AD7294 datasheet(37/45 Pages) AD

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Preliminary Technical Data

AD7294

Writing Two Bytes of Data to a 16-Bit Register

Both types of limit registers, the hysteresis registers, the result

and the fuse registers are 16-bit registers; therefore, two bytes of

data are required to write a value to any one of these registers.

Writing two bytes of data to one of these registers consists of the

following:

The master device asserts a start condition on SDA.

The master sends the 7-bit slave address followed by the

write bit (low).

The addressed slave device asserts ACK on SDA.

The master sends a register address. The slave asserts ACK

on SDA.

The master sends the first data byte

The slave asserts ACK on SDA.

The master sends the second data byte.

The slave asserts ACK on SDA.

The master asserts a stop condition on SDA to end the

transaction.

SDA

ACK. BY

AD7294

ACK. BY

AD7294

R/W

SCL

D1/0

D0/0

ACK. BY

AD7294

STOP BY

MASTER

LEAST SIGNIFICANT DATA BYTE

MOST SIGNIFICANT DATA BYTE

SCL (CONTINUED)

SDA (CONTINUED)

FRAME 1

SERIAL BUS ADDRESS BYTE

START BY

MASTER

FRAME 2

ADDRESS POINTER REGISTER

D10

D11

ACK. BY

AD7294

Figure 34. 2-Byte Write Sequence

Rev PrB | Page 37 of 45

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