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Questions tagged [level-translation]

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2answers
57 views

Is my understanding of this level shifter correct?

I am considering using this TI LSF0102 level shifter in my circuit - but would like to understand, based upon its datasheet, if I have my understanding correct. My aim is to be able to supply 3.3V ...
0
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1answer
26 views

LVPECL termination impedance

I'm designing a level converter PCB using a LVPECL driver (ADCMP573) and a LVPECL-to-LVTTL translator (SY89323L). I'm reading a document about LVPECL termination schemes and there's something unclear ...
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3answers
95 views

Fast voltage translation from 3.3v to 5.7v

I need to translate a 3.3v signal to 5.7v with transition of around 60ns or less. Voltage translators such as the TXS0101 usually specify the logic high level for the input as VDD x ~0.65 (= 3.7v in ...
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1answer
67 views

Active analog attenuation with OPA2340

I wish to have active analog attenuation circuit. Following this page, I got myself some OPA2340. I use the B-side to keep the numbering somewhat intact. I go with the design on Figure 16-2 (p. 14/...
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1answer
34 views

Convert Oscillator output voltage level

I have a circuit of a USB chip (USB hub) with a custom external 24MHz oscillator. This oscillator have a max 3Vpp and the chip max voltage for XI is 2.45 with 1.8 recommended voltage. What are the ...
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0answers
21 views

MAX3023 level translator not working as expected

I'm trying to use a MAX3023 translator to make a 1.8V device communicate with a 3.3V device. For some reason only VL2 to VCC2 seems to work a bit. VCC to VL translation seems to work fine too. (didnt ...
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1answer
45 views

Latching control via active-high battery supply / regulator shutdown pin?

I'm looking to supply an MCU (3.3 V) from battery via voltage regulator: a pushbutton should enable the supply, the MCU then should keep the supply enabled until it wants to shut itself down. But the ...
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5answers
181 views

Actual reason why I have distortion in lower part of this Square wave amplifier (level translator application)

I am designing a simple Level translator using 2 transistors connected in series in LTSPICE simulator. I tried with one transistor but the output from the collector pin is 180 degree out of phase, as ...
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1answer
336 views

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 ...
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1answer
1k views

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

I'm looking to understand how to convert between 3.3V logic and 12V logic, in each direction individually and bidirectionally. I know this question has been asked before, but I'm overwhelmed with the ...
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2answers
104 views

mosfet capacitance charging question

Can someone please explain to me why the output of this level-shifting circuit starts charging from around 2.8V to 5V, and NOT from 3.3V to 5V. At the time where the output is at 5V there is a 3.3V ...
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3answers
2k views

1.8V UART with 3.3V UART

I have Quectel EC25 module comes with GPRS and GNSS in built, this module needs supply of 3.3V and it's UART works at 1.8V (default Baudrate is 115200) - But i have a processor ATMEGA2560V running at ...
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2answers
1k views

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. ...
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3answers
283 views

Proper (low power) use of a tri-state buffer when used as level shifter.

In my application, I have a 3.3v MCU driving a logic line based device at 4-5V where I need to be able to put the level shifter in a high impedance state. (This is particularly important to avoid ...
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1answer
47 views

Translating a signal to lower voltage

I'm only a hobbyist, so there is probably an obvious/better solution that i am simply unaware of. Project description: I'm trying to build a quiet linear power supply to power a mini DSP that can be ...
1
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1answer
55 views

I2C Level Translator Question

In the I2C Voltage translation circuit below, does it matter which side (SDA1/SCL1 or SDA2/SCL2) is the master and which side is the slave?
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2answers
1k views

74HC125 vs 74HCT125

I need an IC for two separate functions. The first is level translation from 3.3 V to 5V, so that I can use a TFT touch screen with an Arduino Uno. In order for the touch function to work, level ...
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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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1answer
115 views

level translator IC for SPI [closed]

In my current project I am working on the scheme and need a IC with following requirements: - It has to be a lever translator from 2.2V to 3.3V; - It has 5 channels; - on 2.2V side It has 3 ...
0
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1answer
589 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 ...
0
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1answer
91 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
635 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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0answers
106 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
415 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
253 views

Do I need a level shifter with an open drain output

I'm currently doing a schematic that has an IC that operates at 3.3V (HDC1000 for those curious), and the rest of my digital operates at 1.8V. I have a level shifter for the I2C lines, but there is an ...
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2answers
2k views

