I2C
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(I2C testpoint photo) |
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| [[LM4857]] || 1111 100x | | [[LM4857]] || 1111 100x | ||
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+ | == I2C Testpoints == | ||
+ | From: Andy Green <andy@openmoko.com> | ||
+ | To: openmoko-devel <openmoko-devel@lists.openmoko.org> | ||
+ | Date: Wed, 02 Jul 2008 09:11:03 +0100 | ||
+ | |||
+ | If you pop the top facia, I2C is available from two testpoints near the | ||
+ | debug connector. GND is not on a testpoint there but the mounting holes at | ||
+ | the bottom and you can grab it from a capacitor under the battery on the | ||
+ | right of the picture too. | ||
+ | |||
+ | [[Image:I2C-testpoints.png|320px]] | ||
Revision as of 21:26, 2 July 2008
The I2C is a simple communication standard intended to move small amounts of data a few inches between chips. Please See I2C Wikipedia page for additional information.
I2C addresses
Note that I2C addresses are 7 bit. The last bit, which is not part of the address, indicates whether this is a read or write operation. So "0001 000x" is 0x8, not 0x10.
Neo1973
On the Neo1973, we currently use the following addresses on the I2C bus:
Device | I2C address |
PCF50606 | 0001 000x |
WM8753L | 0011 010x |
LM4857 | 1111 100x |
I2C Testpoints
From: Andy Green <andy@openmoko.com> To: openmoko-devel <openmoko-devel@lists.openmoko.org> Date: Wed, 02 Jul 2008 09:11:03 +0100
If you pop the top facia, I2C is available from two testpoints near the debug connector. GND is not on a testpoint there but the mounting holes at the bottom and you can grab it from a capacitor under the battery on the right of the picture too.
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