SBW connector layout

[gordon 229]

Is there an established way of laying out the SBW connector? When you look at (say) an AVR board and see a characteristic group of 6 or 10 pins, you immediately know that's AVR-ISP.

 

Any such convention for SBW?

[Rickta59 589]

Seeing as SBW is really only 2 pins (TEST / RST ) I'm not sure if it worth the effort. That being said, on boards I've been building I'm using the FTDI cable pin outs as my standard so at least my serial ports are somewhat standard. With the launch pad I use jumper wires to get the RXD/TXD/VCC/GND. It lacks the RTS/CTS signals ( most software isn't using hardware flow control )

 

       JP1
      +---+
      | 1 | GND/BLACK
      | 2 | CTS/BROWN
      | 3 | VCC/RED ( 5v with FTDI cable 3.3 Launchpad )
      | 4 | TXD/ORANGE
      | 5 | RXD/YELLOW
      | 6 | RTS/GREEN
      +---+

 

If you use an FTDI cable be sure and put a 3.3 v regulator on the VCC so you don't fry your 430 chip.

Sparkfun sells those cables: http://www.sparkfun.com/products/9717

 

SFE also sells an FTDI breakout board that has the VCC set to 3.3v so you wouldn't need a regulator.

http://www.sparkfun.com/products/718

 

-rick

[zeke 693]

I believe that this is the defacto standard pinout:

 

• 1. Vcc
  2. TEST/SBWTCK
  3. RST/SBWTDIO
  4. Ground
  

 

What connector you implement it on is up to you.

[gordon 229]

For the record, SugarAddict dug up this. A bit wasteful on everything, but there is a standard .

[SugarAddict 227]

This is what TI follows on their devices:

 

For a host SBW it is

1. 
   [*:2o78w2yv]TXD
   [*:2o78w2yv]VCC
   [*:2o78w2yv]SBWTCK
   [*:2o78w2yv]SBWTDIO
   [*:2o78w2yv]GND
   [*:2o78w2yv]RXD

 

Page 9 http://focus.ti.com/lit/ug/slau176d/slau176d.pdf

 

And for a device it is

1. 
   [*:2o78w2yv]RXD
   [*:2o78w2yv]VCC
   [*:2o78w2yv]SBWTCK
   [*:2o78w2yv]SBWTDIO
   [*:2o78w2yv]GND
   [*:2o78w2yv]TXD

 

Page 18 http://focus.ti.com/lit/ug/slau227e/slau227e.pdf