YAEN YAEN208 Series Use and care manual
YAEN208 technical reference
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YAEN208
serial
THERMAL PRINTER MECHANISM
TECHNICAL REFERENCE
Xiamen Yaen Electronic Technology Co., Ltd.
Add: 3rd Floor, No. 1, Shantou lane, Pantu village, XikeTown, Tong’an District, Xiamen, China
Phone：+86-15259204946
Email: sales@asia-printer.com
URL: www.asia-printer.com
YAEN208 technical reference
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Thermal printer mechanism
YAEN208
All reserves the right to make changes without notice to the specification and materials
contained herein, and shall not be responsible for any damage (including consequential) caused by
reliance on the materials presented, including but not limited to typographical, arithmetic, or listing
errors.
You can refer to our website：www.asia-printer.com for more information.
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Contents
CHAPTER 1 CHARACTERS AND OPERATING PRECAUTIONS ..................................................................5
1.1 Characters ...................................................................................................................................................................5
1.2 Operation precautions................................................................................................................................................6
CHAPTER 2 SPECIFICATIONS........................................................................................................................8
2.1 General specifications.................................................................................................................................................8
2.2 Heat element dimensions............................................................................................................................................9
2.3 Step motor characteristics........................................................................................................................................10
2.3.1 Step motor specification......................................................................................................................................10
2.3.2 Excitation sequence.............................................................................................................................................10
2.3.3 Accelerate time table...........................................................................................................................................11
2.4 Thermal head specifications.....................................................................................................................................12
2.4.1 General characteristics ........................................................................................................................................12
2.4.2 Maximum parameter ...........................................................................................................................................12
2.4.3 Characteristics recommended..............................................................................................................................13
2.4.4 Electrical characteristics......................................................................................................................................13
2.4.5 Timing characteristics .........................................................................................................................................15
2.4.6 Timing chart........................................................................................................................................................17
2.4.7 Equation ..............................................................................................................................................................17
2.4.8 Thermistor resistance ..........................................................................................................................................18
2.4.9 Structure figure....................................................................................................................................................19
2.4.10 Operating precautions........................................................................................................................................20
2.5 Pin assignment...........................................................................................................................................................21
2.6 Opto interrupter specification .................................................................................................................................23
CHAPTER 3 CASING DESIGN GUIDE...........................................................................................................24
3.1 Platen structure dimensions.....................................................................................................................................24
3.2 Mechanism structure dimensions ............................................................................................................................26
3.3 DEMO circuit figure.................................................................................................................................................27
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Chapter 1 Characters and operating precautions
1.1 Characters
Operating voltage range
The range of TPH operating voltage is 4.2V～8.5V and the range of logic voltage is 2.7V～
5.0V.
High resolution printing
A high-density printer head of 8 dots/mm make the printing clear and precise.
Printing speed adjustable
According to driving power and sensitivity of thermal paper, set different printing speed
required.The max speed is 90mm/s.
Easy paper loading
Detachable rubber roller structure makes the paper loading easier.
Low noise
Thermal line dot printing is used to guarantee low-noise printing.
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1.2 Operation precautions
1）TPH and photo interrupter is sensitive to static electricity,in order to prevent damages of
inner parts of the printer caused by the static electricity,When handling this printer,please take any
preventive measures against static electricity, such as disposable static wrist strap.
2）When attaching the platen part to the platen retainer, pay attention not to flaw or damage or
smear the rubber part of the platen, the platen gear, and the bearing part (particularly, don’t attach
any oil or grease and foreign materials on the rubber part.)
3）Never attempt to touch the thermal printer head surface with bare hands. Attaching any oil
or grease such as oils from palms on the heating element part may be shortening the lifetime of the
thermal head. In case that any oil and grease or foreign materials are attached on it. Perform the
cleaning immediately.In addition, pay attention not to hit it with something hard such as driver.
4）When assemble the platen to the platen retainer of the casing, make sure that the
orientation is correct.
