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

0
votes
1answer
27 views

How to design a 3V3 device to be safely programmed by 5V ISP

I'm designing my first 3V3 circuit with ATmega8. While the uC itself supports both 5V and 3V3, some of components do not. I'm going to place ISP socket on board and I'm wondering how to ensure that a ...
1
vote
0answers
12 views

Understanding Block Diagram for Load Switch

I'm looking at the Vishay SiP32431 and am confused by the block diagram, copied below. I understand the P-Channel at the top, but what are the triangles? What is the difference in level-shifting ...
0
votes
0answers
51 views

Driving P-FET with lower voltage

I have a problem with the circuit pictured here. My aim is to drive 12V line using a uC running on 5V. I'm testing it without the uC, just shorting the in node with either GND or +5V. In both cases, ...
0
votes
1answer
28 views

IF signal amplify without delay

I have a RF Frontend that has an 4 IF signal output (2 I channel and 2 Q channel from 2 receiving anettans). Each channel of the IF has a signal rangining from 1.5V to 3.5V with a DC offset of 2.5V. ...
2
votes
2answers
103 views

I'm building a 3.3 to 5V level converter with a MOSFET but can't reach 800KHz

I've built a level converter for a digital PWM signal that runs at 800KHz. The circuit goes like this: *I'm using a BS170 transistor instead The problem is the signal gets distorted at around ...
0
votes
2answers
61 views

Arduino: RS232 Level Shifter or RS2323 Breakout needed?

I am trying to establish communications between an Arduino Mega2560 (Master) and a customised controller (Slave) via a Master-Slave RS232 link using Modbus RTU. The communication should be ...
0
votes
0answers
59 views

PWM to proportional bipolar control with push-pull amplifier. Need input and opinions

I'm putting together a circuit to control a (small wattage) TEC device in a bipolar manner. The idea is to have a micro controller put out a 3V3 PWM signal, level shift it between +- 3 V and filter it ...
1
vote
2answers
221 views

Microcontroller PWM to bipolar push-pull amplifier issues. (level shifting)

I'm trying to design a circuit that allows a micro controller (arduino) to control a voltage to a load. The load voltage needs to be bipolar in nature (+- 3 to 5 V) for use in controlling a TEC. My ...
0
votes
2answers
89 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 ...
1
vote
1answer
70 views

Purpose of Level shifter in charge pump

Why is there a need for level shifter in this circuit (charge pump)?
8
votes
2answers
1k views

What is the best way to convert 1.8 V to 5 V?

I connected HC-SR04 ultrasonic sensor, to single-board computer BeagleBoard-xM. Trigger pin requires 5 V DC. However, control pins of BeagleBoard-xM can provide only 1.8 V DC. What is the best way to ...
2
votes
5answers
607 views

Simplest uni-directional level shifter (3.3V -> 5V)

I want to drive a WS2801 LED strip from a Raspberry Pi GPIO. I have connected the MOSI and CLK pins directly to drive the LED but it is not working as the WS2801 datasheet says that a high level is ...
2
votes
2answers
140 views

Random flashing on WS2812B LEDs

I'm trying to drive a strip of WS2812B LEDs with a Beaglebone Black(revC). Because the LEDs expect a data signal at 5V and the BBB outputs at 3.3V, some sort of level shifting is required. However, ...
1
vote
1answer
95 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 ...
3
votes
2answers
300 views

Can I use 74HC14 or NPN transistor instead of MOSFET as level shifter

I have SN74HC14 or BC548 / 2N2222 transistors. I need level shifter for I2C between arduino and RPi. Here's simple circuit from the internet Problem is I don't have any MOSFETs. Can I use NPN ...
1
vote
1answer
101 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 ...
3
votes
4answers
218 views

Connecting a 9V IC's I2C interface to 3.3v Arduino DUE

I need to connect a TDA7312 to Arduino DUE's I2C interface via SDA/SCL. TDA7312 operates on 9V, Arduino DUE is 3.3v. Is it possible to safely connect it, without burning it? Or what should I use ...
0
votes
1answer
170 views

op amp level shifter no input situation

I tried out op-amp level shifters on web. The ones recomended here as well but there is a problem when no input applied. The output voltage is no seperable from the case voltage applied. As i ...
0
votes
1answer
59 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...
1
vote
1answer
183 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 ...
3
votes
1answer
229 views

MOSFET on Arduino Uno

What is wrong with this circuit? I've performed the following tests in my circuit: When I set the controller output pin PD7 to HIGH, the source/drain voltage is 0V (measured with oscilloscope). ...
4
votes
2answers
141 views

Voltage shifter distorts signal

I am trying to downshift a 5V TTL signal to 3V logic signal using NTB0102 level shifter. The connection is described below: However, my oscilloscope measurements are distorted. Even the input ...
-1
votes
1answer
100 views

BSS138 levelshifter draws 35-40mA current when one side is grounded?

