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ADXL362 bảng dữ liệu(PDF) 11 Page - Analog Devices |
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ADXL362 bảng dữ liệu(HTML) 11 Page - Analog Devices |
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11 / 40 page  Preliminary Technical Data ADXL362 Rev. PrB | Page 11 of 40 Absolute Inactivity, if the Inactivity threshold is set lower than 1 g, a device resting motionless does not detect Inactivity. With Referenced Inactivity, the same device under the same configuration does detect Inactivity. The Inactivity timer can be set to anywhere from 2.5 ms (1 sample at 400 Hz ODR) to almost 90 minutes (65535 samples at 12.5Hz ODR) of inactivity, This means the accelerometer can be configured such that it must be stationary for up to 90 minutes before putting its system to sleep. The wide range of timer settings means that in applications where power conservation is critical, the system can be put to sleep after very short periods of inactivity; and in applications where continuous operation is critical, the system will stay on for as long as any motion at all is present. Linking Activity and Inactivity Detection The activity and inactivity detection functions can be used concurrently and processed manually by a host processor, or they can be configured to interact in several ways: Default Mode : activity and inactivity detection are both enabled and all interrupts must be serviced by a host processor; that is, a processor must read each interrupt before it is cleared and can be used again. Linked Mode : Activity and Inactivity detection are linked to each other such that only one of the functions is enabled at any given time. Once activity is detected, the device is assumed to be moving or “awake” and stops looking for activity: inactivity is expected as the next event, so only Inactivity detection operates. When inactivity is detected, the device is assumed to be stationary or “asleep”. Now activity is expected as the next event, so only Activity detection operates. In this mode, each interrupt must be serviced by a host processor before the next is enabled. Loop Mode : motion detection operates as described in Linked Mode, but interrupts do not need to be serviced by a host processor. This configuration simplifies the implementation of commonly-used motion detection, and enhances power savings by reducing the amount of power used in bus communication. Autosleep : In Linked or Loop mode, enabling Autosleep will cause the device to autonomously enter Wake-Up Mode (see p. 8) when inactivity is detected, and re-enter Measurement Mode when activity is detected. Using The Awake Bit The Awake bit is a status bit that indicates whether the ADXL362 is “awake” or “asleep”. The device is “awake” when it has seen an Activity condition, and “asleep” when it has seen an Inactivity condition. The Awake signal can be mapped to the INT1 or INT2 pin, and can thus be used as a status output to connect or disconnect power to downstream circuitry based on the Awake status of the accelerometer. Used in conjunction with Loop Mode, this configuration implements a trivial, autonomous motion- activated switch as shown in Figure 15. If the turn-on time of downstream circuitry can be tolerated, this motion switch configuration can save significant system- level power by eliminating the standby current consumption of the rest of the application. This standby current can often exceed the full operating current of the ADXL362. FIFO The ADXL362 includes a deep 512-sample FIFO (first-in, first- out) buffer. The FIFO provides benefits primarily in two ways. First, appropriate use of the FIFO enables system-level power savings by enabling the host processor to sleep for extended periods of time while the accelerometer autonomously collects data. Alternatively, using the FIFO to collect data can unburden the host while it tends to other tasks. Second, the FIFO can be used in a Triggered mode to record all data leading up to an activity detection event, thereby providing context for the event. In the case of a system that identifies impact events, for example, the accelerometer can keep the entire system off while it stores acceleration data in its FIFO and look for an Activity event. When the impact event occurs, data that was collected prior to the event is frozen in the FIFO. The accelerometer can now wake the rest of the system and transfer this data to the host processor, thereby providing context for the impact event. In general, the more context available, the more intelligent decisions a system can make, so a deep FIFO is especially useful. The ADXL362 FIFO can store up to over 13 seconds of data, providing a clear picture of events prior to an Activity trigger. All FIFO modes of operation, as well as the structure of the FIFO and instructions for retrieving data from it, are described in further detail in the Applications Information FIFO section on page 31. COMMUNICATIONS SPI Instructions The ADXL362’s digital interface is implemented with system- level power savings in mind. The following features enhance power savings: • Burst reads and writes reduce the number of SPI communication cycles required to configure the part. • Concurrent operation of Activity and Inactivity detection enables “set it and forget it” operation. Linked and Loop Modes further reduce |
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