5）The thermal head and FPC are shipped as they are connected. When installing the printer,
do not pull or apply any extra force in order to avoid the connected part of the thermal head and
FPC from being disconnected or deviated. When connecting FPC, please make sure that the power
of control circuit is off. Plug in / out FPC to control board, should less than 10 times, meanwhile
make FPC parallel to connector Socket.
6) Do not make FPC bend because it may cause FPC disconnection or broken. If FPC requires
to be bent, the bending should be more than R1,and do not rework (straighten or bend backward).
7）The printer has a structure such that the platen part is removed from the printer cabinet.
Therefore, if any paper ejected from this printer is pulled away with an unnecessarily strong force, it
may cause the platen gear to get off the track and damage the gear. Do not attempt to pull any
paper ejected from the printer.
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8）If any voltage is applied to the thermal head when the head or paper is wet due to
condensation, it may be damaged by electrolytic corrosion; therefore, when using the printer, pay
attention to the following items.
*Do not apply any electric power to the printer when it is not used.
*Do not perform the printing with any wet paper.
*Do not apply any electric power to the printer under any environment where any dew
condensation is possible to occur.
*Turn off all electric power to the head immediately when condensation occurs.Use the head
only after the head is completely dried.
*Depending on the environment where the printer is used (the low temperature or high
humidity), condensation may be caused by water vapor generated from the used paper
when performing the printing of the high printing rate (solid fills, zigzag printing); therefore,
the environment should be considerably evaluated.
9）When using this mechanism for the continuous actions, the temperature of the head (the
temperature detected with the thermistor) should be equal or less than 75 Degrees.
10)Keep the paper conveyance unobstructed.
11) Use the high quality thermal paper, for the property of the paper have big effect on printing
quality. The perforated paper may cause the damage to the thermal heads and even shorten
lifetime.
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Chapter 2 Specifications
2.1 General specifications
Item
Specifications
Print method
Thermal dot line printing
Dots per line
384 dots
Resolution
8 dots/mm
Print width
48 mm
Paper width
57.5 ± 0.5 mm
W*D*H(mm)
67.3 mm * 17.8 mm * 32.0 mm
Paper feed pitch
0.03125 mm
Weight
30 g
Printing speed
90 mm/s
Head temperature detection
Via thermistor
Out-of-paper detection
Via photo interrupter
Life span (at 25℃and rated energy)
Activation pulse resistance
Abrasion resistance
100 million pulses or more (print ratio=12.5%)
50km or more
Operating temperature range (℃)
0～50
Operating humidity (RH)
20％～85％
Storage temperature range (℃)
-20～70
Storage humidity（RH）
10%～90%
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2.3 Step motor characteristics
2.3.1 Step motor specification
Item
Specification
Type
PM
Number of phases
2-phase
Excitation
1-2 phase
Winding resistance per phase
14.5Ω±10％
Rated voltage
4.2~8.5V
Drive frequency
183pps~3840pps
2.3.2 Excitation sequence
Table 2-1 Step drive
Signal
name
Sequence
STEP1
STEP2
STEP3
STEP4
STEP5
STEP6
STEP7
STEP8
PA
High
High
Low
Low
Low
Low
Low
