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interfacing mobile-phone to avr
Or you can wander over to atmel.com and read this ap.note:
AVR323: Interfacing GSM modems (21 pages, revision A, updated 02/06)
Link to ap.notes:
http://www.atmel.com/dyn/products/app_notes.asp?family_id=607
Olds69
Re: sigma delta design
I would personally recommend these books:
Delta-Sigma Data Converters.
Theory, design and Simulation
By S.R. Norsworthy, R. Schreier and G.C. Themes.
Or:
Understanding Delta-Sigma Data Converters
By R. Schreier and G.C Themes
I learned a lot from these and would...
Delta Sigmas are sometimes used in Li-ion battery charging/protecting circuits.
Try searching for Sigma Delta and Battery sensing/charging/monitoring.
If you have access to IEEE I know that this will produce a few relevant results.
olds69
SPI stands for Serial Peripheral Interface Bus and is an Motorola developed standard for synchronous data transfer.
More info on wikipedia:
https://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus
olds69
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