LTPH245 datasheet(41/64 Pages) SII

41 / 64 page

3-28

3.7

PAPER DETECTOR

The printer has a built-in paper detector (reflection type photo interruptor) to detect whether paper is

present or not.

An external circuit should be designed so that it detects output from the paper detector and does not

activate the thermal head and motor when there is no paper. Doing not so may cause damage to the

thermal head or platen roller or shorten the life of the head significantly. If the motor is drived when it is

out-of paper, a load is put on the reduction gear and the life of the gear may be shortened.

3.7.1

General Specifications

Table 3-12 Absolute Maximum Ratings of Detectors

(at 25

°C)

Item

Symbol

Rating

Forward current

50 mA

Reverse voltage

5 V

LED (input)

Allowable current

70 mW

Collector-to-emitter

voltage

VCEO

20 V

Emitter-to-collector

voltage

VECO

5 V

Collector current

20 mA

Phototransistor

(output)

Collector loss

70 mW

Operating temperature

Topr

-20

°C to + 80°C

Storage temperature

Tstg

-30

°C to + 100°C

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