High
PNA
Low
Low
Low
High
High
High
Low
Low
PB
Low
Low
Low
Low
Low
High
High
High
PNB
Low
High
High
High
Low
Low
Low
Low
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2.3.3 Accelerate time table
STEP
Time
(ms)
STEP
Time
(ms)
STEP
Time
(ms)
STEP
Time
(ms)
STEP
Time
(ms)
1
4.250
35
1.151
69
0.800
103
0.480
137
0.338
2
3.760
36
1.141
70
0.790
104
0.470
138
0.336
3
3.459
37
1.131
71
0.780
105
0.460
139
0.333
4
2.762
38
1.121
72
0.770
106
0.450
140
0.331
5
2.314
39
1.111
73
0.760
107
0.446
141
0.329
6
2.028
40
1.103
74
0.750
108
0.441
142
0.327
7
1.928
41
1.093
75
0.740
109
0.436
143
0.325
8
1.828
42
1.083
76
0.730
110
0.431
144
0.323
9
1.728
43
1.073
77
0.720
111
0.426
145
0.321
10
1.675
44
1.063
78
0.710
112
0.422
146
0.319
11
1.635
45
1.053
79
0.700
113
0.417
147
0.317
12
1.595
46
1.043
80
0.694
114
0.413
148
0.315
13
1.565
47
1.033
81
0.690
115
0.409
149
0.313
14
1.543
48
1.023
82
0.680
116
0.405
150
0.311
15
1.523
49
1.013
83
0.670
117
0.401
151
0.309
16
1.503
50
0.990
84
0.660
118
0.397
152
0.308
17
1.486
51
0.980
85
0.650
119
0.393
153
0.306
18
1.466
52
0.970
86
0.640
120
0.390
154
0.304
19
1.426
53
0.960
87
0.630
121
0.386
155
0.303
20
1.406
54
0.950
88
0.625
122
0.383
156
0.301
21
1.384
55
0.940
89
0.620
123
0.379
157
0.297
22
1.364
56
0.930
90
0.610
124
0.376
158
0.293
23
1.344
57
0.920
91
0.600
125
0.373
159
0.290
24
1.322
58
0.910
92
0.590
126
0.370
160
0.286
25
1.302
59
0.900
93
0.580
127
0.367
161
0.283
26
1.282
60
0.890
94
0.570
128
0.364
162
0.279
27
1.262
61
0.880
95
0.560
129
0.361
163
0.276
28
1.242
62
0.870
96
0.550
130
0.358
164
0.273
29
1.222
63
0.860
97
0.540
131
0.353
165
0.270
30
1.202
64
0.850
98
0.530
132
0.350
166
0.267
31
1.191
65
0.840
99
0.520
133
0.348
167
0.264
32
1.181
66
0.830
100
0.510
134
0.345
168
0.261
33
1.171
67
0.820
101
0.500
135
0.343
169
0.260
34
1.161
68
0.810
102
0.490
136
0.340
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2.4 Thermal head specifications
2.4.1 General characteristics
2.4.2 Maximum parameter
NOTE: On the above conditions,TPH can’t ensure the printing quality and life.
In the temperature which is out of range(+5°C~+40 °C), it will influence the printing quality.
Item
Specification
Note
Print width
48mm
Number of heater
elements
384 dots
Heater resolution
8 dots/mm
203dpi
Heater elements pitch
0.125 mm
Heater resistance
176Ω±4%
Number of data inputs
1 serial input
Data In
Heating voltage
4.2V~8.5V
Parameter
Symbol
Specification
Note
Heating energy
consumption
Eo max
0.26mJ/dot
1.25ms/line
Heating voltage
7.2V
Logic voltage
VDD
5 V
Including crest voltage
Environmental
temperature
Ta
-30 ℃～+50 ℃
Suggestion is above 5℃
Environmental
humidity
10～90%RH
Non-condensing
Maximum operating
temperature
Ts
Continuous:65°C 30min. MAX.
When up to 80°C Printing
must be stopped, and
wait until 60°C
Peak80°C Thermistor temp.
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2.4.3 Characteristics recommended
Parameters
Symbol
Recommended parameters
Note
Heating power
Eo
0.27W/dot
ave
R
=180Ω
Vdd=5V
64dots heating t
the same time
Heater voltage
VH
7.2V
Suggestion Speed
1.25ms/line
Heating
Energy
5℃
Eo
(ts)
T.B.D
25℃
T.B.D
45℃
T.B.D
Current
Io
2.5A
2.4.4 Electrical characteristics
1) Limited parameter
2) Recommended parameter
Item
Symbol
Text condition
Rated value
Unit
Supply voltage
VDD
Surge
0～7
V
VH
Surge
0～10
V
Logic input
voltage
0～VDD+0.5
V
Drive supply
current
70
mA
Item
Symbol
Text
condition
Reference
Unit
Min.
Typ.
Max.
