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7430 Datasheet(PDF) 10 Page - STMicroelectronics |
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7430 Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 21 page SOFTWARE SPECIFICATION Interface Protocol The interface protocol comprises: A start condition (S) A chip address byte, containing the TDA7430 /TDA7431 address A subaddress bytes A sequence of data (N byte + achnowledge) A stop condition (P) ACK = Achnowledge S = Start P = Stop A = Address B = Auto Increment S 100000 A 0 ACK ACK DATA ACK P MSB LSB MSB LSB MSB LSB CHIP ADDRESS D95AU226A B DATA SUBADDRESS DATA 1 to DATA n EXAMPLES No Incremental Bus The TDA7430 /TDA7431 receives a start condi- tion, the correct chip address, a subaddress with the MSB = 0 (no incremental bus), N-datas (all these datas concern the subaddress selected), a stop condition. S 100000 A 0 ACK ACK DATA ACK P MSB LSB MSB LSB MSB LSB CHIP ADDRESS D95AU306 0D3 SUBADDRESS DATA X X X D2 D1 D0 Incremental Bus The TDA7430 /TDA7431 receive s a start condi- tion, the correct chip address, a subaddress with the MSB = 1 (incremental bus): now it is in a loop condition with an autoincrease of the subaddress whereas SUBADDRESS from ”1XXX1010” to ”1XXX1111” of DATA are ignored. The DATA 1 concern thesubaddress sent, and the DATA 2 concern the subaddress sent plus one in the loop etc, and at the end it receivers the stop condition. S 100000 A 0 ACK ACK DATA ACK P MSB LSB MSB LSB MSB LSB CHIP ADDRESS D95AU307 1D3 SUBADDRESS DATA 1 to DATA n X X X D2 D1 D0 TDA7430 - TDA7431 10/21 |
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