Specifications

3-17

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)

Ip= 