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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MAX17843 датащи(PDF) 66 Page - Maxim Integrated Products |
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MAX17843 датащи(HTML) 66 Page - Maxim Integrated Products |
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66 / 131 page  ALTREF Diagnostic Measurement The ALTREF diagnostic measurement (DIAGSEL[2:0] = 0b001) checks the primary voltage reference of the ADC by measuring the alternate reference voltage (VALTREF). The result is available in the DIAG register after a normal acquisition. The ALTREF voltage is computed from the result in the DIAG register as follows: VALTREF = (DIAG[15:2]/16384d ) x 5V Since 1.23V < VALTREF < 1.254V and VALTREF = 1.242V nominally, the expected range for DIAG[15:2] is: (1.23V/5V) x 16384d = 4030d to (1.254V/5V) x 16384 = 4109d. Therefore, 0FBEh ≤ DIAG[15:2] ≤ 100Dh. To use the 16-bit register value, the 14-bit values must be shifted or multiplied by four, so that 3EF8h ≤ DIAG[15:0] ≤ 4034h. Figure 36. ALTREF Diagnostic ADC IN - ADC IN + ALTREF LV MUX ADC REF THRM + - LSAMP HVMUX BUS AGND G = 6/13 ADC AUTOMATICALLY IN UNIPOLAR MODE MAX17843 12-Channel, High-Voltage Smart Sensor Data-Acquisition Interface www.maximintegrated.com Maxim Integrated │ 66 |
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