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12vDay-Night Switch
1 GLOLAB Universal Telephone Hold UNIVERSAL HOLD CIRCUIT If you have touch tone telephone service, you can now put a call on hold from any phone in the house, [. . ]
http://discovercircuits.com/PDF-FILES/12vDay-Night Switch.pdf
AN10216
INTEGRATED CIRCUITS AN10216-01 I2C Manual APPLICATION NOTE AN10216-01 I2C MANUAL Abstract  The I2C Manual provides a broad overview of the various serial buses, why the I2C bus should be considered, technical detail of the I2C [. . ]
http://www.nxp.com/documents/application_note/AN10216.pdf
hold
1 GLOLAB Universal Telephone Hold UNIVERSAL HOLD CIRCUIT If you have touch tone telephone service, you can now put a call on hold from any phone in the house, [. . ]
http://www.glolab.com/freeinfo/hold.pdf
da7218_pb_163008
DA7218 DA7218 is a high-performance, low-power audio codec optimized for use in portable applications or wearable devices. It has single-ended headphone outputs with headphone detect for use in accessories, offering excellent left to right channel separation and common mode noise rejection. DA7218.......
https://www.dialog-semiconductor.com/sites/default/files/da7218_pb_163008.pdf
Blackfin_Processor_Family_(I)
Blackfin Processor Family Why Choose a Blackfin Processor? · Highperformance, 16-/32-bitBlackfin®processorcorewithDSPandRISC functionalityandprogrammability · Eliminatesneedformultipleseparateprocessors · Largeportfolioofproductsrangingfrom300MHzto600MHz · Best-in-classMHz/mWperforman.......
https://www.analog.com/static/imported-files/product_highlights/Blackfin_Processor_Family_(I).pdf