TMP126 datasheet(23/48 Pages) TI

23 / 48 page

Peripheral controls SIO line

Controller controls SIO line

SIO

Command

Read Data

CRC

CRC determined by Command Word and Data Block

Figure 8-16. CRC Enabled Read

8.5.2.5.1 Cyclic Redundancy Check Implementation

Table 8-2 defines the CRC calculation rule.

Table 8-2. CRC Rule Table

Temperature

Digital Output

CRC Width

16 bits

Polynomial

X16 + X12 + X5 + 1 (1021h)

Initial seed value

FFFFh

Input data reflected

Result data reflected

XOR value

0000h

Example

CRC of 0xABCD = 0xD46A

Figure 8-17 shows the CRC Module block diagram. The CRC calculation is done on the command word and the

data block. The module consists of a 16-bit shift register and 3 exclusive-OR gates. The register starts with the

seed value FFFFh and the module performs an XOR function and shifts its content until the last bit of the register

string is used. The final value of the shift register checksum is output onto the SIO line by the TMP126-Q1 at the

end of the data block for the host to validate the transaction.

C15 C14 C13 C12

C11 C10 C9

MSB

LSB

XOR

Data Block

Figure 8-17. CRC Module

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TMP126-Q1

SNIS227C – MAY 2021 – REVISED JUNE 2022

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