CW Technology - Allegro 5804 3 Axis Controller
Tech notes & Reference
This is the how_to file for the 3-Axis Stepper Controller. Refer to the schematic and parts placement for connections to the PC parallel port. While designed to be controlled from a PC, the controller can easily be controlled from a microcontroller or even logic circuitry. All control inputs are TTL compatible. Refer to placement diagram for power connections. When looking at the numbers on the parts overlay, the control connections are as follows:
10 - limit and pause switch: this connection, specifically for PC connections, is used to monitor normally closed (N.C.) limit switches. When one of these switches, connected in series, opens, it generates an interrupt in the PC that can be used to stop the motors.
IF YOU CHOOSE NOT TO USE LIMIT SWITCHES THIS INPUT MAY HAVE TO BE SHORTED SO IT DOESN'T SEE AN "OPEN SWITCH".
2, 3, 4 - x-, y-, and z-axis step inputs, respectively.
6, 7, 8 - x-, y-, and z-axis direction inputs, respectively. Direction polarity depends on the motor connections. (to switch direction polarity, simply reverse the motor connections end-for-end)
13, 12, 11 - these PC connections are used to bring the controlled machinery (i.e. X-Y table) to a "home" position. Normally open (N.O.) switches are used here.
Parts List for
3-Axis Stepper Controller 
(1) PC Board: CW Technology AX3UP-PCB ($18) or make.
(3) U1-3 UCN5804B Stepper Controller IC: CW Technology ($7) or Pure Unobtanium
(12) D1-12 200V/1A Fast Recovery Rectifiers: Digi-Key 1N4935CT-ND
(1) VR1 7805 5V Regulator: various
(4) R1-4 4.7K ohm, 1/4W resistors: various
(2) C2,3 0.01 uF, 63V Monolithic capacitor: Digi-Key P4914-ND
(1) C1 10uF, 25V Miniature Electrolytic: Digi-Key P813
(3) Slide-on sink for U2: Digi-Key HS125-ND
(3) RP1-3 Resistor Network: Digi-Key 770-81-R-4.7K
(14) 2-pos. Terminal blocks (optional): Digi-Key ED-1601-ND
(1) Parallel port cable: various
CW Technology
7328 Timbercreek
Ct Reynoldsburg, OH 43068-1181
800-547-7479
cwtech@infinet.com
Digi-Key
701 Brooks Ave
Thief River Falls, MN 56701
1-800-344-4539
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