AD7280ABSTZ datasheet(40/48 Pages) AD

40 / 48 page

AD7280A

Rev. 0 | Page 40 of 48

Example 3: Convert and Read All Parts, All Voltages,

and Three Auxiliary ADC Inputs per Part

In this example, it is assumed that all AD7280As in the daisy

chain have been initialized to their correct device addresses.

Write Register Address 0x00 to the read register on all

parts. A device address of 0x00 is used when computing

the CRC for commands to write to all parts. The 32-bit

write command is 0x038011CA (see Table 25, Write 1).

Note that 0x00 is the default value of the read register on

power-up and after a software reset; therefore, this write

operation may not be necessary.

Set Bit D15 and Bit D13 of the control register to 0 on all

parts. Set Bit D14 and Bit D12 of the control register to 1

on all parts. The 32-bit write command is 0x01AA1062

(see Table 25, Write 2).

Program the CNVST control register to 0x02 on all parts

to allow conversions to be initiated using the CNVST pin.

The 32-bit write command is 0x03A0546A (see

Write 3).

Table 25

Initiate conversions through the falling edge of CNVST.

Allow sufficient time for all conversions to be completed

plus tWAIT. Following the completion of all conversions,

apply a CS low pulse that frames 32 SCLKs for each conver-

sion result to be read back. The 32-bit write command is

0xF800030A, as described in the

section

(see

, Write 4).

Serial Interface

Table 25

Table 25. Example 3: Converting and Reading All Voltages and Three Auxiliary ADC Inputs from All AD7280A Devices

Write Command

Device Address

Data

Write All

D11

8-Bit CRC

D2 to D0

32-Bit Write

Command

Write 1

00000

011100

00000000

00111001

010

0x038011CA

Write 2

00000

001101

01010000

00001100

010

0x01AA1062

Write 3

00000

011101

00000010

10000101

010

0x03A0546A

Write 4

11111

000000

00000000

01100001

010

0xF800030A

AD7280ABSTZ 데이터시트(PDF) 40 Page - Analog Devices

AD7280ABSTZ 데이터시트(HTML) 40 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

데이터시트 다운로드

링크 URL