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TDA7448 数据表(PDF) 6 Page - STMicroelectronics |
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TDA7448 数据表(HTML) 6 Page - STMicroelectronics |
6 / 14 page TDA7448 6/14 5 SOFTWARE SPECIFICATION Interface Protocol The interface protocol comprises: ■ A start condition (S) ■ A chip address byte, containing the TDA7448 address ■ 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 5.1 EXAMPLES 5.1.1 No Incremental Bus The TDA7448 receives a start condition, the correct chip address, a subaddress with the B = 0 (no incremental bus), N-data (all these data concern the subaddress selected), a stop condition. 5.1.2 Incremental Bus The TDA7448 receivea start conditions, the correct chip address, a subaddress with the B = 1 (incremental 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. 5.2 DATA BYTES Address= 88 (HEX) (10001000): ADDR open; 8A (HEX) (10001010): connect to supply Table 6. FUNCTION SELECTION: subaddress B=1: INCREMENTAL BUS; ACTIVE B=0: NO INCREMENTAL BUS X= DON’T CARE MSB LSB SUBADDRESS D7 D6 D5 D4 D3 D2 D1 D0 X X X B 0 0 0 0 SPEAKER ATTENUATION OUT 1 X X X B 0 0 0 1 SPEAKER ATTENUATION OUT 2 X X X B 0 0 1 0 SPEAKER ATTENUATION OUT 3 X X X B 0 0 1 1 SPEAKER ATTENUATION OUT 4 X X X B 0 1 0 0 SPEAKER ATTENUATION OUT 5 X X X B 0 1 0 1 SPEAKER ATTENUATION OUT 6 X X X B 01 10 NOT USED” X X X B 01 11 NOT USED 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 S 1 0 0 0 1 0 0 0 ACK ACK DATA ACK P MSB LSB MSB LSB MSB LSB CHIP ADDRESS D96AU422 X D3 SUBADDRESS DATA 1 to DATA n X X 1 D2 D1 D0 |
类似零件编号 - TDA7448 |
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类似说明 - TDA7448 |
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