EPC111 Datasheet, PDF (7/14 Pages) Espros Photonics corp – Fully integrated standalone light barrier driver & receiver

epc111/112
Light Reserve Output OUTH
However, if the incoming signal is just at the trigger threshold of OUTN, an unstable situation can occur. Thus, a second output OUTH is
integrated with a higher trigger threshold to indicate that a certain 'light reserve' is reached (see Figure 3). This output is usually used to drive
a visible LED to indicate to the operator a stable detection function of the light barrier. To have not too short pulses OUTH, this signal is
stimulated by signal OUTH Filter and synchronously reset by OUTN.
The trigger threshold of OUTH is set approx. 50% above the trigger threshold of OUTN.
Emitter LED
OUTN Filter
OUTH Filter
OUTN
OUTH
Figure 5: synchronization OUTH with OUTN
This output is not CMOS compatible. Its voltage is depending of the load according to Figure 6. To have still digital compatible signals a level
conversion is necessary.
OUTH high max.
OUTH low max.: 3.6V / - 40ºC
OUTH low typ.
OUTH low min.: 3.0V / + 85ºC
Voltage OUTH [V]
Figure 6: Output voltage versus output current of output OUTH
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© 2011 ESPROS Photonics Corporation
7
Characteristics subject to change without notice
Datasheet epc111_112 - V2.2
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