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TDA7438D Datasheet(PDF) 9 Page - STMicroelectronics |
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TDA7438D Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 19 page 9/19 TDA7438 Figure 15. Acknowledge on the I2CBUS 5 SOFTWARE SPECIFICATION Interface Protocol The interface protocol comprises: ■ A start condition (S) ■ A chip address byte, containing the TDA7438 address ■ A subaddress bytes ■ A sequence of data (N byte + acknowledge) Figure 16. ACK = Acknowledge S = Start P = Stop A = Address B = Auto Increment 5.1 EXAMPLES 5.1.1 No Incremental Bus The TDA7438 receives a start condition, the correct chip address, a subaddress with the B = 0 (no incre- mental bus), N-data (all these data concern the subaddress selected), a stop condition. Figure 17. 5.1.2 Incremental Bus The TDA7438 receive a start conditions, the correct chip address, a subaddress with the B = 1 (incremen- tal bus): now it is in a loop condition with an autoincrease of the subaddress whereas SUBADDRESS from "XXX1000" to "XXX1111" of DATA are ignored.The DATA 1 concern the subaddress sent, and the DATA 2 concern the subaddress sent plus one in the loop etc, and at the end it receivers the stop condition SCL 1 MSB 23789 SDA START ACKNOWLEDGMENT FROM RECEIVER D99AU1033 S 1 0 0 0 1 0 0 0 ACK ACK DATA ACK P MSB LSB MSB LSB MSB LSB CHIP ADDRESS D96AU420 X DATA SUBADDRESS DATA 1 to DATA n X X B S 1 0 0 0 1 0 0 0 ACK ACK DATA ACK P MSB LSB MSB LSB MSB LSB CHIP ADDRESS D96AU421 X D3 SUBADDRESS DATA X X 0 D2 D1 D0 |
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