I completely rewrote my question as I found the source of the issue is related to the level shifter only. This is the circuit for a 3.3V to 5V bidirectional levelshifter, used frequently. My ...
-2
votes
1answer
263 views

op amp level shift circuit diagram? [closed]

Can someone please help me with explaining the op amp level shift functioning with circuit diagram? Thank you
0
votes
2answers
79 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 ...
0
votes
1answer
70 views

NXP i2c temperature probe locking up

I have an issue with an NXP SE95 temperature probe that has been working just fine up until now on other systems. At some point, either on boot or soon after, the probe will have some sort of meltdown ...
2
votes
1answer
105 views

Why would a 5V input to a 74HC04 pull it's V_CC from 3.3V to about 4V

I have the following circuit: simulate this circuit – Schematic created using CircuitLab The SN74HC00 (from TI) has input clamps, so I am expecting the 5V logic input to be clamped to ...
1
vote
3answers
328 views

3V3 to 5V level conversion

I'm currently working on the development of some measurement equipment. For conversions I use a small ARM which runs on 3V3 and to display the results I use a graphical display running on 5V. This ...
0
votes
1answer
124 views

FET level shifter for serial does not work with inline resistor for safety

For a voltage change on a serial line I'm using a common level shifter design which uses a FET (BSS138 in this case) as so: I have two of these - one for RX and one for TX. I should add that I'm ...
2
votes
1answer
770 views

Arduino <-> BBB UART issues using bi-directional level converter (5v to 3.3v)

I am having a strange issue interfacing between an Arduino and BeagleBoneBlack over UART. The Arduino is 5v logic, and the BBB is 3.3v logic, so I'm using a bi-directional logic level converter from ...
1
vote
4answers
2k views

What is the simplest op amp level shifter?

What is the simplest op amp level shifter? That is, no gain and both inverting and non inverting configurations, for AC coupling
2
votes
1answer
194 views

Understanding 74LVC245 datasheet and current source/sink

I'm using a SN74LVC245A (datasheet) to shift 5V TTL down to 3.3V so I can read the signals with a Raspberry Pi. However I am getting really weird results (a 60Hz input signal is picked up by the Pi ...
2
votes
1answer
56 views

making sense of HCT ACT cmos “addional supply current”

I'm trying to make a low-current level shifter from low voltage (~2V) CMOS up to 5V CMOS. I had the idea to use TTL-compatible CMOS gates in the HCT or ACT families. But this line in the 74HCT04 ...
1
vote
2answers
253 views

TTL to +/- 12V conversion - what's a better way?

The context here is the pilot generator for a J1772 EV charging station. The specification calls for a 1 kHz +/- 12 volt square wave with varying duty cycle. The output is sent through a 1 k resistor ...
2
votes
2answers
527 views

Is a N-Channel Mosfet save/reliable for level shifting UART from 3V3 to 5V?

I am busy with a design that needs to connect a Raspberry Pi to an Arduino via UART. Previously I have designed a circuit that worked okay. But now I want start using SMD components and is planing ...
1
vote
3answers
120 views

I2C Level translation

In our current design, we have two devices which communicate with each other using I2C. But their I2C logic levels are different, so we need to use a level translation? Can I use a simple level ...
2
votes
2answers
76 views

Low profile i2c level shifting solution

I have a system that involves two boards and i2c communication between them. One of the boards uses 2.8V for i/o (including i2c) and the other 3.3. The 3.3V board is always the master and the 2.8V ...
0
votes
1answer
39 views

GPIO pull up to different level

I am using MSP430F235 which is supplied with 2.5V on DVCC. So, all its I/Os will be in 2.5V level. Now, I want to enable a LDO in which EN pin is tied to a different level (>2.5V is the battery supply ...
1
vote
2answers
198 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 ...
1
vote
0answers
152 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 ...
0
votes
1answer
304 views

IC to interface between digital switches (12V) and microprocessors (3.3V)

I am working on an automotive general purpose ECU where I need to interface 12V digital inputs with a µC (3.3V). The PCB space is limited, so I am searching for a single IC as an interface between ...
0
votes
1answer
366 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. ...
5
votes
1answer
488 views

i2c over gpio - level shifter

I'm quite new to this. I have just basic background in electronics. So I would appreciate an advice from someone more experienced. I would like to connect an i2c display to my tp-link wr703n (ar9331) ...
0
votes
3answers
166 views

Looking for a level translator for single duplex serial bus

I have a 3.3V UART (two pins) plus a direction selector pin (also 3.3V.) I need to talk to and listen on a single duplex serial bus at 5V with 20 mA drive strength. The signaling rate is 3 Mbit/s, ...
2
votes
2answers
146 views

Bigger resistors in place of a level shifter on a SD reader?

This item, a MMC/SD card reader module with 3V3 LDO and 10k pull-ups, has a schematic with an interesting tidbit in a big red box: Change R3, R4, R5, R6 resistance [from 2R7] to 330-470 [ohms], ...
-1
votes
1answer
130 views

Signal level shifting from +-15 to +-25

I have a bipolar signal with a peak to peak voltage of 30V (+-15V). I need to shift the signal level to be (+-25) with a dual supply voltage rails of (+-25). Do you have any ideas or a circuit ...
5
votes
2answers
3k views

Single transistor level up shifter

I need a simple, single directionnal level shifter for 3.3V -> 5V conversion. There are many options on the internet, some using a logic ic and some using 2 NPN transistors (converter and inverter), ...
3
votes
1answer
10k views

Step up 3.3V to 5V for digital I/O

I normally use an Arduino for my projects because it has 5V inputs and outputs and has 5V Vin so that makes life very easy when interfacing with 5V components. For this project I want to use a ...
3
votes
5answers
2k views

How can I switch a high-side transistor from logic referenced to ground?

Problem: I have a logic signal (represented by SW1), say from a microcontroller, that is either 0V or some low voltage, maybe 5V or 3.3V. I have a higher voltage supply (V1) and a switching device ...
0
votes
2answers
3k views

3.3V <-> 24V interface

I need to interface an ARM µC (BeagleBone Black) with a 24VDC system. 24VDC sensors and 24VDC actuators should be connected to the BeagleBone Black. I am wondered how to do this. I have found a ...