Questions tagged [logic-level]
Logic level refers to the input and output voltage levels of digital logic, which is often 3.3 V or 5 V.
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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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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 ...
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Translating to "below ground" logic levels
I have an RF switch chip that is controlled by a logic signal with levels of 0 V and -3 V.
I want to control this from a CPLD that's producing ordinary +3.3 V CMOS levels.
Board area is at a premium ...
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Replace BSS138 with AO3400A in level shifter circuit
I have to use level shifter circuit to interface MAX31855 with Arduino running on 5V.
I found easy to build level shifter circuit at SparkFun website. It is using BSS138 (datasheet) which I don't ...
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5V to 3.3V logic level converter
I am trying to connect an ESP8266 module to an Arduino. Giving the fact that ESP8266 runs at 3.3V and the Arduino at 5V i need a logic level converter from 5V to 3V3.
Is there a way i can build one ...
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Ignore Pulses Less than a Given Width in a Pulse Train
Let's say I have a 5V pulse train that varies between 0 and 75000 pulses per second. Pulse width, let's say, is 5 microseconds. How could I calculate or determine the best way to filter out all pulses ...
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Understanding how this bi-directional logic level shift works
I'm having a bit of trouble understanding how this logic level shift circuit works exactly. The design is from Sparkfun.
Hhere is the schematic:
For my application, the LV and HV are the 3.3V and 5V ...
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Logic Levels between 5(V) and 3.3(V) devices
I am using a 5V microcontroller to communicate with a Bluetooth module operating at 3.3V.
I have regulated the output from the 5V microcontroller rail to 3.3V rail for the Bluetooth module.
Since I ...
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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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Using Mosfet with seperate Logic Converter and Arduino
I am trying to use an IRLB3034 with an Arduino even though it is not a logic level MOSFET. I am planning on using an LM2937 12v regulator like the schematic below:
The connection going off the page ...
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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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Should I use CMOS vs. TTL?
Now, I know that this question has been asked so many times that it seems like I'm trolling, but I must point out that I couldn't find the right answer to this question anywhere.
So yeah, CMOS and ...
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Does a BJT controlled relay need protection diodes?
I am fairly new to electronics, so please pardon my mistakes.
I am attempting to build a Wi-Fi controlled relay. The problem, however, is that the relay runs on 5 V, but my ESP-12E can only ...
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High Frequency Logic Level Conversion
I am using Arduino DUE for my project which gives a 3.3 volt output signal. I have to convert it to 5 volts to use it with another device. The problem is that my signal frequency is 1 MHz. I have ...
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Switch (Relatively) High Voltage from Logic Level
The Situation:
Basically, I would like to switch a load that requires 30v using a switch that cannot have more than 5v across it. More descriptively, I am trying to drive the anode of a VFD segment ...
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