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AD8153-EVALZ Datasheet(PDF) 17 Page - Analog Devices |
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AD8153-EVALZ Datasheet(HTML) 17 Page - Analog Devices |
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17 / 24 page  AD8153 Rev. 0 | Page 17 of 24 I2C DATA READ To read data from 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 to be followed are listed below, where the signals are controlled by the I2C master unless otherwise specified. A diagram of the procedure can be seen in Figure 33. 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_ADDR[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) from which data is to be read. This transfer should be MSB first. The register address is kept in memory in the AD8153 until the part is reset or the register address is written over with the same procedure (Step 1 to Step 6). 6. Wait for the AD8153 to acknowledge the request. 7. Send a repeated start condition (while holding the SCL line high, pull the SDA line low). 8. 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_ADDR[1:0]. This transfer should be MSB first. 9. Send the read indicator bit (1). 10. Wait for the AD8153 to acknowledge the request. 11. The AD8153 then serially transfers the data (eight bits) held in the register indicated by the address set in Step 5. 12. Acknowledge the data. 13. Send a stop condition (while holding the SCL line high, pull the SDA line high) and release control of the bus. 14. Send a repeated start condition (while holding the SCL line high, pull the SDA line low) and continue with Step 2 of the write procedure (see the I2C Data Write section) to perform a write. 15. Send a repeated start condition (while holding the SCL line high, pull the SDA line low) and continue with Step 2 of this procedure to perform a read from another address. 16. Send a repeated start condition (while holding the SCL line high, pull the SDA line low) and continue with Step 8 of this procedure to perform a read from the same address. The AD8153 read process is shown in Figure 33. The SCL signal is shown along with a general read operation and a specific example. In the example, Data 0x49 is read from 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 33, 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 nonshaded polygons is driven by the I2C master. The end phase case shown is that of 13a. 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, as in Step 1, Step 7, and Step 13. In Figure 33, A is the same as ACK in Figure 32. Equally, Sr represents a repeated start where the SDA line is brought high before SCL is raised. SDA is then dropped while SCL is still high. SCL SDA (GENERAL CASE) SDA (EXAMPLE) START FIXED PART ADDR ADDR [2:0] R W A REGISTER ADDR A DATA A STOP 12 3 4 25 6 7 8 9 10 11 12 13a 8 Sr FIXED PART ADDR ADDR [2:0] R W A Figure 33. I2C Read Diagram |
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