What does 3V3 or 1V8 mean? - Electrical Engineering Stack Exchange
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?
How to correctly power an ESP32-H2 board with a battery
May 10, 2024 · I'd like to power my ESP32-H2-DevKitM-1 board with a 3.7 V, 2000 mAh Li-po battery. For this I think I must use this pin: Battery-3V3 The above picture is from the Pin Layout section of the
Converting universal AC to 3.3 V DC @ 0.1 A
Nov 18, 2025 · I would seriously consider plugging in one of those tiny USB chargers for mobile phones, like the HTC chargers, and an LDO to bring the voltage down to 3.3 Volts, if this is a small run. For …
Switching 3.3V with 3.3V signal - Electrical Engineering Stack Exchange
Jul 12, 2024 · The ESP32C3 has a battery input and a regulated 3V3 output, and the DFPlayer takes 3.3V power, so that would seem to be a straightforward way to power the circuit.
stm32 nucleo 3.3V usage - Electrical Engineering Stack Exchange
Jul 16, 2021 · When using an STM32 Nucleo powered by a 5V power supply, can I use its 3V3 pin to supply 50mA? Or do I need to use, for instance, a 3.3V linear regulator attached to my 5V power …
Powering Components with ESP32 - Electrical Engineering Stack …
Dec 22, 2021 · The 3V3 output is just the output of the LDO on your ESP32 module, you can use it to power your 3V3 sensors, like the TSOP that requires 3V3. You can use the RC filter shown on …
Raspberry Pi Pico 3.3V_EN pin control voltage inquiry
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 …
MCU working at 3.3V and RS485 driver at 5V - how does this circuit …
Apr 15, 2022 · I see no reason why this shouldn't work, at least for a "dirty solution". The inputs (driver input, driver/receiver enable) are recommended to be below 0.8V for a logic low and above 2V for a …
What's up with the operating voltages 5 V, 3.3 V, 2.5 V, 1.8 V, etc.?
Integrated circuits seem to have standard voltages of 5 V, 3.3 V, 2.5 V, 1.8 V, etc. Who decides these voltages? Why do smaller devices require lower voltages?
Is a 5 V or 3.3 V supply voltage better for a microcontroller based ...
May 22, 2025 · I am about to design a new microcontroller based project. I checked all components (few) and all can operate at 3.3 V or 5 V. The microcontroller itself can also operate at 3.3 V or 5 V …