2
\$\begingroup\$

I m newbie.I don't want to ruin my board.I searched and found crysal soldering to launchpad.But there is msp430 launchpad pins too.Can I solder pins directly or should I use male header or female header.I said that pins like 1.6 1.7..... Can i solder them directly

\$\endgroup\$
2
  • 1
    \$\begingroup\$ It's hard to understand the question you are trying to ask. Can you elaborate? \$\endgroup\$ – SingleNegationElimination Apr 9 '11 at 21:12
  • 3
    \$\begingroup\$ It's quite obvious to anyone with a Launchpad! \$\endgroup\$ – Leon Heller Apr 9 '11 at 22:23
11
\$\begingroup\$

The crystal should be close to the chip - use the pads provided.

For most applications a crystal isn't necessary as it's got a very stable on-chip oscillator.

\$\endgroup\$
1
  • 1
    \$\begingroup\$ +1 Long traces can easily ruin the oscillator, especially with a > 8MHz crystal. \$\endgroup\$ – jpc Apr 9 '11 at 21:25
1
\$\begingroup\$

The crystal location is placed there because it's a critical thing for a clock reference, as Leon said. Place the crystal at that location.

An alternative is, what I've seen very similar on some of the olimex microcontroller boards, is to use female pin headers at the location. You can slide a crystal in there and swap it with another one whenever necessary. However, this might not be the best and reliable connection, as it might not be a perfect fit (and make very poor contact).

Personally, if you want to use the board occasionally, take 1 crystal you think you'll use most often and place it right in there. I also believe the boards very sold for a very very low price, so you may as well get another one and place another crystal on there, if you're a bit anxious with desoldering and soldering.

\$\endgroup\$
3
  • \$\begingroup\$ It's a surface-mount crystal, headers can't be used. \$\endgroup\$ – Leon Heller Apr 10 '11 at 16:02
  • \$\begingroup\$ I really do see holes at the crystal symbol on this picture of the MSP430 launchpad: jp.rs-online.com/largeimages/R7122649-01.jpg However, I also see that XIN and XOUT are routed outwards to, possibly, a pinheader.. Odd. \$\endgroup\$ – Hans Apr 10 '11 at 16:30
  • \$\begingroup\$ You are right, I just checked one of my boards. They are brought out to pins as the same connections can be used for I/O, if the crystal isn't used. \$\endgroup\$ – Leon Heller Apr 10 '11 at 17:14

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy