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TMG3992 датащи(PDF) 35 Page - OSRAM GmbH

номер детали TMG3992
подробное описание детали  Gesture, Color, ALS, and Proximity Sensor Module with mobeam™ Barcode Emulation
PDF  96 Pages
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производитель  OSRAM [OSRAM GmbH]
домашняя страница  http://www.osram.com
Logo OSRAM - OSRAM GmbH

TMG3992 датащи(HTML) 35 Page - OSRAM GmbH

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[v1-06] 2018-Feb-27
TMG3992 − Detailed Description
Figure 36:
Simplified Power Calculation
Equations
tLED ON NS = tLED ON EW = GPULSE x (GPLEN + 1.5)
tNS = tEW = 870 + GPULSE X (22 + 2 X (GPLEN + 1.5))
tGWAIT = 2.8ms X GWTIME
tTOTAL =tNS + tEW + tGWAIT
tLED x dcLED On Duty Cycle
tDevice x dc Device Duty Cycle
tWait x dc Wait Duty Cycle
Note: The “870” value is conversion time + settling time.
LDR
t
LED ON
–
NS
–
t
LED ON
–
EW
–
+
tTOTAL
----------------------------------------------------------------------------
×
=
0.790
tNS tEW
+
tTOTAL
------------------------
×
=
0.038
tGWAIT
tTOTAL
------------------
×
=
Example
Conditions
32
μs, 16pulses, 1 wait, 300mA
i DEVICE ANALOG = 0.79mA
I DEVICE DRIVE = 0.38mA
tON = 16 x 33.5 = 536 μs
tNS = 870 + 16 x (22 +(2 x 33.5))
= 2294 μs
tNSEW = 2294 + 2294 = 4586 μs
tGWAIT = 2800 μs
tTOTAL= 2800+4586 = 8400 μs
Duty Cycle LED ON = 536 + 536/7386 = 14.5%
iPower LED ON = 14.5% * 300 = 43.5mA
Duty Cycle Device = 4586/7386 = 62%
iPower Device = 62% * 0.79 = 0.490mA
Duty Cycle Wait = 2800/7386 = 38%
i POWER WAIT =38% * 0.038 = 0.014mA
i POWER TOTAL = 43.5 + 0.49 + 0.014 = 44mA



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