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