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ADXL346BCCZ-RL7 Arkusz danych(PDF) 24 Page - Analog Devices |
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ADXL346BCCZ-RL7 Arkusz danych(HTML) 24 Page - Analog Devices |
24 / 32 page ADXL346 Preliminary Technical Data Rev. PrC | Page 24 of 32 the interrupt. Disabling an axis from participation clears the corresponding source bit when the next single tap/double tap event occurs. Register 0x3B—ORIENT_CONF (Read/Write) D7 D6 D5 D4 D3 D2 D1 D0 INT_ ORIENT Dead zone INT_ 3D Divisor INT_ORIENT Bit Setting the INT_ORIENT bit enables the orientation interrupt. A value of 1 overrides the overrun function of the device and replaces overrun in the INT_MAP, INT_ENABLE, and INT_ SOURCE registers with the orientation function. After setting the INT_ORIENT bit, the orientation bit in the INT_MAP and INT_ENABLE registers must be configured to map the orientation interrupt to INT1 or INT2 and to enable generation of the interrupt to the pin. The orientation interrupt is cleared by reading the INT_SOURCE register. Additionally, writing to the BW_RATE register, clearing the INT_ORIENT bit, or placing the part into standby mode clears the orientation interrupt. A value of 0 for the INT_ORIENT bit disables generation of the orientation interrupt and permits the use of the overrun function. Dead Zone Bits These bits determine the region between two adjacent orientations, where the orientation is considered invalid and is not updated. A value of 0 may result in undesirable behavior when the orientation is close to the bisector between two adjacent regions. The dead zone angle is determined by these bits, as described in Table 22. See the Orientation Sensing section for more details. Table 22. Dead Zone and Divisor Codes Dead Zone Angle (Degrees) Decimal Binary 2-D 3-D Divisor 0 000 3.3 2.5 2 1 001 5.8 6.3 4 2 010 8.2 9.8 8 3 011 10.3 13.0 16 4 100 12.3 16.0 32 5 101 14.1 18.6 64 6 110 15.6 20.9 128 7 111 17.0 23.0 256 INT_3D If the orientation interrupt is enabled, the INT_3D bit determines whether 2-D or 3-D orientation detection generates an interrupt. A value of 0 generates an interrupt only if the 2-D orientation changes from a valid 2-D orientation to a different valid 2-D orientation. A value of 1 generates an interrupt only if the 3-D orientation changes from a valid 3-D orientation to a different valid 3-D orientation. Divisor Bits These bits set the depth of the filter used to low-pass filter the measured acceleration for stable orientation sensing. The divisor length is determined by these bits, as detailed in Table 22. See the Orientation Sensing section for more details. Register 0x3C—Orient (Read Only) D7 D6 D5 D4 D3 D2 D1 D0 0 V2 2D_ORIENT V3 3D_ORIENT Vx Bits These bits show the validity of the 2-D (V2) and 3-D (V3) orien- tations. A value of 1 corresponds to the orientation being valid. A value of 0 means that the orientation is invalid because the current orientation is in the dead zone. xD_ORIENT Bits These bits represent the current 2-D (2D_ORIENT) and 3-D (3D_ORIENT) orientations of the accelerometer. If the orien- tation interrupt is enabled, this register is read to determine the orientation of the device when the interrupt occurs. Because this register updates with each new samples of acceleration data, it should be read at the time of the orientation interrupt to ensure that the orientation change that caused the interrupt is obtained. Orientation values are shown in Table 23 and Table 24. See the Orientation Sensing section for more details Changing the value in the BW_RATE register causes the orien- tation sensing filter to be cleared and the function to reset. Table 23. 2-D Orientation Codes Decimal Binary Orientation Dominant Axis 0 00 Portrait positive +X 1 01 Portrait negative −X 2 10 Landscape positive +Y 3 11 Landscape negative −Y Table 24. 3-D Orientation Codes Decimal Binary Orientation Dominant Axis 3 011 Front +X 4 100 Back −X 2 010 Left +Y 5 101 Right −Y 1 001 Top +Z 6 110 Bottom −Z |
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