FXLS93421 datasheet(109/254 Pages) NXP

109 / 254 page

NXP Semiconductors

FXLS9xxxx

Dual channel inertial sensor

• PSI5

– If any supply falls below the specified threshold, all PSI5 transmissions are

terminated for the present sync pulse or asynchronous transmission cycle. Once the

supply returns above the threshold, the device will resume responses as specified in

Section 11.2.2.5.

• SPI

– If any supply falls below the specified threshold, SPI responses are terminated. Once

the supply returns above the threshold, the device will resume command decode and

response transmissions as specified in Section 11.2.2.5.

• I2C

– If any supply falls below the specified threshold, I2C transactions are terminated.

Once the supply returns above the threshold, the device will resume responses as

specified in Section 11.2.2.5.

See Figure 15 for an example of a supply line interruption during a DSI3 or PSI5

response.

aaa-030609

time

BUS_I

BUS_I micro-cut occurs

response terminated

BUS_I undervoltage detected

POR

IBUS_I

VREGA

VREG

VBUF

Figure 15. BUS_I micro-cut response (DSI3 or PSI5)

11.5 Internal oscillator

The device includes a factory trimmed oscillator as specified in Section 10.20.

11.5.1 Oscillator training

The device includes a feature to train the oscillator to a tighter accuracy than the factory

trimmed capability assuming the system master has a tighter oscillator accuracy than the

slave factory trimmed capability. This feature can be enabled for all modes: DSI3, PSI5,

SPI, and I2C.

Note: Do not use oscillator training in systems that employ spread spectrum

communication methods to reduce emissions.

FXLS9xxxx

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

Product data sheet

Rev. 6 — 8 February 2021

109 / 254

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