I²C Protocol - Revision history

CityK: merged the content from the "I²C Protocol-V4L" article; for the relevant user contribution history see the archived "V4L:I²C Protocol-V4L" page

2008-11-05T00:01:11Z

merged the content from the "I²C Protocol-V4L" article; for the relevant user contribution history see the archived "V4L:I²C Protocol-V4L" page

← Older revision		Revision as of 00:01, 5 November 2008
Line 1:		Line 1:
-	The '''I<sup>2</sup>C''' Bus is often used on ~~[[DVB cards]]~~ in order to control ~~Tuner~~ ICs and [[Demodulator]]s, thus here a short overview:	+	The '''I<sup>2</sup>C''' Bus is often used on tv tuner devices in order to control tuner ICs and [[Demodulator]]s, thus here a short overview:

	The '''I<sup>2</sup>C Protocol''' was introduced by Philips as ''Inter-Integrated Circuit Protocol''. It's implemented as a 2-Wire Bus with one or more Masters and up to 127 clients. The two wire signals are called ''SDA'' (Serial Data) and ''SCL'' (Serial Clock). The bus is usually clocked at 100kHz or 400kHz, but slower variants exist as well as fast ones with more than 1MHz clock rate.		The '''I<sup>2</sup>C Protocol''' was introduced by Philips as ''Inter-Integrated Circuit Protocol''. It's implemented as a 2-Wire Bus with one or more Masters and up to 127 clients. The two wire signals are called ''SDA'' (Serial Data) and ''SCL'' (Serial Clock). The bus is usually clocked at 100kHz or 400kHz, but slower variants exist as well as fast ones with more than 1MHz clock rate.
Line 18:		Line 18:
	Alternative (incompatible) Inter-Circuit Interfaces are [[SPI]] (faster -- up to several MHz clock rate, but more than 3 signal wires), the simple 8-bit Parallel Microcontroller Bus (fast but more than 8 signals), the 1-wire bus (usually very slow).		Alternative (incompatible) Inter-Circuit Interfaces are [[SPI]] (faster -- up to several MHz clock rate, but more than 3 signal wires), the simple 8-bit Parallel Microcontroller Bus (fast but more than 8 signals), the 1-wire bus (usually very slow).

		+	Also used to
		+	* change the channel
		+	* control the monitor

	==External Links==		==External Links==
-		+	* [http://www.semiconductors.philips.com/buses/i2c/ Philips i2c Specification]
-	* [http://www.semiconductors.philips.com/buses/i2c/ Philips i2c ~~Spec~~]	+	* [http://en.wikipedia.org/wiki/I2C i2c Wikipedia article]
-		+	* [http://www.esacademy.com/faq/i2c/ Embedded Systems Academy's i2c tutorial] (which includes diagrams and a FAQ)
-	* [http://en.wikipedia.org/wiki/I2C i2c in Wikipedia]	+	* The Linux kernel documentation under ''linux''/Documentation/i2c/ is also worth a look.
-		+
-	* [http://www.esacademy.com/faq/i2c/~~] Excellent~~ i2c tutorial (~~including~~ diagrams), and FAQ.	+
-		+
-	* The Linux kernel documentation under linux/Documentation/i2c/ is also worth a look.	+

	[[Category:Technology]]		[[Category:Technology]]

CityK: I2c Protocol moved to I²C Protocol: name -- trying to get the "2" to become superscripted

2008-01-05T15:00:34Z

I2c Protocol moved to I²C Protocol: name -- trying to get the "2" to become superscripted

← Older revision

Revision as of 15:00, 5 January 2008

CityK: fixed links

2007-04-17T02:32:21Z

fixed links

← Older revision		Revision as of 02:32, 17 April 2007
Line 14:		Line 14:
	i2c is used mainly by European and Asian STB manufacturers as a communication protocol between the Main Processor, [[Demodulator]]s and Tuner [[PLL]]s.		i2c is used mainly by European and Asian STB manufacturers as a communication protocol between the Main Processor, [[Demodulator]]s and Tuner [[PLL]]s.

-	Since [[Philips ~~Semiconductor~~]] did not release the Protocol to the public, but tries to sell licenses there are some, mostly compatible, variations out there with slight modifications. They are usually called "2-wire Bus", "i2c-compatible Bus".	+	Since [[Philips Semiconductors]] did not release the Protocol to the public, but tries to sell licenses there are some, mostly compatible, variations out there with slight modifications. They are usually called "2-wire Bus", "i2c-compatible Bus".