Supply
voltage
VDD
2.7
5.0
5.5
V
VH
-
-
8.5
V
Logic input
voltage
0.8*VDD
-
VDD
V
0
-
0.2*VDD
V
Clock
frequency
Duty 50%
-
-
10
MHz
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3) Electrical characteristics
Note：STROBE includes pull-down resistance of 50KΩ±50% per IC
2.4.5 Timing characteristics
Parameter
Symbol
Ratings
Min.
Typ.
Max.
unit.
Clock
frequency
-
-
10
MHz
Clock pulse
width
40
-
-
ns
Data setup
time
40
-
-
ns
Data hold time
40
-
-
ns
Latch setup
time
100
-
-
ns
Latch pulse
width
100
-
-
ns
Latch to
Strobe setup
time
100
-
-
ns
Strobe to
Latch setup
time
100
-
-
ns
Clock to Data
out delay time
-
-
50
ns
Strobe to
driver
Output delay
time
-
-
13.0
μs
-
-
13.0
μs
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2.4.6 Timing chart
*: While printing, data transmission is possible.
2.4.7 Equation
Calculate the printing energy using this equation：
2
2
2)( leadICavecom
save
soo RRRNR tRVH
tRIE +++
==
RIC 9Ω
tsHeating time
VH Heating voltage
ave
R
Average resistance value
N Heating dots at the same time 64dots
com
R
Common electrical resistance 0.08Ω
lead
R
Connecting line resistance
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2.4.8 Thermistor resistance
Temperature
( °C )
Thermistor Resistance (R)
Min.(KΩ)
Typ.(KΩ)
Max.(KΩ)
-40
717
843
989
-35
535
623
723
-30
405
466
535
-25
308
352
400
-20
238
269
303
-15
185
208
232
-10
145
161
178
-5
113
124
137
0
88.7
96.8
105
5
69.9
75.7
81.7
10
55.4
59.9
63.8
15
44.1
47.1
50.1
20
35.4
37.5
39.6
25
28.5
30
31.5
30
22.8
24.2
25.5
35
18.3
19.6
20.8
40
14.9
15.9
17.1
45
12.1
13.1
14.1
50
9.92
10.8
11.7
55
8.16
8.91
9.7
60
6.76
7.41
8.12
65
5.62
6.2
6.83
70
4.7
5.21
5.77
75
3.95
4.4
4.9
80
3.34
3.74
4.18
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2.4.10 Operating precautions
In order to prevent the printer head heater element overheating or burned up, when we
designing products, pay attention to the points as follows:
In hardware terms:
1) When the power on, the order should be VDD→VH.
2) When the power is on or stand by, make sure that the STROBE signal is in invalid
state.
3) Make sure if program is abnormal (such as system halted), VH voltage should be
shut off automatically.
4) During the printing, Detecting thermistor temperature, make sure that the
thermal printer head (TPH) is not overheated.
In firmware terms:
1) STROBE time should not be too long.
2) In the following two cases, do not start:
①when paper jammed; ②When the paper is out.
3) When the power is on or each printing task completed, it is recommended to
send blank data to the mechanism, so it can prevent the printer head from
damaged if there are some hardware failure on the control board.
4) Over-temperature protection:The printer stops working when heating
temperature is greater than 75℃,and start working again when the temperature
down to 60℃.
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2.5 Pin assignment
Pin No.
Signal Name
Function
1
PS
Optical coupling signal output
2
GPS
Optical coupling grounding
3
VPS
Optical coupling power
4
VP
Printing power supply
5
VP
Printing power supply
6
VP
Printing power supply
7
DI
Printing data in
8
CLK
Printing clock inpit
9
GND
Ground power supply for thermal head
10
GND
Ground power supply for thermal head
11
GND
Thermally sensitive resistor input terminal
12
VDD
Logic power
13
DST
Heating allowed control pin
14
TH
Thermistor
15
GND
Ground power supply for thermal head
16
GND
Ground power supply for thermal head
17
GND
Asynchronous clock for communication
18
LAT
Data Latching control
19
VP
Printing power
20
VP
Printing power
21
PA
Step motor wending 1 Pin1
22
/PA
Step motor wending 1 Pin2
23
PB
Step motor wending 2 Pin1
24
/PB
Step motor wending 2 Pin2
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