3.8 Thermal Head Drive/ Protection and History Control Circuit
Fig. 3.9 Thermal Head Drive/ Protection and History Control Circuit
This is the thermal head drive circuit. CLK and /LAT connected to thermal head control clock
and data latch respectively. TPH_EN controls the DC24V voltage of the thermal head.
When TPH_EN is “LOW”, the thermal head will be separated from 24V (VMM). STB1-STB4
determines whether to heat the thermal head or not. DI sends the printer data to the print
head. TM is the temperature for thermal head. Vdet feeds back the voltage and
compensates the heat time for voltage accuracy when printing.
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