RPM7236-H9R Rohm Semiconductor, RPM7236-H9R Datasheet - Page 23

• Manufacturer Part Number: RPM7236-H9R
• Description: RECEIVER REMOTE CTRL 36.0KHZ TOP
• Manufacturer: Rohm Semiconductor

Specifications of RPM7236-H9R

• Sensing Distance: 15m
• B.p.f. Center Frequency: 36.7kHz
• Voltage - Supply: 2.7 V ~ 3.6 V
• Current - Supply: 500µA
• Orientation: Top View
• Mounting Type: Through Hole
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

7. Receiving Discrimination Method to Expand Effective Distance
Remote Control Receiver Module
1) Wide Pulse Width Jitter
«Bad Example»
Transmission waveform
Receiving waveform
at short distance
Receiving waveform
at long distance
If the communications distance is long or angled or has the incidence of optical noise, the
output pulse jitters will become larger at the limit of receiving, thus increasing the errors of the
pulse intervals T1 and T2. In order to correct the errors, T1" and T2" are provided with margins
according to the software discrimination of receiving, thus making it possible to increase the
effective distance.
In the above wiring pattern, the power noise of the digital block has an adverse influence on
the power supply pattern of the Remote Control Receiver Module.
Digital
block
GND
V
DD
Fig. 24 Countermeasures against Line Noise (Not Good)
Noise loop
Noise
T1
T1'
T1''
Fig. 25 Jitter Countermeasures
Remote Control
Receiver
Noise
Module
GND
V
CC
21
T2
T2'
T2''
Noise loop
Noise