RPM882-H14
Photo Link Module
8/9
zAttached components
Recommended values
Part symbol
C1
Recommended value
Notice
1µF, tantalum or ceramic
Ex.) TCFGA1A105M8R (ROHM)
Bigger capacitance is recommended with much noise from power supp
R1
4.7Ω±5%, 1/8W
(VLEDV
CC
=3V)
At LED Emitting Duty=20%
[LED current set-up method for Remote control mode]
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 : VLEDV
CC
[V],
minimum necessary of irradiant intensity le1 [mW / sr]
(Including LED’s distribution within ±15deg)
R1=166 × (VLEDV
CC
−1.28) / le1−5.0
ILED=Duty × (VLEDVCC−1.28) / (R1+3.5)
Duty : LED duty at emitting
∗ Please set up to be ILED / Duty < 250[mA] (Duty ≤ 50%)
∗ At IrDA Mode, LED current is constantly approximately 40mA.
(Reference) In case of using R1, typical intensity (le1typ) and maximum intensity (le1max) on
axis are described as below.
le1typ=300 × (VLEDV
CC
−1.28) / (R1+3.5)
le1max=600 × (VLEDV
CC
−1.28) / (R1+3.5)
zNotes
1) LEDV
CC
(8pin), V
CC
(3pin) and V
IO
(2pin)
•
Other power source can be used difference between LEDV
CC
and V
CC
and V
IO
.
(V
IO
< V
CC
+ 0.3V)
2) Caution in designing board lay-out
To get maximum potential from RPM882-H14, please keep in mind following instruction.
•
The line of RXD (6pin) should be connected at backside via through hole close to RPM882-H14 pin lead. Better not to
be close to photo diode side (1pin).
⇒This is to minimize feedback supplied to photo diode from RXD.
•
As for C1 between 1-3 pin should be placed close to RPM882-H14.
•
Better to be placed more than 1.0cm in radius from photo diode (pin1 side) and also away from the parts which
generates noise, such as DC
/
DC converter.
3) Notes
•
Please be sure to set up the TX-RC (4pin) and the TXD (7pin) input to be “L” (under 0.3V) except transmitting data
(for < 90µs, ON duty ≤ 50%).
•
Power down current might increase if exposed by strong light (ex. direct sunlight) at powerdown mode.
•
Please use by the signal format at IrDA operating mode which is specified by IrDA Ver1.2 (2.4k to 115.2kbps). There
might be on error if used by different signal format.
•
Please pay attention to the lens carefully.
Dusts of scratch on the lens may effect the characteristics of product. Please handle it with care.
