All Questions
Tagged with level-shifting mosfet
48
questions
0
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2
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90
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Level translation from +5V (square wave at 200 kHz) to +12V using IRF540N
I want to translate +5V HIGH, 0V LOW logic from Arduino Uno to +12V HIGH, 0.5V LOW logic using IRF540N enhancement type n-channel MOSFET. The circuit I have referred is from https://circuitdigest.com/...
- 47
2
votes
1
answer
74
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Pulling 5V logic low using 3.3V microcontroller
I have a shop-bought, small, portable dehumidifier that is controlled by a 5V logic chip internally. I'd like to be able to control it remotely using an ESP8266 or ESP32 (i.e. 3.3V logic). I only need ...
- 41
1
vote
1
answer
1k
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Method of Switching an External 5V Signal with a 3.3V Signal
I'm designing a system where I need to control the passage of a 5 V signal from one external device to another. This 5 V signal powers circuity but I am currently unable to verify what current this ...
- 11
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1
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50
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Current increase for IO Expander/Level Shifter
I’ve been designing a project recently that uses a level shifter/io expander. I’m trying to figure out the best way to go about increasing output current while still allowing the io to be ...
- 13
0
votes
1
answer
97
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Level shifting/LED driving without lower voltage rail
What's the best way to drive 3 LEDs (2 mA each) with 1.8 V signals (500 µA max) when I have only the 5 V rail (1.8 V and 3.3 V rails might not yet be available).
(For context: the LEDs are for showing ...
- 7,697
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0
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212
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How does a logic level converter with a N-channel MOSFET work?
I am trying to convert a 3.3 V digital signal to a 5 V digital signal. One way to do this is to use a logic level converter with a N-channel MOSFET and 2 resistors. I found the following schematic:
...
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0
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1
answer
87
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Understanding N-MOSFET-based 5 V->3 V level shifter
Is there a simple way to know if a transistor is open or closed that doesn't involve writing equations and assuming that the transistor is open (passing current) and then by math finding out if it's ...
- 1,067
4
votes
1
answer
249
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Understanding the characteristics of a MOSFET as a switch
Edit 4:
Thanks to the feedback in the comments I tested again and realized that the problem I describe below, with the output voltage being too low, happens regardless of whether the external device ...
- 41
0
votes
1
answer
365
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Level shifting using MOSFET
I am trying to shift the UART voltages of a 1.8 V device to 3.3 V.
I have implemented the following circuit using the RYC002N05 MOSFET:
After checking the output signal with an oscilloscope, I saw ...
- 57
2
votes
2
answers
534
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level-shifting daisy-chained data line from 5V to 24V for long distance communication stability
I need to daisy chain several WS2811 chips with distances up to 20-30m in between.
Every unit has a WS2811 chip that drives 3 DIO5151BCD10 LED drivers to control a high power RGB led. To account for ...
- 179
3
votes
2
answers
2k
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Pull-Up Resistor to 5V on 3.3V Output
I'm using a 74LVC245 buffer, which is a 3.3V chip with 5V tolerant inputs. What will happen if one of the chip's outputs is enabled and is connected to an external device with a 2K pull-up resistor to ...
- 308
0
votes
1
answer
189
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Would a MOSFET driver be a suitable replacement for this circuitry and would it reduce power dissipation in the FET?
This is a follow on from a previous question here.
I asked if replacing a MOSFET with a lower RDSon would reduce the heat generated by the MOSFET and the answer I got was that FETs with lower RDSon ...
- 707
0
votes
1
answer
175
views
magnetic rotary encoder 0.3V output voltage
I have a 24V DC motor with a magnetic rotary encoder. The encoder has a 5V supply voltage. The datasheet states that it has an output voltage of 300-700mV. I have also measured it, and it gives around ...
- 287
1
vote
0
answers
56
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Level-shifting with limited ways to change the board
I have this circuit:
simulate this circuit – Schematic created using CircuitLab
Where:
U1 is an MCU powered at 3.3V
OUT is a GPIO
the dashed box represents an external hardware that I cannot ...
- 1,235
3
votes
1
answer
386
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Using a voltage divider and an N-channel MOSFET to switch an Arduino input pin from a EL2008 Beckhoff digital output module
I need to switch an Arduino input pin (0-5 V, max current is 40 mA) from an EL2008 Beckhoff digital output module (+24 V HIGH, 0V LOW, max output current of 0.5 A) using the circuit depicted below. I ...
- 55