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RPM873 
 
Photo Link Module
 
 
Rev.B
5/6 
 
Timing chart
less than 48 祍
(emitting)
more than 48 祍
approximately 48 祍
less than 2.3 祍
more than 2.3 祍
approximately 2.3 祍
pull up to VCC at approximately
300 k&
(emitting)
(emitting)
(Emitting side)
(Detecting side)
TXD
 (7pin)
Internal LED
(Light output)
Light input
RXD
 (6pin)
PWDOWN
 (5pin)
 
 
 
Notes
1) VLEDA (8pin) and VCC (3pin)
  "Other power source can be used difference between VLEDA and VCC.
 
2) Caution in designing board lay-out
To get maximum potential from RPM873, please keep in mind following instruction.
 
"The line of RXD (6pin) should be connected at backside via through hole close to RPM873 pin lead.
  Better not to be close to photo diode side (1pin).
  襎his is to minimize feedback supplied to photo diode from RXD.
"Better to be placed more than 1.0cm in radius from photo diode (pin1 side) and also away from the parts which
  generate noise, such as DC / DC converter.
"As for C1 between 3-4pin should be placed close to RPM873.
 
3) Notes
"Please be sure to set up the TXD (7pin) input to be L (under 0.55V) except transmitting data
(for<90祍, ON duty<20%)
"Power down current might increase if exposed by strong light (ex. direct sunlight) at power down mode.
"Please use by the signal format which is specified by lrDA Ver1.2 (2.4k to 115.2kbps).
There might be on error if used by different signal format.
 
4) Eye Safe
"IEC825-1 (EN60825-1) Class 1 Eye Safe.
 
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