AD7714YN datasheet(30/40 Pages) AD

30 / 40 page

AD7714

REV. C

–30–

Figure 8. Flowchart for Setting Up and Reading from the AD7714

CONFIGURING THE AD7714

The AD7714 contains eight on-chip registers that can be

accessed via the serial interface. Communication with any of

these registers is initiated by writing to the Communications

which is used to configure all registers after a power-up or reset.

The flowchart also shows two different read options—the first

where the

DRDY pin is polled to determine when an update of

the data register has taken place, the second where the

DRDY

bit of the Communications Register is interrogated to see if a

data register update has taken place. Also included in the flow-

ing diagram is a series of words which should be written to the

registers for a particular set of operating conditions. These con-

ditions are test channel (AIN6/AIN6), gain of 1, burnout cur-

rent off, no filter sync, bipolar mode, 24-bit word length, boost

off and maximum filter word (4000 decimal).

START

CONFIGURE & INITIALIZE µC/µP SERIAL PORT

POWER-ON/RESET FOR AD7714

WRITE TO COMMUNICATIONS REGISTER SETTING UP

CHANNEL & SETTING UP NEXT OPERATION TO BE A

WRITE TO THE FILTER HIGH REGISTER (27 HEX)

WRITE TO FILTER HIGH REGISTER SETTING

UP REQUIRED VALUES (4F HEX)

WRITE TO FILTER LOW REGISTER SETTING

UP REQUIRED VALUES (A0 HEX)

WRITE TO MODE REGISTER SETTING UP REQUIRED

VALUES & INITIATING A CALIBRATION (20 HEX)

WRITE TO COMMUNICATIONS REGISTER SETTING UP

SAME CHANNEL & SETTING UP NEXT OPERATION TO

BE A WRITE TO THE FILTER LOW REGISTER (37 HEX)

WRITE TO COMMUNICATIONS REGISTER SETTING UP

SAME CHANNEL & SETTING UP NEXT OPERATION TO

BE A WRITE TO THE MODE REGISTER (17 HEX)

POLL

DRDY PIN

DRDY

LOW?

YES

WRITE TO COMMUNICATIONS REGISTER SETTING UP

SAME CHANNEL & SETTING UP NEXT OPERATION TO

BE A READ FROM THE DATA REGISTER (5F HEX)

READ FROM DATA REGISTER

DRDY

LOW?

POLL

DRDY BIT OF COMMUNICATIONS REGISTER

YES

WRITE TO COMMUNICATIONS REGISTER SETTING UP

SAME CHANNEL & SETTING UP NEXT OPERATION TO

BE A READ FROM THE DATA REGISTER (5F HEX)

READ FROM DATA REGISTER

WRITE TO COMMUNICATIONS REGISTER SETTING UP

SAME CHANNEL & SETTING UP NEXT OPERATION TO BE A

READ FROM THE COMMUNICATIONS REGISTER (0F HEX)

READ FROM COMMUNICATIONS REGISTER

AD7714YN Datasheet(PDF) 30 Page - Analog Devices

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