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AD8153 Datasheet(PDF) 16 Page - Analog Devices |
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AD8153 Datasheet(HTML) 16 Page - Analog Devices |
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16 / 24 page  AD8153 Rev. 0 | Page 16 of 24 I2C DATA WRITE To write data to the AD8153 register set, a microcontroller, or any other I2C master, needs to send the appropriate control signals to the AD8153 slave device. The steps that need to be followed are listed below, where the signals are controlled by the I2C master unless otherwise specified. A diagram of the procedure is shown in Figure 32. 1. Send a start condition (while holding the SCL line high, pull the SDA line low). 2. Send the AD8153 part address (seven bits) whose upper four bits are the static value b1001 and whose lower three bits are controlled by the input pins I2C_A[2:0]. This transfer should be MSB first. 3. Send the write indicator bit (0). 4. Wait for the AD8153 to acknowledge the request. 5. Send the register address (eight bits) to which data is to be written. This transfer should be MSB first. 6. Wait for the AD8153 to acknowledge the request. 7. Send the data (eight bits) to be written to the register whose address was set in Step 5. This transfer should be MSB first. 8. Wait for the AD8153 to acknowledge the request. 9. Send a stop condition (while holding the SCL line high, pull the SDA line high) and release control of the bus. 10. Send a repeated start condition (while holding the SCL line high, pull the SDA line low) and continue with Step 2 in this procedure to perform another write. 11. Send a repeated start condition (while holding the SCL line high, pull the SDA line low) and continue with Step 2 of the read procedure (in the I2C Data Read section) to perform a read from another address. 12. Send a repeated start condition (while holding the SCL line high, pull the SDA line low) and continue with step 8 of the read procedure (in the I2C Data Read section) to perform a read from the same address set in Step 5. The AD8153 write process is shown in Figure 32. The SCL signal is shown along with a general write operation and a specific example. In the example, data 0x92 is written to Address 0x6D of an AD8153 part with a part address of 0x4B. The part address is seven bits wide and is composed of the AD8153 static upper four bits (b1001) and the pin programmable lower three bits (I2C_ADDR[2:0]). In this example, the I2C_ADDR bits are set to b011. In Figure 32, the corresponding step number is visible in the circle under the waveform. The SCL line is driven by the I2C master and never by the AD8153 slave. As for the SDA line, the data in the shaded polygons is driven by the AD8153, whereas the data in the non- shaded polygons is driven by the I2C master. The end phase case shown is that of 9a. It is important to note that the SDA line only changes when the SCL line is low, except for the case of sending a start, stop, or repeated start condition, Step 1 and Step 9 in this case. SCL SDA (GENERAL CASE) SDA (EXAMPLE) START FIXED PART ADDR ADDR [2:0] RW ACK REGISTER ADDR ACK DATA ACK STOP 12 3 4 25 6 7 8 9a Figure 32. I2C Write Diagram |
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