FXLS93421 datasheet(163/254 Pages) NXP

163 / 254 page

NXP Semiconductors

FXLS9xxxx

Dual channel inertial sensor

12.4.1.1 Bit encoding

The Command Bit encoding for Periodic Data Collection Mode and Background

Diagnostic Mode is the same as the bit encoding for Command and Response Mode, as

described in Section 12.3.1.1.

12.4.1.2 Command message format

The command message format for Periodic Data Collection Mode and Background

Diagnostic Mode is the same as the command message format for Command and

Response Mode, as described in Section 12.3.1.2.

If Background Diagnostic Mode is disabled, then the device responds with the Periodic

Data Collection Mode response only if the command is the single bit Broadcast Read

Command. A Broadcast Read Command may be either a '1' or a '0'. Figure 74 shows the

Broadcast Read Commands supported by the device.

BRC 0

BRC 1

VHIGH

VLOW

aaa-030658

Figure 74. Background diagnostic mode command bit encoding

If Background Diagnostic Mode is enabled:

• Background Diagnostic Mode commands are transmitted and decoded in 2- or 4-bit

fragments depending on the state of the BDM_FRAGSIZE bit in the TIMING_CFG2

• The device responds with the Periodic Data Collection Mode response if and only if the

command is a Broadcast Read Command or a command fragment.

• A Broadcast Read Command or any command length other than 2 or 4 bits resets the

Background Diagnostic Mode command decode.

• The device responds with a Background Diagnostic Mode response only when a full

32-bit command is received and the decoded command is a valid Command and

Response Mode command.

See Section 12.4.4 for additional details on Background Diagnostic Mode timing.

12.4.1.3 Error checking

The error checking for Background Diagnostic Mode commands is the same as the error

checking for Command and Response Mode, and described in Section 12.3.1.3.

No error checking is employed for the Broadcast Read Commands.

12.4.2 DSI3 periodic data collection mode response transmission

When periodic data collection mode is enabled and the device receives either a

broadcast read or background diagnostic command, the device will respond with periodic

data as shown in Figure 75 and described in the following sections.

FXLS9xxxx

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

Product data sheet

Rev. 6 — 8 February 2021

163 / 254

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