Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [level-translation]

96 questions
26
votes
2 answers

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), but I never found an option using only a single…
Nicolas D
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3 answers

Driving high and low inputs of a MOSFET driver with a single PWM signal

(A typical circuit from FAN7390 datasheet.) I have high-side and low-side MOSFETs to drive. I read dozens of MOSFET driver datasheets, all of them have two separate inputs for controlling high and low side MOSFETS independently. However, my control…
hkBattousai
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5
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2 answers

MOSFET and clamp on I2C interface lines as level tranlastor

I'm trying to understand what's going on in this circuit: I understand the master direction. I2C lines usually are pulled up by default, so when the line is high or idle, the GS voltage < 0.7V, which means the mosfet is off. With it off, the Drain…
stanri
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4
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1 answer

Interfacing a PIC microcontroller to different logic levels

I'm planning on interfacing a PIC microcontroller to two devices which operate on two different logic levels and I'm wondering what the best way of approaching this is. I'm rather inexperienced in this area and was hoping to get some ideas on the…
user1242670
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4
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1 answer

What is the difference between a voltage-level translator and a logic-level translator?

(This is a follow-up to an earlier question of mine.) I would like to use the GTL2000 bi-directional translator IC to facilitate level translation between a 3.3V circuit and a 5V circuit (including bi-directional Digital and Analog I/O, SPI, I2C…
boardbite
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4
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2 answers

Interfacing microcontroller with 1.8V logic

I am in the process of selecting a microcontroller to interface (~30 signal lines) to an FPGA that operates at 1.8V voltage levels. I have found NXP's Cortex M0's to operate down to 1.8V which is great, but the bulk of Cortex M3 chips out there have…
cksa361
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4
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2 answers

How to scale and shift voltage signal?

I want to scale and shift my voltage signal by below relation: $$ V_{out} = \frac {10} {12} \cdot V_{in} - 10 $$ Indeed my primary voltage is from 0v to 24v and I want to put it from -10v to +10v. I try to use the below circuit but its gain is…
Pana
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4
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2 answers

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 signal (out of the microcontroller pin-pin connected)…
Nazar
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3
votes
5 answers

Is it legitimate to level shift down a logic input with just series resistance?

In this particular instance, I'm using a STWD100NYWY3F with a 3.3v Vcc and feeding it's !EN input from a 5v TTL signal (from a SN74LS00D). The absolute max input is Vcc + 0.3v. I propose to just put a 10 kΩ resistor between the source signal and…
nsayer
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3
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3 answers

Level transformation 0/+5 V TTL logic to +/-9V how to maximize gain and frequency range (DC to 4 MHz)

I see a lot of repeat answers and instructions how to convert dual supply levels to logic levels, but I have the inverse situation, converting 0/+5 V TTL logic to +/-9 V, and I don't see a lot of info about it. Strange, this should be very common…
Gunther Schadow
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1 answer

Design Review: 3.3V Logic to 12V Logic (Uni-directional and Bi-directional)

I'm looking for feedback and improvements on my design below. Specific questions are at the end. I created this as an attempt to answer my own, previous question. From my feedback there, it seems like I needed to be more clear in my…
jakekarnes42
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3
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3 answers

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 is how do I amplify the voltage on a GPIO output…
Billy Bob
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1 answer

Logic Level Translator caveats

I have a device that runs on 2.5Vcmos logic levels, there are about a half dozen ic's with a mixture of parallel and serial (TWI and I2C) signal lines. Rather than placing my own uC on the board I'd rather have a arduino compatible header so I can…
crasic
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1 answer

Circuit for 4-20mA to I2C conversion

Hello I have a circuit that takes a 4-20mA reading from a pressure transmitter and converts it to analog 0-5V then to I2C. But it doesn't seem to be reading I just see about 0.5V on the serial monitor regardless of if the transmitter is connected…
Feynman137
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2 answers

Self-adjusting analog signal translator

I think this question is best asked on concrete-ish terms, so, here it goes. Let's say we have 4 wires, all with common ground: A) ≈9V-20V, varying. B) ≈3V-6V, varying. C) A low frequency analog signal (<1kHz), which can vary from 0 to A. D) In…
Ben Tait
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