RPM871-E4 Rohm Semiconductor, RPM871-E4 Datasheet - Page 5

• Manufacturer Part Number: RPM871-E4
• Description: Infrared Transceivers IRDA INFRARED COMMUNICATIONS
• Manufacturer: Rohm Semiconductor

Specifications of RPM871-E4

• Wavelength: 870 nm
• Continual Data Transmission: 115.2 Kbit/s
• Transmission Distance: 60 cm
• Radiant Intensity: 36 mW/sr
• Half Intensity Angle Degrees: 36 deg
• Pulse Width: 2.3 us
• Maximum Rise Time: 70 ns, 100 ns
• Maximum Fall Time: 30 ns, 100 ns
• Led Supply Voltage: 2.6 V to 5.5 V
• Maximum Forward Current: 144 mA
• Operating Voltage: 2.6 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 20 C
• Package / Case: RSLP-8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Photo Link Module
Recommended values
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
Link distance : d[cm] (Including LED’s distribution within ±15deg)
R1=T × (VLEDV
ILED=Duty × (VLEDVCC−1.36) / (R1+2.5) [A]
∗ Please set up to be ILED / Duty < 200[mA]
(Emitting side)
(Detecting side)
Part symbol
Timing chart
Attached components
C1
R1
TXD
Internal LED
Light input
RXD
PWDOWN
(7pin)
(Light output)
(6pin)
(5pin)
Duty : LED duty at emitting
T : 17300 (vs. RPM871), 29400 (vs. ver1.0)
1µF, tantalum or ceramic
7.5Ω±5%, 1/4W
Ex.) TCFGA1A105M8R (ROHM)
(VLEDV
CC
−1.45) / d
Recommended value
less than 45µs
less than 2.3µs
CC
approximately 2.3µs
=2.8V)
2
−3.5 [Ω]
(emitting)
(Duty < 20%)
more than 45µs
more than 2.3µs
Bigger capacitance is recommended with much noise from power supply
More than 60cm distance, more than 4[µW/cm
(vs ver1.0)
More than 46cm distance, more than 6.8[µW/cm
(vs RPM871)
approximately 45µs
approximately 2.3µs
(emitting)
Notice
pull up to V
(emitting)
2
] at detecting side.
2
] at detecting side.
CC
Rev.B
at approximately 300kΩ
CC
[V],
RPM871
5/7