Seiko LTP F Series Especificaciones descargar pdf (Pagina 48)

3-30

Table 3-14 Paper Detector Input/Output Conditions

Item Symbol Conditions Min. Std. Max.

Forward voltage V

=10 mA 1.0 V 1.2 V 1.6 VLED (input)

Reverse current I

=5 V   10 µA

Photo-

transistor

(output)

Dark current I

CEO

=0 mA, V

=10 V   200 nA

Photoelectric current I

=10 mA, V

=5 V 150 µA  600 µA

Leak current I

LEAK

=10 mA, V

=5 V   1 µA

Collector saturation

voltage

(sat) I

=10 mA, I

=5 µA   0.5V

Response time

(at rise)

tr  5µs 

Transfer

characteristics

Response time

(at fall)

=1mA, V

=5 V

100Ω

 5µs 

3.7.2 Sample External Circuit

∗

The PS signal is high when there is no paper.

Figure 3-15 Sample External Circuit of the Paper Detector

VPS

GND

Photo-interrrupter

To CPU port

(5 V) V

(5 V)

47 kΩ 220 Ω

GND

LTP F Series

74HC04

0.1 µF

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 85 86

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