ROHM KD2008

Compact medium speed thick film thermal printhead(8dots / mm)
KD2008-CG50A
KD2008-CG50A is suitable for devices,such as high-speed POS and label printer applications, that require thermal
printheads capable of higher printing rates. Improved power circuit design means that with heavier current it is possible
to print at speeds as high as 125 mm/s. The GK Series is the thus ideal for label printers that need high printing rates.
Applications
POS terminal printers
Label printers
CAT printers
General purpose compact printers
Features
1) Using a special compact partial glaze and new heating element structure, achieves high-speed printing at 125 mm/s.
2) The use of the newly developed highly-durable conductive protective film has improved countermeasures against
static electricity.
3) The VH and GND sections of the power circuitry have been strengthened so that heavier current can be applied.
4) Ultra small connectors, designed to conform with FFCs, and miniature driver chips have been used.
Although the resulting printheads are surprisingly compact and lightweight, they can be used with large platens of up
to 20 mm in diameter.
5) One rank resistance value of 8003% eliminates the inconvenience of rank selection.
Dimensions (Units : mm)
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2010.02 - Rev.A
KD2008-CG50A
Data Sheet
Inner circuit
144 OUTPUTS EACH
DOT #1728
VH
DOT #1
GND
12
11
10
9
8
7
6
5
4
3
2
1
STB4
STB3
STB2
STB1
LAT
CLK
DI1
DO1
DI2
DO2
LATCH REGISTER
LATCH REGISTER
SHIFT REGISTER
SHIFT REGISTER
V DD
TM
THERMISTOR
30kΩ B:3950
TM
CONNECTOR
Fig. 1
Pin configuration
No.
Circuit
No.
Circuit
1
VH
15
GND
2
VH
16
GND
3
VH
17
GND
4
DO2
18
GND
5
DI2
19
TM
6
CLK
20
VDD
7
LAT
21
STB3
8
STB1
22
STB4
9
STB2
23
DO1
10
TM
24
DI1
11
GND
25
VH
12
GND
26
VH
13
GND
27
VH
14
GND
28
VH
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2010.02 - Rev.A
KD2008-CG50A
Data Sheet
Timing chart

tw CLK
CLOCK(CLK)
t setup DI
t hold DI
DATA IN(DI)
High : BLACK
Low : WHITE
td DO
DATA OUT(DO)
High : BLACK
Low : WHITE
t setup LAT
t hold LAT
LATCH(LAT)
High : HOLD
Low : THROUGH
tw LAT
t setup STB
STROBE(STB)
tdo
tdo
DRIVER OUT
Fig. 2






Characteristics
Parameter
Symbol
Typ.
Unit
Effective printing width
−
216
mm
Dot pitch
−
0.125
mm
Total dot number
−
1728
dots
Rave
800
Ω
VH
24
V
Average resistance value
Applied voltage
Applied power
PO
0.5
W / dot
Print cycle
SLT
1
ms
Pulse width
TON
0.4
ms
Maximum number of dots energized simultaneously
−
432
dots
Maximum clock frequency
−
5
MHz
Maximum roller diameter
−
20
Running life / pulse life
−
50 / 5×10
Operating temperature
−
5∼45
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mm
7
km / pulses
°C
2010.02 - Rev.A
KD2008-CG50A
Data Sheet
Electrical characteristic curves
0.8
1.8
0.45
Paper : KF50-HDA (OJI)
0.4
1.4
0.5
0.4
0.3
0.35
ENERGY (mJ/dot)
OPTICAL DENSITY
0.6
ENERGY (mJ/dot)
SLT : 1.00ms/line
1.6
0.7
1.2
1.0
0.8
0.6
0.3
0.25
0.2
0.15
0.2
0.4
0.1
0.1
0.2
0.05
0
0
1
2
3
4
5
0.0
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0
0
0.5
1
1.5
2
2.5 2.7
SCANNING LINE TIME (ms/line)
SCANNING LINE TIME (ms/line)
ENERGY (mJ/dot)
Fig.3 Adaptive speed chart
Fig.4 Representative density curve
Fig.5 Maximum energy curve
180
160
RESISTANCE : (kΩ)
140
120
100
80
60
40
20
0
20
10
0
10
20
30
40
50
60
70
TEMPERATURE : (°C)
Fig.6 Thermistor curve
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2010.02 - Rev.A
Notice
Notes
No copying or reproduction of this document, in part or in whole, is permitted without the
consent of ROHM Co.,Ltd.
The content specified herein is subject to change for improvement without notice.
The content specified herein is for the purpose of introducing ROHM's products (hereinafter
"Products"). If you wish to use any such Product, please be sure to refer to the specifications,
which can be obtained from ROHM upon request.
Examples of application circuits, circuit constants and any other information contained herein
illustrate the standard usage and operations of the Products. The peripheral conditions must
be taken into account when designing circuits for mass production.
Great care was taken in ensuring the accuracy of the information specified in this document.
However, should you incur any damage arising from any inaccuracy or misprint of such
information, ROHM shall bear no responsibility for such damage.
The technical information specified herein is intended only to show the typical functions of and
examples of application circuits for the Products. ROHM does not grant you, explicitly or
implicitly, any license to use or exercise intellectual property or other rights held by ROHM and
other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the
use of such technical information.
The Products specified in this document are intended to be used with general-use electronic
equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices).
The Products specified in this document are not designed to be radiation tolerant.
While ROHM always makes efforts to enhance the quality and reliability of its Products, a
Product may fail or malfunction for a variety of reasons.
Please be sure to implement in your equipment using the Products safety measures to guard
against the possibility of physical injury, fire or any other damage caused in the event of the
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The Products are not designed or manufactured to be used with any equipment, device or
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R1010A