AD4682 datasheet(25/30 Pages) AD

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Data Sheet

AD4682/AD4683

Rev. 0 | Page 25 of 30

Table 12. Example CRC Calculation for 16-Bit Two-Channel Data

Data

1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 X1 X1 X1 X1 X1 X1 X1 X1

Process Data 0 1 0 1 0 1 0 1 1 0 1 0 1 0 1 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 0 0 0 0 0 0 0

1 0 0 0 0 0 1 1 1

1 0 1 0 0 0 1 1 0

1 0 0 0 0 0 1 1 1

1 0 0 0 0 0 1 1 0

1 0 0 0 0 0 1 1 1

1 1 0 0 1 0 1 0 1

1 0 0 0 0 0 1 1 1

1 0 0 1 0 0 1 0 0

1 0 0 0 0 0 1 1 1

1 0 0 0 1 1 1 0 1

1 0 0 0 0 0 1 1 1

1 1 0 1 0 0 1 0 1

1 0 0 0 0 0 1 1 1

1 0 1 0 0 0 1 0 0

1 0 0 0 0 0 1 1 1

1 0 0 0 0 1 1 1 0

1 0 0 0 0 0 1 1 1

1 0 0 1 0 0 0 0 0

1 0 0 0 0 0 1 1 1

CRC

1 0 0 1 1 1 0 0

X = don’t care

2-WIRE 16-BIT

2-WIRE 18-BIT

1-WIRE 16-BIT

1-WIRE 18-BIT

READ RESULT

READ REQUEST

WRITE

SDOA

SDOB

SDOA

SDI

SDOB

CRCREG X

CRCA,B

16 + 16 + 8 = 40 BITS

18 + 8 = 26 BITS

18 + 18 + 8 = 44 BITS

16 + 8 = 24 BITS

RESULT_A

RESULT_B

RESULT_A

RESULT_B

RESULT_A

RESULT_B

WRITE REGISTER X

Figure 46. CRC Operation

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