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:

• ±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 typical 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, robust self-test diagnostic: Device motion or orientation does not impact the result.

Applications:

Automotive security and convenience

• Key fob motion wake-up