All Questions
Tagged with level-shifting logic-level
90
questions
0
votes
2
answers
50
views
Will the frequency change when converting the ESP32 3.3 V logic to 5 V logic using a TXS0108E?
The GPIO on ESP32 (S3) are all 3.3 V logic. I want to control an ESC for a drone. The manufacturer says:
The ESC will use a standard 5 V PWM signal at 50 Hz between 1100 µs and 1950 µs. 3.3 V output ...
- 1
0
votes
3
answers
100
views
Logic translator between different ground references
I need to translate a 1.8 V digital signal ("power good" from a DC-DC converter) from a "floating" voltage domain to a 3.3 V signal referenced to a fixed system ground.
The source ...
- 21
0
votes
4
answers
349
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Level shifting from 3.3V to 5V not working: voltage drops when attaching load
I am trying to trigger a laser using an Arduino. I used a power supply to determine that the laser needs a 3.5V (or higher) signal, at which point it draws around 2.2mA from the power supply. When ...
2
votes
0
answers
95
views
Adding level shifter circuit conflicts with other microcontroller peripherals
I'm working on a synthesizer with multiple functionalities (OLED I2C screen, encoder, audio, midi input, several keys input) on a Xiao RP2040.
I wanted to add a PS2 keyboard input.
RP2040 GPIO are 3....
- 41
2
votes
4
answers
189
views
Interfacing Delta PLC and Arduino (Logic Signals)
I am trying to connect a Delta PLC (DVP-10SX) to an Arduino UNO. What I'm trying to achieve here is to be able to exchange Logic signals between both the PLC which has a logic level of 0-24V and ...
- 21
0
votes
1
answer
136
views
Unable to read data through a MAX485 module
I used arduino code in order to grab RS 485 data from a sensor.
The middleman is a MAX485 module.
However, I was unable to read the data, even with code that works from previous examples.
I hooked up ...
- 1,369
5
votes
6
answers
2k
views
Switching line between 5 V and ground using a 3.3 V signal
I am working with a PCB which looks like shown below. Switching the central line between 5 V and ground toggles the LEDs.
I had this PCB connected to a 5 V Arduino dev board where the switch line was ...
- 53
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votes
0
answers
131
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Do I need to level shift the PWM signal from a Raspberry Pi Pico for regular RC servo?
I am trying to control regular SG90 servo with a Raspberry Pi Pico. My problem is that those servos produce maximum torque while powered by voltage between 4.8V to 6V (5V is optimal for me.)
I powered ...
- 29
0
votes
2
answers
57
views
Can I pull down with 5V logic a not-level shifted (which is at 2.8V logic pulled-up) input? How to pull it up to 2.8V again, with no level-shifters?
I have a Distance sensor which has an enable pin (XSHUT pin in the diagram) which is pulled high in its own PCB module at 2.8V, to enable it to work. My Attiny85 MCU, which controls the sensor, is at ...
- 567
0
votes
0
answers
68
views
Level shifter breaks down (repeatedly)
I created a Dometic Airco thermostat using esphome on an esp chip. The Dometic is expecting 5V on the serial control line, not the 3.3V coming from the esp.
So I implemented a simple circuit using a ...
- 1
0
votes
1
answer
97
views
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
0
votes
0
answers
212
views
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:
...
- 1
4
votes
1
answer
249
views
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
55
views
Interfacing LTC2492/6/8 via SPI: is voltage shift needed?
I'm a bit confused with datasheet for LTC2498. It says on page 27, section "Digital Signal Levels":
The LTC2498’s digital interface is easy to use. Its digital
inputs (SDI, fO, CS, and SCK ...
- 103
2
votes
2
answers
268
views
Logic Buffer for SPI level Shifter 74LVC126
I am using 5V logic microcontroller and I want connect the Hardware SPI bus to SD CARD and Ethernet chip(W5500). Using below circuit I am not able to initialization SD card.
Below is my schematic:
...
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