5 Feb
2012
5 Feb
'12
2:05 p.m.
On 4 Feb 2012 at 20:17, Tony Duell wrote:
You are now giving me additional facts, from which I agree that the
unknown IC is not a TTL device. But your original somment that the board
used -5V and -15V power lines does not IMHO preclude the use of TTL on it.
I've not seen the board but I don;t think I
can say from what you've
told us that there can't be any TTL on the board.
-15V is present on both ICs. There's nothing else on the main board
in the way of ICs. The capacitive touch panel and clock are on a
separate PCB--I haven't taken that assembly apart yet. Pin 1 of the
TMS1000 connects to pin 6 of the mystery IC. Otherwise there are no
direct connects between the two.
The -5V goes to 2 headers for connection to the display/touch panel.
Although I haven't disassembled that assembly, I suspect that it's
used for the LEDs and clock displays. Perhaps some TTL is on that
board. But the -5 connects to no other component on the MCU board.
Doesn't sound like TTL to me.
Agreed. Doesn't sound like any common display driver chip either.
-tony