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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67 views

Can a resistor mitigate a maximum input voltage limitation?

I have a microcontroller running at 5v and outputting a digital signal. This signal can be high, low or high-impedance (tristated). This signal goes to an input pin on a target chip (the type of which ...
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127 views

Can I feed my level shifter with a voltage divider?

I need to level shift 3V3 to 2V8. I have a 2V8 source but that'll require some patching wires on testpads and as such I would like to avoid it. I'm wondering: would it be safe to feed the SN74LVC245AN ...
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34 views

Connecting signalling lines of the multiple devices with different power sources

I started to develop a simple device and this question arose. I need to make some uC device that will be connected to the PCI-E bus via M.2 socket. And I need this device to be working even during ...
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3answers
92 views

Level Shifting a MOSFET

I have a high current low voltage MOSFET I'd like to drive with a higher voltage and a micro to reduce power losses through it. I built this circuit based off the typical level shifting designs. The ...
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1answer
84 views

High speed logic level converter circuit

I have been trying to make a 3.3V circuit controlled by an Arduino (5V logic.) I have used a logic converter circuit similar to the SparkFun/Adafruit ones. My problem is that whenever i try to ...
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49 views

Unidirectional logic shifting (3V3 to 1V8) with minimum components?

I am trying to bypass the pushbutton of an external device (an LTE Hotspot) and switch it on using a Raspberry Pi. The pushbutton pulls down 1.8V for 2 seconds and then the external device powers on. ...
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1answer
50 views

Using a Non-Inverting Buffer for Level Shifting

I've got a project that involves a 5V Arduino and a Raspberry Pi Zero (3.3V) that need to communicate through a serial interface. The easy solution here would be to connect them through USB, but I'll ...
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2answers
78 views

50MHz clock level shifting from 1.8V to 3.3V using IC

I have a 50MHz 2ppm TCXO that I need level shifting from 1.8V to 3.3V. I looked for solutions here and decided to use a single IC solution rather than using a mosfets because I'm not confident enough ...
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42 views

I2C not working unless its through a mosfet (not level shifting)

Ive been dipping my toes into the world of hardware over the last year and I'm working on a project that i've been stumped on for a few months now. I've made progress on alot of roadblocks but this ...
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1answer
74 views

is this level shifter a dud or am i doing something silly?

i am very new to hardware circuitry and am attempting to connect a wiegand rfid and pin code reader to a raspberry pi for door access control logic. more details at: https://gist.github.com/grenade/...
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1answer
35 views

UART single-wire half-duplex level conversion

I have a single-line transmission device, I use the oscilloscope to check the waveform Always keep high potential (12V) and low potential (0V), change to logic analyzer test and find that it can be ...
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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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2answers
61 views

How do I make an io pin 12v tolerant?

I've seen plenty of 3v3 circuits that are 5v tolerant, but I'm wondering if I can make something that is 12v tolerant. Basically I have a numato 128 gpio expander and there are so many wires that one ...
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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
51 views

Bidirectional 5V-3.3V level shifter and ADS1115 resistor implementation reduction

I’m using the ADS1115 with 5V because my measuring device provides 0 to 5V measurements but since the microcontroller is not tolerant to 5V, I need to shift it down to 3.3V. I plan to use the BSS138 ...
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0answers
119 views

Convert analog piezo “transition” to digital signal

I'm trying to get what amounts to a knock indication into a microcontroller input from a piezo sensor. It's looking fairly good now at the fifth iteration, and about ready to provide digital levels ...
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39 views

Using frequency-compensated resistive divider as digital level-shifter

We have all seen the "frequency-compensated resistive divider" circuit in, for example, 10X oscilloscope probes: simulate this circuit – Schematic created using CircuitLab Has anyone tried ...
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54 views

Level converter with noisy output

I have the following circuit setup to feed a sine wave into a microcontroller. This converts the sine wave into a square wave so I can measure the frequency. The output of the opamp (U1 - OPA4830) ...
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3answers
90 views