	Alternative (incompatible) Inter-Circuit Interfaces are [[SPI]] (faster -- up to several MHz clock rate, but more than 3 signal wires), the simple 8-bit Parallel Microcontroller Bus (fast but more than 8 signals), the 1-wire bus (usually very slow).		Alternative (incompatible) Inter-Circuit Interfaces are [[SPI]] (faster -- up to several MHz clock rate, but more than 3 signal wires), the simple 8-bit Parallel Microcontroller Bus (fast but more than 8 signals), the 1-wire bus (usually very slow).

-	~~----~~	+
-	''Links~~:''~~	+	==External Links==

	* [http://www.semiconductors.philips.com/buses/i2c/ Philips i2c Spec]		* [http://www.semiconductors.philips.com/buses/i2c/ Philips i2c Spec]

CityK: fixed link

2007-04-16T00:02:22Z

fixed link

← Older revision		Revision as of 00:02, 16 April 2007
Line 1:		Line 1:
-	The '''I<sup>2</sup>C''' Bus is often used on [[DVB ~~Cards~~]] in order to control Tuner ICs and [[Demodulator]]s, thus here a short overview:	+	The '''I<sup>2</sup>C''' Bus is often used on [[DVB cards]] in order to control Tuner ICs and [[Demodulator]]s, thus here a short overview:

	The '''I<sup>2</sup>C Protocol''' was introduced by Philips as ''Inter-Integrated Circuit Protocol''. It's implemented as a 2-Wire Bus with one or more Masters and up to 127 clients. The two wire signals are called ''SDA'' (Serial Data) and ''SCL'' (Serial Clock). The bus is usually clocked at 100kHz or 400kHz, but slower variants exist as well as fast ones with more than 1MHz clock rate.		The '''I<sup>2</sup>C Protocol''' was introduced by Philips as ''Inter-Integrated Circuit Protocol''. It's implemented as a 2-Wire Bus with one or more Masters and up to 127 clients. The two wire signals are called ''SDA'' (Serial Data) and ''SCL'' (Serial Clock). The bus is usually clocked at 100kHz or 400kHz, but slower variants exist as well as fast ones with more than 1MHz clock rate.

Elronxenu: Improve grammar

2007-03-12T13:14:47Z

Improve grammar

← Older revision		Revision as of 13:14, 12 March 2007
Line 1:		Line 1:
	The '''I<sup>2</sup>C''' Bus is often used on [[DVB Cards]] in order to control Tuner ICs and [[Demodulator]]s, thus here a short overview:		The '''I<sup>2</sup>C''' Bus is often used on [[DVB Cards]] in order to control Tuner ICs and [[Demodulator]]s, thus here a short overview:

-	The '''I<sup>2</sup>C Protocol''' was introduced by Philips as ''Inter-Integrated Circuit Protocol''. It's implemented as ~~trivial~~ 2-Wire Bus with one or more Masters and up to 127 clients. The two wire signals are called ''SDA'' (Serial Data) and ''SCL'' (Serial Clock). The bus is usually clocked at 100kHz or 400kHz, but slower variants exist as well as fast ones with more than 1MHz clock rate.	+	The '''I<sup>2</sup>C Protocol''' was introduced by Philips as ''Inter-Integrated Circuit Protocol''. It's implemented as a 2-Wire Bus with one or more Masters and up to 127 clients. The two wire signals are called ''SDA'' (Serial Data) and ''SCL'' (Serial Clock). The bus is usually clocked at 100kHz or 400kHz, but slower variants exist as well as fast ones with more than 1MHz clock rate.

-	Every '''I<sup>2</sup>C''' message consists of an address byte (7 bit address, 1 bit R/W#) and an arbitrary number of data bytes. The master starts transmission by issuing a ''START'' condition, then submitting the address byte to the bus. If any client with this '''I<sup>2</sup>C''' address is listening on the bus he acknowledges this address by pulling the ''SDA'' wire low for one clock cycle.	+	Every '''I<sup>2</sup>C''' message consists of an address byte (7 bit address, 1 bit R/W#) and an arbitrary number of data bytes. The master starts transmission by issuing a ''START'' condition, then submitting the address byte to the bus. If any client with this '''I<sup>2</sup>C''' address is listening on the bus it acknowledges this address by pulling the ''SDA'' wire low for one clock cycle.

	For Write Transfers the master sends all following bytes to the bus and the client acknowledges each byte.		For Write Transfers the master sends all following bytes to the bus and the client acknowledges each byte.

