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ADT7462
Serial Bus Interface
The ADT7462 is controlled through use of the serial
system management bus (SMBus). The ADT7462 is
connected to this bus as a slave device, under the control of
a master controller. The SMBus interface in the ADT7462
is fully SMBus 1.1 and SMBus 1.0 compliant. The SMBus
address is determined by the state of the ADD input on
powerup.
ADD Input
The ADD pin is a three-state input to the ADT7462. It is
used to determine the SMBus address used. This pin is
sampled on powerup only. Any changes subsequent to
powerup are not reflected until the ADT7462 is powered
down and back up again. The corresponding 7-bit SMBus
address for the state of the ADD pin is shown in Table 11.
Table 11. CORRESPONDING SMBUS ADDRESSES
FOR ADD INPUT
ADD Pin SMBus Version SMBus Address
3. Data is sent over the serial bus in sequences of
nine clock pulses: eight bits of data followed by an
acknowledge bit from the slave device. Transitions
on the data line must occur during the low period
of the clock signal and remain stable during the
high period, because a low-to-high transition when
the clock is high can be interpreted as a stop
signal. The number of data bytes that can be
transmitted over the serial bus in a single read or
write operation is limited only by what the master
and slave devices can handle.
4. When all data bytes have been read or written,
stop conditions are established. In write mode, the
master releases the data line during the 10th clock
pulse to assert a stop condition. In read mode, the
master device overrides the acknowledge bit by
pulling the data line high during the low period
before the 9th clock pulse. This is known as a no
acknowledge. The master then takes the data line
low during the low period before the 10th clock
High
Float
Low
N/A
SMBus 1.1
SMBus 1.1
N/A
0x5C
0x58
pulse and then takes it high during the 10th clock
pulse to assert a stop condition.
Any number of bytes of data can be transferred over the
SMBus Fixed Address
The ADT7462 supports SMBus fixed address mode and
is fully backward compatible with SMBus 1.1 and SMBus
1.0. The ADT7462 powers up with a fixed SMBus address
that cannot be changed by the assign address call. The fixed
address is set by the state of the ADD input pin on powerup.
The ADT7462 also responds to the SMBus device default
address of 0x61.
SMBus Operation
The SMBus specification defines specific conditions for
different types of read and write operations. The general
SMBus protocol operates as follows:
1. The master initiates data transfer by establishing a
start condition, defined as a high-to-low transition
on the serial data line, SDA, while the serial clock
line, SCL, remains high. This indicates that an
address/data stream follows. All slave peripherals
connected to the serial bus respond to the start
condition and shift in the next eight bits, consisting
of a 7-bit address (MSB first) plus a R/W bit,
which determines the direction of the data transfer,
that is, whether data is written to or read from the
slave device.
2. The peripheral whose address corresponds to the
transmitted address responds by pulling the data
line low during the low period before the 9th clock
pulse, known as the acknowledge bit. All other
devices on the bus remain idle while the selected
device waits f or data to be read from it or written
to it. If the R/W bit = 0, the master writes to the
slave device. If the R/W bit = 1, the master reads
serial bus in one operation, but it is not possible to mix read
and write in one operation because the type of operation is
determined at the beginning and cannot subsequently be
changed without starting a new operation.
For the ADT7462, write operations contain either one or
two bytes, and read operations contain one byte. To write
data to one of the device data registers or to 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 write operation is shown in Figure 24. The device
address is sent over the bus, and then R/W is set to 0. This
is followed by two data bytes. The first data byte is the
address of the internal data register to be written to, which
is stored in the address pointer register. The second data byte
is the data to be written to the internal data register.
When reading data from a register, there are two
possibilities.
? If the ADT7462 address pointer register value is
unknown or not the desired value, it must be set to the
correct value before data can be read from the desired
data register. This is done by performing a write to the
ADT7462 as before, but only the data byte containing
the register address is sent because no data is written to
the register (see Figure 25).
A read operation is then performed, consisting of the
serial bus address and the R/W bit set to 1, followed by
from the slave device.
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