RPM7237-V4R Rohm Semiconductor, RPM7237-V4R Datasheet - Page 15

• Manufacturer Part Number: RPM7237-V4R
• Description: RECEIVER REMOTE CTRL 36.7KHZ L
• Manufacturer: Rohm Semiconductor

Specifications of RPM7237-V4R

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

• Detection
• Comparator
4. Remote Control Transmission Signal
Remote Control Receiver Module
Various methods are used for signal transmission, because there are no unified standards. The
same PPM (pulse position modulation) code is used to discriminate 1 and 0 according to the pulse
time interval.
The amplitude of the subcarrier is modified according to the pulse train. Therefore, the subcarrier
frequency range is between 33 and 57kHz.
This block has a detector and integrator.
The detector automatically determines the level of detection (a) according to the level of BPF
output, and sets the timing of integration.
Only the pure signal is extracted from the input signal that includes noise, at which time the level
of detection is automatically adjusted according to the output amplitude of the BPF.
The output of the detection block is converted into a binary. The hysteresis (b) prevents chattering
that results from noise.
BPF output
Detection
Integral
comparator
R
OUT
(b)
(a)
Fig. 8 Waveform Shaping of RPM7100-Hx/RPM7200-Hx
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