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Registered Member #902
Joined: Sun Jul 15 2007, 08:17PM
Location: North Texas
Posts: 1040
ok, so at my local electronics surplus store they got in stock some of these control panels made for a payment system on buses... they have a lot of buttons, a VFD Display, a serial port connection, and apparently an 8 Bit Microcontroller... Now, I want to know what might be the best way to program and debug this particular controller, which I am not familiar with (and I preferably do not want to re-wire everything to an Arduino or other PIC/AVR, which I have several of not being used at the moment) the number is "SC87C51CCA44" or 80C51 for short... it is in the square package, in one of those SMD sockets so that they are easier to maintain...
these are the other chips on the board that might make a difference...
74HC04 (Shift Register?) MAX233CPP MAX707 03AL8EK
I want to use this control panel as the controller for my Pulse Bank Project... control charging (including desired power, rate, voltage, etc), the ability to control a secondary bank (either synced firing or independently controlled manually), check status, etc... I also would like to be able to use this unit as a general controller for my Advanced Projects, such as a SSTC with Audio, multiple high voltage sources for demonstrations, multiple model rockets complex circuits such as faux Rube-Goldberg like machines, and a CNC Machine...
Essentially the Reason I want to use these panels for so many things are the following: have access to multiples; nice construction; simple layout, serial connection, roomy casing, mostly empty, lots of buttons, a microcontroller, metal design, and the fact that so far I have never been able to really build a universal controller for my projects, all of which have safety interlocks; many need timing, code, or complete manual control; and pack in a display... at least, I have not been able to do this cheaply, these things are $9.95!
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
The datasheet says "Plastic Leaded Chip Carrier, OTP", OTP means one time programmable. So you will not be able to reuse that chip.
You have to replace it with one with a ceramic package with a window so you can erase it with UV light or even better with a modern FLASH based version.
Registered Member #902
Joined: Sun Jul 15 2007, 08:17PM
Location: North Texas
Posts: 1040
Bjørn wrote ...
The datasheet says "Plastic Leaded Chip Carrier, OTP", OTP means one time programmable. So you will not be able to reuse that chip.
You have to replace it with one with a ceramic package with a window so you can erase it with UV light or even better with a modern FLASH based version.
well then... needs to be replaced, can you think of anything that might have a similar layout? I could run key wires to a new socket, but prefer not to... though I would not be surprised at all to get a "no" to the above question...
I simply might use an Arduino, as I have several Atmega168s lying around, and some custom PCBs for them (they were designed for the Dual Core Arduino from their forums... uses two Atmega168s with a shared resonator, communicating via I2C... might be better in my case to just use that, then I have to ability to uto expand my capabilities in terms of I/O, and programming by using that...)
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
Google says that Philips and probably others have FLASH based chips with the same layout, for example P89C60X2BA.
You have to compare the datasheets to find out if there are some changes that will cause problems if you drop it straight into your circuit. Newer models often have different instruction timings that may cause problems.
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Bus Fee Control Panel - Reprogramming...
