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MMA8453QR1 Datasheet(PDF) 10 Page - Freescale Semiconductor, Inc |
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MMA8453QR1 Datasheet(HTML) 10 Page - Freescale Semiconductor, Inc |
10 / 47 page MMA8453Q Sensors 10 Freescale Semiconductor, Inc. 4 Modes of Operation Figure 6. MMA8453Q Mode Transition Diagram All register contents are preserved when transitioning from ACTIVE to STANDBY mode. Some registers are reset when transitioning from STANDBY to ACTIVE. These are all noted in the device memory map register table. The SLEEP and WAKE modes are ACTIVE modes. For more information on how to use the SLEEP and WAKE modes and how to transition between these modes, please refer to the functionality section of this document. 5 Functionality The MMA8453Q is a low-power, digital output 3-axis linear accelerometer with a I 2C interface and embedded logic used to detect events and notify an external microprocessor over interrupt lines. The functionality includes the following: • 8-bit or 10-bit data • Four different oversampling options for compromising between resolution and current consumption based on application requirements • Additional Low Noise mode that functions independently of the Oversampling modes for higher resolution • Low Power and Auto-WAKE/SLEEP modes for conservation of current consumption • Single/Double tap with directional information 1 channel • Motion detection with directional information or Freefall 1 channel • Transient/Jolt detection based on a high pass filter and settable threshold for detecting the change in acceleration above a threshold with directional information 1 channel • Portrait/Landscape detection with trip points fixed at 30° and 60° for smooth transitions between orientations. All functionality is available in 2g, 4g or 8g dynamic ranges. There are many configuration settings for enabling all the different functions. Separate application notes have been provided to help configure the device for each embedded functionality. Table 7. Mode of Operation Description Mode I2C Bus State VDD VDDIO Function Description OFF Powered Down <1.8V VDDIO Can be > VDD The device is powered off. All analog and digital blocks are shutdown. I2C bus inhibited. STANDBY I2C communication with MMA8453Q is possible ON VDDIO = High VDD = High ACTIVE bit is cleared Only digital blocks are enabled. Analog subsystem is disabled. Internal clocks disabled. ACTIVE (WAKE/SLEEP) I2C communication with MMA8453Q is possible ON VDDIO = High VDD = High ACTIVE bit is set All blocks are enabled (digital, analog). Table 8. Features of the MMA845xQ devices Feature List MMA8451 MMA8452 MMA8453 SLEEP WAKE STANDBY OFF ACTIVE |
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