I2C Serial Machine Interface

NEW! RS-232 / I²C-Adapter & Parallel I/O Module

• Ubicom SX I2C interfacing source code and samples
• Microchip PIC I2C and SPI source code and samples
• Using open drain or symetric pins when interfacing to IIC devices
• Interfacing 5 volt controllers to 3.3 volt slaves
• DDJ June 1992 PROGRAMMING THE 12C INTERFACE by Mitchell Kahn The I2C bus is a two-wire synchronous serial interface for intelligent IC devices. Source, Article

Busses@ EEPROMs@

The use and manufacturing of I2C devices is subject to a copyright and patents from philips. This means that if you , as a semiconductor manufacturer or system developer , need to purchase a licence from philips to use I2C technology in your system.

What this seems to mean in practices is that manufacturers call there I2C compatible parts "2 wire interface" chips, that just happen to be compatible with the I2C protocol, rather than pay phillips royalties for the right to actually SAY "I2C"...

I2C is very (VERY) simple.

See also:

• http://www.high-techgarage.com/tutorial/i2c.php Good background info and EEPROM interface code.+
• http://www.htsoft.com  PIC
• http://web.archive.org/web/20010624224643/www.embeddedstuff.com/1_05.htm U24C08 I2C EEPROM Chip Programming
• http://www-us2.semiconductors.philips.com/i2c/products/
• http://www.phanderson.com/PIC/PICC/CCS_PCM/24_256_1.html One of the better C versions (start at "common i2c routines") (cached 200207630120456)
• http://www.us-epanorama.net/project_interfacing.html I2C serial and parallel stuff.

Questions:

Comments:

• Please update the philips I2C page to: http://www.philips.com/i2c
  
  The original patent is now in the public domain. As always
  
  "Purchase of Philips I2C components conveys a license under the Philips I2C patent to use the components in the I2C system, provided the system conforms to the I2C specifications defined by Philips."+

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