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AS7421 Scheda tecnica(PDF) 20 Page - OSRAM GmbH |
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AS7421 Scheda tecnica(HTML) 20 Page - OSRAM GmbH |
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20 / 53 page  Document Feedback AS7421 Functional Description Datasheet • PUBLIC DS000667 • v2-00 • 2022-Oct-13 52 │ 19 7.5 Typical Measurement Cycle Figure 15: Measurement C ycle with LED_WAIT_OFF = “1” Figure 16: Measurement C ycle with LED_WAIT_OFF = “0” Figure 17: Measurement State Explanation led_wait_off = 1'b1 Cycle State LED_ON tLED_ON WaitM A Idle AZ Cfg Integration Str Mv B C D optional - depending on the value LTF_CYCLE in the register CFG_LTF (0x67) Integration Str Cfg Integration Str Cfg Integration Str AZ Cfg A Cfg WaitC WaitC WaitC AZ AZ AZ tLED_ON AZ Cfg led_wait_off = 1'b0 Cycle State LED_ON tLED_ON tLED_ON tLED_ON tLED_ON WaitM A Idle AZ Cfg Integration Str Mv B C D optional - depending on the value LTF_CYCLE in the register CFG_LTF (0x67) Integration Str Cfg Integration Str Cfg Integration Str AZ Cfg A Cfg WaitC WaitC WaitC AZ AZ AZ AZ Cfg tLED_ON AZ Cfg Integration Str Mv WaitC AutoZero ... Configuration ... Integration cycle Store ... Move ... Wait Cycle ... Offset compensation of ADCs Set the ASETUP and SMUX values for the integration cycle Store the 16 x 16bit ADC data in the internal RAM Provision of a new memory area in the internal RAM for the next measurement Waiting time between integration cycles within a measurement (can optionally be switched on or off) Programable with registers LTF_WTIME (0x64 – 0x67) WaitM Wait Measurement ... Waiting time between the provision of a new memory area and the automatic start of the next measurement Programable with registers LTF_WTIME (0x64 – 0x67) Programable with register LTF_ITIME (0x61 – 0x63) |
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