LTPH245 datasheet(43/64 Pages) SII

No. de pieza	LTPH245

Descripción Electrónicos	LINE THERMAL PRINTER MECHANISM TECHNICAL REFERENCE

PDF	64 Pages

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Fabricante Electrónico	SII [Seiko Instruments Inc]

Página de inicio	http://www.sii.co.jp

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43 / 64 page

3-30

3.8

PLATEN POSITION SENSOR

The printer has a platen position sensor to detect whether or not the platen block is set.

The platen position sensor is a switch type sensor shown in Figure 3-13. The platen position sensor

switch is closed when the platen block is set and is open when the platen block is released.

Design the control circuit so that the motor is not driven and the thermal head is not activated when the

platen block is open by detecting output of the platen position sensor.

3.8.1

General Specification

Maximum rating: DC30V, 0.5A

Connection resistance: 200 m

Ω or less

3.8.2

Sample External Circuit

Figure 3-13 Sample External Circuit of the Platen Position Sensor

•

Note that there is a time lag between operation of the platen position sensor and

completion of pressurization to thermal head.

•

To prevent a malfunction due to chattering of the switch, be sure to use the capacitor

shown in Figure 3-13.

Switch

GND

CPU Port

Vdd (5v)

R=100k

Ω

GND

C=0.1

µF

* When the platen block is open

LTPH245

LTPH245 Datasheet(PDF) 43 Page - Seiko Instruments Inc