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TDA7345 Scheda tecnica(PDF) 8 Page - STMicroelectronics |
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TDA7345 Scheda tecnica(HTML) 8 Page - STMicroelectronics |
8 / 18 page INTERFACE FEATURES - Due to the fact that the MSB is used to select if the byte transmitted is a subaddress (func- tion) or a data (value), between a start and stop condition, is possible to receive, how many subaddresses and datas as wanted. - The subaddress (function) is fixed until a new subaddress is transmitted, so the TDA7345 can receive how many data as wanted for the selected subaddress (without the need for a new start condition) - If TDA7345 receives a subaddress with the LSB = 1 the incremental bus is selected, so it enters in a loop condition that means that every acknowledge will increase automat- ically the subaddress (function) and it re- ceives the data related to the new subad- dress. EXAMPLES 1) NO INCREMENTAL BUS TDA7345 receives a start condition, the correct chip address, a subaddress with the LSB = 0 (no incremental bus), N-datas (all these datas con- cern the subaddress selected), a new subad- dress, N-data, a stop condition. So it can receive in a single transmission how many subaddress are necessary, and for each subaddress how many data are necessary. 2) INCREMENTAL BUS TDA7345 receives a start condition, the correct chip address a subaddress with the LSB = 1 (in- cremental bus): now it is in a loop condition with an autoincrease of the subaddress. The first data that it receives doesn’t concern the subaddress sended but the next one, the second one concerns the subaddress sended plus two in the loop etc, and at the end it receives the stop condition. In the pictures there are some examples: S = start ACK = acknowledge B = 1 incremental bus, B = 0 no incremental bus P = stop SOFTWARE SPECIFICATION Interface Protocol The interface protocol comprises: A start condition (s) A chip address byte, containing the TDA7345 address (the 8th bit of the byte must be 0). The TDA7345 must always acknowledge at the end of each transmitted byte. A subaddress (function) bytes (identified by the MSB = 0) A sequence of dates and subaddresses (N bytes + achnowledge. The dates are identified by MSB = 1, subaddresses by MSB = 0) A stop condition (P) S 10000010 ACK A2 ACK DATA ACK P MSB LSB MSB LSB MSB LSB CHIP ADDRESS D94AU195 0A0 A1 A3 X X 0 1 SUBADDRESS DATA 1 ... DATA n 1) one subaddress, with n data concerning that subaddress (no incremental bus) ACK = Achnowledge S = Start P = Stop S 10000010 ACK DATA ACK DATA ACK S MSB LSB MSB LSB MSB LSB Data Transferred (N-bytes + Acknowledge) TDA7345 ADDRESS D94AU194 TDA7345 8/18 |
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