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TSL2771 데이터시트(PDF) 23 Page - OSRAM GmbH

부품명 TSL2771
상세설명  Light-to-Digital Converter with Proximity Sensing
PDF  51 Pages
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제조업체  OSRAM [OSRAM GmbH]
홈페이지  http://www.osram.com
Logo OSRAM - OSRAM GmbH

TSL2771 데이터시트(HTML) 23 Page - OSRAM GmbH

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Page 22
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Document Feedback
[v1-00] 2016-Mar-22
TSL2771 − Principles O f Operation
Power Management
Power consumption can be controlled through the use of the
wait state timing because the wait state consumes only 65
μA
of power. Figure 25 shows an example of using the power
management feature to achieve an average power
consumption of 155
μA current with four 100-mA pulses of
proximity detection and 50 ms of ALS detection.
Figure 25:
Power Consumption Calculations
4 IR LED Pulses
64
ms (32 ms LED On Time)
2.72 ms
47 ms
50 ms
Prox ADC
Prox Accum
WAIT
ALS
Avg = ((0.032
y 100) + (2.72 y 0.175) + (47 y 0.065) + (50 y 0.175)) / 100 = 155 mA
State
Duration (ms)
Current (mA)
Prox Accum (LED On)
0.064 (0.032)
100.0
Prox ADC
2.7
0.175
Wait
47
0.065
ALS
50
0.175
Example: 100 ms Cycle TIme



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