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FXLS93421 Datasheet(PDF) 151 Page - NXP Semiconductors |
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FXLS93421 Datasheet(HTML) 151 Page - NXP Semiconductors |
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151 / 254 page  NXP Semiconductors FXLS9xxxx Dual channel inertial sensor The master device must initiate Discovery Mode automatically after power is applied to the bus segment by sending a sequence of Discovery Commands. Discovery mode timing is defined in Section 10.11. If the ENDINIT bit is not set and the PADDR[3:0] field is set to '0000', the device will detect a Discovery Command tSTART_DISC after a power-on reset and for intervals of tPER_Disc until Discovery Mode has ended (the maximum value of tSTART_DISC). Discovery Mode follows the sequence listed here. Figure 68 shows a timing diagram of the Discover Protocol for a 4 device segment. 1. The master powers up the bus segment to a known state. 2. The master transmits the Discovery Command. 3. After a predetermined delay (tSTART_DISC_RSP), all devices without a physical address activate a current ramp to the 2x response current at a ramp rate of iDISC_RAMP. 4. Each device monitors the current through its sense resistor (ΔiSENSE). a. If the current is above iRESP, the device disables its response current, increments its physical address counter, and waits for the next Discovery Command. b. If the current is low (ΔiSENSE less than iRESP), the device continues to ramp its response current to 2* iRESP in time tDISC_RAMP_RSP and maintains the current at 2* iRESP for time tDISC_IDLE_RSP. c. After time tDISC_IDLE_RSP, if a device has not detected a current through its current sense resistor of iRESP, the device accepts physical address '1' and disables its response current. 5. After a pre-defined period (tPER_DISC), the master transmits another Discovery Command. 6. Steps 3 and 4 are repeated, with the device accepting the address in its address assignment counter if the sense current is low. 7. The master repeats step 5 until it has transmitted Discovery Commands for all the devices it expects on the bus. 8. Device initialization can now begin using Command and Response Mode. Once the Discovery Mode is complete, a physical address is assigned to the device, and Command and Response Mode is used with the assigned physical address for further configuration. 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 151 / 254 |
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