Voltage translation: 5V to 3.3V analog

I need to translate 0-5V analog signal from CASR 50-NP to 0-3.3V analog signal for the MCU's ADC. I came along Microchip's tip #16 solution. Is this a good practice? Can someone verify my design?
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4answers
127 views

Timer + voltage level translation circuit

I'm looking for a digital circuit whose behavior I will describe in a moment. It has one digital input (5V logic) and two digital outputs (12V logic). I'll hereby refer to these levels as 0 and 1, but ...
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1answer
312 views

How to shift level of my AC signal compared to another AC signal? [closed]

I want to shift my AC signal level. i have a floating point in my circuit (SINE wave 1 with high amplitude around 350v) which is always changing. on the other hand i have another signal (SINE wave2 ...
0
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2answers
469 views

Is noise a problem when using a logic level shifter?

Good morning everyone, I'm building a device that uses several bidirectional logic level translators to interface 3.3V microcontroller to 5V, 2.5V and 1.8V sensors (via I2C lines). But I wonder if ...
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1answer
107 views

Where do voltage level limitations of logic level translators come from?

When browsing through available bidirectional level translator ICs, I always see the condition that reference voltage on one side of the translator must be strictly less than voltage on the other side....
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2answers
140 views

Overcoming the logic level translator limitations

Good morning everyone, I have a STM32F407 microcontroller running on 3.3V logic level, and I have a plethora of peripherals that I want to connect to it. The problem is that these peripherals run at ...
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3answers
461 views

What does V(L) stand for in Translators?

This may be an easy question, but I do not understand why Maxim uses the letter "L" within the second supply voltage for MAX13046E. Other manufacturers like TI and NXP use names such as VCC(A), VCC(B) ...
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2answers
167 views

Level shifting 8 output IO Expander from 0V-5V to -2.3V to +2.3V

I have a circuit problem that I'm trying to find a solution for. I have an 8 output IO expander which outputs 0V-5V. It is running analog switches which have a Vdd and Vss of +-2.3V. Using the 5V ...
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3answers
2k views

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 ...
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3answers
1k views

How to level shift an analog signal?

I have a sinusoidal input signal (with a swing of 100mV roughly) centered around 100mV (DC). This signal needs to be input to a CMOS inverter. For this I need to level shift my signal around the ...
0
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1answer
253 views

Level translation and multiplexer

I have one logic 3v3-input (5v non tolerant) on my microcontroler and I want to interface 4 5v-inputs. So my idea was to connect a multiplexer supplied in 3v3 but I have seen in datasheet (for ...
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3answers
631 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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2answers
166 views

Interfacing battery to fpga

Is there any way to interface a battery with voltage range 0-5V to a fpga with ADC range at 3.3V while maintaining full input voltage range i.e 0-5V mapping on 0-3.3V. I have gone through the ...
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1answer
607 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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2answers
285 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 signal (...
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3answers
3k 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 ...
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3answers
5k views

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 ...
1
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1answer
105 views

What if there's current INTO an output pin?

maybe my question is easy to answer and maybe I shouldn't have asked it, but I'm really not sure. I would like to connect an XBee ZigBee module (3.3 V) to a microcontroller (PIC, 5V) using the USARTs....
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3answers
43k 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), ...
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1answer
206 views

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 ...
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2answers
2k views

Using BSS138 in Level Switcher

I am trying to interface 1.8v UART and 3.3v UART using NXP app note here. Unfortunately, my circuit does not perform as expected. I am using BSS138 as mentioned in Adafruit and Spakrfun. When I ...
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2answers
161 views

Voltage translation with resistor and LDO explanation

Could someone explain the voltage translation "Magic" that is happening in the circuit in the link below? Voltage Translation Magic! The YRPBRL78G13( blue on the left ) is a 5V design and the cc3000 ...
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1answer
639 views

Voltage Level Translation: LCD(5V) -> GTL2000 <-> MCU (3.3V)

I am trying to interface a micro-controller (LPC11C14) to a LCD. The LCD has Vih = 3.5V so I cannot directly connect the uC pin to the LCD. For this, I found a GTL2000 chip which looks like it might ...
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2answers
2k views

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, ...
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1answer
857 views

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 ...