Changing a 3.3V signal to a 5V signal using a BJT transistor

I saw someone asking this EE.SE question in a thread over 2 years old and could not really understand some things about the answer. He had a 3.3V input signal that he wanted to change into 5V signal. ...
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3answers
2k 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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1answer
128 views

at89s52 the right way to drive transistor

I want to ask about this configuration, the port is connected to at89s52 pin (not P0) and some of my friend say that this should work because the at89s52 have internal R that can replace the external ...
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2answers
388 views

Shift an analog signal by a certain voltage, keep the amplitude

A sensor outputs a dc voltage varying between precisely 1.00 volt and a max of 1.10 volt. The receiver operates between 0.00 volt and 0.10 volt. How can I level shift the 1.00 to 1.10 dc voltage to 0....
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5answers
984 views

3.3v to 5v conversion with non-5v tolerant part. (single npn transistor?)

I was wondering if I can convert 3.3v to 5v when the 3.3v part isn't 5v tolerant. I was thinking of using this layout: However I'm not sure if the gpio pin will get 5v "for a second" or if this is ...
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2answers
791 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
240 views

Interfacing 5V to 3V3 devices - MAX3377 damaging my board

I am using the bidirectional MAX3377 level translator by maxim. I am doing a prototype board and as I test this board piece by piece, everything works until I solder on this part, and my 3v3 rated ...
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1answer
2k views

Is it possible to use a simple diode and pullup resistor to level shift down in one direction?

I'm working on a circuit that involves interfacing with a 3.3v microcontroller (ESP8266) and I'd like to be able to program it using my existing FTDI which operates at 5v. I'm new to level-shifting ...
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1answer
168 views

Translating a 1.8 V FPGA pulse to 24 V pulse to power a solenoid

I am designing a board that will interface between a FPGA board and solenoid that powers a pneumatic system. The signal coming from the FPGA is a LVCMOS 1.8 V signal. Current from the FPGA signal is ...
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3answers
3k views

How do you shift a square wave down?

I have a square wave the oscilates at 25khz from 0 to 30v. I would like it to oscillate from -15v to +15v. Is there a SUPER DUPER SIMPLE circuit to do this? Keep in mind it's going up and down at ...
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1answer
2k views

Powering 3.3V I2C from Arduino 5V?

I need my Arduino to communicate with a fairly sensitive 3.3V I2C device, and am using a Bidirectional Level Converter to step down the voltage. However, I still need a 3.3V source (for the I2C ...
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2answers
1k views

2N7000 level shifter doesn't work under a certain voltage

I need to convert a 1.8V UART line to 3.4V. I don't have the 1.8V voltage reference available, but I have the 3.4V reference, so I'm using a voltage divider to get about 1.8V. This is my circuit: ...
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2answers
183 views

UART: interfacing b/w 3.3V and 2.4V - current limiting resistor

I need to interface a 2.4V IC and a 3.3V IC via UART i/f. The VIH spec of the 3V3 IC is low enough to allow UART_TX_2V4 to be directly connected to UART_RX_3V3. My main concern is the UART_RX_2V4 pin ...
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1answer
190 views

FTDI VCCIO = 2.4V

I am using an FTDI chip for USB-UART conversion. The UART i/f on the MCU operates on 2.4V. Typically the VCCIO pin that powers the UART i/f on the FTDI IC is driven by the 3V3OUT pin [3.3V]. While the ...
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1answer
133 views

I²C interface between 3V/5V sensor and a 2.4V MCU

simulate this circuit – Schematic created using CircuitLab I have an ultra low power application where the minimum VDD of my temperature sensor (ADT7420) is 2.7V, while I need to run my MCU at ...
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1answer
1k views

5V to 3.3V Level shifting circuit

I am interfacing an SD card to the Z80, one of which uses 5 V logic (Z80) and the other uses 3.3 V logic (SD). I believe the 3.3 V to 5 V level shifting will be taken care ...
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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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2answers
4k views

What can I replace a BSS138 N-Channel MOSFET with?

I'm replicating this level shifter by Sparkfun but they use a transistor that I don't have. Frankly, I know next to nothing about transistors so reading the specs is way over my head at this point. ...
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1answer
355 views

level shifting high speed signals

I have a host of differential signals from a board thats 3.3V. Now, I need to interface it to a board that can accept 2.5V. Now, is it possible to use a standard level shifter like this ? Is there ...
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1answer
674 views

What's the purpose of this diode in this level-shifter?

look at this circuit: I don't get that what's the usage/purpose of the BAS316 in this circuit?
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2answers
72 views

Help with Texas Instruments SN74LVT125

I am interfacing a 5V system to a 3.3V using the SN74LVT125 to shift down TTL voltage to 3.3V My problem or my question is, Some of the input pins (the A ones) are being triggered by a 5V signal that ...
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2answers
529 views

Level shifting in HV CMOS processes

I'm working on a project for which custom ICs are being designed by another person on the project. The process being used is a mixed voltage CMOS process which uses a \$1.8\mathrm{V}/5\mathrm{V}\$ ...
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1answer
698 views

Level shift from 5V to 3.3V (and vice versa) using 74HC4050N,652

Below you will find a link to the datasheet for 74HC4050N. My order I placed had a suffix of ",652" on that part, but I'm not sure what that number refers to. http://www.nxp.com/documents/data_sheet/...
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1answer
735 views

How to connect a CD40109BE Voltage Level Shifter

I have a circuit requirement using a Texas Instrument CD40109BE Voltage Level Shifter. This chip incorporates 4 low to high level shifting circuits. I plan to use two of these circuits, A and B with ...
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4answers
274 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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1answer
114 views

Need a level shifter, is there an IC which does what I want?

I need to change 3 signals (I1,2,3) which will be at around 2V to get shifted to 5V (in one direction only to O1,2,3). This schematic should do the job, but does anyone know if: a) there's a better ...
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1answer
726 views

Multiple SPI devices with different logic levels

I'm going to use one of the PIC32MX795F512L SPI peripherals (master), 1 to 4MHz, to communicate with multiple devices (slaves): Wi-Fi module MRF24WG0MA (3.3V); uSD card (3.3V); 9 modules with sensors ...
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1answer
116 views

IC switching signals with different voltage levels [closed]

I am reading about ICs and wondering if there are some ICs (and how to differ those) that can do a task which I will describe below. I have several digital outputs from Arduino. Those signals are ...
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1answer
3k 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 ...
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3answers
769 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 ...
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3answers
1k 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 ...
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1answer
123 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 ...
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1answer
167 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 3....
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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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1answer
255 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 ...
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2answers
599 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 ...
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2answers
446 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
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1answer
480 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 ...
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1answer
83 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 ...
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1answer
430 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 ...
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1answer
65 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 ...
3
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2answers
780 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 ...
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3answers
956 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, ...
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1answer
860 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 V-...
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1answer
174 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/). ...
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3answers
667 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 have ...