-	Read Transfers ~~get~~ acknowledged by the Master except the last byte (which does not ~~gets~~ acknowledged in order to signal the end of transmission).	+	Read Transfers are acknowledged by the Master except the last byte (which does not get acknowledged in order to signal the end of transmission).

	''It would be nice to have some pictures visualizing the protocol. Any contributors?''		''It would be nice to have some pictures visualizing the protocol. Any contributors?''
	''-- There are some nice diagrams and descriptions of i2c in the BT8x8 and CX2388X datasheets (which Google will usually turn up)''		''-- There are some nice diagrams and descriptions of i2c in the BT8x8 and CX2388X datasheets (which Google will usually turn up)''

-	i2c is used mainly by European and Asian STB manufacturers as communication protocol between the Main Processor, [[Demodulator]]s and Tuner [[PLL]]s.	+	i2c is used mainly by European and Asian STB manufacturers as a communication protocol between the Main Processor, [[Demodulator]]s and Tuner [[PLL]]s.

-	Since [[Philips Semiconductor]] did not ~~released~~ the Protocol to the public, but tries to sell licenses there are some, mostly compatible, variations out there with slight modifications. They are usually called "2-wire Bus", "i2c-compatible Bus".	+	Since [[Philips Semiconductor]] did not release the Protocol to the public, but tries to sell licenses there are some, mostly compatible, variations out there with slight modifications. They are usually called "2-wire Bus", "i2c-compatible Bus".

	Alternative (incompatible) Inter-Circuit Interfaces are [[SPI]] (faster -- up to several MHz clock rate, but more than 3 signal wires), the simple 8-bit Parallel Microcontroller Bus (fast but more than 8 signals), the 1-wire bus (usually very slow).		Alternative (incompatible) Inter-Circuit Interfaces are [[SPI]] (faster -- up to several MHz clock rate, but more than 3 signal wires), the simple 8-bit Parallel Microcontroller Bus (fast but more than 8 signals), the 1-wire bus (usually very slow).

TimSmall at 16:44, 6 March 2006

2006-03-06T16:44:04Z

← Older revision		Revision as of 16:44, 6 March 2006
Line 25:		Line 25:
	* [http://en.wikipedia.org/wiki/I2C i2c in Wikipedia]		* [http://en.wikipedia.org/wiki/I2C i2c in Wikipedia]

		+	* [http://www.esacademy.com/faq/i2c/] Excellent i2c tutorial (including diagrams), and FAQ.
		+
		+	* The Linux kernel documentation under linux/Documentation/i2c/ is also worth a look.

	[[Category:Technology]]		[[Category:Technology]]

Guidod: +cat

2005-04-02T22:37:17Z

+cat

← Older revision		Revision as of 22:37, 2 April 2005
Line 24:		Line 24:

	* [http://en.wikipedia.org/wiki/I2C i2c in Wikipedia]		* [http://en.wikipedia.org/wiki/I2C i2c in Wikipedia]
		+
		+
		+	[[Category:Technology]]

Holger at 15:35, 27 September 2004

2004-09-27T15:35:42Z

← Older revision		Revision as of 15:35, 27 September 2004
Line 14:		Line 14:
	i2c is used mainly by European and Asian STB manufacturers as communication protocol between the Main Processor, [[Demodulator]]s and Tuner [[PLL]]s.		i2c is used mainly by European and Asian STB manufacturers as communication protocol between the Main Processor, [[Demodulator]]s and Tuner [[PLL]]s.

-	Since [[Philips Semiconductor]] did not released the Protocol to the public but tries to sell licenses there are some, mostly compatible, variations out there with slight modifications. They are usually called "2-wire Bus", "i2c-compatible Bus" ~~or similar that try to avoid the license fees~~.	+	Since [[Philips Semiconductor]] did not released the Protocol to the public, but tries to sell licenses there are some, mostly compatible, variations out there with slight modifications. They are usually called "2-wire Bus", "i2c-compatible Bus".

-	Alternative (incompatible) Inter-Circuit Interfaces are [[SPI]] (~~fast~~ -- up to several MHz clock rate, but more than 3 signal wires), the simple 8-bit Parallel Microcontroller Bus (fast but more than 8 signals), the 1-wire bus (usually very slow).	+	Alternative (incompatible) Inter-Circuit Interfaces are [[SPI]] (faster -- up to several MHz clock rate, but more than 3 signal wires), the simple 8-bit Parallel Microcontroller Bus (fast but more than 8 signals), the 1-wire bus (usually very slow).

