EVAL-ADT7470EBZ Analog Devices Inc, EVAL-ADT7470EBZ Datasheet - Page 10

• Manufacturer Part Number: EVAL-ADT7470EBZ
• Description: Temperature Sensor Eval. Board
• Manufacturer: Analog Devices Inc

Specifications of EVAL-ADT7470EBZ

• Silicon Manufacturer: Analog Devices
• Application Sub Type: Temperature Sensor Hub & Fan Controller
• Kit Application Type: Power Management
• Silicon Core Number: ADT7470
• Sensor Type: Temperature
• Interface: SMBus (2-Wire/I²C)
• Voltage - Supply: 3 V ~ 5.5 V
• Embedded: No
• Utilized Ic / Part: ADT7470
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Sensitivity: -
• Sensing Range: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

ADT7470
Any number of bytes of data can be transferred over the serial
bus in one operation. However, it is not possible to mix read
and write in one operation, because the type of operation is
determined at the beginning and subsequently cannot be
changed without starting a new operation.
In the ADT7470, write operations contain either one or two
bytes, and read operations contain one byte and perform the
following functions.
during the low period before the 10th clock pulse, then
high during the 10th clock pulse to assert a stop condition.
SDA
SCL
SDA
SCL
START BY
START BY
MASTER
MASTER
SDA
SCL
START BY
MASTER
1
0
1
0
1
0
Figure 7. Writing a Register Address to the Address Pointer Register, Then Writing Data to the Selected Register
1
1
1
0
0
SERIAL BUS ADDRESS
SERIAL BUS ADDRESS
0
SERIAL BUS ADDRESS
1
1
FRAME 1
FRAME 1
BYTE
BYTE
1
FRAME 1
BYTE
1
1
1
SDA (CONTINUED)
SCL (CONTINUED)
Figure 9. Reading Data from a Previously Selected Register
A1
A1
Figure 8. Writing to the Address Pointer Register Only
A1
A0
A0
A0
R/W
R/W
R/W
ADT7470
ACK. BY
ADT7470
ACK. BY
Rev. C | Page 10 of 40
ADT7470
ACK. BY
9
9
D7
1
9
D7
D7
1
1
D6
D7
1
D6
D6
To write data to one of the device data registers or read data
from it, the address pointer register must be set so that the
correct data register is addressed. Then data can be written into
that register or read from it. The first byte of a write operation
always contains an address that is stored in the address pointer
register. If data is to be written to the device, the write operation
contains a second data byte that is written to the register selected
by the address pointer register.
This is illustrated in Figure 7. The device address is sent over the
bus followed by R/ W set to 0. This is followed by two data bytes.
D6
D5
ADDRESS POINTER REGISTER BYTE
D5
D5
ADDRESS POINTER REGISTER BYTE
D5
D4
DATA BYTE FROM
FRAME 3
D4
D4
DATA
BYTE
D3
D4
FRAME 2
ADT7470
FRAME 2
D3
D3
FRAME 2
D3
D2
D2
D2
D2
D1
D1
D1
D0
D1
ADT7470
ACK. BY
D0
D0
BY MASTER
D0
NO ACK.
9
ADT7470
ACK. BY
ADT7470
ACK. BY
9
9
9
STOP BY
MASTER
STOP BY
MASTER
STOP BY
MASTER