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MMA8652FC 数据表(PDF) 16 Page - NXP Semiconductors |
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MMA8652FC 数据表(HTML) 16 Page - NXP Semiconductors |
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16 / 65 page  MMA8652FC Sensors 16 Freescale Semiconductor, Inc. The Transient Detection function can be routed to either interrupt pin through bit 5 in CTRL_REG5 register (0x2E). Registers 0x1D – 0x20 are the dedicated Transient Detection configuration registers. The source register contains directional data to determine the direction of the acceleration (either positive or negative). 5.8 Tap detection The MMA8652FC has embedded single/double and directional tap detection. • The tap detection function has various customizing timers, for setting the pulse time width and the latency time between pulses. There are programmable thresholds for all three axes. • The tap detection can be configured to run through the high-pass filter and also through a low-pass filter, which provides more customizing and tunable tap detection schemes. • The status register provides updates on the axes where the event was detected and the direction of the tap. 5.9 Orientation detection The MMA8652FC incorporates an advanced orientation detection algorithm with the ability to detect all six orientations shown in Figure 6. The embedded algorithm uses configurable trip points, allowing the selection of the desired midpoint and hysteresis value (see Figure 7). Figure 6. Sensitive axes orientation Top View PORTRAIT UP Earth Gravity Pin 1 Xout @ 0 g Yout @ –1 g Zout @ 0 g Xout @ 1 g Yout @ 0 g Zout @ 0 g Xout @ 0 g Yout @ 1 g Zout @ 0 g Xout @ –1 g Yout @ 0 g Zout @ 0 g LANDSCAPE LEFT PORTRAIT DOWN LANDSCAPE RIGHT Side View FRONT Xout @ 0 g Yout @ 0 g Zout @ 1 g BACK Xout @ 0 g Yout @ 0 g Zout @ –1 g X Y Z Pin 1 (Top View) Direction of the Detectable Accelerations |
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