EVAL-AD5110SDZ Analog Devices, EVAL-AD5110SDZ Datasheet - Page 23

• Manufacturer Part Number: EVAL-AD5110SDZ
• Description: Digital Potentiometer Development Tools Evaluation board
• Manufacturer: Analog Devices
• Series: AD5110r

Specifications of EVAL-AD5110SDZ

• Rohs: yes
• Product: Evaluation Boards
• Tool Is For Evaluation Of: AD5110
• Resistance: 10 kOhms
• Operating Supply Voltage: 5.5 V
• Interface Type: I2C
• Maximum Operating Temperature: + 125 C
• Factory Pack Quantity: 1

Data Sheet
EEPROM WRITE ACKNOWLEGDE POLLING
After each write operation to the EEPROM, an internal write
cycle begins. The I
determine if the internal write cycle is complete and the I
interface is enabled, interface polling can be executed. I
interface polling can be conducted by sending a start condition,
followed by the slave address and the write bit. If the I
interface responds with an acknowledge, the write cycle is
complete, and the interface is ready to proceed with further
operations. Otherwise, I
until it succeeds.
READ OPERATION
The
of the RDAC register and EEPROM memory through the I
interface by using Command 6 (see Table 10).
When reading data back from the AD5110/AD5112/AD5114,
the user must first issue a readback command to the device.
This begins with a start command, followed by an address
byte (R/ W = 0), after which the
acknowledges that it is prepared to receive data by pulling
SDA low.
Two bytes of data are then written to the AD5110/AD5112/
AD5114, the most significant byte followed by the least
significant byte. Both of these data bytes are acknowledged by
the AD5110/AD5112/AD5114. A stop condition follows. These
bytes contain the read instruction, which enables readback of
AD5110/AD5112/AD5114
SDA
SDA
SCL
SCL
START BY
START BY
MASTER
MASTER
2
C interface of the device is disabled. To
0
0
1
1
2
C interface polling can be repeated
1
1
SERIAL BUS ADDRESS BYTE
SERIAL BUS ADDRESS BYTE
AD5110/AD5112/AD5114
allow read back of the contents
0
0
SDA (CONTINUED)
SCL (CONTINUED)
FRAME 1
FRAME 1
1
1
1
1
A1
A1
Figure 45.
2
A0
C
A0
2
C
2
C
2
AD5110
R/W
R/W
C
9
Rev. B | Page 23 of 28
ACK. BY
ACK. BY
AD5110
AD5110
D7
1
9
9
Interface Read Command
D6
D7
0
1
1
the RDAC register, EEPROM memory. The user can then read
back the data. This begins with a start command followed by an
address byte (R/ W = 1), after which the device acknowledges
that it is prepared to transmit data by pulling SDA low. Two
bytes of data are then read from the device, which are both
acknowledged by the master, as shown in Figure 45. A stop
condition follows. If the master does not acknowledge the first
byte, then the second byte is not transmitted by the AD5110/
AD5112/AD5114.
The
readback.
RESET
The
Command 4 (see Table 10). The reset command loads the
RDAC register with the contents of the EEPROM and takes
approximately 25 µs. EEPROM is pre-loaded to midscale at the
factory, and initial power-up is, accordingly, at midscale.
SHUTDOWN MODE
The
the software shutdown command, Command 3 (see Table 10).
This feature places the RDAC in a zero-power-consumption
state where Terminal A is open-circuited and the wiper,
Terminal W is connected to Terminal B but a finite wiper
resistance of 45 Ω is present. The part can be taken out of
shutdown mode by executing Command 3 (see Table 10)
and setting Bit DB0 to 0.
LEAST SIGNIFICANT DATA BYTE
D5
D6
0
AD5110/AD5112/AD5114
AD5110/AD5112/AD5114
AD5110/AD5112/AD5114
MOST SIGNIFICANT DATA BYTE
MOST SIGNIFICANT DATA BYTE
D5
D4
0
FRAME 3
D4
D3
0
FRAME 2
FRAME 2
D2
D3
0
C2
D2
AD5110/AD5112/AD5114
D1
C1
D1
D0
ACK. BY
AD5110
does not support repeat
can be reset by executing
can be shut down by executing
D0
C0
9
BY MASTER
NO ACK.
ACK. BY
AD5110
STOP BY
MASTER
9
9
STOP BY
MASTER