3-21
3.4.4 Timing
Chart
Figure 3-10 shows a thermal head drive timing chart.
1/f
CLK
t1
t2
t3
t4
t5
t7
CLK
DI
LAT
DST
t6
t8
Figure 3-10 Thermal Head Drive Timing Chart
3.4.5 Thermal Head Heat Element Resistance
Table 3-12 shows resistance of the thermal head heat element of the printer.
Table 3-12 Thermal Head Heat Element Resistance
Thermal Head Heat Element Resistance
LTPD245D LTPD345D
166.0 to 180.0
Ω
168.9 to 183.1
Ω
3.4.6 Maximum
Current
Consumption
Since the maximum current consumption may reach the values calculated using equation (2) when the
thermal head is driven, the number of simultaneously activated dots should be determined not to exceed
power supply capacity. Also, allowable current for the cable material and the voltage drop on the cable
should be cared well.
Equation (2):
min
H
P
SA
P
R
V
×
N
=
I
I
P
:
Maximum current consumption (A)
N
SA
:
Number of simultaneously activated dots (logical block)
V
P
:
Thermal head drive voltage (V)
R
H min
:
Minimum thermal head heat element resistance
166.0
(
Ω
) (LTPD245D)
168.9
(
Ω
) (LTPD345D)
