FTP-639MCL354 SPECIFICATION
A1NA02273-0354
Dept. to
control the original document
Date
Date
Rev.
Design
Design
Inspection
Inspect.
Changes made
Approv.
FUJITSU COMPONENT LIMITED
Name
Drawing
No.
Page
Submit to
15 26
Ｔｏｎ＝Ｅｏ÷Ｐｏ
or
Ｐｏ ＝Ｅｏ÷Ｔｏｎ
ＶＨ ＝√（Ｐｏ÷Ｒａｖ）×（
Rcom
×Ｎ＋
Rav
＋
Ric
＋
Rlead
）
Rav:
Average resistance value
(example)
800
［Ω］
N:
The number of simultaneous printing dot
(example)
144
［
dot
］
Rcom:
Common resistance
0.05
［Ω］
Ric:
Driver-On resistance
50
［Ω］
Rlead:
Lead resistance
14
［Ω］
(5) Thermistor characteristics
B constant:
3950K±2%
Resistance value R25:
30K
Ω±
5% at25
℃
Thermistor calculation formula: RX=R25×EXP{B×(1/TX-1/T25)} T: Absolute temperature
Operating temp. range:
-20
〜
+80
℃
Thermal time constant :
Within 30sec (in the air)
(6) Cautions on operation
①
When performing the continuous printing with high printing rate, regulate the head base
(thermistor) temperature so that it does not exceed the standard value.
②
For the waiting time, control (circuit design) the printer so that VH (power supply of the
heating element) is turned off (the GND level) in order to prevent thermal head damages
caused by ions and noises.
③
When the thermistor is disconnected, control (circuit design) the printer so that the thermal
head is not overheated.
④
Do not input any pulse noise of equal or more than 2V, 20ns in each signal terminal.
⑤
Control signals of CLK, LAT, DIN, and STB with C-MOS (equivalent to 74HC240). In
addition, when the power supply is on/off and for the non-printing time, maintain the STB
signal in the "DISABLE" state.
⑥
Surge noise to prevent , the cable length of VH and GND shall be equal or shorter
than 100mm. Mount an aluminum electrolytic capacitor of 47
μ
F between VH and GND
of the head side, which should be as close to the head side as possible. In addition, mount a
0
20
40
60
80
100
120
140
160
180
200
-20
-10
0
10
20
30
40
50
60
70
80
Temperature ［℃］
Resistance value ＫΩ
Summary of Contents for FTP-639MCL354
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