C11- MULTIFUNCTION CNC BOARD Rev. 9.3 - Stepper Motor ...

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C11 (Rev. 9.3) User Manual3. Specifications.DIGITAL INPUT SPECIFICATIONSNumbers of inputs 5On-state voltage range2 to 5V DCMaximum off-state voltaje 0.8VTypical signal delay2.8uSDIGITAL OUTPUT SPECIFICATIONSNumber of outputs 12Maximum output voltage (5V power supply voltage) + 0.5VTypical output current24mAMaximum off-state voltaje0.44 VTypical signal delay3uSTime of transition to high impedance state120mS*Time passed since a fault in the SCHP signal is detected and the outputs are disabled.The recommended pulse width for the inputs and outputs is 2us.Revision: 01/27/2010 http://cnc4pc.com/TechDocs/C11R9_3_User_Manual.pdf 4/22
C11 (Rev. 9.3) User Manual4. Functional Block Diagrams4.1 Outputs 2-9 simplified functional block diagramFig. 1 Simplified functional block diagram for the outputs 2-9.Parallel Port coupling is done following IEEE 1284 standard recommendation.An RC Low Pass filter followed by a Schmitt Trigger gate is used to help reducethe effect of the noise from drivers or other devices. LEDs are driven by a differentbuffer to avoid residual currents affecting the signal.4.2 Outputs 1, 14, 16 and 17 simplified functional block diagramFig. 2 Simplified functional block diagram for the outputs 1, 14, 16 and 17.Note: “Internal Enable” = “External Enable Pin” AND (“SCHP” OR “Bypassed SCHP”)Revision: 01/27/2010 http://cnc4pc.com/TechDocs/C11R9_3_User_Manual.pdf 5/22
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C11- MULTIFUNCTION CNC BOARD Rev. 9.3 - Stepper Motor ...

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