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LTPH245 数据表(PDF) 43 Page - Seiko Instruments Inc |
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LTPH245 数据表(HTML) 43 Page - Seiko Instruments Inc |
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43 / 64 page  3-30 3.8 PLATEN POSITION SENSOR The printer has a platen position sensor to detect whether or not the platen block is set. The platen position sensor is a switch type sensor shown in Figure 3-13. The platen position sensor switch is closed when the platen block is set and is open when the platen block is released. Design the control circuit so that the motor is not driven and the thermal head is not activated when the platen block is open by detecting output of the platen position sensor. 3.8.1 General Specification Maximum rating: DC30V, 0.5A Connection resistance: 200 m Ω or less 3.8.2 Sample External Circuit Figure 3-13 Sample External Circuit of the Platen Position Sensor • Note that there is a time lag between operation of the platen position sensor and completion of pressurization to thermal head. • To prevent a malfunction due to chattering of the switch, be sure to use the capacitor shown in Figure 3-13. Switch GND CPU Port Vdd (5v) R=100k Ω HS GND C=0.1 µF * When the platen block is open LTPH245 |
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