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TDA7348D013TR Datasheet(PDF) 10 Page - STMicroelectronics |
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TDA7348D013TR Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 20 page I2C BUS interface TDA7348 10/20 3 I2C BUS interface Data transmission from microprocessor to the TDA7348 and vice-versa takes place through the 2 wires of the I2C BUS interface, consisting of the two lines SDA and SCL (pull-up resistors to the positive supply voltage must be externally connected). 3.1 Data validity As shown in Figure 3., 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. 3.2 Start and stop conditions As shown in Figure 4. 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 transition of the SDA line while SCL is HIGH. A STOP conditions must be sent before each START condition. 3.3 Byte format Every byte transferred to the SDA line must contain 8 bits. Each byte must be followed by an acknowledge bit. The MSB is transferred first. 3.4 Acknowledge The master (microprocessor) puts a resistive HIGH level on the SDA line during the acknowledge clock pulse (see Figure 5.). The peripheral (audioprocessor) that acknowledges 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 reception 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 generate the STOP information in order to abort the transfer. 3.5 Transmission without acknowledgement The microprocessor can use a simpler transmission, if it avoids detection of the acknowledgement from the audio processor. It simply waits one clock pulse without checking the slave acknowledgment, and sends the new data. This approach of course is less protected from errors, increases the possibility of interference, and decreases the immunity to noise. |
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