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'OT: RC Encoder Chips Anyone?'
1998\08\23@161719 by Lewis H. Cobb

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Hi all - I'm trying to figure out what encoder chip has been used in a
radio remote control device I have gotten my hands on.  The numbers have
been filed off - apparently to disuade commercial lads from trying to copy
it, however I have a "home brew" project on the go so I doubt I fall into
this category....  Anyway, I can say the following about the chip:

18 Pin DIP - thru hole package
Pins 1-8 are connected to a dip switch
there are 4 other pins that appear to be the four "buttons" on the front panel
Pin 17 is the data out pin
Pin 18 is Vcc
Pin 14 is gnd
Pin 15 and 16 are no connect ( I think ) - this ruled out a Holtek device
There is a precision resistor and cap that is connected to the thing -
apparently for the time base of the clocking.

I can root a bit more on the circuit board if someone thinks they may know
what device it is...


Any ideas anyone?


Thanks for any help people can provide.

Lew

1998\08\23@223825 by Alan King

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Been a long time since I looked at one, but try finding
info on an "ED9" series..  (actually it is ED-series, there
are other numbers)  Can't tell if that is the right pinout
off the top of my head, but similar pins/features.  Real
common in alarm systems..  Thing is, if I was a company of
any size ordering a lot of chips, time to order common chip
for easy supply, but with custom pinout.  With long lead
times I seem to recall it wasn't much more expensive than
standard.  Heck they ended up getting a semi-custom version
of the chip with only the features they wanted.  (I used to
work at an alarm manufacturer if you couldn't guess..)



Lewis H. Cobb wrote:
{Quote hidden}

1998\08\24@170308 by cousens

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Lewis H. Cobb wrote:

> 18 Pin DIP - thru hole package
> Pins 1-8 are connected to a dip switch
> there are 4 other pins that appear to be the four "buttons" on the front panel
> Pin 17 is the data out pin
> Pin 18 is Vcc
> Pin 14 is gnd
> Pin 15 and 16 are no connect ( I think ) - this ruled out a Holtek device
> There is a precision resistor and cap that is connected to the thing -
> apparently for the time base of the clocking.
>
> I can root a bit more on the circuit board if someone thinks they may know
> what device it is...
>
> Any ideas anyone?

UM86409 probably I don't have a data sheet but a couple of remote
controls
using this chip

15 and 18 = vcc, 14 and 16 = ground, 17 = output
1-10 dip to the switches on my two units

--
Peter Cousens
email: spam_OUTcousensTakeThisOuTspamher.forthnet.gr  phone: + 3081 380534
snailmail:  Folia, Agia Fotini, Karteros, Heraklion  Crete, Greece.

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