RPM871-H14 데이터 시트보기 (PDF) - ROHM Semiconductor
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RPM871-H14 Datasheet PDF : 8 Pages
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Photo Link Module
zTiming chart
(Emitting side)
TXD
(7pin)
less than 45µs
more than 45µs
(emitting)
(emitting)
Internal LED
(Light output)
approximately 45µs
(Detecting side)
Light input
less than 2.3µs
more than 2.3µs
RXD
(6pin)
approximately 2.3µs
approximately 2.3µs
RPM871-H14
(emitting)
pull up to VCC at approximately 300kΩ
PWDOWN
(5pin)
zAttached components
Recommended values
Part symbol
Recommended value
C1
1µF, tantalum or ceramic
Ex.) TCFGA1A105M8R (ROHM)
R1
7.5Ω±5%, 1/4W
(VLEDVCC=2.8V)
Notice
Bigger capacitance is recommended with much noise from power supply
More than 60cm distance, more than 4[µW/cm2] at detecting side.
(vs ver1.0)
More than 46cm distance, more than 6.8[µW/cm2] at detecting side.
(vs RPM871-H14)
In case of using R1 with different condition from the above, formula is as follows :
LED resistance value : R1[Ω], LED average consumption current : ILED[mA], Supply voltage : VLEDVCC[V],
Link distance : d[cm] (Including LED’s distribution within ±15deg)
R1=T × (VLEDVCC−1.45) / d2−3.5 [Ω]
ILED=Duty × (VLEDVCC−1.36) / (R1+2.5) [A]
Duty : LED duty at emitting
T : 17300 (vs. RPM871-H14), 29400 (vs. ver1.0)
∗ Please set up to be ILED / Duty < 200[mA] (Duty < 20%)
5/7
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