ADXL362BCCZ-RL7

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1. DESCRIPTION

The  ADXL362BCCZ-RL7 is an ultralow power, 3-axis MEMS accelerometer that consumes less than 2 μA at a 100 Hz output data rate (ODR) and 270 nA when in motion triggered wake-up mode. Unlike accelerometers that use power duty cycling to achieve low power consumption, the  ADXL362BCCZ-RL7 does not alias input signals by undersampling; it samples the full bandwidth of the sensor at all data rates. The  ADXL362BCCZ-RL7 always provides 12-bit output resolution; 8-bit formatted data is also provided for more efficient singlebyte transfers when a lower resolution is sufficient. Measurement ranges of ±2 g, ±4 g, and ±8 g are available, with a resolution of 1 mg/LSB on the ±2 g range. For applications where a noise level lower than the normal 550 μg/√Hz of the ADXL362-MI is desired, either of two lower noise modes (down to 175 μg/√Hz typical) can be selected at minimal increase in supply current. In addition to its ultralow power consumption, the  ADXL362BCCZ-RL7 has many features to enable true system level power reduction. It includes a deep multimode output, first in, first out (FIFO), a built in micropower temperature sensor, and several activity detection modes including adjustable threshold sleep and wake-up operation that can run as low as 270 nA at a 6 Hz (approximate) measurement rate. A pin output is provided to directly control an external switch when activity is detected, if desired. In addition, the ADXL362BCCZ-RL7 has provisions for external control of sampling time and/or an external clock. The  ADXL362BCCZ-RL7 operates on a wide 1.6 V to 3.5 V supply range, and can interface, if necessary, to a host operating on a separate, lower supply voltage. The ADXL362-MI is processed through a special, high reliability manufacturing flow involving additional process, test, and quality controls to meet a higher quality and reliability standard that gives more robustness to Class II medical devices and Class III medical devices. The  ADXL362BCCZ-RL7 is available in a 3 mm × 3.25 mm × 1.06 mm LGA package.

2. FEATURES

    1. Ultralow power

    2. Power can be derived from coin cell battery

        - 1.8 μA at 100 Hz ODR, 2.0 V supply

        - 3.0 μA at 400 Hz ODR, 2.0 V supply

        - 270 nA, motion activated, wake-up mode

        - 10 nA standby supply current, 2.0 V supply

    3. High resolution, sensitivity at XOUT, YOUT, ZOUT: 1 mg/LSB

    4. Built in features for system level power savings

    5. Adjustable threshold sleep/wake modes for motion activation

    6. Autonomous interrupt processing, without need for microcontroller intervention, to allow the rest of the system to be turned off completely

    7. Deep embedded FIFO minimizes host processor load

    8. Awake state output enables implementation of standalone, motion activated switch

    9. Low noise down to 175 μg/√Hz

  10. Wide operating voltage range: 1.6 V to 3.5 V

  11. Operates off 1.8 V to 3.3 V batteries

  12. Special, high reliability manufacturing flow

  13. Acceleration sample synchronization via external trigger 

  14. On-chip temperature sensor 

  15. SPI digital interface

  16. Measurement ranges selectable via SPI command

  17. Small and thin 3 mm × 3.25 mm × 1.06 mm package

3. APPLICATIONS

    1. Medical implantable

    2. Clinical and home healthcare devices

    3. Hearing aids

    4. Motion enabled power save switches and metering devices

    5. Wireless sensors