RPM841-H16

Photo Link Module

Rev.B

8/9

Attached components

Recommended values

Part symbol

C1

Recommended value

Notice

1

µF, tantalum or ceramic

Ex.) TCFGA1A105M8R (ROHM)

Bigger capacitance is recommended with much noise from power supply

R1

2.2

Ω±5%, 1/8W

=3V)

At LED Emitting Duty=25%

[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[

minimum necessary of irradiant intensity le1 [mW / sr]

(Including LED’s distribution within

±15deg)

R1=166

ILED=Duty

× (VLEDVCC−1.31) / (R1+5.8)

Duty : LED duty at emitting

∗ Please set up to be ILED / Duty < 250[mA]

(Duty

≤ 25%)

∗ At IrDA Mode, LED current is constantly approximately 50mA.

(Reference) In case of using R1, typical intensity (le1typ) and maximum intensity (le1max) on

axis are described as below.

le1typ=280

le1max=560

Notes

2) Caution in designing board lay-out

To get maximum potential from RPM841-H16, please keep in mind following instruction.

be close to photo diode side (7pin).

⇒This is to minimize feedback supplied to photo diode from RXD.

generates noise, such as DC/DC converter.

3) Notes

(for

< 90µs, ON duty ≤ 50%).

might be on error if used by different signal format.

Dusts of scratch on the lens may effect the characteristics of product. Please handle it with care.