REV. G

AD7416/AD7417/AD7418

–13–

the Address Pointer Register, followed by the data byte writ-

ten to the selected data register. This is illustrated in Figure 9.

If 9-bit resolution is required for the temperature setpoints,

registers. This consists of the serial bus address, the register

address written to the address pointer register, followed by

two data bytes written to the selected data register. This is

illustrated in Figure 10.

READING DATA FROM THE AD7416/AD7417/AD7418

Reading data from the AD7416/AD7417/AD7418 is a one or

two byte operation. Reading back the contents of the Configura-

tion Register is a single byte read operation, as shown in Figure

11, the register address previously having been set by a single-

byte write operation to the Address Pointer Register.

ter, is a two-byte operation, as shown in Figure 12. It is also

possible to read the most significant bit of a 9-bit/10-bit register

in this manner.

R/

W

1

SCL

SDA

0

0

1

A2

A1

A0

P7

P6

P5

P4

P3

P2

P1

P0

ACK. BY

AD7416

START BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

ADDRESS POINTER REGISTER BYTE

19

1

ACK. BY

AD7416

9

D15

D14

D13

D12

D11

D10

D9

D8

ACK. BY

AD7416

STOP BY

MASTER

FRAME 3

MOST SIGNIFICANT DATA BYTE

19

SCL

(CONTINUED)

SDA

(CONTINUED)

D7

D6

D5

D4

D3

D2

D1

D0

ACK. BY

AD7416

STOP BY

MASTER

FRAME 4

LEAST SIGNIFICANT DATA BYTE

19

SDA

NO ACK. BY

MASTER

START BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

SINGLE DATA BYTE FROM AD7416

ACK. BY

AD7416

19

1

9

D7

D6

D5

D4

D3

D2

D1

D0

R/

W

A0

A1

A2

1

0

1

SCL

STOP BY

MASTER

0

Figure 11. Reading a Single Byte of Data from the Configuration Register

R/

W

1

SCL

SDA

00

1

A2

A1

A0

D15

D14

D13

D12

D11

D10

D9

D8

ACK. BY

MASTER

START BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

MOST SIGNIFICANT DATA BYTE FROM AD7416

19

1

ACK. BY

AD7416

9

D7

D6

D5

D4

D3

D2

D1

D0

NO ACK. BY

MASTER

STOP BY

MASTER

FRAME 3

LEAST SIGNIFICANT DATA BYTE FROM AD7416

19

SCL (CONTINUED)

SDA (CONTINUED)