AD8153 查看數據表（PDF） - Analog Devices

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AD8153

XStream™ 3.2 Gbps Single Buffered Mux/Demux Switch

Analog Devices 

AD8153

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.

SCL

Data Sheet

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.

SDA

(GENERAL CASE)

START

FIXED PART ADDR

ADDR

[2:0]

RW ACK

REGISTER ADDR

SDA

(EXAMPLE)

1

2

2

34

5

Figure 32. I2C Write Diagram

ACK

6

DATA

7

ACK STOP

8 9a

Rev. A | Page 16 of 24

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