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Asymtek dispensing system uses CAN bus architecture

Posted: 12 Feb 2002 ?? ?Print Version ?Bookmark and Share

Keywords:asymtek? pcb production machine? component packing machine? pcb assembly? semiconductor packaging?

The Axiom X-1020 mid-range inline dispensing system for semiconductor package and PCB assembly uses a CAN bus that enables it to introduce the Dynamic Dispensing Control (DDC) for the dispense head through closed-loop servo technology.

This control system allows users to control the actual position of the dispense pump motor with improved precision in the dispensing of dots and line. Position control is done by linear encoders mounted on the cable drive for the X- and Y-axes.

The X-1020 system is suitable for applications such as flip chip and CSP underfill, dam and fill, solder paste and thermal compounds.

The CAN bus is a serial bus architecture of distributed processors, one of which is mounted directly on the dispense head and controls the valve, needle heater, height sensor, lighting and associated I/O.

A second controller manages all of the conveyor-related functions including the width and belt motors, substrate heaters, all conveyor sensors and pneumatic actuators, as well as the SMEMA interface. The main controller hosts the OS and the company's Fluidmove for Windows NT (FmNT) application software.

The X-1020 also integrates a calibration module that condenses the tactile needle sensor, vacuum purge station and mass flow sensor. A new vision system has a field of view of 12.5mm and uses a lighting system with both red and blue LEDs that can be independently set for 255 light levels.

The height sensor has been reconfigured to allow a second valve to be positioned closer to the camera and valve.

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