Levelshift distorts when freq is higher than 4kHz

I 'designed' this circuit to shift a level coming from an arduino to -5/+5v signal. It simulates well in EASYEDA. I also built it on a breadboard with a symmetrical powersupply and signalgen giving ...
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2answers
94 views

Boost converter 3.3 to 5V MAX756

I want to step up my power supply from 3.3V to 5V. For this I choose the MAX756 for his price and his availability. But I don't understand the pinouts... Pin 1 : I can leave it on fly ; Pin 2 : To ...
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2answers
459 views

12v to 3.3 v logic level shifter?

For my application I have to read 12V pulses from a optical encoder into a GPIO pin of a Raspberry Pi. What could be the best solution to convert 12v HTL signals to 3.3V for RPi GPIO input? Is a level ...
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36 views

ACS712 interfacing with MCP3208 and Raspberry Pi

I've managed to capture a voltage signal from a 10Vpp @ 50Hz source, level shifted to (0-3.3V). My ADC (MCP3208) is powered by 3.3Vcc. How can I measure the current flowing through it using ACS712 (5A)...
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215 views

Level shifter using LM324 Op Amp for ADC reading

I'm want to digitize an +/- 2.5 V signal using an ADS1256. Since the IC can't take negative voltages I designed a level shifter with a LM324 to translate the +/-2.5 V signal to 0 - 5 V but I was only ...
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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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1answer
39 views

Need suggestion on 2 channel transceiver 5V to 3.3V level shifter

I need to Interface multivibrator output to control input of the analog switch. Where the maximum operating voltage of analog switch is 3.6V. So I need voltage level shifter from 5V to 3.3V. And the ...
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1answer
65 views

op-amp level shifter

I'm working on a brushed dc motor driver and I have to monitor the current. so I use ACHS-7121 current sensor. This sensor convert +-10A into 0V to +5V and have +2.5V in zero current. Now I want to ...
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2answers
94 views

Increase Rise and Fall Time of this Schematic

The following cirucit converts a 3.3V PWM signal into a +-12V PWM signal and works as expected. I want to increase the rise and fall time of the ouput signal to approx 2us. How can this be done? ...
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1answer
59 views

Overcurrent Protection Relay, How do I simulate it with Raspberry Pi?

I'm using RPi and MCP3208 to simulate an overcurrent relay. I managed to level shift the AC signal and now I get the voltage reading at 0-3.3V. As this is an overCURRENT relay, I was stuck for a ...
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1answer
50 views

Electrical Switch for LED’s (Providing enough MOSFET gate voltage)

I am designing a circuit to independently control (ON/OFF) up to 8 LED strips. So 8 independent channels The LEDs are of a single color (Not RGB). LED’s are also rated 12V. The controlling signal is ...
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3answers
116 views

Circuit to adjust -30V to +30V input to 0 to 3.3V for ADC? [duplicate]

Currently working on an oscilloscope design that would require each channel to be able to take in between 30VPP, -30V to +30V, which will go to an ADC which has a maximum input of 3.3V. What types of ...
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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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4answers
961 views

Driving a 74HC245 in one direction with 3.3V when Vcc is 5V

I have a 5V device that accepts parallel data in. That data is buffered by a 74HC245 IC (TI datasheet, NXP datasheet) where the Dir pin is hard wired to drive in ...
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1answer
73 views

Bi- directional level shifter 1.8 - 5V <-> 3.3V

I have the following issue: I2C data from various devices with VCC/IO level from 1.8V to 5V should be handled from my controller, but this just tollerates voltages up to 3.3v on IO pins. I had a look ...
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1answer
39 views

Single chip level shifter from LVCMOS to 12 V

I'm working on a nixie clock based on a STM32L476RG microcontroller and HV5530 chips. The microcontroller uses 3.3 V logic while the HV5530 really needs 12 V logic, which is a pain to implement. There ...
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3answers
262 views

