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ADT7476
1
9
1
9
SCL
SDA
0
1
0
1
1
A1
A0 R/W
D7
D6
D5
D4
D3
D2
D1
D0
START BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
ACK. BY
ADT7476
FRAME 2
DATA BYTE FROM ADT7476
NO ACK. BY STOP BY
MASTER MASTER
Figure 20. Reading Data from a Previously Selected Register
S ADDRESS W A
A
DATA
A P
Write Operations
The SMBus specification defines several protocols for
different types of read and write operations. The ones used
in the ADT7476 are discussed below. The following
abbreviations are used in the diagrams:
? S – START
? P – STOP
? R – READ
? W– WRITE
? A – ACKNOWLEDGE
? A – NO ACKNOWLEDGE
The ADT7476 uses the following SMBus write protocols.
Send Byte
In this operation, the master device sends a single
command byte to a slave device, as follows:
1. The master device asserts a start condition on SDA.
2. The master sends the 7-bit slave address followed
by the write bit (low).
3. The addressed slave device asserts ACK on SDA.
4. The master sends a command code.
5. The slave asserts ACK on SDA.
6. The master asserts a stop condition on SDA, and
the transaction ends.
For the ADT7476, the send byte protocol is used to write
a register address to RAM for a subsequent single-byte read
from the same address. This operation is illustrated in
Figure 21.
3. The addressed slave device asserts ACK on SDA.
4. The master sends a command code.
5. The slave asserts ACK on SDA.
6. The master sends a data byte.
7. The slave asserts ACK on SDA.
8. The master asserts a stop condition on SDA,
and the transaction ends.
This operation is illustrated in Figure 22.
1 2 3 4 5 6 7 8
SLAVE REGISTER
ADDRESS
Figure 22. Single-byte Write to a Register
Read Operations
The ADT7476 uses the following SMBus read protocols.
Receive Byte
This operation is useful when repeatedly reading a single
register. The register address is set up beforehand. In this
operation, the master device receives a single byte from a
slave device, as follows:
1. The master device asserts a start condition on SDA.
2. The master sends the 7-bit slave address followed
by the read bit (high).
3. The addressed slave device asserts ACK on SDA.
4. The master receives a data byte.
5. The master asserts NO ACK on SDA.
6. The master asserts a stop condition on SDA, and
the transaction ends.
1
S
2
SLAVE
ADDRESS
3
W A
4
REGISTER
ADDRESS
5 6
A P
In the ADT7476, the receive byte protocol is used to read
a single byte of data from a register whose address has
previously been set by a send byte or write byte operation.
Figure 21. Setting a Register Address for
This operation is illustrated in Figure 23.
Subsequent Read
1
2
3
4
5 6
S ADDRESS R A
If the master is required to read data from the register
immediately after setting up the address, it can assert a repeat
SLAVE
DATA
A P
start condition immediately after the final ACK and carry
out a single byte read without asserting an intermediate stop
condition.
Write Byte
In this operation, the master device sends a command byte
and one data byte to the slave device, as follows:
1. The master device asserts a start condition on SDA.
2. The master sends the 7-bit slave address followed
by the write bit (low).
Figure 23. Single-byte Read from a Register
Alert Response Address
Alert response address (ARA) is a feature of SMBus
devices, allowing an interrupting device to identify itself to
the host when multiple devices exist on the same bus.
The SMBALERT output can be used as either an interrupt
output or an SMBALERT. One or more outputs can be
connected to a common SMBALERT line connected to the
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