What is a C49-6784?
 

I bought a numeric keypad from a used electronics shop to use in a
project. It comes with a din connector. I opened it and 2 wires from
the din connector are going into this chip as well as all other keys.

Its a 44-lead plcc

It says T i 80 (in logo format, cant recognize)
C49-6784
9219EEI (or L or | instead of the last I)

And cant find anything on it on google etc. Im hoping the din connector
just talks serial, but the keys will need to be powered. The base
voltage on the wires must be high to power the chip. There is a 10uF
capacitor between the two wires before they power the chip, maybe its
the way to maintain power with the serial transmission.

Anyway to find out what this chip is?

On 1 Oct 2005 21:21:53 -0700, "Ghazan Haider"
put finger to keyboard and composed:

I bought a numeric keypad from a used electronics shop to use in a
project. It comes with a din connector. I opened it and 2 wires from
the din connector are going into this chip as well as all other keys.

Its a 44-lead plcc

It says T i 80 (in logo format, cant recognize)
C49-6784

An 80C49 is an 8-bit mask ROMmed microcontroller. The "6784" refers to
the ROM code. The logo belongs to Texas Instruments. This is a
preprogrammed chip whose function is determined by the OEM.

9219EEI (or L or | instead of the last I)

9219 = YYWW date code, ie week 19 of 1992.

-- Franc Zabkar

Please remove one 'i' from my address when replying by email.