AD7416 datasheet(13/20 Pages) AD

13 / 20 page

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.

3. Writing two bytes of data to the TOTI or THYST Register.

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

two bytes of data must be written to the TOTI and THYST

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.

Reading data from the temperature value, TOTI or THYST Regis-

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.

SCL

SDA

ACK. BY

AD7416

START BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

ADDRESS POINTER REGISTER BYTE

ACK. BY

AD7416

D15

D14

D13

D12

D11

D10

ACK. BY

AD7416

STOP BY

MASTER

FRAME 3

MOST SIGNIFICANT DATA BYTE

SCL

(CONTINUED)

SDA

(CONTINUED)

ACK. BY

AD7416

STOP BY

MASTER

FRAME 4

LEAST SIGNIFICANT DATA BYTE

Figure 10. Writing to the Address Pointer Register Followed by Two Bytes of Data to the TOTI or THYST Register

SDA

NO ACK. BY

MASTER

START BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

SINGLE DATA BYTE FROM AD7416

ACK. BY

AD7416

SCL

STOP BY

MASTER

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

SCL

SDA

D15

D14

D13

D12

D11

D10

ACK. BY

MASTER

START BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

MOST SIGNIFICANT DATA BYTE FROM AD7416

ACK. BY

AD7416

NO ACK. BY

MASTER

STOP BY

MASTER

FRAME 3

LEAST SIGNIFICANT DATA BYTE FROM AD7416

SCL (CONTINUED)

SDA (CONTINUED)

Figure 12. Reading Two Bytes of Data from the TOTI or THYST Register

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