AD7730 datasheet(21/52 Pages) AD

21 / 52 page

AD7730/AD7730L

REV. A

–21–

READING FROM AND WRITING TO THE ON-CHIP REGISTERS

The AD7730 contains a total of thirteen on-chip registers. These registers are all accessed over a three-wire interface. As a result,

addressing of registers is via a write operation to the topmost register on the part, the Communications Register. Figure 5 shows a

flowchart for reading from the different registers on the part summarizing the sequence and the words to be written to access each of

the registers. Figure 6 gives a flowchart for writing to the different registers on the part, again summarizing the sequence and words

to be written to the AD7730.

Figure 5. Flowchart for Reading from the AD7730 Registers

Figure 6. Flowchart for Writing to the AD7730 Registers

Byte Y (Hex)

Communications Register

Data Register

Read Only Register

Mode Register

Filter Register

DAC Register

Offset Register

Gain Register

Test Register

User is advised not to change

contents of Test Register.

Byte W

Byte Y

Byte Z

(Hex)

Status Register

Data Register

Mode Register

Filter Register

N/A*

DAC Register

N/A*

Offset Register

N/A*

Gain Register

N/A*

Test Register

N/A*

*N/A= Not Applicable. Continuous reads of these registers does not make sense

as the register contents would remain the same since they are only changed by a

write operation.

START

WRITE

BYTE W TO

COMMUNICATIONS REGISTER

(SEE ACCOMPANYING TABLE)

YES

READ REGISTER

WRITE

BYTE Y TO

COMMUNICATIONS REGISTER

(SEE ACCOMPANYING TABLE)

READ REGISTER

YES

WRITE

BYTE Z TO

COMMUNICATIONS REGISTER

(SEE ACCOMPANYING TABLE)

STOP

CONTINUOUS

READ

OPERATION?

CONTINUOUS

READS OF

REQUIRED?

START

WRITE

BYTE Y TO

COMMUNICATIONS REGISTER

(SEE ACCOMPANYING TABLE)

WRITE TO REGISTER

END

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