FXLS93421 datasheet(181/254 Pages) NXP

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NXP Semiconductors

FXLS9xxxx

Dual channel inertial sensor

aaa-030674

external

PSI5 initialization

phase 1

tPSI5Delay_Before_MasterSync_Pulses

tPSI5_INIT1

sync. pulses ignored

offset cancellation LPF init

tPSI5ST_START

self test

tST

sync

pulses

ignored

tRS_PM

entry

programming

mode

self test

repeat

(if necessary)

ST_RPT * tST

PSI5 initialization

phase 2

tPSI5_INIT2

PSI5 initialization

phase 3

tPSI5_INIT3

PSI5

normal mode

programming mode entry

1) Min. 31 sync pulses

2) PME command

otherwise

sync pulses ignored

tPME

Figure 89. PSI5 initialization timing, synchronous mode

aaa-030675

offset cancellation LPF init

tPSI5ST_START

self test

tST

sync

pulses

ignored

tRS_PM

entry

programming

mode

self test

repeat

(if necessary)

ST_RPT * tST

PSI5 initialization

phase 2

tPSI5_INIT2

tASYNC

PSI5 initialization

phase 1

tPSI5_INIT1

PSI5 initialization

phase 3

tPSI5_INIT3

PSI5

normal mode

programming mode entry

1) Min. 31 sync pulses

2) PME command

otherwise

sync pulses ignored

tPME

Figure 90. PSI5 initialization timing, asynchronous mode

13.4.1 PSI5 initialization phase 1

During PSI5 initialization phase 1, the device begins internal initialization and self-checks,

but transmits no data. Initialization begins with this sequence, shown in Figure 89:

1. Internal delay to ensure analog circuitry has stabilized (tPOR_PSI5)

2. Offset cancellation low-pass filter initialization begins (tPSI5ST_START)

3. Monitor for the Programming Mode Entry Sequence (tPME)

4. If the Programming Mode Entry Sequence is not detected, the device enters

Initialization Phase 2 (tPSI5_INIT2)

13.4.2 PSI5 initialization phase 2

During PSI5 initialization phase 2, the device continues its internal selfchecks and

transmits the PSI5 initialization phase 2 data. Initialization data is transmitted using

the initialization data codes and IDs specified in Table 264, and in the order shown in

Table 265.

FXLS9xxxx

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Product data sheet

Rev. 6 — 8 February 2021

181 / 254

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