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FXLS93421 Datasheet(PDF) 207 Page - NXP Semiconductors

Part # FXLS93421
Description  Dual channel inertial sensor
PDF  254 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

FXLS93421 Datasheet(HTML) 207 Page - NXP Semiconductors

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NXP Semiconductors
FXLS9xxxx
Dual channel inertial sensor
14.4.2 Selectable 4-bit CRC
The user can select a 4-bit CRC instead of the default 8-bit CRC for the SPI by
programming the SPI_CFG register as described in Section 11.2.20.
14.4.2.1 SPI command format with 4-bit CRC
MSB
LSB
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Register Access Command
Command
Fixed Bits:
Must = 0x0
Register Address
Register Data
Fixed Bits:
Must = 0x0
4-bit CRC
C[3:0]
0
0
0
0
RA[7:1]
RA[0]
RD[7:0]
0
0
0
0
CRC[3:0]
Sensor Data Command
Command
Fixed Bits: Must = 0x00000
Fixed Bits:
Must = 0x0
4-bit CRC
C[3:0]
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
CRC[3:0]
Table 322. SPI command format with 4-bit CRC
14.4.2.2 SPI response format with 4-bit CRC
MSB
LSB
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Response to Register Request
Command
Basic
Status
Unused
Data
= 0x0
Register Data: Contents
of RA[7:1] High Byte
Register Data: Contents
of RA[7:1] Low Byte
Unused Data = 0x0
4-bit CRC
C[0] C[3] C[2] C[1] ST[1:0]
0
0
RD[15:8]
RD[7:0]
0
0
0
0
CRC[3:0]
Response to Sensor Data Request
Command
Basic
Status
Sensor Data
Detail
Status
KAC
4-bit CRC
C[0] C[3] C[2] C[1] ST[1:0]
SD[11:0]
Optional SD
resolution
SF[1:0]
KAC[3:0]
CRC[3:0]
Error Response to Register Request
Command
Basic
Status
Unused
Data
= 0x0
Register Data: Contents
of RA[7:1] High Byte
Register Data: Contents
of RA[7:1] Low Byte
Unused Data = 0x0
4-bit CRC
0
0
0
0
1
1
0
0
RD[15:8]
RD[7:0]
0
0
0
0
CRC[3:0]
Error Response to Sensor Data Request With Sensor Data
Command
Basic
Status
Sensor Data
Detail
Status
KAC
4-bit CRC
C[0] C[3] C[2] C[1]
1
1
SD[11:0]
Optional SD
resolution
SF[1:0]
KAC[3:0]
CRC[3:0]
Error Response to Sensor Data Request Without Sensor Data
Command
Basic
Status
x
Unused Data = 0x0000
Detail
Status
Unused Data = 0x0
4-bit CRC
0
0
0
0
1
1
x
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
SF[1:0]
0
0
0
0
CRC[3:0]
Table 323. SPI response format with 4-bit CRC
14.4.2.3 Command error checking with 4-bit CRC
The device calculates a 4-bit CRC on the entire 32-bits of each command. Message data
is entered into the CRC calculator MSB first, consistent with the transmission order of the
message. If the calculated CRC does not match the transmitted CRC, the command is
ignored and the device responds with the SPI Error response.
The CRC decoding procedure is:
FXLS9xxxx
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2021. All rights reserved.
Product data sheet
Rev. 6 — 8 February 2021
207 / 254



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