RPM7137-H9R Rohm Semiconductor, RPM7137-H9R Datasheet - Page 24

• Manufacturer Part Number: RPM7137-H9R
• Description: Infrared Receivers REMOTE CTRL 36.7KHZ
• Manufacturer: Rohm Semiconductor

Specifications of RPM7137-H9R

• Carrier Frequency: 36.7 KHz
• Transmission Distance: 15 m
• Viewing Angle: 45 deg, 35 deg
• High Level Pulse Width: 800 us
• Low Level Pulse Width: 800 us
• Minimum High Level Output Voltage: 4.5 V
• Output Current: 2 mA
• Operating Voltage: 4.5 V to 5.5 V
• Supply Current: 0.95 mA
• Maximum Operating Temperature: + 75 C
• Minimum Operating Temperature: - 10 C
• Package / Case: RSIP-A3
• Sensing Distance: 15m
• B.p.f. Center Frequency: 36.7kHz
• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 1.5mA
• Orientation: Top View
• Mounting Type: Through Hole
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8. Measures for Preventing Malfunctions
1) Receiving Code Discrimination
2) Falling Edge Discrimination of Single Pulse
2) Pulse Split
If there is strong external noise (e.g., optical noise, electromagnetic noise, or power supply
ripples), noise pulses may be generated from the output terminal regardless of whether the
input signal exists or not.
Noise pulses may be generated in the output due to the influence of external noise.
Therefore, the discrimination of receiving with a non-coded signal (e.g., the falling edge of
a single pulse only) is not recommendable.
By always discriminating the receiving of a number of bits in combination as a code, the
malfunctioning of the unit can be prevented.
If a pulse is split midway, write a receiving discriminative program to ignore the split pulse
so that a sufficient effective distance will be secured.
Incidence of excessive
external noise
Precautions for Designing Receiver Side/Receiving Discrimination Method to Expand Effective Distance/Measures for Preventing Malfunctions
In the above case, it is ideal to use the lead pulse and the code.
Fig. 26 ON Pulse Split
22
A pulse split may be caused by external noise,
such as optical noise or electromagnetic noise.
Pulse split