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PCM1796DB Datasheet(PDF) 21 Page - Burr-Brown (TI) |
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PCM1796DB Datasheet(HTML) 21 Page - Burr-Brown (TI) |
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21 / 57 page ![]() PCM1796 SLES100 − DECEMBER 2003 www.ti.com 21 I2C INTERFACE The PCM1796 supports the I2C serial bus and the data transmission protocol for standard and fast mode as a slave device. This protocol is explained in I2C specification 2.0. In I2C mode, the control terminals are changed as follows. TERMINAL NAME TDMCA NAME PROPERTY DESCRIPTION MS ADR0 Input I2C address 0 MDI ADR1 Input I2C address 1 MC SCL Input I2C clock MDO SDA Input/output I2C data Slave Address MSB LSB 1 0 0 1 1 ADR1 ADR0 R/W The PCM1796 has 7 bits for its own slave address. The first five bits (MSBs) of the slave address are factory preset to 10011. The next two bits of the address byte are the device select bits which can be user-defined by the ADR1 and ADR0 terminals. A maximum of four PCM1796s can be connected on the same bus at one time. Each PCM1796 responds when it receives its own slave address. Packet Protocol A master device must control packet protocol, which consists of start condition, slave address, read/write bit, data if write or acknowledge if read, and stop condition. The PCM1796 supports only slave receivers and slave transmitters. 9 SDA SCL St Start 1−7 8 1−8 9 1−8 9 9 Sp Stop Slave Address ACK DATA ACK DATA ACK ACK Condition Condition R/W Read Operation Transmitter M M M S S M S M M M Data Type St Slave Address R ACK DATA ACK DATA ACK NACK Sp Write Operation Transmitter M M M S M S M S S M Data Type St Slave Address W ACK DATA ACK DATA ACK ACK Sp R/W: Read Operation if 1; Otherwise, Write Operation ACK: Acknowledgement of a Byte if 0 NACK: Not Acknowledgement if 1 DATA: 8 Bits (Byte) M: Master Device S: Slave Device St: Start Condition Sp: Stop Condition W: Write R: Read ACK: Acknowledge NACK: Not Acknowledge Figure 31. Basic I2C Framework |
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