Raspberry Pi with 74HC14 connecting to LED strip (WS2812B)

This might be a stupid question, but I can't seem to figure out how to convert 3.3V to 5V with the 74HC14. I have a power source which can supply 5V (see the power adapter at the left), and use it to ...
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23 views

Adding DC shift to modulation wave

I wanted to add 12V dc shift to a modulating wave of 10Vpp amplitude and 5k frequency. Can you please suggest appropriate resistor and capacitor value to be used. Best regards
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1answer
92 views

Could a resistor work as well as a signal diode in this level-shifting circuit?

The following hackish circuit uses the internal circuitry of one "sacrificial" WS2811 LED to level up the logic voltage to 5V for the remaining strip by placing a signal diode in series with the power ...
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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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1answer
72 views

How to chain I²C level shifters?

How can I chain two level shifters in a multi-master I²C system? The following picture shows the I²C bus. Due to low-voltage to the masters, the A side (low-voltage side) of the level-shifter needs ...
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1answer
61 views

Voltage Translator (SN74LVC1T45) Locking Up?

I am building a programmer for Atmel AVR devices that includes dual (5/3.3) voltage selection and an integrated FTDI chip for serial diagnostics. I'm using the TI SN74LVCxT45 series for voltage ...
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2answers
54 views

Shift 10-15v to 0-5v

I'm looking to shift 10-15v to 0-5v to read with the Analog input of an arduino. I've seen some solutions with an OpAmp but all require a negative rail which I do not have. I know I could use a ...
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0answers
61 views

Stepping Down Logic Level of a Differential Signal

simulate this circuit – Schematic created using CircuitLab Suppose I have a unipolar, differential 24V signal, and I want to step it down for use with a 5V differential receiver (such as RS-422)...
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1answer
76 views

Need help level shifting

I have an AC signal (500 - 1000Hz) 1v peak to peak that sweeps around 0v. The signal needs to be shifted to 0.5 -2V, a gain of 1.5... The power supply is +-10V. Just looking for someone to point me in ...
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1answer
477 views

How to reduce power consumption in level shifter

I need to level shift a 3.3v digital signal to 5.8v at around 1MHz. The circuit below works but the power consumption is very high. Can anyone suggest a modification which will still allow the ...
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1answer
109 views

Connection between 3v3 and 5v I2C without have a reference voltage

I've two board that must communicate trough I2C BUS. One operates at 3v3 and the other one at 5V. I unfortunately can't use a reliable level shift IC becouse the physical connector on the board share ...
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40 views

Need help with level shifting and amplifying a signal

I have a 1V pk to pk analogue signal and need to shift and amplify the voltage to 0.5-2V.The supply into the amplifier is ±10V. The frequency of the signal is 500 - 1000Hz. What sort of circuit ...
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1answer
176 views

“One way” level shifter for PWM 4PIN fan control

I'd like to make a 4 pin pwm fan control using 3v3 uC. Fan is 12v powered and I have a 12v to 3v3 converter to power uC (VCC gate is 3v3 uC power). I want to isolate 3v3 VCC and 12v as much as ...
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1answer
44 views

Voltage follower with shift

I am trying to figure out a simple application/ circuit that would allow me to shift the voltage a little bit. Lets say we have an input voltage of range from 0 to 1 V. I need an output voltage of 0.2 ...
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0answers
48 views

Significant noise observed on channels of TXB0108

We're working with a ADC chip test setup that uses the TXDB0108 to step up 1.8V data lines to 2.5V that are connected to Kintex7 FPGA. The pin-out is as follows: VCCA is 1.8V, while VCCB is on a 2....
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1answer
44 views

How to convert a +/-12 V digital signal to 0/+5 V?

What would be a simple way to convert RS-232 +/-12 V digital levels into +5/0 V respectively? I considered an optocouple, but I can't find one that can withstand -12 V reverse voltage. I considered ...

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