FXLS93421 datasheet(150/254 Pages) NXP

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NXP Semiconductors

FXLS9xxxx

Dual channel inertial sensor

time

VHIGH

VLOW

Disc_Compare

CmdBlock_DISC

tIDISC_Samp_Dly

ICCQ_SAMPLE

IRESP Activation

tDISC_Ramp_RSP

tDISC_Idle_RSP

tIDISC_Samp

tIDISC_CMD_BLK

tDISC_Dly

tDISC_ICCQ_Samp

tSTART_DISC_RSP

aaa-030650

Figure 67. DSI3 discovery mode sensing timing diagram

12.2 Address assignment

The device supports all three address assignment methods described in the DSI3[2]

standard as described in Section 12.2.1, Section 12.2.2, and Section 12.2.3.

12.2.1 Address assignment method for parallel connected slaves

Devices connected in parallel must have pre-programmed addresses by storing a

non-zero value into the PADDR[3:0] bits of the PHYSADDR OTP register. If a non-

zero value is stored in this OTP register, The device does not participate in any other

address assignment method and waits for Command and Response Mode for further

configuration. See Section 12.3 for details regarding Command and Response Mode.

12.2.2 Address assignment method for bus switch connected daisy chain devices

A device connected in daisy chain by a bus switch may have either a pre-programmed

address as described in Section 12.2.1, or an un-programmed address.

If the address is pre-programmed, the device does not participate in any other

address assignment method and waits for Command and Response Mode for further

configuration information, including activating the bus switch to connect the next device

on the bus. See Section 12.3 for details regarding Command and Response Mode.

If the address is un-programmed, once power is applied, the device is the only device

on the segment which requires an address assignment. The device will accept a

Command and Response Mode register write command addressed to Address $0 (global

command), which writes the PADDR[3:0] bits to a non-zero value. Once a physical

address is assigned to the device, Command and Response Mode is used with the

assigned physical address for further configuration.

On power up, the device bus switch output defaults to deactivated.

12.2.3 DSI3 discovery mode: Address assignment method for resistor connected

daisy chain devices

A device connected in daisy chain via a resistor has an un-programmed address and

uses Discovery Mode to obtain its physical address (PADDR[3:0]).

FXLS9xxxx

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

Product data sheet

Rev. 6 — 8 February 2021

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