AD7992 datasheet(17/21 Pages) AD

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AD7992

–17–

REV. PrH

PRELIMINARYTECHNICAL DATA

Figure 11. Single Byte Write Sequence

Figure 12. Two Byte Write Sequence

READING DATA FROM THE AD7992

Reading data from the AD7992 is a one or two byte op-

eration. Reading back the contents of the Configuration

ter is a single byte read operation as shown in Figure 13.

This assumes the particular register address has previously

been set up by a single byte write operation to the Address

Pointer Register, Figure 10. Once the register address has

been set up, any number of reads can subsequently 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, then the relevant register

address will have to be written to the Address Pointer

may then be performed.

Reading data from the Conversion Result Register,

DATAHIGH Registers, DATALOW Registers or Hysteresis

Registers is a two byte operation as shown in Figure 14.

The same rules apply for a two byte read as a single byte

read.

ALERT/BUSY PIN

The ALERT/BUSY may be configured as an Alert or

Busy ouput as shown in Table VI.

SMBus ALERT

The AD7992 ALERT output is an SMBus interrupt line

for devices that want to trade their ability to master for an

extra pin. The AD7992 is a slave only device and uses the

SDA

ACK. BY

AD7992

START BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

ADDRESS POINTER REGISTER BYTE

ACK. BY

AD7992

SCL

STOP BY

MASTER

ACK. BY

AD7992

FRAME 3

DATA BYTE

SCL (CONTINUED)

SDA (CONTINUED)

SDA

ACK. BY

AD7992

START BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

ADDRESS POINTER REGISTER BYTE

ACK. BY

AD7992

SCL

STOP BY

MASTER

ACK. BY

AD7992

LEAST SIGNIFICANT DATA BYTE

SCL (CONTINUED)

SDA (CONTINUED)

D10

D11

STOP BY

MASTER

ACK. BY

AD7992

MOST SIGNIFICANT DATA BYTE

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