AD9985BSTZ-110 View Datasheet(PDF) - Analog Devices
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Description
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AD9985BSTZ-110 Datasheet PDF : 32 Pages
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Data is read from the control registers of the AD9985 in a
similar manner. Reading requires two data transfer operations:
The base address must be written with the R/W bit of the slave
address byte low to set up a sequential read operation.
Reading (the R/W bit of the slave address byte high) begins at
the previously established base address. The address of the read
register autoincrements after each byte is transferred.
To terminate a read/write sequence to the AD9985, a stop signal
must be sent. A stop signal comprises a low-to-high transition
of SDA while SCL is high.
A repeated start signal occurs when the master device driving
the serial interface generates a start signal without first
generating a stop signal to terminate the current communi-
cation. This is used to change the mode of communication
(read, write) between the slave and master without releasing the
serial interface lines.
Serial Interface Read/Write Examples
Write to one control register
• Start Signal
• Slave Address Byte (R/W Bit = Low)
• Base Address Byte
• Data Byte to Base Address
• Stop Signal
Write to four consecutive control registers
• Start Signal
• Slave Address Byte (R/W Bit = Low)
• Base Address Byte
AD9985
• Data Byte to Base Address
• Data Byte to (Base Address + 1)
• Data Byte to (Base Address + 2)
• Data Byte to (Base Address + 3)
• Stop Signal
Read from one control register
• Start Signal
• Slave Address Byte (R/W Bit = Low)
• Base Address Byte
• Start Signal
• Slave Address Byte (R/W Bit = High)
• Data Byte from Base Address
• Stop Signal
Read from four consecutive control registers
• Start Signal
• Slave Address Byte (R/W Bit = Low)
• Base Address Byte
• Start Signal
• Slave Address Byte (R/W Bit = High)
• Data Byte from Base Address
• Data Byte from (Base Address + 1)
• Data Byte from (Base Address + 2)
• Data Byte from (Base Address + 3)
• Stop Signal
SDA
BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 ACK
SCL
Figure 13. Serial Interface—Typical Byte Transfer
Rev. 0 | Page 27 of 32
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