Datasheet

EE-SA701/801
118
Operating Principles
This is a pushbutton-type sensor. An emitter (GaAs infrared LED) and
receiver (Si photo IC) are positioned across from each other inside the
sensor and light is received when there is no sensing object. When
the sensing object presses the actuator, the light path between the
emitter and receiver is broken so that the receiver no longer receives
light.
This Sensor provides an external diagnosis function and stability
checking function.
(1) External Diagnosis Function
The light emission from the LED can be stopped by using the
following circuit configuration. This enables checking the operation of
the receiver by turning the LED ON and OFF when there is no load.
(2) Stability Checking Function
The light intensity emitted by the LED can be reduced by 20% by
using the following circuit configuration. By doing so, the light
reception operation at 80% light intensity with no sensing object
(same as 100%, i.e., the output transistor should turn ON) can be
tested in advance to check for malfunctions caused by deterioration
of LED light intensity.
(3) Using Both Functions Simultaneously
Use the following circuit configuration when both the external
diagnosis function (Sig1) and the stability checking function (Sig2) are
required.
Note: Use a transistor that is capable of switching 50 mA at 10 V.
The resistor must have a power rating of 1/8 W min.
Emitter
Case
Without FOUP With FOUP
Actuator
Receiver
Sensing object
Emitter
Case
Actuator
Receiver
External diagnosis
input
Control circuitsSensor
OUT
(See note.)
EE-SA801A/-SA-801A-R/-SA701-R
External diagnosis
input
Sensor Control circuits
OUT
EE-SA801R/-SA-801R-R/-SA701P-R
OUT
430 Ω
Control circuits
Sensor
External diagnosis
input
(See note.)
(See note.)
EE-SA801A/-SA-801A-R/-SA701-R
Sensor Control circuits
OUT
430 Ω
External diagnosis
input
EE-SA801R/-SA-801R-R/-SA701P-R
OUT
430 Ω
Sig2
Sig1
Control circuits
Sensor
External diagnosis
input
(See note.)
(See note.)
(See note.)
EE-SA801A/-SA-801A-R/-SA701-R
Sensor Control circuits
OUT
External diagnosis
input
430 Ω
Sig1
Sig2
EE-SA801R/-SA-801R-R/-SA701P-R