AD7719 datasheet(28/40 Pages) AD

28 / 40 page

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AD7719

–28–

START

POWER-ON/RESET FOR AD7719

CONFIGURE AND INITIALIZE

C/ P SERIAL PORT

WRITE TO THE COMMUNICATIONS REGISTER

SELECTING NEXT OPERATION TO BE A WRITE

TO THE IOCON REGISTER

WRITE TO THE IOCON REGISTER TO CONFIGURE

THE CURRENT SOURCES, DIGITAL I/O PORT,

AND POWER SWITCHES

WRITE TO COMMUNICATIONS REGISTER SETTING

UP NEXT OPERATION TO BE A WRITE TO THE

FILTER REGISTER

WRITE TO FILTER REGISTER CONFIRMING

THE REQUIRED UPDATE RATE

WRITE TO COMMUNICATIONS REGISTER SETTING

UP NEXT OPERATION TO BE A WRITE TO THE AUX

CHANNEL ADC CONTROL REGISTER (AD1CON)

WRITE TO AD1CON REGISTER ENABLING THE AUX

ADC, SELECT THE INPUT CHANNEL BIPOLAR/

UNIPOLAR OPERATION AND INPUT RANGE

WRITE TO COMMUNICATIONS REGISTER SETTING

UP NEXT OPERATION TO BE A WRITE TO THE MAIN

CHANNEL ADC CONTROL REGISTER (AD0CON)

WRITE TO AD1CON REGISTER ENABLING THE MAIN

ADC, SELECT THE INPUT CHANNEL, WORD LENGTH,

BIPOLAR/UNIPOLAR OPERATION, AND INPUT RANGE

WRITE TO THE COMMUNICATIONS REGISTER

SETTING UP NEXT OPERATION TO BE A WRITE

TO THE MODE REGISTER

WRITE TO MODE REGISTER SELECTING

ZERO-SCALE CALIBRATION

HARDWARE

POLLING

SOFTWARE

POLLING

HARDWARE

POLLING

POLL

RDY PIN

RDY

LOW?

YES

WRITE TO THE COMMUNICATIONS REGISTER

SETTING UP NEXT OPERATION TO BE A WRITE

TO THE MODE REGISTER

WRITE TO MODE REGISTER SELECTING

FULL-SCALE CALIBRATION

POLL

RDY PIN

RDY

LOW?

YES

WRITE TO THE COMMUNICATIONS REGISTER

SETTING UP NEXT OPERATION TO BE A WRITE

TO THE MODE REGISTER

WRITE TO MODE REGISTER SELECTING

CONTINUOUS CONVERSION MODE

WRITE TO THE COMMUNICATIONS REGISTER SETTING

UP NEXT OPERATION TO BE A READ FROM THE

MAIN ADC DATA REGISTER (AD0)

POLL

RDY PIN

RDY

LOW?

YES

READ FROM DATA REGISTER (AD0)

POLL

RDY PIN

RDY

LOW?

YES

WRITE TO THE COMMUNICATIONS REGISTER SETTING

UP NEXT OPERATION TO BE A READ FROM THE

AUX ADC DATA REGISTER (AD1)

READ FROM DATA REGISTER (AD0)

SOFTWARE

POLLING

WRITE TO THE COMMUNICATIONS REGISTER

SETTING UP NEXT OPERATION TO BE A

READ FROM THE MODE REGISTER

READ FROM MODE REGISTER

MD BITS

= 001

YES

WRITE TO THE COMMUNICATIONS REGISTER

SETTING UP NEXT OPERATION TO BE A WRITE

TO THE MODE REGISTER

WRITE TO MODE REGISTER SELECTING

FULL-SCALE CALIBRATION

WRITE TO THE COMMUNICATIONS REGISTER

SETTING UP NEXT OPERATION TO BE A

READ FROM THE MODE REGISTER

READ FROM MODE REGISTER

MD BITS

= 001

YES

WRITE TO THE COMMUNICATIONS REGISTER

SETTING UP NEXT OPERATION TO BE A WRITE

TO THE MODE REGISTER

WRITE TO MODE REGISTER SELECTING

CONTINUOUS CONVERSION MODE

WRITE TO THE COMMUNICATIONS REGISTER

SETTING UP NEXT OPERATION TO BE A WRITE

TO THE MODE REGISTER

WRITE TO MODE REGISTER SELECTING

CONTINUOUS CONVERSION MODE

WRITE TO THE COMMUNICATIONS REGISTER

SETTING UP NEXT OPERATION TO BE A READ OF

STATUS REGISTER

READ STATUS REGISTER

RDY0 = 1

YES

WRITE TO THE COMMUNICATIONS REGISTER

SETTING UP NEXT OPERATION TO BE A READ

OF THE MAIN ADC DATA REGISTER (AD0)

READ AD0

WRITE TO THE COMMUNICATIONS REGISTER

SETTING UP NEXT OPERATION TO BE A READ OF

STATUS REGISTER

READ STATUS REGISTER

RDY1 = 1

YES

WRITE TO THE COMMUNICATIONS REGISTER

SETTING UP NEXT OPERATION TO BE A READ

OF THE AUX ADC DATA REGISTER (AD1)

READ AD1

Figure 11. Flowchart for Initializing, Calibrating, and Reading Data from the AD7719 Main and Aux Channels

AD7719 Datasheet(PDF) 28 Page - Analog Devices

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