1 General description
FXLS8961AF is a compact 3-axis MEMS accelerometer designed for use in a wide range of automotive
security and convenience applications that require ultra-low-power wake-up on motion as well as good
performance over temperature. The part supports both high-performance and low-power operating modes,
allowing maximum flexibility to meet the resolution and power needs for various unique use cases. A number
of advanced, integrated digital features enable designers to reduce the overall system power consumption and
simplify host data collection.
FXLS8961AF is available in a 3 mm x 3 mm x 1.25 mm 12-pin QFN package with 0.65 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-temperaturerange
performance makes FXLS8961AF an ideal accelerometer for automotive security and convenience
applications.
2 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: 230 μg/√Hz typical in high performance mode
• Low-power capability:
– ≤ 2 μA IDD for ODRs up to 6.25 Hz
– < 4 μA IDD for ODRs up to 50 Hz
• Post-board mount zero-g Offset and TCO performance of ±30 mg (typ) and ±0.25 mg/°C (typ), respectively
• Selectable ODRs from 0.78 to 3200 Hz in both low power and high performance modes
• Flexible performance mode allowing 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)
• Self-governed 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.
3 Applications
3.1 Automotive security and convenience
• Infotainment
• Telematics (T-Box)
• Car alarm
• Inclinometer
• Door checker
• SmartLock