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FXLS8964AF 数据表(PDF) 8 Page - NXP Semiconductors |
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FXLS8964AF 数据表(HTML) 8 Page - NXP Semiconductors |
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8 / 98 page  NXP Semiconductors FXLS8964AF 3-Axis Low-g Accelerometer FXLS8964AF All information provided in this document is subject to legal disclaimers. © NXP B.V. 2020. All rights reserved. Objective data sheet Rev. 2 — 30 October 2020 8 / 98 • Refer to Section 11.2 and Section 11.4 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. 7.2 Power supply considerations It is recommended that VDD be sourced from a low noise linear supply regulator (LDO). When using a switch mode supply, the recommended minimum voltage is 1.8 V (nominal), providing headroom for supply noise and ripple rejection. This headroom ensures that the device will meet its performance specifications while also preventing a BOR/POR event from occurring when operated on a noisy supply rail. FXLS8964AF contains a POR generator. This circuit resets the digital logic and restores all register content to the default values shown in Table 19 following the application of VDD ≥ 1.71 V, or after a soft reset command is issued by setting SENS_CONFIG1[RST] = 1. Note that the host system must wait for a nominal time period of TBOOT1/2 ms after applying VDD ≥ 1.71 V, or after issuing a soft reset command, to allow enough time for FXLS8964AF to complete its internal boot sequence and be ready for communication over the I2C or SPI interfaces. When the BT_MODE pin is low, with INT_EN[BOOT_DIS] = 0, the host system can wait until the active edge of a TPULSE-BOOT1 µs pulse is observed on the INTx pin (determined by INT_PIN_SEL[BOOT_INT2]) indicating completion of the boot sequence. When the BT_MODE pin is logic high, the INT2 pin is configured as an open drain output (BOOT_OUT) that pulses low for TPULSE-BOOT2 ms after the boot sequence completes. 8 Sensing direction and output response aaa-028907 X Y Z Xout @ - 1 g Yout @ 0 g Zout @ 0 g Xout @ 1 g Yout @ 0 g Zout @ 0 g (Top view) Reference frame for acceleration measurement Xout @ 0 g Yout @ 1 g Zout @ 0 g Xout @ 0 g Yout @ - 1 g Zout @ 0 g Xout @ 0 g Yout @ 0 g Zout @ 1 g Xout @ 0 g Yout @ 0 g Zout @ - 1 g Pin 1 Portrait up Side view Back view Front view Top view Portrait down Landscape left Landscape right Gravity Figure 9. Sensitive axes orientation and output response to ±1 g (gravity) stimulus |
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