ADT75 datasheet(19/25 Pages) AD

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ADT75

Data Sheet

Rev. B | Page 18 of 24

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

ADDRESS POINTER REGISTER BYTE

ACK. BY

ADT75

ACK. BY

ADT75

ACK. BY

ADT75

STOP BY

MASTER

FRAME 4

DATA BYTE

SCL

SDA

START BY

MASTER

R/W

ACK. BY

ADT75

FRAME 3

DATA BYTE

SDA (CONTINUED)

SCL (CONTINUED)

D15

D14

D13

D12

D11

D10

Figure 16. Writing to the Address Pointer Register Followed by Two Bytes of Data to Either THYST or TOS Registers

SCL

SDA

START BY

MASTER

FRAME 1

SERIAL BUS ADDRESS

BYTE

FRAME 2

DATA BYTE FROM CONFIGURATION

STOP BY

MASTER

ACK. BY

ADT75

NO ACK. BY

MASTER

R/W

Figure 17. Reading Back Data from the Configuration Register

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

MSB DATA BYTE FROM TEMPERATURE

VALUE REGISTER

ACK. BY

ADT75

ACK. BY

MASTER

SCL

SDA

START BY

MASTER

D15

D14

D13

D12

D11

D10

R/W

NO ACK. BY

MASTER

STOP BY

MASTER

FRAME 3

LSB DATA BYTE FROM TEMPERATURE

VALUE REGISTER

SDA (CONTINUED)

SCL (CONTINUED)

Figure 18. Reading Back Data from the Temperature Value Register

READING DATA

Reading data from the ADT75 is done in a one data byte operation

for the configuration register and a two data byte operation for

the temperature value register, THYST register, and the TOS setpoint

is shown in Figure 17. Reading back the contents of the temperature

value register is shown in Figure 18. Reading back from any register

first requires a single-byte write operation to the address pointer

to be read from. To read from another register, execute another

write to the address pointer register to set up the relevant register

address. Thus, block reads are not possible, that is, there is no I2C

auto-increment. If the address pointer register has previously been

set up with the address of the register that is going to receive a

read command then there is no need to repeat a write operation

to set up the register address again.

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