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