RPM871-H7

Photo Link Module

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Timing chart

less than 45

µs

(emitting)

more than 45

µs

approximately 45

µs

less than 2.3

µs

more than 2.3

µs

approximately 2.3

µs

approximately 2.3

µs

Ω

(emitting)

(emitting)

(Emitting side)

(Detecting side)

TXD

(7pin)

Internal LED

(Light output)

Light input

RXD

(6pin)

PWDOWN

(5pin)

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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

7.5

Ω±5%, 1/4W

=2.8V)

More than 60cm distance, more than 4[

(vs ver1.0)

More than 46cm distance, more than 6.8[

(vs RPM871-H7)

In case of using R1 with different condition from the above, formula is as follows :

LED resistance value : R1[

Link distance : d[cm] (Including LED’s distribution within

±15deg)

R1=T

ILED=Duty

× (VLEDVCC−1.36) / (R1+2.5) [A]

Duty : LED duty at emitting

T : 17300 (vs. RPM871-H7), 29400 (vs. ver1.0)

∗ Please set up to be ILED / Duty < 200[mA]

(Duty

< 20%)