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Questions tagged [logic-level]

Logic level refers to the output voltage levels of digital logic, which is often 3.3 V or 5 V.

23 questions with no upvoted or accepted answers
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MCU HIB pin only pulls Buck/Boost EN pin every-other Hibernation

MCU: TM4C1294NCPDT Buck/Boost Converter: TPS63051 Hib dedicated LDO: MIC5504-3.3YM5-TR I have a LiPo battery coming into the board, feeding both the TPS63051 and the MIC5504. Tiva's HIB pin is ...
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3answers
52 views

N-Channel Mosfet or NPN transistor for Low Power PWM Application

simulate this circuit – Schematic created using CircuitLab LED: 2.05V @ 350mA 5-6 Ohm Resistor for current regulation Hi, currently designing a circuit that controls a LED using a PWM logic ...
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1answer
106 views

5V digital output to 24V

I'm sure it is a simple solution but I am new to this so please take it easy. I need to come up with something to convert a 5V digital output signal from a USB-1608G DAQ device with DIO to 24V ...
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49 views

How do I wire a Rasberry Pi 3B+ to a WS2812b RGB strip?

I am working on a project where I need to use a WS2812b RGB strip. I am really worried because I have already burnt 2 Raspberry Pis with my wiring. I just want to show my schematics, and be assured as ...
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1answer
1k 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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47 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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30 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
71 views

Would this MOSFET be suitable for use with an Arduino?

I'm looking for a MOSFET which can be controlled by an Arduino at 5V, and which can switch power on/off to a Raspberry Pi and peripherals (also 5V) that will peak around 3A of current. It's a battery-...
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57 views

Logic Level MOSFET IRLZ44N - under Wemos mini

I used IRLZ44N with Arduino Nano in order to dimm a 12v LED strip. When tried to use it with Wemos Mini - I get only 7.6v max ( when controlling a 12v source ). Probing the output pin (...
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1answer
76 views

CAN Rx Line between STM32 and MCP2561

I discover a problem on my design, with a STM32F042K6 MCU and a MCP2561 Can Transceiver. I can send some frames on the CAN Bus but i can't receive any frames. When i put my scope probe on the CAN Rx ...
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PX4FLOW (Optical Flow sensor) - Powering with 5v. Does it work with OmniNXTF7 I2C SCL/SDA at 3.3v?

I want to use PX4FLOW with OmniNXTF7 flight controller. This flight controller has 3.3v I2C SCL/SDA and no PullUp-resistors. I use the PX4FLOW only with I2C port, with 5v at VCC (not 3.3v). Does ...
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1answer
66 views

Switch from 5v to 24v - 150kHz - 20mA

I'm looking for a way to amplify a signal from 5v -> 24v. This signal is a PWM with a frequency of 150kHz. Amplified signal will have a fixed load of 20mA to power a LED with a Vf of 1.25v. I've ...
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Logic leves and protocol, interfacing HP39GS to arduino Wemos D1

Im trying to connect HP39GS scientific calculator to Wemos D1 arduino. It has TTL RS-232 serial port. Pinout is somewhat: Vcc, TX, RX, GND. Looks like HP39GS protocol for serial port is not pure RS-...
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1answer
37 views

3v3 VLogic for DG212

I am curious if anyone knows if a Vishay DG212 works with VLogic being powered by 3v3? The only test conditions the datasheet speaks of are where VL is being powered by 5v. Here is the datasheet: ...
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44 views

trigger a circuit using one time signal

I'm really new to electronics and I need help. Say I have Line A. I need to control Line A to set it as HIGH or LOW using a one time signal through one input line X or maximum through two lines X and ...
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47 views

ESP8266 + Logic inverter on Tx = Failure to boot ?

I'm programming an ESP-12E module using the Arduino support package. My setup requires a logic level inverter on the Tx pin (only). I built the following which is working OK : simulate this ...
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1answer
170 views

How can I have an ECL logic input for a CMOS logic gate

I'm working on a triggering system that uses a comparator to check if the signal is below a threshold value. I found a great comparator for the job, except its output is ECL logic. I wanted to use the ...
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168 views

How to convert this ASM diagram to register transfer level?

So we have this ASM diagram, which I have to convert into register transfer level. I have already done some similar examples and I will usually start with defining next-state logic, than output ...
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1answer
77 views

PWM logic level issue

I am facing new problems everyday at embedded system. I have designed D-SMPS and put an stm32f103 to drive mosfets.I have tested micro controller and it works well while giving outputs as GPIO.It is ...
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2answers
105 views

STM32F4 and SIM800L logic level

I am currently using an STM32F401RE that I have to interface with a SIM800L GSM module via UART. In a first "toy example" I used Arduino and found no problems, but passing to the STM MCU I am unable ...
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1answer
66 views

Question regarding MCU, Voltages and Level Shifting

I have a board with a 3.3v MCU (C8051F850 from Silicon Labs in a QSOP-24 package) but whose pins are 5v tolerant. The board is running at 5v and all the relevant GPIO pins from Ports 0 & 1 have ...
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2answers
676 views

Three Way Light Switch using Two Binary Switches

Somebody presented me with an interesting problem that I can't seem to figure out. Is it possible to build a three-way switch circuit for a light bulb (akin to common household light fixtures) using ...
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1answer
528 views

What is quad 8:1 MUX?

In my assignment i'm asked to show a block diagram for quad 8:1 Multiplexer. But i have no idea what the word quad means in this question. Can someone help me?