Pages: [1]   Go Down
Author Topic: RFM12B and vRestrict  (Read 328 times)
0 Members and 1 Guest are viewing this topic.
Monterey CA
Offline Offline
Sr. Member
****
Karma: 1
Posts: 323
Addicted to Arduino
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Hi, I am designing a small Arduino based micro with the RFM12B radio. The eagle footprints I find all have a vRestrict area underneath a good portion of the radio. Can I remove that or is that really needed? I really need the space for routing since I am trying to fit everything in a 30x30mm square.

The only way I was able to get the footprint was from opening another design that had it. Which most came from Jeenode.

Thanks.
-William
Logged

Current Projects:                    Arduinos:
Security Robot Tank               Uno
Security Robot II 4WD            Mega2560

http://mobilewill.blogspot.com

0
Offline Offline
Shannon Member
****
Karma: 200
Posts: 11694
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

It'll be there for two reasons probably:

1) To keep RF signals from coupling to your board - actually this should only matter near the antenna pin.

2) to prevent the traces on the bottom of the RFM12B module from shorting (or running too close to) the
  traces on the PCB - there is no gap between the boards when its surface mounted so capacitive coupling
  could be an issue.
Logged

[ I won't respond to messages, use the forum please ]

Monterey CA
Offline Offline
Sr. Member
****
Karma: 1
Posts: 323
Addicted to Arduino
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Thanks, makes sense. Hmm, I am going to try hand routing but I think I am asking too much for such a small space. I have a Atmega328p, FTDI connection SMD, MCP1702 SOT89 regulator and 0805 caps, some headers with ICSP, with the RFM12B on the back.

Logged

Current Projects:                    Arduinos:
Security Robot Tank               Uno
Security Robot II 4WD            Mega2560

http://mobilewill.blogspot.com

Pages: [1]   Go Up
Jump to: