Can i attach voltage in to the 5v pin? i'm trying to put this on a pcb. will it have the same voltage regulation?

As a previous contributor wrote: a lot of people answering questions here do not know what they are talking about! So here is the answer copied straight from the Seeed Studio webpage regarding this board: "Note For general I/O pins: Working voltage of MCU is 3.3V . Voltage input connected to general I/O pins may cause chip damage if it' higher than 3.3V . For power supply pins: The built-in DC-DC converter circuit able to change 5V voltage into 3.3V allows to power the device with a 5V supply via VIN-PIN and 5V-PIN. Please pay attention to use, do not lift the shield cover."

Does this come with a bootloader or not?

yes - I'm pretty sure it does. Its been a while since I played with it. But I seem to recall all was needed was to download the necessary Arduino files into the Arduino programming system and make the correct connection to the device. However be aware the device is finicky in that it needs to be rebooted for programming mode using a jumper wire. So if you're doing a lot of development/debugging, do that work in a standard Arduino first, and then translate your debugged program to this device.

Is the IO 5V tolerant?

From the testing I have done on mine, the pins when being used as an input, are 3.3v tolerant.

The board can be connected to 5V power supply and simultaneously been conectes to the usb conector from my computer?

There would be a problem if the 5V supply was actually a lower voltage than the USB (which should be 5V). A diode protects everything if the external 5V supply was above 5V (up to the 6V limit of the voltage regulator on the board). To be safe, a diode should be added in series with the external 5V supply. This protection is present in genuine Arduino boards' VIN pin.

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🚀 Tiny Tech, Massive Potential: Power Your Next-Gen Projects with Seeed Studio XIAO!

PLUG PLAY USB C - Modern USB Type-C interface for effortless power delivery and code uploading—no adapters needed.
COMPACT POWERHOUSE - Smallest Arduino-compatible board with 14 multifunctional GPIO pins including analog, digital, PWM, DAC, I2C, UART & SPI.
WEARABLE READY DESIGN - Integrated power pads and ultra-low power consumption make it perfect for sleek wearable tech and compact prototypes.
ARDUINO IDE COMPATIBLE - Fully supported by Arduino IDE with extensive libraries, enabling rapid development and easy integration.
BLAZING FAST PROCESSING - ARM Cortex-M0+ 32bit CPU runs 3x faster than classic Arduino boards for seamless multitasking.

The Seeed Studio XIAO SAMD21 is the smallest Arduino-compatible microcontroller board featuring a 48MHz ARM Cortex-M0+ CPU, 256KB flash memory, and 32KB SRAM. Despite its ultra-compact 20x17.5mm size, it offers 14 versatile GPIO pins with analog, digital, PWM, DAC, I2C, UART, and SPI interfaces. Equipped with a USB Type-C port for power and programming, it’s optimized for wearable devices, rapid prototyping, and small-scale projects, all fully compatible with the Arduino IDE for seamless coding and development.

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Processor	48 MHz
RAM	LPDDR3
Wireless Type	Bluetooth
Brand	seeed studio
Series	Seeed Studio XIAO SAMD21
Item model number	102010328
Operating System	Windows, macOS, Linux
Item Weight	1.13 ounces
Product Dimensions	0.83 x 0.69 x 0.83 inches
Item Dimensions LxWxH	0.83 x 0.69 x 0.83 inches
Color	1pc
Number of Processors	1
Manufacturer	seeed studio
ASIN	B08CN5YSQF
Country of Origin	China
Date First Available	July 9, 2020

Seeed Studio XIAO SAMD21 - Smallest Arduino Compatible Microcontroller with Rich Interfaces, 1pc

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