bc10/serial interface (breakout board)

bc10

• Contents
  • Serial
    • Design
    • Assembly
    • How to Use
    • Memo
  • Revision History

Serial †

This is the information of how to apply the 30-pin breakout to the 30-pin connector, which is located at the lower part
of bc10.

Design †

• Schematic and Gerber data

  	OrCAD format	pdf format
  Schematic	bc10-009-0001.dsn	bc10-009-0001.pdf
  Gerber	bc10-009-0001.zip	bc10-009-0001_brd.pdf

Assembly †

• Parts-list

  	Product Name	Maker	Product Serial Number	Quantity	Memo
  1	RS232C Line Driver IC	MAXIM	MAX3232	1	There are a lot of clones. Please select for a 3.3V Line Drive IC. 5V one is not acceptable
  2	Multilayer Ceramic Capacitor	Murata Manufacturing	0.1μF	5	it can be replaced with any 0.1μF ceramic capacitors
  3	DSub 9-pin connector (female)			1	http://akizukidenshi.com/catalog/g/gC-00645/ and others (The information at the link site is in Japanese)
  4	Pin Header			1	Pin Header in 2.54mm Pitch. This is needed for 30 pins.
  5	30-pin connector for iPod			1	This is available at here. The product information is written in Japanese. Please use the picture of the product as a reference
  5	Small Signal Connector Housing			1	4x2 total 8 pins
  6	Small Signal Contact			4
  7	Signal Cable			20~30 cm approx.	4 wires

  •Many manufactures produce the compatible products and/or clones of RS232C Line Driver IC “MAX3232”. These
  products can substitute the original. Be careful, 3.3V products can be used here. Some of clones are 5V, and the
  5V clones cannot be applicable here.
  

• How to Make

  1. MAX3232 is placed on the breakout. The square-land (U1) indicates the location, where the first pin of IC
  is placed.
  
  
  2. Five Multilayer Ceramic Capacitors are put into the breakout.
  At each location, there are one square-land and two round-lands, and it requires only one square-land and one
  round-land. A round-land can be selected depending on a shape of capacitor. If use a 2.5mm-multilayer ceramic
  capacitor, choose the round-land next to the square-land. As using a 5 mm-capacitor, skip one round-land and
  apply the far side round-one. This makes ceramic capacitors apply to the breakout effortlessly and smoothly.
  
  
  3. Apply DSub 9-pin connector.
  
  4 Place 30 pin headers. Remove the 17th-pin. (Please see the picture 4)
  
  This is the end of working on the breakout.
  
  5 Make a cable. Connect a four-wire cable to 30-pin iPod connector. Use only four terminals of 30-pin iPod
  Connector. #11, #12, #13, and #18 terminals are connected to black, white, green, red cables, respectively.
  

  terminal	Wire Color
  11	black
  12	white
  13	green
  18	red

  
  
  6. On the other side of cable, small signal contacts are attached.
  
  
  7.The small signal contacts are inserted into the small signal connector housing. The wires, which are connected
  to #11, #12, #13, and #18 of 30-pin iPod connector, are linked to #1, #2, #3, #8 of terminals of the small signal
  connector housing, correspondingly.
  
  The small signal connector housing is 4x2 and has 8 terminals. These terminals are connected to #11, #12, #13,
  and #18 pins of pin headers on the breakout, respectively. If the wires are too thin, the small signal contacts
  could not hold wires well. Please change the wires more thicker than the the originals.
  
  

How to Use †

• Connect the cable created above to the 30-pin connector at bc10. The 30-pin iPod connector is attached to the 30-pin
  connector of bc10.
• Connect the small signal connector (4x2, 8 terminals) to #11~18 pins of the pin header on the breakout. To turn the black
  wire (#1, connected to #11 pin) toward #1 pin side, make sure that red wire (#3, connected to #12 pin) is put next to the
  black one.
• Attach a relay cable at the side of Connect Dsub 9-pin. Connect the cable to RS232C. At the other side, connect to a serial port
  of a PC.

Memo †

• This example uses only the serial console communication function of this breakout. This breakout is capable of handling other signals and
  can be equipped with other functions.
  • USER button
  • RESET button
  • Power supply switch
  • Stereo Audio input/output
  • Video/S-Video output

Revision History †

• 2010/11/10 This article is initially uploaded.
• 2010/11/12 Add more pictures.