AD7992 datasheet(24/29 Pages) AD

24 / 29 page

AD7992

Rev. 0 | Page 23 of 28

READING DATA FROM THE AD7992

Reading data from the AD7992 is a 1- or 2-byte operation.

Reading back the contents of the alert status register, the config-

uration register, or the cycle timer register is a single-byte read

operation, as shown in Figure 28. This assumes the particular

operation to the address pointer register (see Figure 25). Once

the register address has been set up, any number of reads can

be performed from that particular register without having to

write to the address pointer register again. If a read from a

different register is required, the relevant register address has

to be written to the address pointer register, and again any

number of reads from this register may then be performed.

Reading data from the conversion result register, DATAHIGH

registers, DATALOW registers, or hysteresis registers is a 2-byte

operation, as shown in Figure 29. The same rules apply for a

2-byte read as a 1-byte read.

When reading data back from a register, such as the conversion

result register, if more than two read bytes are supplied, the

same or new data is read from the AD7992 without the need to

re-address the device. This allows the master to continuously

read from a data register without having to re-address the

AD7992.

SDA

R/W

SCL

START BY

MASTER

ACK. BY

AD7992

NO ACK. BY

MASTER

STOP BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

SINGLE DATA BYTE FROM AD7992

Figure 28. Reading a Single Byte of Data from a Selected Register

SDA

ALERT-

FLAG

ZERO

D10

SCL

D11

D1/0

D0/0

SCL (CONTINUED)

SDA (CONTINUED)

ZERO CHID

R/W

START BY

MASTER

ACK. BY

AD7992

NO ACK. BY

MASTER

ACK. BY

MASTER

STOP BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

MOST SIGNIFICANT DATA BYTE FROM

AD7992

FRAME 2

MOST SIGNIFICANT DATA BYTE FROM

AD7992

Figure 29. Reading Two Bytes of Data from the Conversion Result Register

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