FS23 datasheet(100/230 Pages) NXP

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NXP Semiconductors

FS23

Safety system basis chip (SBC) with power management, CAN FD and LIN transceivers

An 8-bit CRC is required for each write and read I2C command. Computation of a CRC is derived from the

mathematics of polynomial division, modulo two. The CRC polynomial used is x^8+x^4+x^3+x^2+1 defined by

SAE-J1850 (identified by 0x1D) with a SEED value of hexadecimal '0xFF'.

20.1.2 Device address

The I2C address has the following arrangement:

• Bit 39: 0

• Bit 38: 1

• Bit 37 to 34: OTP value

• Bit 33: 0

B39

B38

B37

B36

B35

B34

B33

I2CDEVADDR_OTP[3:0]

Table 64. Device address

20.1.3 I2C CRC calculation and results

CRC calculation using XOR:

CRC_7 = XOR ( B38, B35, B32, B31, B24, B23, B22, B20, B17, B13, B12, B11, 1, 1, 1)

CRC_6 = XOR ( B37, B34, B23, B22, B21, B19, B16, B12, B11, B10, 1, 1)

CRC_5 = XOR ( B39, B36, B33, B30, B29, B22, B21, B20, B18, B15, B11, B10, B9, 1, 1, 1)

CRC_4 = XOR ( B39, B38, B35, B32, B29, B28, B21, B20, B19, B17, B14, B10, B9, B8, 1, 1, 1, 1)

CRC_3 = XOR ( B37, B35, B34, B32, B28, B27, B24, B23, B22, B19, B18, B17, B16, B12, B11, B9, B8, 1, 1, 1,

CRC_2 = XOR ( B39, B38, B36, B35, B34, B33, B32, B27, B26, B24, B21, B20, B18, B16, B15, B13, B12, B10,

B8, 1, 1, 1, 1, 1, 1, 1)

CRC_1 = XOR ( B37, B34, B33, B26, B25, B24, B22, B19, B15, B14, B13, B9, 1, 1, 1)

CRC_0 = XOR ( B39, B36, B33, B32, B25, B24, B23, B21, B18, B14, B13, B12, B8, 1, 1, 1, 1)

Device address + R/W

0b0 + Register

address

Data

8-bit CRC

0 1 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0xAC

0x41

0x02

0x0000

0xAC

0 1 0 0 0 1 0 0 0 1 1 1 1 1 1 1 1 1 0 1 0 0 0 0 0 0 0 0 0 0 0 1

0x38

0x44

0x7F

0xD001

0x38

Table 65. CRC result examples

FS23

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Product data sheet

Rev. 7.0 — 16 October 2024

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