LTPH245 datasheet(4/64 Pages) SII

4 / 64 page

TABLE OF CONTENTS

Section

Page

CHAPTER 1 PRECAUTIONS

1.1

SAFETY PRECAUTIONS .............................................................................................

1-1

1.2

DESIGN AND HANDLING PRECAUTIONS .................................................................

1-2

1.2.1

Design Precautions..........................................................................................

1-2

1.2.2

Handling Precautions.......................................................................................

1-4

CHAPTER 2 FEATURES

CHAPTER 3 SPECIFICATIONS

3.1

GENERAL SPECIFICATIONS......................................................................................

3-1

3.2

HEAT ELEMENT DIMENSIONS...................................................................................

3-3

3.3

PAPER FEED CHARACTERISTICS ............................................................................

3-4

3.4

STEP MOTOR CHARACTERISTICS ...........................................................................

3-5

3.4.1

Motor Drive Circuit ...........................................................................................

3-6

3.4.2

Motor Timing ....................................................................................................

3-8

3.4.3

Precautions for Driving the Motor ....................................................................

3-10

3.5

THERMAL HEAD..........................................................................................................

3-12

3.5.1

Structure of the Thermal Head ........................................................................

3-12

3.5.2

Printed Position of the Data .............................................................................

3-14

3.5.3

Head Resistance..............................................................................................

3-15

3.5.4

Head Voltage ...................................................................................................

3-16

3.5.5

Peak Current....................................................................................................

3-16

3.5.6

Thermal Head Electrical Characteristics..........................................................

3-17

3.5.7

Timing Chart ....................................................................................................

3-18

3.6

CONTROLLING THE HEAD ACTIVATION (DST) PULSE WIDTH .............................

3-19

3.6.1

Calculation of Head Activation Pulse Width.....................................................

3-19

3.6.2

Calculation of Applied Energy..........................................................................

3-19

3.6.3

Calculation of Head Activation Voltage ............................................................

3-20

3.6.4

Calculation of Head Resistance.......................................................................

3-20

3.6.5

Determination of Activation Pause Time and Activation Pulse Period.............

3-21

3.6.6

Head Activation Pulse Term Coefficient ..........................................................

3-21

3.6.7

Head Storage Coefficient.................................................................................

3-22

3.6.8

Calculation Sample for the Head Activation Pulse Width ................................

3-23

3.6.9

Thermistor Resistance.....................................................................................

3-24

3.6.10 Detecting Abnormal Temperatures of the Thermal Head................................

3-26

3.7

PAPER DETECTOR .....................................................................................................

3-27

3.7.1

General Specifications .....................................................................................

3-27

3.7.2

Sample External Circuit ...................................................................................

3-28

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