FXLS8964AF datasheet(7/98 Pages) NXP

7 / 98 page

NXP Semiconductors

FXLS8964AF

3-Axis Low-g Accelerometer

FXLS8964AF

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Objective data sheet

Rev. 2 — 30 October 2020

7 / 98

Notes:

• The external trigger function can be used to trigger a single shot measurement of

the XYZ acceleration and temperature data. This mode is useful for synchronizing

measurements with an external system or for creating user-specific ODRs. The

measurement is triggered on the rising edge of the EXT_TRIG signal.

• Resistors R1 and R2 are not needed if the interrupt output driver type is configured for

push-pull operation (default). A suggested range for open-drain configuration is 10 kΩ

to 100 kΩ.

• If the INT1 pin, INT2 pin, or both pins are not used in the application, leave the unused

pin(s) unconnected.

• The SPI_CS_B pin also serves as a signal to wake the device from Hibernate mode.

• Refer to Section 11.2 and Section 11.4 for more details on 3-wire SPI mode.

Figure 7. Typical Application Circuit #5 – Motion detection mode (no serial interface)

Figure 8. Typical Application Circuit #6 - Motion detection mode (with SPI 3-wire interface, software enabled)

Notes:

• External resistor R2 is not needed if the BOOT_OUT and MOT_DET pins are tied

together (wired AND configuration).

• A suggested pull-up resistance range is 1 MΩ to 2.5 MΩ for both R1 and R2 to

minimize the power dissipated in the resistor when the line is pulsed low. When

BT_MODE is set to VDD (enabling motion detection mode), both the MOT_DET and

BOOT_OUT pins become open-drain output driver types. MOT_DET also functions as

a CMOS input and is used by the host system to power-manage FXLS8964AF.

• When BT_MODE = VDD, the default motion detection parameters are automatically

loaded into the device after a POR/BOR event occurs; no configuration via I2C or SPI is

needed if the default parameters are used in the application.

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