AD7715_15 datasheet(31/40 Pages) AD

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AD7715

Rev. D | Page 31 of 40

CONFIGURING THE AD7715

The AD7715 contains three on-chip registers which the user

accesses 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

flowing diagram is a series of words which should be written

to the registers for a particular set of operating conditions.

These conditions are gain of 1, no filter sync, bipolar mode,

buffer off, clock of 2.4576 MHz, and an output rate of 60 Hz.

START

CONFIGURE AND INITIALIZE

MICROCONTROLLER/MICROPROCESSOR SERIAL PORT

POWER-ON/RESET FOR AD7715

WRITE TO COMMUNICATIONS REGISTER SETTING UP

GAIN AND SETTING UP NEXT OPERATION TO BE A

WRITE TO THE SETUP REGISTER (10 HEX)

WRITE TO SETUP REGISTER SETTING UP REQUIRED

VALUES AND INITIATING A SELF CALIBRATION (68 HEX)

POLL DRDY PIN

DRDY

LOW?

YES

WRITE TO COMMUNICATIONS REGISTER SETTING UP

SAME GAIN AND SETTING UP NEXT OPERATION TO

BE A READ FROM THE DATA REGISTER (38 HEX)

READ FROM DATA REGISTER

POLL DRDY BIT OF COMMUNICATIONS REGISTER

YES

WRITE TO COMMUNICATIONS REGISTER SETTING UP

SAME GAIN AND SETTING UP NEXT OPERATION TO BE

A READ FROM THE DATA REGISTER (38 HEX)

WRITE TO COMMUNICATIONS REGISTER SETTING UP SAME

GAIN AND SETTING UP NEXT OPERATION TO BE A READ FROM

THE COMMUNICATIONS REGISTER (08 HEX)

READ FROM COMMUNICATIONS REGISTER

READ FROM DATA REGISTER

DRDY

LOW?

Figure 10. Flow Chart for Setting Up and Reading from the AD7715

AD7715 Datasheet(PDF) 31 Page - Analog Devices

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