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7442 Datasheet(PDF) 7 Page - STMicroelectronics |
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7442 Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 17 page 7/17 TDA7442 - TDA7442D 4 SOFTWARE SPECIFICATION Interface Protocol The interface protocol comprises: ■ A start condition (S) ■ A chip address byte, containing the TDA7442D ■ A subaddress bytes ■ A sequence of data (N byte + acknowledge) ■ A stop condition (P) ACK = Acknowledge S = Start P = Stop A = Address B = Auto Increment 4.1 EXAMPLES 4.1.1 No Incremental Bus The TDA7442D receives a start condition, the correct chip address, a subaddress with the MSB = 0 (no incremental bus), N-datas (all these data concern the subaddress selected), a stop condition. 4.1.2 Incremental Bus The TDA7442D receive a start conditions, the correct chip address, a subaddress with the MSB = 1 (in- cremental bus): now it is in a loop condition with an autoincrease of the subaddress whereas SUBAD- DRESS from "1XXX1010" to "1XXX1111" of DATA are ignored. The DATA 1 concern the subaddress sent, and the DATA 2 concerns the subaddress sent plus one sent in the loop etc, and at the end it receivers the stop condition. S 1 0 0 0 0 0 A 0 ACK ACK DATA ACK P MSB LSB MSB LSB MSB LSB CHIP ADDRESS D95AU226A B DATA SUBADDRESS DATA 1 to DATA n S 1 0 0 0 0 0 A 0 ACK ACK DATA ACK P MSB LSB MSB LSB MSB LSB CHIP ADDRESS D95AU306 0 D3 SUBADDRESS DATA X X X D2 D1 D0 S 1 0 0 0 0 0 A 0 ACK ACK DATA ACK P MSB LSB MSB LSB MSB LSB CHIP ADDRESS D95AU307 1 D3 SUBADDRESS DATA 1 to DATA n X X X D2 D1 D0 |
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