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1 General description

FXLS8971CF is a compact 3-axis MEMS accelerometer designed for use in a wide range of industrial and

medical IOT 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.

FXLS8971CF 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 industrial standards 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 FXLS8971CF an ideal accelerometer for motion and position sensing in the IOT and

industrial segments.

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:

– ≤ 1 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 ±0.15 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.