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ADXRS450BRGZ-RL Arkusz danych(PDF) 18 Page - Analog Devices |
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ADXRS450BRGZ-RL Arkusz danych(HTML) 18 Page - Analog Devices |
18 / 28 page ADXRS450 Preliminary Technical Data Rev. PrA | Page 18 of 28 0x2000000 0x2000000 0x2000003 0x2000000 ANOTHER 50ms DELAY NEEDS TO BE OBSERVED TO ALLOW THE FAULT CONDITIONS TO CLEAR. IF THE DEVICE IS FUNCTIONING PROPERLY, THE MISO RESPONSE CONTAINS ALL ACTIVE FAULTS, AS WELL AS HAVING SET THE MESSAGE FORMAT TO SELF-TEST DATA. THIS IS INDICATED THROUGH THE ST BITS BEING SET TO 0b10. A 50ms DELAY IS REQUIRED SO THAT THE GENERATION OF FAULTS WITHIN THE DEVICE IS ALLOWED TO COMPLETE. HOWEVER, AS THE DEVICE DATA IS LATCHED BEFORE THE CHK COMMAND IS ASSERTED, THE DEVICE RESPONSE DURING THIS COMMAND/RESPONSE EXCHANGE DOES NOT CONTAIN FAULT INFORMATION. THIS RESPONSE CAN BE DISCARDED. ONCE THE 100ms START-UP TIME HAS OCCURRED, THE MASTER DEVICE IS FREE TO ASSERT THE CHK COMMAND AND START THE PROCESS OF INTERNAL ERROR CHECKING. DURING THE FIRST COMMAND/ RESPONSE EXCHANGE AFTER POWER ON, THE ADXRS450 HAS BEEN DESIGNED TO ISSUE A PREDEFINED RESPONSE. POWER IS APPLIED TO THE DEVICE. WAIT 100ms TO ALLOW FOR THE INTERNAL CIRCUITRY TO BE INITIALIZED. THE FAULT BITS OF THE ADXRS450 REMAIN ACTIVE UNTIL CLEARED. DUE TO THE REQUIRED DECAY PERIOD FOR EACH FAULT CONDITION, FAULT CONDITIONS REMAIN PRESENT UPON THE IMMEDIATE DEASSERTION OF THE CHK COMMAND. THIS RESULTS IN A SECOND SEQUENTIAL RESPONSE IN WHICH THE FAULT BITS ARE ASSERTED. AGAIN, THE RESPONSE IS FORMATTED AS SELF-TEST DATA INDICATING THAT THE FAULT BITS HAVE BEEN SET INTENTIONALLY. ALL FAULT CONDITIONS ARE CLEARED, AND ALL SUBSEQUENT DATA EXCHANGES NEED ONLY OBSERVE THE SEQUENTIAL TRANSFER DELAY TIMING PARAMETER. 0x…FF OR 0x…FE (PARITY DEPENDENT) 0x…FF OR 0x…FE (PARITY DEPENDENT) 0x… 0x0000001 MOSI SCLK CS MISO 32 CLOCK CYCLES 32 CLOCK CYCLES 32 CLOCK CYCLES 32 CLOCK CYCLES DATA LATCH POINT MOSI: SENSOR DATA REQUEST CHK COMMAND ASSERTED MISO: STANDARD INITIAL RESPONSE MOSI: SENSOR DATA REQUEST THIS CLEARS THE CHK BIT MISO: SENSOR DATA RESPONSE MOSI: SENSOR DATA REQUEST MISO: CHK RESPONSE ST[1:0] = 0b10 MOSI: SENSOR DATA REQUEST MISO: CHK RESPONSE ST[1:0] = 0b10 XX X t = 100ms t = 150ms t = 200ms t = 200ms + tTD t = 200ms + 2 tTD Figure 27. Recommended Startup Sequence |
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