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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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FXLS8971CF датащи(PDF) 81 Page - NXP Semiconductors |
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FXLS8971CF датащи(HTML) 81 Page - NXP Semiconductors |
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81 / 100 page  NXP Semiconductors FXLS8971CF 3-Axis Low-g Accelerometer • The external trigger function can be used to trigger a single shot measurement of the XYZ acceleration and temperature data. This mode is useful for synchronizing measurements with an external system or for creating user-specific ODRs. The measurement is triggered on the rising edge of the EXT_TRIG signal. • Resistors R1 and R2 are not needed if the interrupt output driver type is configured for push-pull operation (default). A suggested range for open-drain configuration is 10 kΩ to 100 kΩ. • If the INT1 pin, INT2 pin, or both pins are not used in the application, leave the unused pins unconnected. • The SPI_CS_B pin also serves as a signal to wake the device from Hibernate mode. • See Section 13.2 and Section 13.4 for more details on 3-wire SPI mode. C1 0.1 µF R1 R2 (optional) (optional) 1 2 3 4 5 10 9 7 8 6 VDD VDD VDD BT_MODE GND INTF_SEL SPI_CS_B/WAKE_UP INT1/MOT_DET INT2/EXT_TRIG/BOOT_OUT MOT_DET BOOT_OUT SA0/SPI_MISO SDA/SPI_MOSI/SPI_DATA SCL/SCLK C2 1.0 µF aaa-053944 11 12 n.c. n.c. Figure 26. Typical Application Circuit #5 – Motion detection mode (no serial interface) aaa-053945 C1 0.1 µF R1 R2 (optional) (optional) 1 2 3 4 5 10 11 12 9 7 8 6 VDD VDD VDD BT_MODE GND INTF_SEL INT1/MOT_DET SPI_CS_B/WAKE_UP INT2/EXT_TRIG/BOOT_OUT MOT_DET SPI_CS_B/WAKE_UP BOOT_OUT DNC SDA/SPI_MOSI/SPI_DATA SCL/SCLK SPI_DATA SCLK C2 1.0 µF n.c. n.c. Figure 27. Typical Application Circuit #6 - Motion detection mode (with SPI 3-wire interface, software enabled) Notes: • External resistor R2 is not needed if the BOOT_OUT and MOT_DET pins are tied together (wired AND configuration). • A suggested pull-up resistance range is 1 MΩ to 2.5 MΩ for both R1 and R2 to minimize the power dissipated in the resistor when the line is pulsed low. When BT_MODE is set to VDD (enabling motion detection mode), both the MOT_DET and BOOT_OUT pins become open-drain output driver types. MOT_DET also functions as a CMOS input and is used by the host system to power-manage FXLS8971CF. • When BT_MODE = VDD, the default motion detection parameters are automatically loaded into the device after a POR/BOR event occurs; no configuration via I2C or SPI is needed if the default parameters are used in the application. • See Section 13.2 and Section 13.4 for more details on 3-wire SPI mode. In motion detection mode with BT_MODE=VDD, use of HPM or FPM mode is not advised. Only the default LPM mode should be used. FXLS8971CF All information provided in this document is subject to legal disclaimers. © 2024 NXP B.V. All rights reserved. Product data sheet Rev. 2.1 — 7 March 2024 81 / 100 |
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