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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ADPD1081 датащи(PDF) 52 Page - Analog Devices |
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ADPD1081 датащи(HTML) 52 Page - Analog Devices |
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52 / 74 page  ADPD1080/ADPD1081 Data Sheet Rev. C | Page 52 of 74 phase of the integration during the dumping of the charge from the photodiode causes the integrator to increase with the negative going output signal from the TIA. The LED flashes in the second and third pulses of the four pulse sequence. Setting Register 0x58, Bits[6:5] = 2 and Register 0x58, Bits[11:10] = 1 forces the device to add the second and third pulses while subtracting the first and fourth pulses, effectively cancelling out the ambient light and electrical offsets and drift. A comparison of float ambient mode vs. float LED mode is shown in Table 33 and Table 34. PRECONDITION LED PULSES REGISTER 0x5A, BITS[15:12] = 0x9 MASK PULSES 1 AND 4 FLASH PULSES 2 AND 3 ACCUMULATED CHARGE ON PD INTEGRATOR OUTPUT INTEGRATOR SEQUENCE INTEGRATOR RESET ADC READ t = 0 t = 16µs, REGISTER 0x59, BITS[12:8] = 0x10 PRECONDITIONING TIME t = 26.75µs, REGISTER 0x3B, BITS[10:0] = 0x238 START OF INTEGRATION TIME t = 30µs, REGISTER 0x35, BITS[7:0] = 0x1E TIME OF FIRST CHARGE DUMP MASKED LED PULSE t = 17µs, REGISTER 0x3F, BITS[7:0] = 0x11 LED PULSE OFFSET REGISTER 0x3F, BITS[12:8] = 0xC LED PW = 12µs REGISTER 0x36, BITS[7:0] = 0x10 FLOAT PERIOD = 16µs REGISTER 0x3B, BITS[15:11] = 0x3 INTEGRATION TIME = 3µs MASKED LED PULSE REGISTER 0x35, BITS[12:8] = 0x2 CHARGE DUMPTIME = 2µs FLASH LED FLASH LED CONNECT/FLOAT Figure 55. Example Timing Diagram of Four Pulse Float LED Mode Sequence Table 33. Float Ambient Mode—Measure Ambient Light Level Pulse Float Time Integrated Charge Calculation Result 1 Shorter Offset, Ambient 1 (shorter time) Subtract Ambient Measurement = Ambient 2 – Ambient 1 (Offset Cancels) 2 Longer Offset, Ambient 1 (shorter time) Add 3 Not applicable Not applicable Not applicable 4 Not applicable Not applicable Not applicable Table 34. Float LED Mode—Measurement Synchronous Reflected Light from LED Pulse Float Time Integrated Charge Calculation Result 1 Equal Offset + Ambient Subtract Sync LED Response = Reflected LED Return (Offset and Ambient Cancels 2 Equal Offset + Ambient + LED Add 3 Equal Offset + Ambient + LED Add 4 Equal Offset + Ambient Subtract |
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