RPM872-H14
Photo Link Module
Rev.A
3/6
Terminal description
Function
Pin No
1, 4
GND
GND
Pin1 and Pin4 must be connected to the
ground.
VIO
Supply voltage for I/O pins (PWDOWN,
RXD, TXD)
Power-down Control Terminal
CMOS logic level input
When input is H, it will stop the receiving
circuit, Pin-PD current and transmitting
LED operation.
H : POWERDOWN MODE
L : OPERATING MODE
Connect to Ground.
2
VIO
PWDOWN
RXD
TXD
LEDA
Shield Case
3
5
6
7
8
VCC
VIO
VIO
600k
LED
VIO
VIO
PWDOWN
300k
VCC
Supply voltage for Transceiver circuits.
For preventing from infection,
connect a capacitor between
VCC(3pin) and GND(4pin).
Receiving Data Output Terminal
CMOS logic level output
When PWDOWN (5pin) = H, the RXD
output will be pulled up to
VIO at approximately 300k&.
Transmitting Data Input Terminal
H : LED (PWDOWN = L)
CMOS logic level input
Holding TXD = "H"status, LED will
be turn off approximately 48祍.
LED ANODE Terminal
Other power source can be used
difference between LEDVCC and VCC.
This can be connected to battery kinds
of unregulated voltage source by internal
constant current driver.
Terminal
Circuit
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