FXLS93421 datasheet(147/254 Pages) NXP

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NXP Semiconductors

FXLS9xxxx

Dual channel inertial sensor

incremented by one. The counter rolls over to '00' after the maximum value specified in

the ARM_DS[1:0] bits is reached.

11.9.5 Arming pulse stretch function

A pulse stretch function can be applied to the arming outputs in moving average mode, or

count mode.

If the pulse stretch function is not used (ARM_PS[1:0] = '00'), the arming output is

asserted if and only if an arming condition exists for the associated channel after the

most recent evaluated sample. The arming output is deasserted if and only if an arming

condition does not exist for the associated channel after the most recent evaluated

sample.

If the pulse stretch function is used (ARM_PS[1:0] not equal '00'), the arming output is

controlled only by the value of the pulse stretch timer value. If the pulse stretch timer

value is non-zero, the arming output is asserted. If the pulse stretch timer is zero, the

arming output is deasserted. The pulse stretch counter continuously decrements until it

reaches zero. The pulse stretch counter is reset to the programmed pulse stretch value

if and only if an arming condition exists for the associated channel after the most recent

evaluated sample. See Figure 58.

Exception conditions listed in Section 14.5 do not impact prior arming function responses.

If an exception occurs after an arming activation, the corresponding pulse stretch for

the existing arming condition will continue. However, new sensor reads will not reset the

pulse stretch counter regardless of the sensor value.

11.9.6 Arming pin output structure

The arming output pin structure can be set to active high, or active low with the

ARM_CFG bits in the CHx_CFG_U4 registers as described in Section 11.2.26.4. The

active high and active low pin output structures are shown in Figure 61.

ARM FUNCTION

open drain, active high

open drain, active low

GATING

ARM

aaa-030644

VCC

ARM FUNCTION

GATING

VCC

Figure 61. Arming function - pin output structure

12 DSI3 protocol

The DSI3[2] standard describes two function classes: Signal Function Class and

Power Function Class. The device is a slave conforming to the Signal Function Class

requirements. The device does not support Power Function Class. The following sections

describe the DSI3 Signal Function Class features supported by the device.

FXLS9xxxx

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Product data sheet

Rev. 6 — 8 February 2021

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