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Automated Fixture Electronics

Background of Product. High Volume (1M-2M a year) Next Generation product in panel of 24Board level functional and ICT done at the same timeReduce time at product level functional test. What needed to be done. Switch in 3 resistors for each board positionnot enough GP relays to do this withEach

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Automated Fixture Electronics

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    1. Automated Fixture Electronics Adding Fixture Electronic Boards into the board and board_xy By Thomas Garrison

    2. Background of Product High Volume (1M-2M a year) Next Generation product in panel of 24 Board level functional and ICT done at the same time Reduce time at product level functional test

    3. What needed to be done Switch in 3 resistors for each board position not enough GP relays to do this with Each board to have one power supply muxed in Also to have a series resistor Keep test time, complexity, and maintenance low Replacement easy and fast and done by anyone

    4. Design Steps Decided to use analog switches as control element Smaller footprint than relays, shorting blocks Might be able to use a small kit Number of devices needed reduced 18 Quad Switches vs 36 Dual relays Decided to use analog switches and design board using ExpressPCB (http://www.expresspcb.com/) Boards can be built be our internal house

    5. What has to be part of the design 18 Quad analog switches (max365) 9 per module 96 Resistors 48 49 resistors 24 10k resistors 24 120 resistors for power supplies ~152 wires had to be connected

    6. Internal vs. External External Have to protect the circuitry Probe points automatically generated for easier wiring Good contact has to be maintained for each actuation Internal Everything away from prying eyes Wiring more difficult with a ribbon cable Have to remove interface plate to change or maintain

    7. Design with ExpressPCB 35 mil square test pads on bottom of the board spaced at least 100 mil apart .125 diameter tooling holes SOIC16 chips for the switches 1812 and 0603 chip resistors Power supply resistors ½ watt through hole Added extra breakaways for custom PCB for the 24 load resistors for the power supplies (boards placed internally) Recorded X,Y locations of tooling locations and test pads in Excel file

    8. Final Layout of PCB Board

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