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ISL29038IROZ-T7 Datasheet(PDF) 6 Page - Intersil Corporation |
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ISL29038IROZ-T7 Datasheet(HTML) 6 Page - Intersil Corporation |
6 / 15 page ISL29038 6 FN7851.1 January 23, 2015 Submit Document Feedback ISL29038 Configuration and Control I2C Interface ISL29038 configuration and control is performed using the I2C or SMBus. The ISL29038’s I2C interface slave address is internally hard wired as 8’b1000100x, where x denotes the R/W bit. Every I2C transaction begins with the master asserting a start condition (SDA falling while SCL remains high). The first transmitted byte is initiated by the master and includes 7 address bits and a R/W bit. The slave is responsible for pulling SDA low during the ACK time after every transmitted byte. Figure 5 shows a sample one-byte read. The I2C bus master always drives the SCL (clock) line, while either the master or the slave can drive the SDA (data) line. Each I2C transaction ends with the master asserting a stop condition (SDA rising while SCL remains high). For more information about the I2C standard, consult the Philips™ I2C specification documents. Timing specifications are included in “I2C Electrical Specifications” on page 4. The timing parameters are defined in Figure 4. The I2C interface on the ISL29038 supports single and multiple byte read and write transfers using the random-read/write protocol. The ISL29038 does not support I2C ‘Repeat Start’ protocol. NOTE: That in most system implementations, the ISL29038 is connected to a single I2C master with one or more slave devices, consequently, absence of ‘Repeat Start’ function does not adversely affect I2C bus system performance. FIGURE 5. I2C DRIVER TIMING DIAGRAM FOR MASTER AND SLAVE CONNECTED TO COMMON BUS START W A A A6 A5 A4 A3 A2 A1 A0 W A R7 R6 R5 R4 R3 R2 R1 R0 A A6 A5 A4 A3 A2 A1 A0 W A A A A D7 D6 D5 D4 D3D2 D1D0 13 5 7 13 57 1 2 3 4 5 6 9 2 4 6 STOP START SDA DRIVEN BY MASTER DEVICE ADDRESS SDA DRIVEN BY ISL29038 DATA BYTE0 REGISTER ADDRESS SLAVE DEVICE ADDRESS I2C DATA SDA DRIVEN BY MASTER SDA DRIVEN BY MASTER 24 68 9 2 468 9 7 8 1 3 5 7 8 9 I2C SDA I2C SDA I2C CLK MASTER (ISL29038) |
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