FXPS7115D4 datasheet(21/72 Pages) NXP

21 / 72 page

NXP Semiconductors

FXPS7115D4

Digital absolute pressure sensor, 40 kPa to 115 kPa

FXPS7115D4

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Product data sheet

Rev. 3 — 5 December 2019

21 / 72

7.5.3 Command summary

7.5.3.1 Register read command

The device supports a register read command. The register read command uses the

upper 7 bits of the addresses defined in Section 7.6 "User-accessible data array" to

address 8-bit registers in the register map.

The response to a register read command is shown in Section 7.5.3.1.2 "Register read

response message format". The response is transmitted on the next SPI message if and

only if all of the following conditions are met:

• No SPI error is detected (see Section 7.5.5.3 "SPI error" )

• No MISO error is detected (see Section 7.5.5.4 "SPI data output verification error")

If these conditions are met, the device responds to the register read request as shown

in Section 7.5.3.1.2 "Register read response message format". Otherwise, the device

responds with the error response as defined in Section 7.5.5.2 "Error responses". The

7.5.3.1.1 Register read command message format

Table 12. Register read command message format

MSB: bit 31; LSB: bit 0

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

15 14 13 12 11 10 9

Command

C[3:0]

Fixed bits:

must = 0h

8-bit CRC

RA[7:1]

RA[0]

CRC[7:0]

Table 13. Register read command message bit field descriptions

Bit field

Definition

C[3:0]

RA[7:0]

RA[7:1] contains the word address of the register to be read.

CRC[7:0]

Read CRC Section

7.5.3.1.2 Register read response message format

Table 14. Register read response message format

MSB: bit 31; LSB: bit 0

31 30 29 28

25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9

Command

C[0], [3:1]

Basic

Status

Unused

Data 0h

of RA[7:1] high byte

of RA[7:1] low byte

8-bit CRC

ST[1:0]

RD[15:8]

RD[7:0]

CRC[7:0]

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