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General description

FXLS8964AF is a compact 3-axis MEMS accelerometer designed for use in automotive

remote keyless entry (key fob) applications that require ultra-low-power wake-up on

motion. The part supports both high-performance and low-power operating modes,

allowing maximum flexibility to meet the resolution and power needs for various use case

implementations. A number of advanced, integrated digital features enable designers to

reduce the overall system power consumption and simplify host data collection.

FXLS8964AF is available in a 2 mm x 2 mm x 0.95 mm 10-pin DFN package with 0.4 mm

pitch and wettable flanks. The device is qualified to AEC-Q100 and operates over the

extended –40 °C to +105 °C temperature range. The combination of sensor performance,

system power-saving features, and extended over-temperature-range performance

makes FXLS8964AF an ideal accelerometer for automotive security and convenience

applications.

Features and benefits

? ±2/4/8/16 g user-selectable, full-scale measurement ranges

? 12-bit acceleration data

? 8-bit temperature sensor data

? Low noise: 280 μg/√Hz in high performance mode

? Low-power capability:

– ≤ 1 μA IDD for ODRs up to 6.25 Hz

– < 4 μA IDD for ODRs up to 50 Hz

? Selectable ODRs up to 3200 Hz; Flexible Performance mode allows for custom ODRs

with programmable decimation (resolution) and idle-time settings

? 144 byte output data buffer (FIFO/LIFO) capable of storing up to 32 12-bit X/Y/Z data

triplets

? Flexible Sensor Data Change Detection (SDCD) function for realizing motion or no

motion, high-g/low-g, freefall, and other inertial events

? Autonomous orientation detection function (Portrait/Landscape/Up/Down)

? Dedicated low-power motion-detection mode with one wire interface option

? 12-bit vector magnitude calculation

? Trigger input for synchronizing data collection with an external system

? I2C interface frequencies up to 1 MHz; 3- and 4-wire SPI interface with clock

frequencies up to 4 MHz

? Bidirectional self-test diagnostic: Device motion or orientation does not impact the result.

Applications

3.1 Automotive security and convenience

? Key fob motion wake-up