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TDA7313N Datasheet(PDF) 8 Page - STMicroelectronics |
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TDA7313N Datasheet(HTML) 8 Page - STMicroelectronics |
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8 / 14 page  I 2C BUS INTERFACE Data transmission from microprocessor to the TDA7313N and viceversa takes place thru the 2 wires I 2C BUS interface, consisting of the two lines SDA and SCL (pull-up resistors to positive supply voltage must be connected). Data Validity As shown in fig. 17, the data on the SDA line must be stable during the high period of the clock. The HIGH and LOW state of the data line can only change when the clock signal on the SCL line is LOW. Start and Stop Conditions As shown in fig.18 a start condition is a HIGH to LOW transition of the SDA line while SCL is HIGH. The stop condition is a LOW to HIGH tran- sition of the SDA line while SCL is HIGH. Byte Format Every byte transferred on the SDA line must con- tain 8 bits. Each byte must be followed by an ac- knowledge bit. The MSB is transferred first. Acknowledge The master ( µP) puts a resistive HIGH level on the SDA line during the acknowledge clock pulse (see fig. 19). The peripheral (audioprocessor) that ac- knowledges has to pull-down (LOW) the SDA line during the acknowledge clock pulse, so that the SDA line is stable LOW during this clock pulse. The audioprocessor which has been addressed has to generate an acknowledge after the recep- tion of each byte, otherwise the SDA line remains at the HIGH level during the ninth clock pulse time. In this case the master transmitter can gen- erate the STOP information in order to abort the transfer. Transmission without Acknowledge Avoiding to detect the acknowledge of the audio- processor, the µP can use a simplier transmis- sion: simply it waits one clock without checking the slave acknowledging, and sends the new data. This approach of course is less protected from misworking and decreases the noise immunity. Figure 17: Data Validity on the I 2CBUS Figure 16: Typical Tone Response (with the ext. components indicated in the test circuit) Figure 15: Bass Resistance vs. Temperature TDA7313N 8/14 |
Similar Part No. - TDA7313N |
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Similar Description - TDA7313N |
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