Datasheet help: ELM1157AE

beenthere

Joined Apr 20, 2004
15,819
Going to the Everlight site failed to turn up that part number. It may be obsolete. It should be a single 7 segment display.
 

beenthere

Joined Apr 20, 2004
15,819
That is odd - the 7 segment display identification comes from the datasheet archive web site. If you have a voltage source, you can figure out the internal connections. For 6 volts, use a 470 ohm resistor to limit current (1200 ohms for 12 volts). You have to guess as to which pin is the common anode or cathode, but you should be able to get all the dots to light and make a diagram of which pin is connected to which LED's.
 

Thread Starter

Aklem

Joined Jun 18, 2009
41
i dont think its common cathode or anode because there is only 14 pins and 5*7 = 35
i know there could be some polarity multiplexing or something else but it would be way easier to just find the datasheet
 

rjenkins

Joined Nov 6, 2005
1,013
One set of pins will be common across each row of LEDs, another set common along each column of LEDS.

When you put power between a row pin and a column pin (with a limiting resistor), the LED at that intersection will light.

Once you find any two pins that light a LED, you should very quickly be able to move along the pins and find which set selects the rows and which set selects the columns.
 

Thread Starter

Aklem

Joined Jun 18, 2009
41
One set of pins will be common across each row of LEDs, another set common along each column of LEDS.

When you put power between a row pin and a column pin (with a limiting resistor), the LED at that intersection will light.

Once you find any two pins that light a LED, you should very quickly be able to move along the pins and find which set selects the rows and which set selects the columns.
yep ill do that but notice that 14 pins and 12 rows and collums (5 + 7) so what are the other pins?
 
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