EVAL-AD7730LEB View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
'EVAL-AD7730LEB' PDF : 52 Pages View PDF
AD7730/AD7730L
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.
START
CONTINUOUS
READS OF
REGISTER
REQUIRED?
YES
NO
WRITE BYTE W TO
COMMUNICATIONS REGISTER
(SEE ACCOMPANYING TABLE)
READ REGISTER
WRITE BYTE Y TO
COMMUNICATIONS REGISTER
(SEE ACCOMPANYING TABLE)
Register
Status Register
Data Register
Mode Register
Filter Register
DAC Register
Offset Register
Gain Register
Test Register
Byte W
(Hex)
10
11
12
13
14
15
16
17
Byte Y
(Hex)
20
21
22
N/A*
N/A*
N/A*
N/A*
N/A*
Byte Z
(Hex)
30
30
30
N/A*
N/A*
N/A*
N/A*
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.
READ REGISTER
STOP
NO
CONTINUOUS
READ
OPERATION?
YES
WRITE BYTE Z TO
COMMUNICATIONS REGISTER
(SEE ACCOMPANYING TABLE)
Figure 5. Flowchart for Reading from the AD7730 Registers
REV. A
START
WRITE BYTE Y TO
COMMUNICATIONS REGISTER
(SEE ACCOMPANYING TABLE)
WRITE TO REGISTER
END
Register
Communications Register
Data Register
Mode Register
Filter Register
DAC Register
Offset Register
Gain Register
Test Register
Byte Y (Hex)
00
Read Only Register
02
03
04
05
06
User is advised not to change
contents of Test Register.
Figure 6. Flowchart for Writing to the AD7730 Registers
–21–
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