ADM1034
http://onsemi.com
12
Figure 19. Reading Data from a Previously Selected Register
SCL
SDA
D7
D6
D5
D4
D3
D2
D1
D0
NO ACK. BY
ADM1034
START BY
MASTER
9
1
ACK. BY
ADM1034
9
STOP BY
MASTER
A2
A1
A0
1
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
DATA BYTE FROM ADM1034
R/W
A3
A4
A5
A6
Register Addresses for Single/Block Byte Modes
The ADM1034 supports single byte as well as block read
and write operations. The register address determines
whether a single byte or multiple byte (block) operation is
run. For a single byte operation, the MSB of the register
address is set to 0; for a multiple byte operation, it is set to 1.
The number of bytes read in a multiple byte operation is set
in the #Bytes/Block Read Register at Address 0x00. The
number of bytes written to the ADM1034 is specified during
the block write operation. The addresses quoted in the
register map and throughout this data sheet assume single
byte operation. For multiple byte operations, set the MSB of
each register address to 1.
Write Operations
The SMBus specifications define protocols for read and
write operations. The ADM1034 supports send byte, write
byte, and block byte SMBus write protocols. The following
abbreviations are used in the diagrams:
S START
P STOP
R READ
W WRITE
A ACKNOWLEDGE
A
NO ACKNOWLEDGE
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 a 7-bit address followed by the
write bit (low).
3. The addressed slave device asserts ACK on SDA.
4. The master sends the register address.
5. The slave asserts ACK on SDA.
6. The master asserts a stop condition on SDA, and
the transaction ends.
Figure 20. Send Byte
SLAVE
ADDRESS
S
REG
ADDRESS
W
A
A
P
The ADM1034 uses the send byte operation to write a
register address to the APR for a subsequent read from the
same address. (See Figure 24). The user may be required to
read data from the register immediately after setting up the
address. If so, the master can assert a repeat 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 register
address and one data byte to the slave device as follows:
1. The master asserts a start condition on SDA.
2. The master sends the 7-bit slave address followed
by a write bit (low).
3. The addressed slave device asserts ACK on SDA.
4. The master sends the register address. The MSB of
the register address should equal 0 for a write byte
operation. If the MSB equals 1, a block write
operation takes place.
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 to end
the transaction.
Figure 21. Write Byte Operation
SLAVE
ADDRESS
S
REG
ADDRESS
DATA
W
A
A
A
P
Block Write
In this operation, the master device writes a block of data
to a slave address as follows. A maximum of 32 bytes can be
written.
1. The master asserts a start condition on SDA.
2. The master sends the 7-bit slave address followed
by a write bit (low).
3. The addressed slave device asserts ACK on SDA.
4. The master sends the register address. The register
address sets up the address pointer register and
determines whether a block write (MSB = 1) or a
byte write (MSB = 0) takes place.
5. The slave asserts ACK on SDA.
6. The master sends the byte count.
7. The slave asserts ACK on SDA.
8. The master sends N data bytes.
9. The slave asserts ACK on SDA after each byte.
10. The master asserts a stop condition on SDA to end
the transaction.
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