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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AS39513 датащи(PDF) 87 Page - ams AG |
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AS39513 датащи(HTML) 87 Page - ams AG |
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87 / 108 page  ams Datasheet Page 87 [v1-10] 2018-Apr-25 Document Feedback AS39513 − Detailed Description The do measurement command initiates a specific measurement outside the normal logging loop. The command reply will wait for the ADC conversion to complete. The ADC algorithm will use a mode that always takes the same amount of time for a given oscillator clock frequency, independent of the conversion value. The format of the Meas parameter is below. Measurement Parameter Format where: DOMEAS[1:0] – Measurement type to initiate. 0 = Do a temperature measurement. 1 = Do a battery level measurement. 2 = Do a sensor measurement. 3 = Reserved; do not use. Note the Do Measurement -Temperature command results in some self heating of the chip due to the presence of the RF field from the reader, so temperature accuracy cannot be guaranteed with this command. Temperature sensing is intended to be carried out in logging mode. The do measurement command returns the 10-bit ADC result, formatted in a two-byte word as shown below, ADC Result Format where: ADC_RES[9:0] – ADC measurement result. An example of a “good” reply is 0x0001AC (where 00 => no error in RFLAGs, and 01AC => ADC data). An ADC error reply is 01A3 (where 01 => error indicated in RFLAGS, A3 => ADC error code) Bit 7 65 43 21 0 Meas 00 00 00 DOMEAS[1:0] Bit 15 14 13 12 11 10 9 87 65 43 2 1 0 ADC 0 0 000 0 ADC_RES[9:0] |
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