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TLV320AIC12 Datasheet(PDF) 22 Page - Texas Instruments |
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TLV320AIC12 Datasheet(HTML) 22 Page - Texas Instruments |
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22 / 50 page  3–9 3.7.1 S2C (Start-Stop Communication) The S2C is a write-only interface selected by programming bits D1-D0 of control register 2 to 01. The SDA input is normally in a high state, pulled low (START bit) to start the communication, and pulled high (STOP bit) after the transmission of the LSB. Figure 3–9 shows the timing diagram of S2C. The S2C also supports a broadcast mode in which the same register of all devices in cascade is programmed in a single write. To use S2Cs broadcast mode, execute the following steps: 1. Write 111 1000 1111 1111 after the start bit to enable the broadcast mode. 2. Write data to program control register as specified in with bits D14–D11 = XXXX (don’t care). 3. Write 111 1000 0000 0000 after the start bit to disable the broadcast mode. D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 SCL SDA Start Bit = 0 Stop Bit = 1 SMARTDM Device Address (see Table 3–1) Register Address Register Content Figure 3–9. S2C Programming 3.7.2 I2C • Each I2C read-from or write-to AIC14s control register is given by index register address. • Read/write sequence always starts with the first byte as I2C address followed by 0. During the second byte, default/broadcast mode is set and the index register address is initialized. For write operation control register, data to be written is given from the third byte onwards. For read operation, stop-start is performed after the second byte. Now the first byte is I2C address followed by 1. From the second byte onwards, control register data appears. • Each time read/write is performed, the index register address is incremented so that next read/write is performed on the next control register. • During the first write cycle and all write cycles in the broadcast, only the device with address 0000 issues ACK to the I2C. I2C Write Sequence SCL SDA A5 A4 A3 A2 A1 A0 0 ACK B7 B6 B5 B4 B3 R2 R1 R0 A6 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 ACK ACK ACK Start Bit = 0 SMARTDM Device Address (see Table 3-1) 00000 = Default 11111 = Broadcast Mode Index Register Address (Index) Control Register Data for Write (Index) Control Register Data for Write (Index+1) 6 Programmable I2C Device Address Set by Control Register 2 I2C 5 I2C 4 I2C Figure 3–10. I2C Write Sequence |
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