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AS73211 датащи(PDF) 27 Page - OSRAM GmbH |
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AS73211 датащи(HTML) 27 Page - OSRAM GmbH |
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27 / 66 page ![]() Document Feedback AS73211 Functional Description Datasheet • PUBLIC DS000556 • v3-01 • 2018-Feb-07 65 │ 26 It is also possible to use Power Down state in combination with SYNS mode. The falling edge at pin SYN immediately starts the conversion after Power Down ends shown by the signal at pin READY. That kind of measurement is only useful in case of the distance between falling edges at pin SYN is more than the conversion time, pause time and startup time together. Figure 25 shows the principle sequence of measurement in SYNS mode being ready (bits OSR:PD = ‚1‘ and OSR:SS = ‚1‘) and waiting for falling edge at pin SYN to startup. Figure 25: Principle Sequence of Measurement in SYNS Mode By additionally activated Standby (bit CREG3:SB = ‚1‘) a maximum of energy can be saved, because the operational readiness is given not until short before A/D conversion starts and with the beginning read process of the results (pause time) the device is already again saving energy in Standby state (see Figure 26). Figure 26 shows the principle sequence of measurement in SYNS mode being ready with OSR:PD = ‚1‘ (as in Figure 25), but now with bit CREG3:SB = ‚1‘ to save a maximum of energy as explained above. Figure 26: Principle Sequence of Measurement in SYNS Mode Being R eady with OSR:PD = ‚1‘ MEASUREMENT PAUSE POWDOWN POWDOWN MEASUREMENT 1 STATE MRES1 … MRES3 READY I²C activity data fetch RESULTS 1 OSR C0h SYN TCONV start start TBREAK TSTARTPD TSTARTPD SBY S MEASUREMENT 1 S POWDOWN STATE MRES1 … MRES3 READY I²C activity OSR C0h SYN start MEASUREMENT PAUSE POWDOWN data fetch RESULTS 1 start TBREAK TCONV TSTARTPD TSTARTSB TSTARTPD TSTARTSB STANDBY STANDBY |
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