AD7993 datasheet(22/27 Pages) AD

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AD7994/AD7993

–22–

REV. PrF

PRELIMINARYTECHNICAL DATA

Figure 11. Single Byte Write Sequence

Figure 12. Two Byte Write Sequence

READING DATA FROM THE AD7994/AD7993

Reading data from the AD7994/AD7993 is a one or two

byte operation. Reading back the contents of the Configu-

ration Register, Alert Status Register or the Cycle Timer

13. This assumes the particular register address has previ-

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

Address Pointer Register, Figure 10. Once the register

SDA

ACK. BY

AD7994/3

START BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

ADDRESS POINTER REGISTER BYTE

ACK. BY

AD7994/3

SCL

STOP BY

MASTER

ACK. BY

AD7994/3

FRAME 3

DATA BYTE

SCL (CONTINUED)

SDA (CONTINUED)

SDA

ACK. BY

AD7994/3

START BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

ADDRESS POINTER REGISTER BYTE

ACK. BY

AD7994/3

SCL

D1/0

D0/0

STOP BY

MASTER

ACK. BY

AD7994/3

LEAST SIGNIFICANT DATA BYTE

SCL (CONTINUED)

SDA (CONTINUED)

D10

D11

STOP BY

MASTER

ACK. BY

AD7994/3

MOST SIGNIFICANT DATA BYTE

address has been set up, any number of reads can subse-

quently 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

Pointer Register and again any number of reads from this

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.

If the master is write addressing the AD7994/AD7993 and

wishes to write to more than one register, then after the

first write operation has completed for the first data regis-

ter in the next byte they can simply write to the address

pointer byte to select the next data register for a write

operation. This eliminates the need to re-address the de-

vice in order to write to another data register.

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