ADL5308ACCZ-R7 datasheet(18/22 Pages) AD

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Data Sheet

ADL5308

SERIAL-PORT INTERFACE

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Rev. 0 | 18 of 22

PROTOCOL

The ADL5308 can be connected to an I2C bus interface as a

target device to control and monitor several of its internal (analog)

functions. For detailed timing requirements, see Serial-Interface

Timing Specifications. Data is sent one byte at a time, with the most

significant bit (MSB) first. Each instruction consists of one address

byte, followed by one or more data bytes. The ADL5308 supports

single-byte read and write, as well as autoincrement read/write

methods.

ADDRESS

The ADL5308 I2C device read and write addresses consist of a

fixed 7-bit device address equal to 0x6C, followed by one read-write

least significant bit (LSB) address bit. The LSB address bit equals

0 for a write instruction and 1 for a read instruction. The device

write address thus equals 0x6C left-shifted by one bit position

(multiply-by-two), which equals 0xD8. The device read address

equals the write address with the LSB changed from 0 to 1, equal to

0xD9.

SUPPORTED READ AND WRITE METHODS

The ADL5308 supports several I2C read and write methods:

►

Read/write a single register

►

Read/write multiple registers at once through autoincrement

Figure 40 summarizes the procedure for each method. Each trans-

action on the I2C bus is initiated by the controller, and starts with

sending a START condition, an HIGH-LOW transition on the SDA

line while SCL is high. Subsequently, the 8-bit device write address

(of the selected target) is transmitted, one bit per SCL clock pulse.

All addresses and data are transmitted over the bus with the MSB

first.

The ninth clock pulse is reserved to transmit the ACK (acknowl-

edge) signal from the target to the controller, to indicate that the

address is received. To send an ACK, the target pulls the SDA line

low. A NACK (not acknowledge) results if the SDA line remains

high. Depending on the transaction, a series of byte read/write

transfers follows, each ending with an ACK or NACK bit. The

transaction ends with a STOP condition sent by the controller, a

LOW-HIGH transition on the SDA line while SCK is high.

The autoincrement feature provides read/write access to multiple

consecutive registers in a single transaction. Each data byte is read

from/written to the next register with address one higher than the

previous, and followed by an ACK. The last byte read/written is

followed by a NACK for a read, ACK for a write, and a STOP

condition.

Figure 40. ADL5308 Serial Bus Read/Write Sequences

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