AW: Matrix board! (a CMOS one)

[Edu Silva]

De: Haible Juergen <Juergen.Haible at nbgm.siemens.de>
 
> Does it provide mixing of several inputs to one output ?
> (If not, it cannot replace an EMS style matrix.)

I think so. The datasheet isn't very clear at it. That's what it says:

"The Master Reset has an internal pull-up resistor and is normally used
with
a 0.1mF capacitor. During power up all switches are automatically reset.
The crosspoint switches will reset with MR = 0 even if CE is high. A 6-bit
address through a 6 line to 64 line decoder selects the transmission gate
which can be turned on by applying a logical ONE to the DATA input and
logical ZERO to the STROBE. Similarly, any transmission gate can be turned
OFF by applying a logical ZERO to the DATA input while strobing the STROBE
with a logical ZERO. The CE pin allows the crosspoint array to be cascaded
for matrix expansion in both the X and Y directions."

According to the statement "during power up, all switches are automatically
reset", I assume that it can turn on more than one switch at a time. The
truth table doesn't helps. The sheet from another matrix from Harris, the
CD22100 (4x4) is much more clear and says: "Any number of the transmission
gates can be ON simultaneously."   It would be a great pity if the 8x8 big
brother can't do the same...

I really would like to use it (or something like) as the basis for a
uP-controlled modular.

Edu

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ES2 Audio - Som & Luz
Salvador-Bahia-Brasil