FXPS7115D4 datasheet(40/72 Pages) NXP

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NXP Semiconductors

FXPS7115D4

Digital absolute pressure sensor, 40 kPa to 115 kPa

FXPS7115D4

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 3 — 5 December 2019

40 / 72

7.7.9.2 SPI CRC Length and Seed Bits

The SPI_CRC_LEN[1:0] bits select the CRC length for SPI Mode as shown in the table

below. The SPI CRC seed bits contain the seed used for the SPI Mode. The default SPI

CRC is an 8-bit. When the SPI_CRC_LEN[1:0] bits are set to a non-zero value using

a Register Write command, the SPI CRC changes as defined in the table. The new

polynomial value is enabled for both MISO and MOSI on the next SPI Mode command.

The default seed (SPICRCSEED[3:0] = 0h) is FFh for an 8-bit CRC. When the value

is changed to a non-zero value using a Register Write command, the SPI CRC seed

changes to the value programmed as shown in the table. The new seed value is enabled

for both MISO and MOSI on the next SPI Mode command.

Table 57. SPI CRC Definition

SPI_CRC_LEN[1:0]

SPICRCSEED

CRC Polynomial

CRC Seed

x8 + x5 + x3 + x2 + x + 1

1111, 1111

non-zero

x8 + x5 + x3 + x2 + x + 1

0000, SPICRCSEED[3:0]

x4 + 1

1010

non-zero

x4 + 1

SPICRCSEED[3:0]

x3 + x + 1

111

non-zero

x3 + x + 1

SPICRCSEED[2:0]

x3 + x + 1

111

non-zero

x3 + x + 1

SPICRCSEED[2:0]

7.7.10 WHO_AM_I - who am I register (address 3Eh)

The WHO_AM_I register is a user programmed read/write register that contains the

unique product identifier. This register is included in the read/write array error detection.

Table 58. WHO_AM_I - device identification register (address 3Eh) bit allocation

Bit

Symbol

WHO_AM_I[7:0]

Factory default (stored value)

Factory default (read value)

Access

R/W

The default register value is 00h. If the register value is 00h, a value of C4h is transmitted

in response to a read command. For all other register values, the actual register value is

transmitted in response to a read command.

Table 59. WHO_AM_I register values

WHO_AM_I register value (hex)

Response to a register read command

00h

C4h

01h to FFh

Actual register value

7.7.11 I2C_ADDRESS - I2C slave address register (address 3Fh)

The I2C slave address register is a user programmed read/write register that contains the

unique I2C slave address. The register is readable in all modes. This register is included

in the read/write array error detection.

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