NXP Semiconductors
FXPS7115D4
Digital absolute pressure sensor, 40 kPa to 115 kPa
Table 98.ꢀLock and CRC Register bit definitions
Location
Bit
Address
$5F
Register
7
6
0
0
5
4
0
0
3
2
1
0
CRC_UF2
LOCK_UF2
0
CRC_UF2[3:0]
Factory Default
$AF
0
0
0
0
0
0
CRC_F_A
CRC_F_B
CRC_F_C
CRC_F_D
CRC_F_E
CRC_F_F
LOCK_F_A
REGA_BLOCKID[2:0]
CRC_F_A[3:0]
varies
Factory Default
$BF
1
0
0
0
1
0
0
0
1
0
1
1
0
0
LOCK_F_B
REGB_BLOCKID[2:0]
CRC_F_B[3:0]
varies
Factory Default
$CF
1
1
LOCK_F_C
REGC_BLOCKID[2:0]
CRC_F_C[3:0]
varies
Factory Default
$DF
1
1
LOCK_F_D
REGD_BLOCKID[2:0]
CRC_F_D[3:0]
varies
Factory Default
$EF
1
0
LOCK_F_E
REGE_BLOCKID[2:0]
CRC_F_E[3:0]
Factory Default
$FF
0
0
0
0
0
0
0
0
0
0
LOCK_F_F
0
REGF_BLOCKID[2:0]
0
CRC_F_F[3:0]
Factory Default
7.7.33 Reserved registers
A register read command to a reserved register or a register with reserved bits results in
a valid response. The data for reserved bits may be '0' or '1'.
A register write command to a reserved register or a register with reserved bits executes
and results in a valid response. The data for the reserved bits may be '0' or '1'. A write to
the reserved bits must always be '0' for normal device operation and performance.
7.7.34 Invalid register addresses
A register read command to a register address outside of the addresses listed in
Section 7.6 "User-accessible data array" results in a valid response. The data for the
registers will be '00h'.
A register write command to a register address outside of the addresses listed in
Section 7.6 "User-accessible data array" will not execute, but results in a valid response.
The data for the registers will be '00h'.
A register write command to a read-only register will not execute, but results in a valid
response. The data for the registers is the current content of the registers.
7.8 Read/write register array CRC verification
The writable registers (all registers with the exception of the DEVLOCK_WR register) are
verified by a continuous 4-bit CRC that is calculated on the entire array once ENDINIT is
set. The CRC verification uses a generator polynomial of g(x) = X4 + X3 + 1, with a seed
value = '0000'.
FXPS7115D4
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© NXP B.V. 2019. All rights reserved.
Product data sheet
Rev. 3 — 5 December 2019
53 / 72
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