Question 1

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?

Accepted Answer

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."

Question 2

Does this come with a bootloader or not?

Accepted Answer

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.

Question 3

Is the IO 5V tolerant?

Accepted Answer

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

Question 4

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

Accepted Answer

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.

ASIN	B0B15B869W
Best Sellers Rank	#267 in Single Board Computers (Computers & Accessories)
Brand	seeed studio
Built-In Media	/
CPU Model	core_m
CPU Speed	48 MHz
Compatible Devices	Arduino IDE compatible devices
Connectivity Technology	GPIO, I2C, USB
Customer Reviews	4.5 out of 5 stars 762 Reviews
Item Dimensions L x W x H	0.69"W x 0.69"H
Manufacturer	seeed studio
Memory Storage Capacity	256 KB
Model Name	XIAO SAMD21
Operating System	Arduino
Processor Brand	ARM
Processor Count	1
Processor Speed	48 MHz
RAM Memory Installed	32 GB
RAM Memory Technology	SRAM
Ram Memory Installed Size	32 GB
Smart Home Compatibility	Not Smart Home Compatible
Total Usb Ports	1
Unit Count	1.0 Count
Warranty Description	/
Wireless Compability	802.11b

Seeed Studio XIAO SAMD21 (Pre-Soldered) The Smallest Arduino Microcontroller Based on SAMD21 with Rich Interfaces, 100% Arduino IDE Compatible, desiged for Projects Need Arduino Micro, 1pc.

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