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TMD3721 数据表(PDF) 19 Page - OSRAM GmbH |
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TMD3721 数据表(HTML) 19 Page - OSRAM GmbH |
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19 / 89 page  Page 18 Datasheet, Public Document Feedback [v3-00] 2023-May-26 TMD3721 − Detailed Description AWTIME defines the ALS repetition period. In non-synchronous mode, the subsequent ALS cycle will begin at the end of the AWTIME period. In synchronous mode, the subsequent ALS cycle will occur on the first VSYNC after the end of the AWTIME period, plus the delay defined by ASD. PWTIME defines the proximity repetition period. In non-synchronous mode, the subsequent proximity cycle will begin at the end of the PWTIME period. In synchronous mode, the subsequent proximity cycle will occur on the first VSYNC after the end of the PWTIME period, plus the delay defined by PSD. Figure 19 shows the ALS and proximity timing during concurrent mode. In concurrent mode, it is important to configure ALS hold (CFG2 (0xA7), bit 3) correctly in order to avoid a situation where ALS is constantly interrupted and cannot complete in a timely manner. It is recommended to pause ALS only during the time the emitter is pulsing (CFG2, bit 3=1). This may result in a slight increase in ALS data noise, but the trade-off is a shorter pause time. Figure 19: ALS and Proximity Measurement in Concurrent Mode ALS integ ASD AWTIME ALS_Init_Time Start s hifts AVSYNC_EN=0 PSD Prox integ Prox_Init_Time Start s hifts PVSYNC_EN=0 PSD Prox integ Temp_Meas (if en abled) PWTIME Start s hifts PVSYNC_EN=0 Temp_Meas (if en abled) Prox_Init_Time PWTIME ASD ALS integ ALS_Init_Time Start s hifts AVSYNC_EN=0 PSD Prox integ Temp_Meas (if en abled) Start s hifts PVSYNC_EN=0 Prox_Init_Time PWTIME ALS hold ALS integ ALS hold ALS integ PON=1 PEN=AEN=1 PWEN=AWEN=1 PVSYNC=1 AVSYNC=1 VSYNC |
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