Mar 14, 2012 · While reading a datasheet for an IC I came across the pin voltages being presented as 3V3 or 1V8. What does this representation stand for?

Jan 21, 2026 · Any simple/clean involving the least amount of components (tight space constraints) solutions to redesign the board such that this status pin also triggers a 3V3-tolerant interrupt? LE: …

Jun 22, 2021 · The Raspberry Pi Pico seems to have a 3.3V_EN pin which is basically the 3.3V regulator enable pin (3V3_EN) pulled up to 5V through a 100K resistor internally. I am confused how …

Jan 1, 2026 · Here is the link to the schematics by the way: Schematics Link There are various instances of pins labeled CHIP_PU or VCC_3V3. How should I connect these pins to each other? …

Feb 4, 2022 · I am trying to design a circuit to control a G6S-2 12V relay that powers on/off a 12V device using a GPIO from an ESP32-WROVER and one PC817 optocoupler. This is the circuit that I have …

Feb 29, 2024 · Validate my 3V3 power system Ask Question Asked 1 year, 11 months ago Modified 1 year, 11 months ago

Jul 21, 2020 · What I'm trying to do This question is about the use of any 3V3 supply microcontroller to drive 5V powered relay modules which are available from many suppliers. I have provided details …

Oct 28, 2022 · Can I safely power a LED with 3.3 V without a resistor? I have some LEDs that I typically power with 5 V and a 220 Ω resistor, but I can only supply 3.3 V at the moment. Additionally, I have …

Apr 6, 2021 · How to switch best between two voltage sources (5V & 3V3) for a "load" (e.g. a sensor in the application field or Arduino/Raspberry Pi/etc.). The basic setup is as follows: there are two …

Jan 13, 2026 · Thanks for your response, so just to clarify a bit further there wouldn't be anything inherently wrong with power plane (3V3 red)? Could I simplify the design even further by removing …