ADT7420

Preliminary Technical Data

Rev. PrA | Page 20 of 2

NOTES

1. A START CONDITION AT THE BEGINNING IS DEFINED AS A HIGH-TO-LOW TRANSITION ON SDA WHILE SCL REMAINS HIGH.

2. A STOP CONDITION AT THE END IS DEFINED AS A LOW-TO-HIGH TRANSITION ON SDA WHILE SCL REMAINS HIGH.

3. THE MASTER GENERATES THE NO ACKNOWLEDGE AT THE END OF THE READBACK TO SIGNAL THAT IT DOES NOT WANT ADDITIONAL DATA.

4. TEMPERATURE VALUE REGISTER MSB DATA AND TEMPERATURE VALIUE REGISTER LSB DATA ARE ALWAYS SEPARATED BY A LOW ACK BIT.

5. THE R/W BIT IS SET TO A1 TO INDICATE A READBACK OPERATION.

SDA

1

0

0

R/W

A7

A6

SCL

SDA

SCL

1

A1

A0

1

1

0

A1

A0

9

ADT7410 DEVICE ADDRESS

REGISTER ADDRESS[A7:A0]

D1

D0

D7

D6

TEMPERATURE

VALUE REGISTER

MSB DATA

9

1

1

9

9

0

1

A1

A0

R/W

REPEAT

START

D1

D0

D7

D6

ACK. BY

ADT7420

ACK. BY

MASTER

NO

ACK. BY

MASTER

ACK. BY

ADT7420

START

ADT7410 DEVICE ADDRESS

ACK. BY

ADT7420

TEMPERATURE

VALUE REGISTER

LSB DATA

SR

Figure 17. Reading Back Data from the Temperature Value Register