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FXLS8971CF Datasheet(PDF) 22 Page - NXP Semiconductors |
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FXLS8971CF Datasheet(HTML) 22 Page - NXP Semiconductors |
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22 / 100 page  NXP Semiconductors FXLS8971CF 3-Axis Low-g Accelerometer aaa-040844 tHCS tSCLKL tSCLKH tSCLK tSCS tSET tHOLD tWCS SPI_CS_B SCLK SPI_MOSI SPI_MISO tDDLY tHZ High-Impedance High-Impedance Figure 15. SPI timing diagram (4-wire mode) 13.6 SPI timing specifications (software enabled 3-wire mode) Table 14 and Figure 16 specify and illustrate the minimum and maximum timing parameter values for correct SPI interface functionality when FXLS8971CF is operated in 3-wire (software enabled) SPI mode. FXLS8971CF only supports SPI mode '00', corresponding to CPOL = 0, and CPHA = 0. In this mode, the active state of the clock is high and the idle state is low. Data is latched on the rising edge of the clock and propagated on the falling edge. All timing specifications shown in Table 14 were determined under the following conditions: 10 pF capacitor and 1 kΩ pull-up resistor present on all SPI signals, 105 °C, 1.8 V. Note: When FXLS8971CF is operated in 3-wire SPI mode - by setting SENS_CONFIG1[SPI_M] = 1 - the SA0/SPI_MISO pin is always placed in a high impedance (high-z) state, with the SPI_MISO pin output driver disabled (tri-stated). Specifications Label Description Min. Max. Unit fSCLK SCLK frequency 0 4 MHz tSCLK SCLK Period 250 — ns tSCLKH SCLK high time 100 — ns tSCLKL SCLK low time 100 — ns tSCS Setup time for SPI_CS_B signal 125 — ns tHCS Hold time for SPI_CS_B signal 240 — ns tHZ Hold time for SPI_DATA signal transition back to high-impedance state — 25 ns tWCS Inactive time for SPI_CS_B signal 600 — ns tSET Data setup time for SPI_DATA signal 10 — ns tHOLD Data hold time for SPI_DATA signal 10 — ns tDDLY Data setup time for SPI_DATA signal (output phase) — 50 ns Table 14. Secondary timing values 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 22 / 100 |
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