	----		----

Holger at 14:17, 23 September 2004

2004-09-23T14:17:37Z

← Older revision		Revision as of 14:17, 23 September 2004
Line 1:		Line 1:
-	The ~~i2c~~ Bus is often used on [[DVB Cards]] in order to control Tuner ICs and [[Demodulator]]s, thus here a short overview:	+	The '''I<sup>2</sup>C''' Bus is often used on [[DVB Cards]] in order to control Tuner ICs and [[Demodulator]]s, thus here a short overview:

-	The ~~i2c~~ Protocol was introduced by Philips as ''Inter-Integrated Circuit Protocol''. It's implemented as trivial 2-Wire Bus with one or more Masters and up to 127 clients. The two wire signals are called ''SDA'' (Serial Data) and ''SCL'' (Serial Clock). The bus is usually clocked at 100kHz or 400kHz, but slower variants exist as well as fast ones with more than 1MHz clock rate.	+	The '''I<sup>2</sup>C Protocol''' was introduced by Philips as ''Inter-Integrated Circuit Protocol''. It's implemented as trivial 2-Wire Bus with one or more Masters and up to 127 clients. The two wire signals are called ''SDA'' (Serial Data) and ''SCL'' (Serial Clock). The bus is usually clocked at 100kHz or 400kHz, but slower variants exist as well as fast ones with more than 1MHz clock rate.

-	Every ~~i2c~~ message consists of an address byte (7 bit address, 1 bit R/W#) and an arbitrary number of data bytes. The master starts transmission by issuing a ''START'' condition, then submitting the address byte to the bus. If any client with this ~~i2c~~ address is listening on the bus he acknowledges this address by pulling the ''SDA'' wire low for one clock cycle.	+	Every '''I<sup>2</sup>C''' message consists of an address byte (7 bit address, 1 bit R/W#) and an arbitrary number of data bytes. The master starts transmission by issuing a ''START'' condition, then submitting the address byte to the bus. If any client with this '''I<sup>2</sup>C''' address is listening on the bus he acknowledges this address by pulling the ''SDA'' wire low for one clock cycle.

	For Write Transfers the master sends all following bytes to the bus and the client acknowledges each byte.		For Write Transfers the master sends all following bytes to the bus and the client acknowledges each byte.
Line 9:		Line 9:
	Read Transfers get acknowledged by the Master except the last byte (which does not gets acknowledged in order to signal the end of transmission).		Read Transfers get acknowledged by the Master except the last byte (which does not gets acknowledged in order to signal the end of transmission).

-	''~~Please add a link to the Philips i2c spec here and it~~ would be nice to have some pictures visualizing the protocol. Any contributors?''	+	''It would be nice to have some pictures visualizing the protocol. Any contributors?''
	''-- There are some nice diagrams and descriptions of i2c in the BT8x8 and CX2388X datasheets (which Google will usually turn up)''		''-- There are some nice diagrams and descriptions of i2c in the BT8x8 and CX2388X datasheets (which Google will usually turn up)''

Line 17:		Line 17:

	Alternative (incompatible) Inter-Circuit Interfaces are [[SPI]] (fast -- up to several MHz clock rate, but more than 3 signal wires), the simple 8-bit Parallel Microcontroller Bus (fast but more than 8 signals), the 1-wire bus (usually very slow).		Alternative (incompatible) Inter-Circuit Interfaces are [[SPI]] (fast -- up to several MHz clock rate, but more than 3 signal wires), the simple 8-bit Parallel Microcontroller Bus (fast but more than 8 signals), the 1-wire bus (usually very slow).
		+
		+	----
		+	''Links:''
		+
		+	* [http://www.semiconductors.philips.com/buses/i2c/ Philips i2c Spec]
		+
		+	* [http://en.wikipedia.org/wiki/I2C i2c in Wikipedia]

FyKnight at 12:10, 21 September 2004

2004-09-21T12:10:50Z

← Older revision		Revision as of 12:10, 21 September 2004
Line 10:		Line 10:

	''Please add a link to the Philips i2c spec here and it would be nice to have some pictures visualizing the protocol. Any contributors?''		''Please add a link to the Philips i2c spec here and it would be nice to have some pictures visualizing the protocol. Any contributors?''
-		+	''-- There are some nice diagrams and descriptions of i2c in the BT8x8 and CX2388X datasheets (which Google will usually turn up)''

	i2c is used mainly by European and Asian STB manufacturers as communication protocol between the Main Processor, [[Demodulator]]s and Tuner [[PLL]]s.		i2c is used mainly by European and Asian STB manufacturers as communication protocol between the Main Processor, [[Demodulator]]s and Tuner [[PLL]]s.