Pages: [1]   Go Down
Author Topic: Connections for bootloading a nano based board  (Read 525 times)
0 Members and 1 Guest are viewing this topic.
Offline Offline
Full Member
***
Karma: 2
Posts: 106
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I am laying out a pcb based on a Arduino Nano, so it has SMT Atmega328 and the FT323RL. I am a little confused as to what connections I need for bootloading the chips as they will be blank obviously.
Can they be bootloaded through the USB port or do I Have to have access to MOSI, MISO and SCK just for bootloading?
Logged

Global Moderator
Boston area, metrowest
Offline Offline
Brattain Member
*****
Karma: 533
Posts: 26934
Author of "Arduino for Teens". Available for Design & Build services. Now with Unlimited Eagle board sizes!
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Need SCK, MISO, MOSI, Reset, Power, Gnd for bootloading. Not USB port.
Logged

Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

London
Offline Offline
Full Member
***
Karma: 0
Posts: 146
Ugi was not declared in this scope
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Obviously, all of those pins except for reset are used for other functions so you would most likely have access to them anyway.  It's convenient that they are brought together in the six-pin connector but it's not essential.  You just need some sort of header on each of those pins that you can connect to.  Reset also.

If you are laying out a PCB with permanent connections to some pins, bear in mind that low-impedance loads on the pins for MISO, MOSI, or SCK can prevent communication through these pins for burning the bootloader.
Logged

Pages: [1]   Go Up
Jump to: