AD7853_15 datasheet(29/34 Pages) AD

29 / 34 page

REV. B

–29–

AD7853/AD7853L

Interface Mode 1 Configuration

Figure 42 shows the flowchart for configuring the part in

Interface Mode 1. This mode of operation can only enabled by

writing to the control register and setting the 2/

3 MODE bit.

Reading and writing cannot take place simultaneously in this

mode as the DIN pin is used for both reading and writing.

APPLY

(IF REQUIRED),

SCLK, WRITE TO CONTROL REGISTER

SETTING THE TWO-WIRE MODE

SERIAL

INTERFACE

MODE

POWER-ON, APPLY CLKIN SIGNAL,

WAIT 150ms FOR AUTOMATIC CALIBRATION

YES

START

WAIT FOR BUSY SIGNAL TO GO

LOW OR WAIT FOR BUSY BIT = 0

PULSE

READ

DATA

DURING

CONVERSION

APPLY

(IF REQUIRED), SCLK, READ

CURRENT CONVERSION RESULT ON DIN PIN

INITIATE

CONVERSION

SOFTWARE

WAIT APPROXIMATLY 200ns

AFTER

RISING EDGE

OR AFTER END OF CONTROL

APPLY

(IF REQUIRED),

SCLK, READ PREVIOUS CONVERSION

RESULT ON DIN PIN

YES

APPLY

(IF REQUIRED),

SCLK, WRITE TO CONTROL REGISTER

SETTING THE TWO-WIRE MODE

AND CONVST BIT TO 1

Figure 42. Flowchart for Setting Up, Reading and Writing

in Interface Mode 1

Interface Modes 4 and 5 Configuration

Figure 43 shows the flowchart for configuring the AD7853/

AD7853L in Interface Modes 4 and 5, the self-clocking modes.

In this case it is not recommended to use the software conver-

sion start option. The read and write operations always occur

simultaneously and during conversion.

SERIAL

INTERFACE

MODE

POWER-ON, APPLY CLKIN SIGNAL,

WAIT 150ms FOR AUTOMATIC CALIBRATION

START

AUTOMATICALLY GOES

LOW AFTER

RISING EDGE

PULSE

SCLK AUTOMATICALLY ACTIVE, READ CURRENT

CONVERSION RESULT ON DOUT PIN, WRITE

TO CONTROL REGISTER ON DIN PIN

4, 5

Figure 43. Flowchart for Setting Up, Reading and Writing

in Interface Modes 4 and 5

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