RPM7237-H9R Rohm Semiconductor, RPM7237-H9R Datasheet - Page 23
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RPM7237-H9R
Manufacturer Part Number
RPM7237-H9R
Description
Infrared Receivers REMOTE CTRL 36.7KHZ
Manufacturer
Rohm Semiconductor
Specifications of RPM7237-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
2.5 V
Output Current
2 mA
Operating Voltage
2.7 V to 3.6 V
Supply Current
300 uA
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
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
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