ADM1034

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11

ADM1034 as before, but send only the data byte containing

the register. (See Figure 18.) A read operation is then

performed, using the serial bus address and the R/W bit set

to 1, followed by the data byte read from the data register.

(See Figure 19.)

However, if the APR is already at the desired address, data

can be read from the corresponding data register without

first writing to the APR. In this case, Figure 18 can be

omitted.

In Figure 17 to Figure 19, the serial bus address is

determined by the state of the LOCATION pin on powerup.

Figure 17. Writing a Register Address to the Address Pointer Register, then Writing Data to the Selected Register

Figure 18. Writing to the Address Pointer Register Only (Send Byte)

Figure 19. Reading Data from a Previously Selected Register

START BY

MASTER

STOP BY

MASTER

ACK. BY

ADM1034

ACK. BY

ADM1034

ACK. BY

ADM1034

A6

11

9

9

A5

A4

A3

A2

A1

A0

R/W

D7

D6

D5

D4

D3

D2

D1

D0

SCL

SDA

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

ADDRESS POINTER REGISTER BYTE

FRAME 3

DATA BYTE

SDA (CONTINUED)

SCL (CONTINUED)

9

1

D7

D6

D5

D4

D3

D2

D1

D0

STOP BY

MASTER

ACK. BY

ADM1034

ACK. BY

ADM1034

START BY

MASTER

SCL

11

9

9

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

ADDRESS POINTER REGISTER BYTE

A6

A5

A4

A3

A2

A1

A0

R/W

D7

D6

D5

D4

D3

D2

D1

D0

SDA

STOP BY

MASTER

START BY

MASTER

ACK. BY

ADM1034

NO ACK. BY

ADM1034

R/W

SCL

11

9

9

SDA

A6

A5

A4

A3

A2

A1

A0

D7

D6

D5

D4

D3

D2

D1

D0

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

DATA BYTE FROM ADM1034

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.