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FXLS93421 Datasheet(PDF) 145 Page - NXP Semiconductors |
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FXLS93421 Datasheet(HTML) 145 Page - NXP Semiconductors |
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145 / 254 page  NXP Semiconductors FXLS9xxxx Dual channel inertial sensor 11.9.2 Arming function: count mode In count mode, the arming function compares each offset canceled sample against positive and negative thresholds that are individually programmed for each channel via the CHx_ARMT_x_x and CHx_ARMT_x_x registers. See Section 11.2.29 for register details. If the sample equals or exceeds either threshold, a sample counter is incremented. If the sample does not exceed either threshold, the sample counter is reset to zero. The sample rate for each channel is determined by the SPI sensor data sample rate. At the falling edge of SS_B for a sensor data SPI response for SOURCEID_0 (channel 0) or SOURCEID_2 (channel 1), a new sample for the associated channel is compared against the thresholds. See Figure 57. The arming function input data rate can be down sampled as described in Section 11.9.4. The SPI sensor data sample rate must meet the minimum time between requests (tACC_REQ_x) specified in Section 10.13. A sample count limit is programmable via the ARM_WS[1:0] bits in the CHx_ARM_CFG registers. If the sample count reaches the programmable sample count limit, an arming condition is indicated, the associated arm pin output is asserted, and the pulse stretch counter is set as described in Section 11.9.5. The associated arm pin output is deasserted only when the pulse stretch counter expires. Figure 58 shows the arming output operation for different SPI conditions. aaa-030640 SAMPLE COUNTER PULSE STRETCH GATING ARM ARM_T_P[7:0] ARM_WS_P[1:0] OC_out[12:3] ARM_T_N[7:0] I/O ARM_PS[1:0] Figure 57. Arming function block diagram - count mode aaa-030641 request SnsData SCLK ARM pulse stretch time tARM data latched for arm function and SPI MISO MOSI SS_B SnsData resp arming condition not present request SnsData SnsData resp request SnsData SnsData resp request SnsData SnsData resp arming condition not present arming condition not present arming condition present Figure 58. Arming condition, moving average and count mode FXLS9xxxx All information provided in this document is subject to legal disclaimers. © NXP B.V. 2021. All rights reserved. Product data sheet Rev. 6 — 8 February 2021 145 / 254 |
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