Seiko LTP1245R-C384-E - Head Resistance; Head Voltage; Peak Current

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3.5.3 Head Resistance
The LTP1245 head resistance is176 Ω ± 4 %.
3.5.4 Head Voltage
The LTP1245 has a built-in head driver IC and control IC. Table 3-7 shows the head voltage.
Table 3-7 Head Voltage
Item Voltage Range
Head drive voltage Vp
4.2 to 8.5 V
Head logic voltage Vdd
4.5 to 5.5 V
3.5.5 Peak Current
Since the peak current (maximum current) may reach the values calculated using equation (2) when the
thermal head is driven, make sure that the allowable current for the cable material and the voltage drop on
the cables are well within the specified range.
Equation (2):
Ip: Peak current (A)
N: Number of dots that are driven at the same time
Vp: Head drive voltage (V)
RH: Head resistance (Ω)
N
×
V
p
Ip= 
RH